Answer:
13.9 m/s
Explanation:
The velocity of the train along the inclined surface is given by the ratio between the distance travelled, d, and the time taken, t:
[tex]v=\frac{d}{t}[/tex]
where we have
d = 400 m
t = 5 s
Substituting,
[tex]v=\frac{400 m}{5 s}=80 m/s[/tex]
This is the velocity of the train along the inclined plane. Now we can find the vertical component of the velocity by using the formula:
[tex]v_y = v sin \theta[/tex]
where [tex]\theta=10^{\circ}[/tex] is the angle of the slope. Substituting, we find
[tex]v_y = (80 m/s)(sin 10^{\circ})=13.9 m/s[/tex]
A person pushes a crate up a 4-m high ramp for a distance of 18m.
a) What is the mechanical advantage of the ramp?
b) How hard does the person have to push if the crate weights 400 N
a) 4.5
The mechanical advantage of a frictionless ramp is given by:
[tex]MA=\frac{L}{h}[/tex]
where
L is the length of the ramp
h is the height of the ramp
In this problem,
L = 18 m
h = 4 m
Substituting these values into the formula, we find
[tex]MA=\frac{18 m}{4 m}=4.5[/tex]
b) 88.9 N
For a frictionless ramp, the input work is equal to the output work:
[tex]W_i = W_o\\F_i L = F_o h[/tex]
where
[tex]F_i[/tex] is the force applied by the person
L = 18 m is the length of the ramp
[tex]F_o = 400 N[/tex] is the output force, which corresponds to the weight of the crate
h = 4 m is the height of the ramp
Solving the equation for [tex]F_i[/tex],
[tex]F_i = \frac{F_o h}{L}=\frac{(400 N)(4 m)}{18 m}=88.9 N[/tex]
Which releases more energy, 100 grams of 100c water cooling to 50c, or 100 grams of iron at 100c cooling to 50c
Answer:Water
Explanation:
The 100g of water cooling from 100°C to 50°C releases more energy (5000 cal) compared to the 100g of iron cooling from the same temperature (535 cal). This is determined by the concept of specific heat capacity.
Explanation:To determine which releases more energy, we'll need to consider the concept of specific heat capacity, a property that depends solely on the type of substance absorbing or releasing heat. This is what will be crucial in deciding whether the 100g of water cooling from 100C to 50C or the 100g of iron cooling from 100C to 50C releases more energy. The specific heat capacity of water is around 1.00 cal/g °C, while the specific heat of iron is found to be about 0.449 J/g °C, as per given statements.
Calculating the heat or energy (q) lost in the cooling process is given by the formula q=mcΔT, where m stands for mass, c represents specific heat capacity, and ΔT is the temperature change. For water, we have q = (100g)(1 cal/g °C)(50°C) = 5000 cal. For iron, we need to first convert the specific heat capacity to cal/g °C (1 J = 0.239 cal), giving us ~0.107 cal/g °C. So, q = (100g)(0.107 cal/g °C)(50°C) = 535 cal for iron.
As evident, the 100 grams of water cooling from 100°C to 50°C releases more energy (5000 cal) than the 100 grams of iron undergoing the same temperature change (535 cal).
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In a series circuit which of the following is the same throughout the circuit
a.voltage
b.resistance
c.current
d.none of the above
Answer:
C. Current.
Explanation:
A serie circuit is a closed circuit with only one path to the current to flow. This mean that the current is the same throughout the circuit, the sum of the voltage drop in each load is equal to the voltage given for the voltage source. In this circuit if one load blow out, the current will stop flowing.
What are the reactants of cellular respiration? Check all that apply. carbon dioxide energy glucose oxygen water
Answer:
Glucose and Oxygen
Explanation:
Cellular respiration is the process whereby cells derives energy by the use of glucose and oxygen.
Organisms that use cellular respiration to produce their energy are known as heterotophs. They derive the glucose from food materials obtained from plant sources. They use the oxygen from the environment to liberate energy from the glucose obtained from feeding on plant materials.
Cellular respiration can be simply expressed as shown below:
GLUCOSE + OXYGEN → CO₂ + H₂O + ATP
The reactants are glucose and oxygen.
The products are CO₂, water and ATP
The reactants of cellular respiration are oxygen and glucose. These substances combine in a process that takes place in the mitochondria, ultimately producing ATP alongside waste products carbon dioxide, and water.
Explanation:Cellular respiration is a fundamental metabolic process that occurs in the cells of organisms to produce energy. The reactants of cellular respiration are oxygen and glucose. Oxygen is taken into the body through the process of breathing, and glucose enters the body via the food organisms eat. These reactants are essential for the production of adenosine triphosphate (ATP), the energy currency of cells.
The equation for cellular respiration can be represented as follows: C6H12O6 + 6O2 → 6CO2 + 6H2O + Energy. This indicates that one molecule of glucose (C6H12O6) and six molecules of oxygen (O2) are transformed into six molecules of carbon dioxide (CO2) and six molecules of water (H2O), releasing energy in the process.
The main product of cellular respiration is ATP, which is generated from the energy released during the conversion of glucose and oxygen into carbon dioxide and water. The waste products, carbon dioxide and water, are byproducts of this reaction.
Describe what happens when electrical impulses cross muscle fibers
Answer:
When the electrical potential reaches a threshold, an actual potential occurs in the muscle fibers.
Explanation:
A muscle fiber is a special type of a cell which can change its shape due to actin chains sliding across each other. This process then causes changes in the electrical potential of the muscle.
There are few types of muscle fiber that designed for specific type of muscles activity. Some of them involved in endurance exercises whereas others are best for the strength exercises. These muscles fibers are attached to bones allowing them to move.
Mr. and Mrs. Tew attended this summer band concert to her their son play his violin. When they sat down in their seats, they noticed that there were dead moments. That is, places in the music when they could not hear anything! They decided to move and sit directly in front of the band in the third row. How can you explain the dead spots they experienced?
Answer:
The dead spot experienced was due to the effect of sound wave interference
Explanation:
Sound wave interference occurs when wave interact. They can interact constructive manner increasing each other's strength and rising the intensity of the final wave produced.The waves can also interact destructively reducing each other's strength and intensity.In some cases, destructive interaction causes a total cancelling of the waves resulting to places where no sound can be heard at all.This area is the dead spot.
Which describes how sliding friction affects pushing a cereal box across a tabletop?
It is usually greater than static friction.
It acts in the direction of motion.
It equals the weight of the box.
It acts in the direction opposite of motion.
Answer:
It acts in the direction opposite of motion.
Explanation:
The sliding friction is the one offering resistance to motion of the sliding cereal box.This force is created between the box and the tabletop that are sliding against each other.The sliding friction is proportional to the weight of the cereal box when pushed on the horizontal tabletop.We can apply the Newton's second law of motion to describe this motion, where force is a product of mass and acceleration.When the object is massive, the sliding friction force experienced is high thus sliding happens slowly.
Help on the blank problem?
Answer:
0.03 s
Explanation:
The maximum force is 90 N, and the mass is 0.2 kg, so we can find the deceleration:
F = ma
-90 N = (0.2 kg) a
a = -450 m/s²
The initial velocity is 14 m/s, and the final velocity is 0 m/s, so the time is:
v = at + v₀
0 m/s = (-450 m/s²) t + 14 m/s
t = 0.03 s
The fastest she can slow it down to a stop without breaking it is in 0.03 s.
Which of the answers is most accuracy for balancing nuclear equations?
Answer:
#4
Explanation:
In balanced nuclear and chemical equations, the sums of the subscripts on each side of the equation and the sums of the superscripts are the same. The most useful quantity for counting particles is the mole. Steps for balancing a chemical equation involve identifying the most complex substance, balancing the atoms and polyatomic ions, and counting the numbers of atoms to ensure a balanced equation.
Explanation:In balanced nuclear equations, the sums of the subscripts on each side of the equation are the same, as are the sums of the superscripts.
The most useful quantity for counting particles is the mole. So if each coefficient is multiplied by a mole, the balanced chemical equation tells us that 1 mole of nitrogen reacts with 3 moles of hydrogen to produce 2 moles of ammonia. This is the conventional way to interpret any balanced chemical equation.
Steps in Balancing a Chemical Equation:
Identify the most complex substance.Beginning with that substance, choose an element(s) that appears in only one reactant and one product, if possible. Adjust the coefficients to obtain the same number of atoms of this element(s) on both sides.Balance polyatomic ions (if present on both sides of the chemical equation) as a unit.Balance the remaining atoms, usually ending with the least complex substance and using fractional coefficients if necessary. If a fractional coefficient has been used, multiply both sides of the equation by the denominator to obtain whole numbers for the coefficients.Count the numbers of atoms of each kind on both sides of the equation to be sure that the chemical equation is balanced.
Where would a positive test charge have the least potential energy?
actually the line through the midpoint and perpendicular to the line joining the two charges. that the positive and negative charges are equal in magnitude.
A positive test charge only has potential energy if there's a negative charge out there somewhere, attracting it.
As long as the positive charge is not right up close to the beckoning negative charge, it'll spring in that direction if you let it.
So the positive test charge doesn't run out of potential energy until it reaches the place of its heart's desire ... as far from other positive charges as it can get, AND up against or on top of the nearest negative charge.
The phrases describes what layer of the atmosphere
Meteors burn up here
special lighting called sprites
noctilucent clouds form over north and south poles
1. exophere
2. ionosphere
3. mesophere
4. thermosphere
Answer:
the answer is Mesosphere
Explanation:
How does the intensity of a sound wave change if the distance from the source is reduced by a factor of 3?
Answer:
The intensity increases by a factor 9
Explanation:
The intensity of a sound wave follows an inverse square law, that means that it is inversely proportional to the square of the distance:
[tex]I\propto \frac{1}{r^2}[/tex]
where r is the distance from the source.
In this problem, the distance from the source is reduced by a factor 3, so the new distance is
[tex]r'=\frac{1}{3}r[/tex]
this means that the new intensity will be
[tex]I' \propto \frac{1}{r'^2}=\frac{1}{(\frac{1}{3}r)^2}=9\frac{1}{r^2}=9I[/tex]
So, the intensity will increase by a factor 9.
Answer:
The intensity increases by a factor of 9
An oceanic depth-sounding vessel (sonar) surveys the ocean bottom with ultrasonic sound that travels at an average of 1522m/s. How deep is the water if the time delay of the echo from the ocean floor is 2.0s?
Answer:
1522 m
Explanation:
The ultrasound wave takes t=2.0 s to travel from the vessel to the ocean bottom, and then back to the vessel.
This means that the time the wave takes to travel from the vessel to the ocean bottom is just half of this:
[tex]t=\frac{2.0 s}{2}=1.0 s[/tex]
The wave travels at a speed of
v = 1522 m/s
So, we can find the distance between the vessel and the ocean bottom by using the equation of the uniform motion, and we find:
[tex]d=vt=(1522 m/s)(1.0 s)=1522 m[/tex]
the atmosphere's layers
1. The lowest stratum of the atmosphere
stratosphere
troposphere
mesosphere
2. Most of the earth's ozone is located in the
stratosphere
troposphere
mesosphere
3. Earth coldest temperature occur in the
stratosphere
mesosphere
troposphere
Answer:
1. The lowest stratum of the atmosphere
troposphere
2. Most of the earth's ozone is located in the
stratosphere
3. Earth coldest temperature occur in the
mesosphere
Explanation:
1: Troposphere
The troposphere is the lowest layer of the Earth's atmosphere. The air is very well mixed and the temperature decreases with altitude. Air in the troposphere is heated from the ground up. The surface of the Earth absorbs energy and heats up faster than the air does.
2: Stratosphere
Ozone is mainly found in two regions of the Earth's atmosphere. Most ozone (about 90%) resides in a layer that begins between 6 and 10 miles (10 and 17 kilometers) above the Earth's surface and extends up to about 30 miles (50 kilometers). This region of the atmosphere is called the stratosphere.
3: Stratosphere
As the mesosphere extends upward above the stratosphere, temperatures decrease. The coldest parts of our atmosphere are located in this layer and can reach –90°C. In the forth layer from Earth's surface, the thermosphere, the air is thin, meaning that there are far fewer air molecules.
Like his parents, Thomas is short, stocky, and heavyset. Although he exercises regularly and eats a well-balanced meal, his body composition stays the same. Explain what factor is most likely affecting his body composition..
Answer:The factor that is most likely affecting Thomas's body composition is genetics. Heredity influences the amount of fat a person possesses, and children with heavyset parents are more likely to be heavyset.
Explanation:
sample response
The factor that is affecting his body composition is genetic makeup.
The factors that affect body compositionThe body composition of an individual is the percentage of the body that is made up of fat, bone and muscles.
The percentage of each component found in an individual is determined by the following factors:
Gender, age, race, nutrition, physical activity, hormonal status andGenetic makeup.The deoxyribonucleic acid (DNA) of an individual can either have little or much effect on the body composition.
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Neutrons are also known as_____.
Neutrons are also known as subatomic particles. This means that they are smaller than an atom but they can be elementary or composite. Neutrons are located in the nucleus of the atom also called the center.
a train travels some distance with a speed of 30km/h and returns with a speed of 45km/h. Calculate the average speed of the train.
Answer:
let distance be D km
total time taken, T (hrs) = D/30 + D/50
Average speed , V = total distance/ total time = 2D/T = 2/(1/30+1/50) = 37.5 km/hr
Explanation:
Average speed = total distance / total time
= (30+45) km / 2hr
= 75 / 2
= 37.5 km/hr is the average speed of the train.
When does radioactive decay occur
A. When an atom gains electrons
B.when neutrons accumulate in the nucleus
C.when the nucleus decays
D.when an atom loses electrons
Answer:
C.when the nucleus decays
Explanation:
In chemical reactions, the outermost electrons of atoms are re-arranged somehow without the involvement of the nuclei of the participating atoms of the elements.
Nuclear reactions causes changes within the atomic nucleus. For every atomic nucleus, a specific neutron/proton ratio ensures stability. When the stability ratio differs an atom becomes unstable and splits into one or more other nuclei with the emission of small particles of matter. This is what radioactivity entails.
Radioactive decay occurs when the unstable nucleus of an atom loses energy by emitting radiation, transforming it into a different, more stable element. Option C, when the nucleus decays, is the correct answer.
Radioactive decay occurs when an unstable atomic nucleus loses energy by emitting particles or electromagnetic waves. Among the given options, C. when the nucleus decays, is correct. This decay leads to the creation of different elements, as the original atom changes its atomic number. Alpha decay, beta decay, and gamma decay are some of the ways this process can occur. In alpha decay, an atom emits an alpha particle (two protons and two neutrons), which is equivalent to the nucleus of a helium atom. Through these decay processes, a radioactive isotope, or radioisotope, transforms into a more stable atom.
AlBr3 + K2SO4 → KBr + Al2(SO4)3
What are the coefficients required to balance the chemical equation?
A) 1,3,6,1
B) 2,1,6,1
C) 2,3,1,1
D) 2,3,6,1
Answer: D
Explanation:
Based on the balanced equation of the reaction, the coefficients of the balanced equation are as follows; 2, 3, 6 and 1., option D.
What is the balanced equation of the reaction between aluminium bromide and potassium sulfate?The balanced equation of the reaction between aluminium bromide and potassium sulfateis given below:
2AlBr3 + 3 K2SO4 → 6KBr + Al2(SO4)3
Therefore, the coefficients of the balanced equation are as follows; 2, 3, 6 and 1.
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Find c for 455 grams of metal that gives off 1638 J while changing temperature by 6C.
Answer:
c = 0.6 J/g°C
Explanation:
Heat is given by the formula;
Heat = mass× specific heat capacity × change in temperature
Mass = 455 g
Heat = 1638 J
ΔT = 6 °C
Therefore;
1638 J = 455 g× c × 6
c = 1638/(455×6)
c = 0.6 J/g°C
An object with a mass of 120 kilograms is moving at a velocity of 30 m/s. What's its momentum?
A. 3,600 m/s/kg
B. 0.25 kg-m/s
C. 3,600 kg-m/s
D. 4 kg-m/s
I believe the correct answer is A
The momentum of the object is 3600 kg m/s.
Answer: Option C
Explanation:
Momentum is the measure of motion done by an object. It is a vector quantity. It is defined as measure of velocity at which object is moving. So the momentum is found to be directly proportional to product of mass (m) of the object and velocity attained by the object. Thus,
[tex]\text {Momentum of the object} = m \times \text { Acceleration }[/tex]
As the mass of the object is given as 120 kg and the velocity attained by the object is 30 m/s, then the momentum of the object will be
[tex]\text {Momentum of the object} = 120 \times 30 = 3600 \mathrm{kgm} / \mathrm{s}[/tex]
So, the momentum of the object is 3600 kg m/s.
Directions: WRITE a summary of the Newton’s Laws of Motion reading.
Your summary must correctly use the following academic language:
-Motion.
- inertia .
-acceleration interaction.
Answer:
In the Newton's first law of motion, a stationary body or that moving with uniform motion will only chnage its state if acted upon by other forces externally.This kind of resistance is caused by the force of inertia.In his second law of motion,when a body is acted by a force, the force will be equal to the product of mass and acceleration of the body.i.e F=ma. In the third law of motion, it explains that a body will exert an equal and opposite force when interacting with another body.Thus, every action force experiences an equal and opposite reaction force.Here the momentum of the bodies will be conserved.
A radioactive polonium sample has a half-life of 103 years. How much of a 100 g sample would remain after 412 years?
Answer:
6.25 g
Explanation:
The half-life of a radioactive isotope is the time needed for the mass of the sample to halve.
Here, we a radioactive polonium sample, whose half-life is
[tex]\tau_{1/2} = 103 y[/tex]
The mass of sample left after a time t is given by the equation
[tex]m(t) = m_0 (\frac{1}{2})^{t/t_{1/2})[/tex]
where
[tex]m_0 = 100 g[/tex] is the initial mass
[tex]\tau_{1/2} = 103 y[/tex] is the half-life
If we substitute t = 412 y , we find the mass of sample left:
[tex]m(t) = (100 g) (\frac{1}{2})^{412 y/103 y}=(100 g)(\frac{1}{2})^{1/4}=6.25 g[/tex]
After 412 years, approximately 6.25 grams of a 100 gram polonium sample would remain, given a half-life of 103 years.
Explanation:The subject matter in this question concerns the half-life of radioactive polonium. A half-life is the time it takes for half of a sample of a radioactive substance to decay. For polonium, this is stated to be 103 years.
Given that the half-life of polonium is 103 years, a 100 g sample would reduce to half its size (50 g) after 103 years. After another 103 years (206 years total), this 50 g would reduce by half again to 25 g. After 309 years, the sample would half again, leaving 12.5 g. Finally, after 412 years (or roughly 4 half-lives), the remaining amount of the initial sample would be half of 12.5 g, which is 6.25 g.
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The water pressure at the bottom of the Marianas Trench is approximately 1,100 kPa. With how much force would the water pressure at the bottom of the Marianas Trench push on a fish with a surface area of 0.50 m^2?
Answer:
550 kN
Explanation:
Force is equal to pressure times area.
F = AP
F = (0.50 m²) (1,100,000 Pa)
F = 550,000 N
F = 550 kN
life cycle of a medium mass star
Our sun is a medium mass star, so it wouldn't be too different from the sun's life cycle. It is born, lives for about 10 billion years and then dies. ... As a medium mass star nears the end of its life, it runs out of hydrogen which it has been fusing onto helium in its core for its whole life.
how do you know gravitational force used by Earth on objects makes objects fall down?
Answer:
When you throw something up like a glass cup for example, it falls down and breaks, that is because of gravitational force
Explanation:
THE CUP BREAKS BECAUSE OF THE DOWN FORCE
how do you draw two vectors to represent two forces that balance each other?
If two forces "balance" each other, that means that they add up to zero.
THAT means that they must have exactly equal magnitudes and exactly opposite directions.
If you want to draw a picture of a pair of two balanced force vectors . . . .
1). Draw two arrows with exactly the same length.
2). Flip one of them over, so that it points in exactly the opposite direction compared to the first one.
3). Place them tail-to-tail.
When a state legislature or the U.S. congress passes an act into law, it generally becomes known as which
*statute
. ordinance
. appointment
. executive order
Answer:
the answer is . d
Explanation:
the answer is A.Statute
A book falls off a shelf that is 10.0 m tall. What is the velocity at which the book hits the ground?
Answer:
14 m/s
Explanation:
The motion of the book is a free fall motion, so it is an uniformly accelerated motion with constant acceleration g=9.8 m/s^2 towards the ground. Therefore we can find the final velocity by using the equation:
[tex]v^2 = u^2 + 2gd[/tex]
where
u = 0 is the initial speed
g = 9.8 m/s^2 is the acceleration
d = 10.0 m is the distance covered by the book
Substituting data, we find
[tex]v=\sqrt{0^2 + 2(9.8 m/s^2)(10.0 m)}=14 m/s[/tex]
When the mass of the cylinder increased by a factor of 3, from 1.0 kg to 3.0 kg, what happened to the cylinder’s gravitational potential energy? It decreased by a factor of 3. It decreased by a factor of 2. It increased by a factor of 2. It increased by a factor of 3.
Answer:
It increased by a factor of 3.
Explanation:
The gravitational potential energy of an object is given by
[tex]U=mgh[/tex]
where
m is the mass
g is the gravitational acceleration
h is the heigth of the object relative to some reference point (for instance, the ground)
As we see from the formula, the gravitational potential energy is directly proportional to the mass, m: therefore, if the mass of the cylinder is increased by a factor 3, then the gravitational potential energy will also increase by a factor 3.
Answer:
It increased by a factor of 2.
Explanation: