Answer:
a = - 6 m/s/s
here negative sign shows that velocity is decreasing with time
Explanation:
As we know that average acceleration is given by
[tex]a_{avg} = \frac{v_f - v_i}{\Delta t}[/tex]
here we will have
[tex]v_f[/tex] = final speed = 0 m/s
[tex]v_i[/tex] = initial speed = 9 m/s
[tex]\Delta t[/tex] = time interval = 1.50 s
now from above equation we will have
[tex]a = \frac{0 - 9}{1.5}[/tex]
[tex]a = - 6 m/s^2[/tex]
so average acceleration will be -6 m/s/s
If you do 200 joules of work using a force of 5 newtons,over what distance will the force applied
The smallest unit of an element that maintains the properties of that element is a (n)
How many neutrons does element X have if its atomic number is 48 and its mass number is 167?
How many neutrons?
A ball rolls off the edge of a horizontal roof at 10 m/s. 2 seconds later, the speed of the ball will be? a. 10 m/s b. 19.6m/s c. 29.6 m/s d.22 m/s ...?
The ball will have a speed of 22 m/s after 2 seconds.
Explanation:When the ball rolls off the edge of a horizontal roof, it becomes a projectile and begins to fall under the influence of gravity. The horizontal component of its velocity remains constant, so after 2 seconds, the ball will still have a horizontal speed of 10 m/s.
However, the vertical component of its velocity will increase due to the acceleration of gravity. The acceleration due to gravity is approximately 9.8 m/s². So after 2 seconds, the ball will have accelerated 9.8 m/s² for 2 seconds, resulting in a change in velocity of 19.6 m/s.
To find the speed of the ball after 2 seconds, we need to find the resultant velocity by using the Pythagorean theorem. The initial horizontal velocity is 10 m/s and the change in vertical velocity is 19.6 m/s. So:
Resultant velocity = sqrt((10)^2 + (19.6)^2) = 22 m/s.
Therefore, the correct answer is d. 22 m/s.
Final answer:
The final speed of a ball rolling off a horizontal roof with an initial horizontal speed of 10 m/s after 2 seconds will be 22 m/s, due to the additional vertical velocity it gains from gravity. So the correct option is d.
Explanation:
A ball rolls off the edge of a horizontal roof at 10 m/s. To determine the speed of the ball 2 seconds later, we use the equation for the final velocity of an object in free fall: v = u + at, where v is the final velocity, u is the initial velocity, a is the acceleration due to gravity (9.8 m/s²), and t is time. Since the ball rolls off horizontally, the initial vertical velocity is 0, and the horizontal velocity remains the same since there's no air resistance. Hence, the horizontal velocity after 2 seconds is still 10 m/s. For the vertical velocity, we use u=0, a=9.8 m/s², and t=2 s:
Vertical velocity after 2 seconds = 0 m/s + (9.8 m/s² * 2 s) = 19.6 m/s
We now have both horizontal and vertical velocities. The speed of the ball will be the vector sum of these two velocities, calculated using the Pythagorean theorem:
Total speed = sqrt(10 m/s² + 19.6 m/s²) = 22 m/s
Therefore, the correct answer is (d) 22 m/s.
How many complete revolutions are needed to draw the angle 725°?
a. 3
b. 1
c. 2
d. 4
Answer:
[tex]725\ degree=2\ revolution[/tex]
Explanation:
We know that 1 complete revolution is equal to 360 degrees. We need to find the number of complete revolution needed to draw the angle of 725 degrees.
Since, 1 revolution = 360 degrees
or
[tex]1\ revolution=2\pi \ radian[/tex]
[tex]1\ degree=\dfrac{1}{360}\ revolution[/tex]
[tex]725\ degree=\dfrac{725}{360}\ revolution[/tex]
[tex]725\ degree=2.01\ revolution[/tex]
or
[tex]725\ degree=2\ revolution[/tex]
So, to draw an angle of 725 degrees, there are 2 revolutions. Hence, this is the required solution.
What is the basis for dividing the atmosphere into four layers?
The basis for dividing the atmosphere into four layers is due to the temperature gradient of the layers.
What is meant by atmosphere ?The layer of gases that covers Earth is known as the atmosphere. The gravitational pull of the planet's neighbor, Earth, keeps it close to the surface.
Here,
The troposphere, stratosphere, mesosphere, thermosphere, and exosphere are the principal layers of the atmosphere, listed in order from lowest to highest. The troposphere of the planet is a layer of air that rises from the surface of the planet to an average height of 12 kilometres (7.5 miles), however it is higher in the equator and lower at the poles.
Temperature gradient is the term used to describe a difference in temperature with distance. According to the temperature gradient inside each layer, the Earth's atmosphere is classified into layers, and each layer's heat source defines its own temperature gradient.
Hence,
The basis for dividing the atmosphere into four layers is due to the temperature gradient of the layers.
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Select the sentence that best describes why copper and some other metals are good conductors.
A) Copper atoms have loosely held electrons; this means they can freely move in and out of the nucleus of the atom.
B) Copper atoms have a loosely held free electron in their outer shell that is able to move freely to other atoms.
C) Copper and some other metals have highly active inner shells. This means that electrons can be freely exchanged between shells.
D)Copper has a small number of electrons; this means it can easily shed these electrons and take electrons from other atoms.
Answer:
B) Copper atoms have loosely held free electrons in their outer shell that is able to move freely in other atoms.
Explanation:
A material which has loosely held free electrons in its outermost shell is always a good conductor. These loosely held free electrons move from atoms to atoms and cause conductivity. It is known that copper and other metals are good conductors. Therefore, option (B) supports the argument and is a right answer.
13. Abrasion erodes the desert surface by *
a. Creating blowouts
b. Cutting and polishing exposed rock surfaces
c. Depositing loess across the landscape
d. Creating a stony surface layer
A star is a luminous ball of hot ______ held together by its own gravity.
A. dark matter
B. energy
C. plasma
Answer:
C) plasma
A star is a luminous ball of hot plasma held together by its own gravity.
Explanation:
Stars are formed from molecular clouds. When a cloud receives an impact wave from a near supernova or another astronomical event, as a consequence, it will start to collapse under its gravity, until it breaks in small pieces (each of this pieces will become a star).
Stars are submitted to a hydrostatic equilibrium (its gravitational force pulls inward and its nuclear pressure pulls outward), that gave rise to higher pressures and higher temperatures, those temperatures allow atoms being completely ionized¹. Stars are compounded with a gas mixture of atoms, free protons and free electrons (plasma).
¹Ionized: When an atom loses electrons.
a 155 gram sample of copper was heated to 150.0ºC then placed into 250 gram of water at 19.8ºC. (The specific heat of copper is 0.385J/gºC.)Calculate the final temperature of the mixture. (assume no heat loss to the surroundings)
Can centripetal force ever do work on an object? ...?
during nuclear fission and fusion matter that seems to disappear is actually converted into
During nuclear fission and fusion matter that seems to disappear but is actually converted into energy.
What is nuclear fission and fusion?When the slow moving neutrons are bombarded with the heavy radioactive nuclei, the product is the more number of neutrons are produced with the large amount of energy. This multiplying process is called nuclear fusion.
The amount of energy produced in such a reaction can be calculated using the equivalence of mass and energy relationship.
E = mc²
The same happens in nuclear fusion where large amount of energy is needed to make more heavy nuclei.
Thus, during nuclear fission and fusion matter that seems to disappear but is actually converted into energy.
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During nuclear fusion and fission, the matter that seems to disappear is converted into energy.
This is explained by Einstein's famous equation which shows that energy and mass are interchangeable:
E = mc²Here:
E = Energym = mass of the objectc = speed of lightThis equation explains that:
In nuclear fission, the nucleus of an atom splits into smaller nuclei, releasing a significant amount of energy. In nuclear fusion, smaller atomic nuclei combine to form a larger nucleus, also releasing substantial energy. The small mass lost in these reactions is converted into energy.That is why during nuclear fusion and fission reactions, the matter that seems to disappear is actually converted into energy.
The distance formula can be used to prove a quadrilateral has select one:
a. a right angle
b. congruent angles
c. parallel sides
d. congruent sides
Answer: d. congruent sides
Explanation:
The distance formula is a formula in geometry to calculate the length of a line segment having two distinct point on a Cartesian plane
The distance formula to calculate the distance between two distinct points A(a,b) and B(p,q) is given by :-
[tex]\text{d}=\sqrt{(p-a)^2+(q-b)^2}[/tex]
Since it is used to calculate the distance between two points therefore, it is used to check whether a quadrilateral has congruent sides.
Hence, the distance formula can be used to prove a quadrilateral has congruent sides.
How many dwarf planets are there in our solar system?
Our Sun and Earth are part of what we call our solar system. There are eight big planets and five small, dwarf planets in the solar system. Each planet orbits the Sun.
Which of the following is an example of speed only?
A. 25 kilometers per hour (25 km/h)
B. 45 miles per hour to the east (45 mph to the east)
C. 60 meters per hour per second (60 m/h s)
...?
25 kilometers per hour (25 km/h) is an example of speed only.
Thus, Velocity is the pace and direction of an object's movement, whereas speed is the time rate at which an object is travelling along a path.
In other words, velocity is a vector, whereas speed is a scalar value. For instance, 50 km/hr west denotes the velocity of a car whereas 50 km/hr (31 mph) denotes the speed at which it is moving down a route.
The average speed of an object is determined by dividing the distance traveled by the amount of time it takes the object to go the distance, which is a pretty simple mathematical formula and speed.
Thus, 25 kilometers per hour (25 km/h) is an example of speed only.
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You need to move a 105kg sofa to a diffrent room. It takes a force of 102 N to start it moving. What is the coefficient of static friction between sofa and carpet? ...?
an is_____ produced around a wire when electrical current is in the wire
A fluid is
A.) a solid substance made up of crystals.
B.) a substance that has a definite shape and a definite volume.
C.) a substance that flows
D.) a substance that melts at a distinct temperature.
Sophie says that geologic maps do not matter because she gets no benefits from them. Why is Sophie wrong? a. She can see the ranges of mountains near her house. B. She needs to learn how to read geologic maps in school. C.She benefits from products that use minerals found using geologic maps. D.She can see the weather and dress appropriately.
Which is not a physical property?
A. Hardness
B. Boiling Point
C. Ability to conduct electricity
D. Ability to combine with oxygen
The correct answer to the question is D). Ability to combine with oxygen.
EXPLANATION:
Before going to answer this question, first we have to understand physical and chemical change.
The change or reaction is said to be physical if there will be no change in the chemical configuration of the substance. The property corresponding to this change is called physical property which won't change the configuration of the substance. It is measurable and simply denotes the physical states of a system.
A chemical change is a change in which a new substance is formed due to the chemical reaction. Here, both the reactants and products have different chemical configuration. The property corresponding to it is called chemical property.
As per our questions, hardness, boiling and ability to conduct electricity are the physical properties of a substance.
The ability to combine with oxygen is not a physical property. It is so because it will result into the formation of a new compound.
Hence, the correct answer to the question is the ability to combine with oxygen.
If gas in a sealed container has a pressure of 50 kPa at 300 K, what will the pressure be if the temperature rises to 360 K?
If the gas in a sealed container has a pressure of 50 kPa at 300 K, so the pressure if the temperature rises will be 60 kPa.
What is pressure?The physical force applied to an object is referred to as pressure. A perpendicular force is applied to the surfaces of the objects per unit area. The basic formula for pressure is F/A. (Force per unit area). Pressure is measured in Pascals (Pa).
There are several types pressure of them are Atmospheric Pressure, Gauge pressure, Differential Pressure, and Absolute pressure.
According to the question,
PV=nRT
P/T=nR/V
P/T= constant
Therefore,
(P/T)1=(P/T)2
50/100=P2/360
P2=50×(360/300)
P2= 60 kPa.
Hence, the pressure P2 is 60 kPa.
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a metal sphere with a mass of 90 kg rolls along at 16m/s and strikes a stationary sphere having a mass of 140kg. the first sphere stops completely. at what speed does the second sphere move away at?
A layer of material that helps block the transfer of heat between the air inside and outside a building is called
a. an active solar system.
b. a solar cell.
c. a heat exchanger.
d. insulation.
The Chinese Exclusion Act of 1882
1barred employers in U.S. cities from hiring Chinese workers.
2prohibited Chinese laborers from entering the country.
3stripped Chinese Americans of their U.S. citizenship.
4forced Chinese children to attend segregated schools. ...?
Answer: The answer is 2. Prohibited the Chinese laborers from entering the country.
Explanation: The Chinese Exclusion Act of 1882 was a federal law in the United States signed by President Chester. It effectively halted Chinese immigration. I hope your answer is very helpful, please mark me as Brainliest and have a wonderful day! :D
For the cart without a washer,how does the potential energy at the top of the ramp compare to the kinetic energy at the bottom of the ramp?
Every year, new records in track and field events are recorded. Let's take a historic look back at some exciting races.
In 1989, Carl Lewis established a world record when he ran the 100. meter dash in 9.92 seconds. What was his average speed (in m/s) for the race? Remember to include your data, equation, and work when solving this problem.
Answer: His average speed (in m/s) for the race was 10.08 m/s
Explanation:
Given data
Total distance traveled , D= 100 meter
Total time taken , T= 9.92 seconds
>The average speed([tex]V_{avg}[/tex] ) of an object is the total distance traveled by the object divided by the total time taken to cover that distance .i.e.,
[tex]V_{avg}=\frac{D}{T}=\frac{100}{9.92}\, \frac{m}{s}=10.08\: \frac{m}{s}[/tex]
Thus his average speed (in m/s) for the race was 10.08 m/s
How is the exposure rate generally expressed?
a. in roentgens per hour
b. in gray
c. in radiation absorbed dose
d. in microcurie
Answer:
a. in roentgens per hour
Explanation:
Exposure rate is the ratio of radiation exposure per unit of time. It is often used to measure radiation fields in the environment of a radioactive facility for exposure prevention and control. Exposure rate is generally expressed as per hour roentgens (R / h) used for X-ray or Gamma in air.
The röntgen or roentgen (R) is a unit of exposure to ionizing radiation. The name was given as a tribute to the German physicist Wilhelm Conrad Röntgen (or Roentgen) (1845-1923) who discovered X-rays.
2 Resistors of resistance, R = (100 +- 3) Ohm, R2 = (200+-4)Ohm are connected in Parallel and Series.
Find the absolute error and % error in the measurement of equivalent resistance are in each combinations I.e Series and Parallel.. ??
The absolute error and % error in the measurement of equivalent resistance are :
Series → 7 Ohm and 2%Parallel → 5 Ohm and 7%Further explanationElectrical circuits can generally be divided into two types , i.e :
1. Series CircuitIn series circuit, the electric current flowing on each resistor is always the same as the total current.
To find the total resistances you can use the following formula:
[tex]\large {\boxed {R_s = R_1 + R_2 + R_3 + ...} }[/tex]
2. Parallel CircuitIn parallel circuits, the electrical voltage at each resistor is always the same as the source voltage.
To find the total resistances you can use the following formula:
[tex]\large {\boxed {\frac{1}{R_p} = \frac{1}{R_1} + \frac{1}{R_2} + \frac{1}{R_3} + ...} }[/tex]
Let's tackle the problem now !
Given:
[tex]R_1 = 100 \pm 3 ~ Ohm[/tex]
[tex]R_2 = 200 \pm 4 ~ Ohm[/tex]
Unknown:
Absolute Error = ?
% Error = ?
Solution:
In Series Circuit :[tex]R_s = R_1 + R_2[/tex]
[tex]R_s = ( 100 \pm 3 ) + ( 200 \pm 4 )[/tex]
[tex]\large {\boxed {R_s = 300 \pm 7 ~ Ohm} }[/tex]
Absolute Error = 7 Ohm% Error = (7/300) x 100% ≈ 2%In Parallel Circuit :[tex]\frac{1}{R_p} = \frac{1}{R_1} + \frac{1}{R_2}[/tex]
[tex]\frac{1}{R_p} = \frac{R_2}{R_1 ~ R_2} + \frac{R_1}{R_2 ~ R_1}[/tex]
[tex]\frac{1}{R_p} = \frac{R_1 + R_2}{R_1 ~ R_2}[/tex]
[tex]R_p = \frac{R_1 ~ R_2}{R_1 + R_2}[/tex]
[tex]R_p = \frac{100 \times 200}{100 + 200}[/tex]
[tex]R_p = \frac{20000}{300}[/tex]
[tex]R_p = \frac{200}{3} ~ Ohm[/tex]
[tex]R_p \approx 67 ~ Ohm[/tex]
To find the % Error , we will use this following formula :
[tex]\frac{\Delta R_p}{R_p} = \frac{\Delta R_1}{R_1} + \frac{\Delta R_2}{R_2} + \frac{\Delta (R_1 +R_2)}{R_1 + R_2}[/tex]
[tex]\frac{\Delta R_p}{R_p} = \frac{3}{100} + \frac{4}{200} + \frac{7}{300}[/tex]
[tex]\frac{\Delta R_p}{R_p} = \frac{11}{150}[/tex]
[tex]\frac{\Delta R_p}{R_p} = \frac{11}{150} \times 100{\%}[/tex]
[tex]\frac{\Delta R_p}{R_p} \approx 7{\%}[/tex]
[tex]Absolute ~ Error = \Delta R_p[/tex]
[tex]Absolute ~ Error = \frac{11}{150} \times \frac{200}{3}[/tex]
[tex]Absolute ~ Error = \frac{44}{9}[/tex]
[tex]Absolute ~ Error \approx 5 ~ Ohm[/tex]
[tex]\large {\boxed {R_p = 67 \pm 5 ~ Ohm} }[/tex]
Learn moreThe three resistors : https://brainly.com/question/9503202A series circuit : https://brainly.com/question/1518810Compare and contrast a series and parallel circuit : https://brainly.com/question/539204Answer detailsGrade: High School
Subject: Physics
Chapter: Current of Electricity
Keywords: Series , Parallel , Measurement , Absolute , Error , Combination , Resistor , Resistance , Ohm
Object A attracts object B with a gravitational force of 10 newtons from a given distance. If the distance between the two objects is doubled, what is the changed force of attraction between them?
A. 2.5 newtons
B. 5 newtons
C. 20 newtons
D. 100 newtons
By definition, the gravitational force is given by:
[tex] F = G(\frac{m1m2}{r^2}) [/tex]
Where,
G: gravitational constant
m1: mass of object 1
m2: mass of object 2
r: distance between objects:
We know that the force is equal to 10N:
[tex] G(\frac{m1m2}{r^2}) = 10 [/tex]
If the distance is double we have:
[tex] F = G(\frac{m1m2}{(2r)^2}) = G(\frac{m1m2}{4r^2}) = \frac{1}{4}G(\frac{m1m2}{r^2}) [/tex]
[tex] \frac{1}{4}(10) = 2.5 [/tex]
Therefore, the new force is:
2.5 newtons
Answer:
the changed force of attraction between them is:
A. 2.5 newtons
Selecting a signaling site and putting your signal in a suitable location is critical. a signaling site is defined as any site, based on your situation that enhances signaling efforts and the likelihood for the signal to be detected by friendly forces. what is a signaling site criterion?
A signaling site criterion involves selecting a location based on characteristics that enhance the likelihood of successful signal transmission, much like the site location analysis done by geographers.
Explanation:A signaling site criterion is an important factor when selecting a location for sending out signals so that they can be effectively detected by friendly forces or intended recipients. This concept is similar to site location analysis in geography, where geographers assess various factors to determine the most advantageous location for a city, business, or other establishments based on site and situation factors. The criteria focus on attributes such as the availability of resources, the location's visibility, accessibility, and the likelihood of successful signal transmission. Like how a city benefits from a good harbor or central location, a signaling site should enhance the probability of signal detection while considering both the physical characteristics of the site and the external factors affecting its efficacy.