Calculate the change in potential energy of 8,000,000 kg of water dropping 50.0 m over Niagara Falls

Answers

Answer 1
Potential energy=mgh
m - mass (8 min kg)
g - 9.8 m/s-2 or just 10
h - height (50m)

= 8 000 000 * 10 * 50 = 4 *[tex] 10^{9} [/tex] j

Related Questions

when light waves passes straight through an object, it is called?

Answers

When light waves passes straight through an object, it is called transmission.
Answer;

Transmission

Explanation;Light waves are types of waves that are electromagnetic waves, meaning they do not require material medium for transmission. Light is transmitted as a transverse wave such that the vibration of particles is perpendicular to the direction of wave motion.A material medium enables the transmission of a wave by the vibration of particles, atoms or molecules. The vibration of particles in a medium helps in the transmission of a wave such that energy is transferred from one point to another due to the disturbance caused by the wave.

If this were a theoretical frictionless plane, what would be the mechanical advantage?
H + 9H = 10H
H ÷ 9H = 1 ÷ 9
9H ÷ H = 9 ...?

Answers

mechanical advantage (MA = slope/height)
here length of slope = 9Hheight = H                                                 so mechanical advantage = ---- 9H/H= 9                                                  

Answer:

B, h=9

Explanation:

If you are given distance and a period of time what can you calculate

Answers

speed

i took the test just know and put velocity and it was wrong. it said the answer was speed

Given distance and a period, we can calculate speed, angular velocity, frequency, and even time dilation effects. Speed is calculated using the formula v = d/t.

If you are given distance and a period, you can calculate several interesting physics concepts. One fundamental calculation would be speed or velocity since speed equals distance divided by time (v = d/t). If the movement occurs at a constant speed, this is straightforward. However, suppose the speed varies or involves a pendulum or circular motion. In that case, you can dive into more specific calculations such as angular velocity, frequency, and time dilation effects in relativity for movements approaching the speed of light.

For example, the period T of an object moving back and forth with a constant speed v over a distance 2L, such as a pendulum, can be calculated using T = 2L/v. Similarly, the frequency, f, of such an oscillating system is found using f = 1/T. These concepts apply to various systems, including satellites orbiting a planet where the period is related to the orbital distance from the center of the celestial body.

A metal sphere with a mass of 80.0g rolls along frictionless surface at 20.0m/s and strikes a stationary sphere having a mass of 200.0g. The First sphere stops completely. At what speed does the second sphere move away from the point of impact
...?

Answers

Answer:

8.0 m/s

Explanation:

By the law of conservation of momentum, the total momentum before the collision must be equal to the total momentum after the collision:

[tex]p_i=p_f[/tex]

The total momentum before the collision is given only by the momentum of the first sphere, since the second sphere is stationary (so its speed is zero and its momentum is zero as well):

[tex]p_i = m_1 u_1 =(80.0 g)(20.0 m/s)=1600 g m/s[/tex]

The total momentum after the collision is given only by the momentum of the second sphere, since the first sphere completely stops, so:

[tex]p_f = m_2 v_2[/tex]

Using conservation of momentum, we find

[tex]p_i=m_2 v_2\\1600 g m/s = (200.0 g) v_2 \\v_2 = \frac{1600 g m/s}{200.0 g}=8.0 m/s[/tex]

The second sphere moves away with a speed of 8 m/s after the collision, derived using the principle of conservation of momentum

To determine the speed of the second sphere after the collision, we need to use the principle of conservation of momentum. According to this principle, the total momentum before the collision is equal to the total momentum after the collision.

Given:

Mass of the first sphere (m1) = 80.0 g = 0.080 kgVelocity of the first sphere before collision (v1) = 20.0 m/sMass of the second sphere (m2) = 200.0 g = 0.200 kgVelocity of the second sphere before collision (v2) = 0 m/s

After the collision, the first sphere stops completely. Therefore, its final velocity (v'1) is 0 m/s.

The total momentum before the collision:

pinitial = m1 * v1 + m2 * v2 pinitial = 0.080 kg * 20.0 m/s + 0.200 kg * 0 m/s pinitial = 1.6 kg·m/s

After the collision, let the velocity of the second sphere be v'2.

The total momentum after the collision:

pfinal = m1 * v'1 + m2 * v'2 pfinal = 0.080 kg * 0 m/s + 0.200 kg * v'2 pfinal = 0.200 kg * v'2

Since momentum is conserved, pinitial = pfinal:

1.6 kg·m/s = 0.200 kg * v'2Solving for v'2:v'2 = 1.6 kg·m/s / 0.200 kg = 8 m/s

Thus, after the collision, the second sphere moves away with a speed of 8 m/s.

What is the volume of a gold nugget that weight 2.20kg. the density of gold is 19g/cm^3 ...?

Answers

2.2 kg is first to be converted into grams because the density is given in grams per cubic centimeter(or we could convert the density into kg per cubic centimeter)
2.2 kg = 2200 grams

Volume = mass/density
Volume = 2200/19
= 115.8 cm³

which radiation has a higher frequency than visible light

Answers

Infrared radiation lies between the visible and microwave portions of the electromagnetic spectrum. Infrared waves have wavelengths longer than visible and shorter than microwaves, and have frequencies which are lower than visible and higher than microwaves.

Answer:

Ultraviolet radiation  

Explanation:

Apex

A protostar forms when a ________ collapses under the force of gravity.
A. white dwarf
B. black dwarf
C. nebula
D. supernova ...?

Answers

a protostar forms when a  NEBULA collapses under the force of gravity.

After the collapse, the young star will gather molecular cloud from its parents , which could take millions of years

hope this helps

Answer:

C .Nebula

Explanation:

Protostar is an early stage in the formation of a star. Main sequence star is formed after the protostar heats up to almost 10 million kelvin temperature.

The interstellar medium fills the entire space, which appears to be seemingly empty. It is comprised of gas and dust. Hydrogen is the most abundant element in this medium, which is spread across and fills the space.

Under the influence of gravity, pressure and temperature, these clouds of gas and dust come together forming nebula. Hydrogen and helium in this nebula, under high temperature  conditions form protostars.

if samples of silver and lead each had volumes to 1 cm^3 which sample would have the greater mass and what would the difference in the mass be

Answers

Lead would have greater mass than silver coz density of lead is higher 
density of lead is 11.3, silver is 10.49
so it would be 11.4/10.49 = 1.08
means that lead it would have 1.08 times mass of silver
to be exact 1 cubic cm of silver would have mass 10.49 gr and lead cube would have mass 11.4 gr

Chandra notices that her bicycle tires have a higher pressure during the hot summer than during the cold winter. Which gas law explains her observation? Explain your answer.

Answers

The Gay-Lussac law can explain this.
P/T = K
P = the pressure of the gas
T = the temperature of the gas
K = constant.

that means that if the temperature is higher in summer, the pressure should also be higher in order to not change K (it's a constant)

same applies for if it's colder. if you lower the temperature, the pressure of the gas has to become smaller too in order to keep K a constant.

hope this helps you

The Gay-Lussac law can clarify this, which states that if the temperature rises in the summer, the pressure should rise as well in order for K to remain constant.

What is Gay-Lussac law?

Gay-law Lussac's is most commonly associated with Joseph-Louis Gay-law Lussac's of combining volumes of gases, which was discovered in 1808 and published in 1809.

It can also refer to the proportionality of a gas's volume to its absolute temperature at constant pressure.

The law is named after the French chemist who discovered the relationship between a gas's pressure and absolute temperature. Joseph gay lussac was his name.

The Gay-Lussac law, which states that if the temperature rises in the summer, the pressure must rise as well in order for K to remain constant, can help to clarify this.

Thus, the Gay-Lussac law can explain her observation.

For more details regarding Gay-Lussac law, visit:

https://brainly.com/question/11387781

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What type of pollution did the Clean Water Act succeed in limiting?

Answers

Sewage. If thats not it, then I need to see your choices. :)

sewage is the answer because it's what the water was filled with most

I solid iron ball of mass 770kg is used on a building site. The ball is suspended by a rope from a crane. The distance from the point of suspension to the centre of the mass of the ball is 12 m.The ball is pulled back from the vertical and then realeased, it falls through a vertical height of 1.6m and strikes the wall: What is the speed of the ball just before impact? ...?

Answers

Based on the given values above, here is the solution which I hope will be helpful to you. 
Triangles, L = 12m, x_0 = 1.6,
we need to find the angle (theta)
sin (theta) = 1.6/12 = 0.1333....
theta = ArcSin(0.1333...) = 0.1337 rad
 hen, this is the height that the mass vertically raises in it's arc
y_2 = L-L*cos(theta) = 0.107 m
use y_2 in a kinematic swing... v=√2gy^2 = 1.45m/s
The speed would be 1.45m/s. Hope this answer helps.

The speed of the ball just before impact is calculated using the conservation of energy principle, translating the potential energy into kinetic energy and solving for velocity to obtain 5.60 m/s.

The speed of the ball just before impact on the building site, we can make use of the principle of conservation of energy. Initially, when the ball is held at a height, it possesses potential energy. When released, this potential energy is converted into kinetic energy just before impact. Given the height it falls through, we can calculate its final speed using the equation for potential energy (PE) and kinetic energy (KE):

PE = KE at the point of release and just before impact,

mgh = ½ mv²,

where m is the mass of the ball, g is the acceleration due to gravity (approximately 9.81 m/s²), h is the height, and v is the final speed. After rearranging and solving for v, we get v = √(2gh).

Inserting the values: v = √(2 * 9.81 m/s² * 1.6 m) = √(31.392) = 5.60 m/s. Therefore, the speed of the ball just before impact is approximately 5.60 meters per second.

A 490 n (her weight due to gravity) woman is standing on bathroom scale. what is the woman's mass in kilograms

Answers

the answer is 49.9660944 kg. this rounds up to 50 kg 

if the velocity of a car is halved, the centripetal force required to keep it in path of constant radius is (multiplied,divided) by what ...?

Answers

Answer:

If the velocity of a car is halved, the centripetal force required to keep it in path of constant radius becomes one fourth of the initial force.

Explanation:

The centripetal force is required to move an object in circular path. Mathematically, the formula of the centripetal force is given by :

[tex]F=\dfrac{mv^2}{r}[/tex]

Here,

m is the mass of the object

v is the velocity of object

r is the radius of the circular path

If the velocity of the car is halved, v'=v/2

New centripetal force is given by :

[tex]F'=\dfrac{mv'^2}{r}[/tex]

[tex]F'=\dfrac{1}{4}\times \dfrac{mv^2}{r}\\\\F'=\dfrac{1}{4}\times F[/tex]

New centripetal force becomes one fourth of the initial force, when the velocity of a car is halved.

Final answer:

When the velocity of a car is halved, the centripetal force required to keep it in a path of constant radius is divided by four.

Explanation:

When the velocity of a car is halved, the centripetal force required to keep it in a path of constant radius is divided by four. This is because the centripetal force is directly proportional to the square of the velocity and inversely proportional to the radius of the circular path.

For example, let's say the original velocity of the car is v and the centripetal force required is F. When the velocity is halved to v/2, the centripetal force becomes (v/2)² = F/4.

Therefore, the centripetal force required to keep a car in a path of constant radius is divided by four when the velocity is halved.

What will happen to the gravitational force between stars as the universe continues to expand? ...?

Answers

The gravitational force between the galaxies is strong enough to prevent expansion. It is the space between super clusters of galaxies that is expanding. Long term it just means these get further apart.


I hope my answer has come to your help. Thank you for posting your question here in Brainly. We hope to answer more of your questions and inquiries soon. Have a nice day ahead!

Answer:

In a galaxy, the expansion of the universe actually does not have any effect, because the force of gravity is enough to kinda keep the celestial bodies in their orbits.

Now, the expansion can be seen between galaxies (according to the Hubble's law, the far away is the galaxy, the faster it seems to move away), so the forces between stars actually will not really change, and the forces that the stars are experiencing by bodies in other galaxies are almost depreciable, so nothing will happen.

a fisherman hooks a trout and reels in his line at speed of 4 inches/second. assume tip of fishing rod is 12 ft above the water directly above the fisherman and the fish is pulled horizontally directly towards the fisherman. Find the horizontal speed of the fish when it is 20 ft from the fisherman. ...?

Answers

 Let x be the distance of the fish to the fisherman and h be the height of the tip of fishing rod then we want to fiind dx/dt when x = 20. By property of similar triangle we have 12/x = h/20 --> h = 240/x 


Differentiating w.r.t. we obtain dh/dt = (-240/x^2)*dx/dt --> dx/dt = [(x^2)/240]*dh/dt 


At x = 20, dh/dt = 4 --> dx/dt = (-400/240)*4 = 20/3


I hope my answer has come to your help. Thank you for posting your question here in Brainly. We hope to answer more of your questions and inquiries soon. Have a nice day ahead!

Answer:

v = 4.66 inch/s

Explanation:

As we know that the height of the rod and the distance from the fisherman is related to each other as

[tex]x^2 + y^2 = L^2[/tex]

now differentiate it with respect to time

[tex]2x\frac{dx}{dt} + 0 = 2L\frac{dL}{dt}[/tex]

here we know that

[tex]\frac{dL}{dt} = 4 inch/s[/tex]

now when

x = 20 ft  and y = 12 ft then the length of the line is given as

[tex]L^2 = 12^2 + 20^2[/tex]

[tex]L = 23.3 ft[/tex]

now from above relation

[tex]\frac{dx}{dt} = \frac{L}{x}(\frac{dL}{dt})[/tex]

now we have

[tex]v_x = \frac{23.3}{20} (4 inch/s)[/tex]

[tex]v_x = 4.66 inch/s[/tex]

If the speed of a ball increased from 1m/s to 4m/s, by how much would kinetic energy increase

Answers

1 centemeter and 1 square inch

A roast turkey is taken from an oven when its temperature has reached 185°F and is placed on a table in a room where the temperature is 75°F. The graph shows how the temperature of the turkey decreases and eventually approaches room temperature. By measuring the slope of the tangent, estimate the rate of change of the temperature after an hour.

Answers

Final answer:

The student's question requires estimating the rate of change of the turkey's temperature after cooling for an hour, which is determined by the slope of the tangent on the temperature graph. This mathematical concept also has a real-life application in ensuring that turkey is cooked to a safe internal temperature of 165°F using a food thermometer.

Explanation:

The student's question involves calculating the rate of change of the turkey's temperature after allowing it to cool for an hour. To accomplish this, one would measure the slope of a tangent line drawn on the graph at the point corresponding to one hour post removal from the oven. The slope of the tangent represents the rate at which the turkey's temperature is changing at that specific time—essentially, how quickly it is approaching room temperature.

While this problem is primarily mathematical, it involves knowledge about cooking temperatures as context. This includes knowing the safe internal temperatures for various meats—a roast turkey should reach a safe minimum internal temperature of 165°F to ensure it is safe to consume. The mathematics involved in graphing and calculating slopes can help in ensuring that these safety standards are followed by providing precise information about how quickly the food is cooling and when it has reached a safe temperature.

When using a food thermometer to check for these safe temperatures, the concepts of rates of change are at work as the thermometer relays how quickly the internal temperature is reaching the desired heat level. This practical application shows the importance of mathematical concepts in everyday life.

The estimated rate of change of the temperature of the turkey after an hour is about -10°F per minute, indicating it is cooling down.

Understanding the Concept of Rate of Change:
The rate of change of temperature is represented by the slope of the tangent line on the graph at a specific time. In this case, after one hour, we can look at the graph to find the corresponding temperature and its change over a small time interval.

Finding the Slope at t = 1 hour:  

The slope of the tangent line at a point on a graph is calculated using the formula:
[tex]\text{slope} = \frac{\Delta y}{\Delta x}[/tex]
where [tex]\Delta y[/tex] is the change in temperature and [tex]\Delta x[/tex] is the change in time.

Locate the point on the graph that corresponds to 1 hour after placing the turkey on the table. Let's say the temperature at that point is roughly 150°F (you would need to confirm this from the actual graph).

Let's assume that right before the 1-hour mark (at approximately 59 minutes), the temperature was about 160°F.

Calculate the Change:  

Change in temperature:
[tex]\Delta y = y_1 - y_0 = 150 - 160 = -10 \text{ F}[/tex]  

Change in time:
[tex]\Delta x = 60 - 59 = 1 \text{ minute}[/tex]

Calculate the Slope:  

Now apply the values into the slope formula:
[tex]\text{slope} = \frac{\Delta y}{\Delta x} = \frac{-10 \, \text{F}}{1 \, \text{min}} = -10 \, \text{F/min}[/tex]

a car traveling at a speed of 13 meters per second accelerates uniformly to a speed of 25 meters per second in 5.0 seconds.
-a truck traveling at a constant speed covers the same total distance as the car in the same 5.0 second interval. Determine the speed of the truck.
-Calculate the magnitude of the accelerate of the car during this 5.0 second interval.

Answers

since car is accelerating uniformly that means we it is accelerating at constant rate if you can say that way. To find its acceleration all we have to do is find difference between v1=13 m/s and v2 = 25m/s   and divide it by interval that car is taking to accelerate.

a = (v2-v1)/t = 2,4m/s^2

since car is accelerating at constat rate and truck covers same distance as car needs to accelerate from 13 to 25m that means that we can say that in that period truck travelled at cars average speed.

Vtruck = (v1 + v2)/2 = 19m/s

Which of the following is a poor electrical insulator?
A) Plastic
B) Glass
C) Wood
D) Wood
E) Sea Water

Answers

Sea water contains charged ions. These ions help in conduction of electricity. If you dip electrodes into salt water and connect them to voltmeter, you'll see deflection which implies salt water (sea water) is good conductor of electricity.

Final answer:

Option E) Sea Water is a poor electrical insulator among the given options, which include Plastic, Glass, Wood, and Sea Water, because the free ions in sea water enable it to conduct electricity well.

Explanation:

The question asks which of the given options is a poor electrical insulator. A poor electrical insulator would be a good conductor of electricity. Out of the options provided (Plastic, Glass, Wood, and Sea Water), option E) Sea Water is a poor insulator because it contains a high concentration of free ions, making it a good conductor of electricity. This is in stark contrast to materials like plastic, glass, and wood, which are known to be good insulators because they do not allow charges to move through them easily.

Materials like Styrofoam, fiberglass, and goose-down feathers are also mentioned as examples of good insulators, as they contain small pockets of air which is a poor conductor of heat. However, for electrical insulation, air's thermal properties are less relevant than its ability to prevent electric charge movement. When discussing electrical insulators, it's important to note that the presence of free ions, as found in Sea Water, can lead to better conductivity of electricity, making it a poor electrical insulator.

A 3.5-inch (diameter) floppy disk in a computer rotates with a period of 2.0*10^-1s. If the angular speed is 31.4 rad/s. Whats is the liner speed? ...?

Answers

Final answer:

The linear speed of a point on a 3.5-inch floppy disk rotating at 31.4 rad/s is calculated using the formula v = r⋅ω, resulting in a linear speed of 1.396 m/s.

Explanation:

The question is about determining the linear speed of a point on a 3.5-inch floppy disk that rotates with an angular speed. The linear speed v can be calculated using the formula v = r⋅ω, where r is the radius of the disk and ω is the angular speed. Given the diameter of the disk is 3.5 inches, we must first convert it to the radius in meters which is 0.04445 meters (since 1 inch = 0.0254 meters). Therefore, the linear speed is v = 0.04445 m × 31.4 rad/s = 1.396 m/s.

what phenomenon naturally warms earth's lower atmosphere and surface

Answers

It seems that you have missed the given options for this question, but anyway, the correct answer would be the GREENHOUSE EFFECT. The phenomenon that naturally warms the earth's lower atmosphere and surface is called the greenhouse effect. Hope this answers your question. Have a great day!

Lava blown out of a volcano in explosive eruption is called pumice. True False

Answers

Final answer:

The claim that lava blown out of a volcano is called pumice is False; pumice is a volcanic rock formed from cooling lava with trapped gas, not the lava itself.

Explanation:

The statement that lava blown out of a volcano in an explosive eruption is called pumice is False. Pumice is not lava itself, but rather a type of volcanic rock that forms when frothy lava cools and solidifies with a high volume of gas bubbles trapped inside. Pumice is a vesicular felsic igneous extrusive rock that is light enough to float on water due to its numerous gas bubble cavities giving it a very low density.

Pumice is characterized by a frothy texture and typically takes on a whitish, light grayish, or very light brown color. Most notably, pumice has a high porosity because of the many gas bubbles that were present in the originating lava. While pumice results from volcanic eruptions, it is the solid portion that forms from rapidly cooling lava with trapped gas bubbles, distinguishing it from molten lava ejected during an eruption.

In the context of volcanic fragmental rocks such as tuff, pumice fragments can be found within a light-colored volcanic ash. These rocks are formed by explosive volcanic eruptions that blast solid fragments and ash into the atmosphere.

Consider the following geometric solids.
A sphere with a ratio of surface area to volume equal to 0.08 m-1.
A right circular cylinder with a ratio of surface area to volume equal to 2.1 m-1.
What results would you expect if these two models were compared in a diffusion test?

A. The rate of diffusion would be the same for the two models.
B. The rate of diffusion would be faster for the right cylinder.
C. The rate of diffusion would be slower for the right cylinder.
D. The rate of diffusion would be faster for the sphere.

Answers

B
The greater the surface area to volume ratio, the greater the rate of diffusion.

Before answering this question, first we have to understand the effect of ratio of surface area to volume on the rate of diffusion.

The rate of diffusion for a body having larger surface area as compared to the ratio of surface area to volume will be more than a body having less surface area. Mathematically it can written as-

                           V∝ R            [ where v is the rate of diffusion and r is the ratio of surface area to volume]

As per the question,the ratio of surface area to volume for a sphere is given [tex]0.08m^{-1}[/tex]

The surface area to volume ratio for right circular cylinder is given [tex]2.1m^{-1}[/tex]

Hence, it is obvious that the ratio is more for right circular cylinder.As the rate diffusion is directly proportional to the surface area to volume ratio,hence rate of diffusion will be more for right circular cylinder.

Hence the correct option is B. The rate of diffusion would be faster for the right cylinder.


Explain what happens to the particles in a substance during a physical change.

Answers

During Physical Change there would be a re-arrangements of atoms or molecules, changes of the arrangement may be change in the distance between atoms or molecules, change in the crystal form, .....etc 

for example: water when heated it undergoes a Physical Change and turn into vapor, this means the heat cause the distance between water molecules to increase, so it transferred from the liquid form to the gas form. 

NOTE that in Physical Change there is no change in the chemical structure and the material retains all its chemical properties, and no new compounds are produced. 

again, A physical change is any change not involving a change in the substance's chemical identity. Matter undergoes chemical change when the composition of the substances changes: one or more substances combine or break up (as in a relationship) to form new substances.Physical changes occur when objects undergo a change that does not change their chemical nature. A physical change involves a change in physical properties. Physical properties can be observed without changing the type of matter. Examples of physical properties include: texture, shape, size, color, odor, volume, mass, weight, and density. 

BUT in Chemical Change ( or Chemical Reaction ) there would be change in the chemical nature of the material undergoing a Chemical Change with the production of new compounds.

Explanation:

Physical change is a change in which there is no change in chemical composition of the substance.

For example, when we freeze liquid water then it changes into solid, that is, only physical state of water has changed and no change in chemical composition.

Therefore, in a physical change there is change only in the arrangement, energy and movement of particles.

A 200. N wagon is to be pulled up a 30 degree incline at constant speed. How large a force parallel to the incline force is needed? Assume no friction. ...?

Answers

Answer:

F = 100 N

Explanation:

Since the wagon is pulled along the inclined plane upwards so here the component of the weight of the wagon will act down the plane.

There is no friction force on the wagon so here in order to move the wagon upwards along the plane we require a force along the plane upwards which must be of same magnitude as that the magnitude of weight along the plane downwards.

now the component of weight along the inclined is given as

[tex]F = Wsin\theta[/tex]

[tex]F = 200 sin30[/tex]

[tex]F = 200(0.5) [/tex]

[tex]F = 100 N[/tex]

To pull a 200 N wagon up a 30-degree incline at constant speed, a parallel force of 100 N is needed. This calculation assumes no friction. It is derived using the component of the gravitational force parallel to the incline.

To determine the force needed to pull a 200 N wagon up a 30-degree incline at a constant speed, we need to analyze the components of the gravitational force acting on the wagon.

The gravitational force acting down the incline is given by: F_parallel = F_gravity * sin(theta)Given that the gravitational force (weight) is 200 N and the incline angle (theta) is 30°, we use the sine function:F_parallel = 200 N * sin(30°)Since sin(30°) = 0.5F_parallel = 200 N * 0.5 = 100 N

Therefore, a force of 100 N parallel to the incline is needed to pull the wagon up at a constant speed, assuming no friction.

The express train can travel 100 miles per hour. This information describes the train's
Answer
acceleration.
direction.
speed.
velocity.
...?

Answers

The best and most correct answer among the choices provided by your question is the fourth choice.

The information describes the train's SPEED.

I hope my answer has come to your help. Thank you for posting your question here in Brainly. We hope to answer more of your questions and inquiries soon. Have a nice day ahead!

Answer:

Speed

Explanation:

The information "100 miles per hour" describes that the train travels 100 miles of distance in a time period of 1 hour. we know that the speed is defined as the distance traveled by an object in unit interval of time with no information about the direction of motion. hence the information "100 miles per hour" about the express train describes the speed of the train.

Which of these is the best method to estimate the speed at which a star is moving away from Earth?


measure the star's red shift

calculate the pitch due to changes in frequency of light

calculate the parallax due to changes in Earth's position

measure the star's blue shift ...?

Answers

The best and most correct answer among the choices provided by your question is the first choice or letter A.

The best method to estimate the speed at which a star is moving away from Earth is to measure the star's red shift.

I hope my answer has come to your help. Thank you for posting your question here in Brainly. We hope to answer more of your questions and inquiries soon. Have a nice day ahead!

Answer A. Red shift. verified 12/21/18 per test results.

Which of the following is true of both nuclear fusion and nuclear fission?
a.
They both require a high energy input.
b.
They both occur without byproducts.
c.
They both have a high energy output.
d.
They both involve large atoms breaking into smaller atoms.

Answers

Answer:

c. They both have a high energy output.

Explanation:

- Nuclear fusion is the process in which two lighter nuclei combine together into a heavier nucleus

- Nuclear fission is the process in which a heavier nucleus breaks apart into smaller nuclei

In both cases, a huge amount of energy is released. In fact:

- In the nuclear fusion, the mass of the heavier nucleus is slightly lower than the sum of the masses of the two initial nuclei: this means that part of the initial mass has been converted into energy, according to the equation

[tex]E=mc^2[/tex]

and we can see that even for small amount of mass, m, the energy released is huge

- In the nuclear fission, the mass of the final products is less than the mass of the initial heavier nucleus, so again, part of the initial mass has been converted into energy, according to the equation

[tex]E=mc^2[/tex]

a.  They both require a high energy input.  No.  Fission doesn't require ANY energy input to get going.  

b.  They both occur without byproducts.   No.  The by-products of fission are the biggest real problem in commercial nuclear power . . . where to put the bad stuff that's left over.

c.  They both have a high energy output.  Yes !

d.  They both involve large atoms breaking into smaller atoms.  No.  'Fission' involves large nucleii breaking into smaller ones.  'Fusion' is exactly the opposite ... combining small nucleii into more complex ones.

A parachutist with a camera descends in free fall at a speed of 10m/s. The parachutist releases the camera at an altitude of 50m. A) How long does it take the camera to reach the ground? B) What is the velocity of the camera before it hits the ground?

Answers

Final answer:

The camera takes approximately 2.02 seconds to reach the ground after being released by the parachutist, and just before hitting the ground, the velocity of the camera is approximately 29.8 m/s.

Explanation:

To solve for the time it takes for the camera to reach the ground (A) and the velocity of the camera before it hits the ground (B), we can use the equations of motion under the influence of gravity. Assuming the acceleration due to gravity (g) is 9.8 m/s², and the initial velocity of the camera (u) is 10 m/s (since it's released in free fall by the parachutist moving downward at this speed).

Part A: Time to Reach the Ground

We use the equation: s = ut + 0.5gt², where s is the distance (50m), u is the initial velocity, and t is the time in seconds. Plugging in the values, we get:

50 = 10t + 0.5*9.8*t²

Solving this quadratic equation for t, we find that the time taken for the camera to reach the ground is approximately 2.02 seconds.

Part B: Velocity Before Hitting the Ground

The final velocity (v) can be found using the equation: v = u + gt. Substituting u = 10 m/s, g = 9.8 m/s², and t = 2.02s:

v  = 10 + 9.8*2.02 ≈ 29.8 m/s

Therefore, the velocity of the camera just before it hits the ground is approximately 29.8 m/s.

Only a change in temperature can bring about a change in state. A change in pressure cannot bring about a change of state.
True
False Only a change in temperature can bring about a change in state. A change in pressure cannot bring about a change of state.
True
False

Answers

Answer:

The answer is False

Explanation:

Pressure is understood as a force exerted by a gas, a liquid or a solid on a surface. An increase in pressure tends to favor volume contraction. For example, the lower the pressure exerted on the surface of a liquid, the easier it is to vaporize, because the molecules of the liquid find less resistance to leave it and transform into steam.

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