When we stretch a spring, which two factors affect how much elastic
potential energy is stored in it

Answer:

c

Explanation:

The amount of mass used up in holding a nucleus together the mass defect represent.

Thus, The term "mass defect" refers to the discrepancy between the actual atomic mass and the expected mass obtained by multiplying the mass of the protons and neutrons in the nucleus by a constant factor.

The anticipated mass obtained by combining the masses of the nucleons is less than the actual atomic mass. The binding energy that is produced when a nucleus forms accounts for this extra mass.

The mass defect is a result of some of the mass being converted to energy during the formation of a nucleus. The real mass of an atomic nucleus is therefore less than the mass of the constituent particles.

Thus,  The amount of mass used up in holding a nucleus together the mass defect represent.

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The critical angle of the transparent material is 35.3 degrees.

The critical angle is the angle of incidence at which the angle of refraction is 90 degrees. In this case, the angle of refraction is 32 degrees. Therefore, the critical angle is calculated as follows:

sin(critical angle) = sin(90 degrees) / sin(angle of refraction)

sin(critical angle) = 1 / sin(32 degrees)

sin(critical angle) = 0.574

critical angle = arcsin(0.574)

critical angle = 35.3 degrees

Therefore, the critical angle of the transparent material is 35.3 degrees.

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The wolf's kinetic energy is 2,500 joules, calculated using the formula KE = 0.5 × mass × velocity².

The kinetic energy of an object is the energy it possesses due to its motion.

It can be calculated using the formula KE = 0.5 × mass × velocity², where KE represents kinetic energy, mass is the object's mass in kilograms, and velocity is its speed in meters per second.

In this case, the mass of the wolf is 50 kg, and its velocity is 10 m/s.

Plugging these values into the formula, we get KE = 0.5 × 50 × (10)², which simplifies to KE = 0.5 × 50 × 100.

Therefore, the wolf's kinetic energy is 2,500 joules.

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When the pedaling cyclist uses a generator (dynamo) to light his bicycle lamp, the energy change is from mechanical to electrical.

The law of conservation of energy states that energy can neither be created nor destroyed but can be converted from one form to another.

Thus, we can conclude the following as it relates to energy changes;

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The incline angle should be about 4.7 degrees and the block's acceleration would be greater than that of the rolling sphere.

a) Let M be the mass of the sphere, R be its radius, and θ be the incline angle. When the sphere rolls down the incline without slipping, the friction force acting on it causes a torque about its center of mass, which results in a rotational acceleration. If a is the linear acceleration of the center of mass, and α is the angular acceleration, then we have:

a = α R

Also, the torque τ caused by the friction force is given by:

\(τ = I α\)

where I is the moment of inertia of the sphere about its center of mass. For a solid sphere, I is given by:

\(I = (2/5) M R^2\)

Since the sphere rolls without slipping, the friction force is related to the normal force N by:

\(f = μ N\)

where f is the friction force, and μ is the coefficient of static friction. The normal force is related to the weight of the sphere by:

N = M g cos θ

where g is the acceleration due to gravity.

The net force acting on the sphere down the incline is given by:

\(Fnet = M g sin θ - f\)

The linear acceleration of the center of mass is given by:

\(a = Fnet / M\)

Substituting for f and N, we get:

\(a = g (sin θ - μ cos θ)\)

Equating this to α R, we get:

g (sin θ - μ cos θ) = α R

Substituting for α using the expression for I and τ, we get:

\(g (sin θ - μ cos θ) = τ / (2/5 M R)\)

Substituting for τ using the expression for f and N, we get:

\(g (sin θ - μ cos θ) = (μ M g cos θ) R / (2/5)\)

Simplifying, we get:

\(tan θ = (5/7) μ\)

Substituting the given values, we get:

tan θ = (5/7) (0.23)

\(θ = arctan(0.082)\)

θ = 4.7 degrees (approximately)

Therefore, the incline angle should be about 4.7 degrees

b) Since the block is frictionless, its acceleration down the incline is given by:

a' = g sin θ

Substituting the value of θ obtained in part a), we get:

a' = g sin(4.7) ≈ 0.41 g

Since this is greater than 0.23g, the block's acceleration would be greater than that of the rolling sphere.

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Answer:

V = -0.4 m/s

Explanation:

Given that,

Mass of cart 1, m₁ = 3 kg

Speed of cart 1, v₁ = 2 m/s

Mass of cart 2, m₂ = 2 kg

Speed of cart 2, v₂ = -4 m/s (left)

aWe need to find the velocity of the carts after the collision if they stick together. Let the common speed be V. Using the law of conservation of momentum to find it such that,

\(m_1v_1+m_2v_2=(m_1+m_2)V\\\\V=\dfrac{m_1v_1+m_2v_2}{(m_1+m_2)}\)

Put all the values,

\(V=\dfrac{3\times 2+2\times (-4)}{(3+2)}\\\\=-0.4\ m/s\)

So, the velocity of the carts after the collision is equal to 0.4 m/s to the left.

Answer:

90,000 meters

Explanation:

75*1200 = 90,000

Answer:

\(4ms^{-2}\)

Explanation:

F = ma

Rearrange to get acceleration on its own:

a = \(\frac{F}{m}\)

Substitute 20 for F and 5 for m:

a = \(\frac{20}{5}\) = 4 meters/second/second

The final velocity of the ball after 4s will be 5.25m/s2.

Velocity of a body is its speed and the direction in which it is moving.

Velocity is the directional speed of an object in motion as an indication of its rate of change in position as observed from a particular frame of reference and as measured by a particular standard of time (e.g. 60 km/h northbound).

It can also be described as the instantaneous rate of change of the body's distance traveled, and the direction in which the distance is changing.

Velocity is a vector quantity as it has both magnitude and direction.

From the question;

displacement, s = 21m

time = 4s

Velocity = displacement / time

Velocity = 21/4

Velocity = 5.25m/s2

Hence, the ball would move with a velocity of 5.25m/s2.

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Space telescopes must be placed in orbit around earth in order to observe short-wavelength radiation.

A telescope is an optical instrument that uses lenses, curved mirrors, or a combination of both to watch distant objects.

When atoms in a gas reach this temperature, they travel so quickly that when they collide, they release X-ray photons with wavelengths smaller than 10 nanometers.

Because the Earth's atmosphere prevents all X-rays from space, these wavelengths must be seen using space telescopes.

To study short-wavelength radiation, space telescopes must be put in orbit around the Earth.

Hence, space telescope is the correct answer.

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The speed of your friend during the circular distance is 2 times greater than your speed.

The distance you travelled and the distance travelled by your friend during one rotation is calculated as follows;

your circular distance = 2πr

where;

your distance = 2π(4 m) = 8π m

your friend's circular distance = 2πd

where;

your friends distance = 2π(8 m) = 16π m

The speed of each person at equal time is calculated as;

v = distance / time

your speed = 8π/t

your friend's speed = 16π/t = 2(8π/t)

Thus, your friend's speed = 2 times your speed.

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Answer:

Mostly real

Explanation:

Concave mirrors can have real images.

“ If the object is further away from the mirror than the focal point, the image will be upside-down and real meaning that the image appears on the same side of the mirror as the object.”

The image produced by a concave mirror is  virtual or real.

When a hollow sphere's inside surface serves as the reflecting surface and the cut part's outside is painted, the result is a mirror. The term "concave mirror" refers to this kind of mirror.

Concave mirrors have certain characteristics.

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The biggest problem posed by burning fossil fuels is the emission of greenhouse gases, primarily carbon dioxide, which contributes to global climate change.

Fossil fuels, such as coal, oil, and natural gas, are non-renewable sources of energy that have been widely used for centuries. However, the combustion of these fuels releases carbon dioxide and other greenhouse gases into the atmosphere, which trap heat and contribute to global climate change.

The resulting impacts of climate change, such as rising sea levels, more frequent and severe weather events, and the spread of diseases, have serious environmental, economic, and social consequences. Therefore, finding alternatives to fossil fuels, such as renewable energy sources like solar, wind, and hydropower, is crucial to mitigate the effects of climate change and ensure a sustainable future.

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Answer:

The group number indicates the number of valence electrons specific to the group, which is directly related to the number of electrons lost or gained while forming a compound.

Explanation:

What is an element's oxidation number?
The oxidation number of an element is the total number of electrons that an atom either gains or loses in order to form a chemical bond with another atom.

The group number indicates the number of valence electrons specific to the group, which is directly related to the number of electrons lost or gained while forming a compound. For example, group 1 metals are always +1 and group 2 metals are always +2.

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This is due to the fact that occluded fronts combine two cold air masses, which causes one of the cold air masses to go downward.

When a warm air mass is sandwiched between two cold air masses, an occluded front occurs. In an occlusion, the warm front passes over the cold front, which dives beneath it.

In a front is obscured, the warm front is fully supplanted by the cold front, in which the warm air masses have completely disappeared. Furthermore, there are frequent shifts in the various weather producing circumstances because of the cold front's relatively low temperature.

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True - the iris, or the colored part of your eye, controls the amount of light passing through. from there, it then hits the lens. this is the clear structure inside the eye that focuses light rays onto the retina.

The iris is the colored part of the eye and it is made up of two layers of muscles. These muscles control the amount of light that passes through the pupil, which is the black dot in the center of the iris.

The iris opens and closes to allow more or less light to enter the eye. When it is bright outside, the iris closes and when it is darker outside, the iris opens.

The light that passes through the pupil then hits the lens. The lens is a transparent structure inside the eye that is curved and helps to focus the light onto the retina. The lens is flexible and can change shape to help focus the light.

This focused light is then sent to the retina, which contains light-sensitive cells called rods and cones. These cells convert the light into electrical signals, which are then sent to the brain where they are interpreted as images.

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The most significant change in the comet's energy as it moves from point D to point A, assuming total mechanical energy is conserved, is that  KE increases, GPE decreases.

Therefore option A is correct.

COMET is  described as a technologically detailed linear optimization model of the city-scale energy system.

We notice from the diagram that as the comet moves from point D to point A, its speed increases and we have the knowledge that kinetic energy is directly proportional to the square of the velocity, the increase in speed leads to an increase in kinetic energy.

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Answer:

loop

Explanation:

a. The centripetal acceleration of the car is 0.5 m/s².

b. The centripetal force on the car is 600 N.

c. The coefficient of static friction between tires and the road is 0.051.

d. The car's speed is doubled, we need a coefficient of static friction of 0.204 to prevent the car from sliding.

a. The formula for the centripetal acceleration of the car is given as below:

ac = v²/r

where ac is the centripetal acceleration,

v is the speed, and

r is the radius of curvature of the circular path.

Substituting the values given in the problem, we get:

ac = (20 m/s)²/800 m = 0.5 m/s²

b. The formula for the centripetal force of the car is given as below:

F = mac

where F is the centripetal force,

m is the mass of the car, and

ac is the centripetal acceleration.

Substituting the values given in the problem, we get:

F = (1200 kg)(0.5 m/s²) = 600 N

c. The formula for the maximum static frictional force is given as below:

\(f_{max}\) = μsN

where \(f_{max}\) is the maximum static frictional force,

μs is the coefficient of static friction, and

N is the normal force acting on the car.

For a car moving in a circular path, the normal force is equal to the weight of the car, which is given by:

N = mg

where m is the mass of the car and g is the acceleration due to gravity (9.8 m/s²).

Substituting the above equations and solving for μs, we get:

\(f_{max}\) = μsN

⇒ μs = \(f_{max}\) / N

Substituting the values given in the problem, we get:

\(f_{max}\) = mac = (1200 kg)(0.5 m/s²) = 600 N and

N = mg = (1200 kg)(9.8 m/s²) = 11760 N

Therefore,μs = 600 N/11760 N = 0.051

d. Doubling the speed of the car will cause the centripetal acceleration to double as well.

The formula for centripetal acceleration is given as:

ac = v²/r,

where ac is the centripetal acceleration,

v is the speed, and

r is the radius of curvature of the circular path.

Substituting the new speed (40 m/s) into this formula, we get:

ac = (40 m/s)²/800 m = 2 m/s²

Therefore, the new centripetal acceleration is 2 m/s².

Using the same formula as in part (c), we can find the new coefficient of static friction.

The maximum static frictional force is still equal to the centripetal force, which is given by:

F = mac = (1200 kg)(2 m/s²) = 2400 N

Therefore,

μs = \(f_{max}\)/N = 2400 N/11760 N = 0.204

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Answer: D

Explanation:

Due to the fact that force equals the time rate of change of momentum (F = d p/dt), both balls take the same amount of time to come to rest. If we apply the same force and both balls start off with the same momentum, stopping them will take the same amount of time.

What is momentum ?

momentum is the result of a particle's mass and velocity. Being a vector quantity, momentum possesses both magnitude and direction. According to Isaac Newton's second equation of motion, the force applied on a particle is equal to the time rate of change of momentum. Check out Newton's laws of motion.

According to Newton's second law, if a particle is subjected to a constant force for a specific amount of time, the result of the force and time (referred to as the impulse) is equal to the change in momentum. On the other hand, a particle's momentum represents the length of time needed for a consistent force to bring it to rest.

Due to the fact that force equals the time rate of change of momentum (F = d p/dt), both balls take the same amount of time to come to rest. If we apply the same force and both balls start off with the same momentum, stopping them will take the same amount of time.

Because the ping-pong balls' momenta (p = m .v) are equivalent, the ball with the greater velocity has the greater kinetic energy, hence stopping it requires a greater distance. The ping-pong ball must have more kinetic energy because it travels faster than the bowling ball despite having a smaller inertial mass. This implies that the ping-pong ball requires more work than the bowling ball. Because work is the product of force and displacement (W = F.D, where force for both balls is assumed to be equal), or because work is directly proportional to displacement, the distance needed to stop a ping-pong ball is higher than one for a bowling ball.

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a)It is possible for the magnetic force on a charge moving in a magnetic field to be zero. The force acting on the charge is zero when a charge is moving in the same or opposite direction of the magnetic field.  When a is charge moving parallel in the same direction of the magnetic field, then the magnetic force  is zero.

b)It is not possible for the electric force on a charge moving in an electric field to be zero. If there's a charged particle in a magnetic field, it's impossible for this force to become zero.

c)It is not possible for the resultant of the electric and magnetic forces on a charge moving simultaneously through both fields to be zero. The magnetic force can be zero but the electric force cannot be zero because it is not affected by the motion of the particles.

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If iodine and starch diffuses, a blue black color is observed on the other side.

Diffusion refers to the movement of a substance from a region of higher concentration to a region of lower concentration across a concentration gradient.

We can know that iodine has diffused across the dialysis tubing when we observe a brown color across the other side. If iodine and starch diffuses, a blue black color is observed on the other side.

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Answer:

Ice cube, molecules, melting, zero degrees, liquid, faster, temperature, 100 degrees, steam

Answer:

lol you got the answer just need points sorry

Explanation:

Answer:

B or D

Explanation:

I wanna say B but I don't really know if it's a trick question

my explanation for D is that anvils are usually 110 decibles and ear drums usually are damaged when exposed to 82dbs or higher at a consistant rate so I'd imagine that'd be the answer I hoped this helped

Answer:

the answer is B

Explanation:

Any harmful noises can be bad. yes, an Anvil and Hammer can be bad but so can explosions and gun fire and having music to loud

Answer:

Aluminium and chlorine

Explanation: