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2 years ago

Which is an example of the gravitational force?

Physics

2 answers:

Evgesh-ka [11]2 years ago

7 0

1. A basketball was thrown in the air and falls to the ground

Sergeeva-Olga [200]2 years ago

6 0

Answer:

1.a basketball that was thrown in the air falls to the ground

Explanation:

1.a basketball that was thrown in the air falls to the ground

From newton law of universal gravitation, it state that a object of any mass will have the tendency to come down when throw to the atmosphere.

this is the reason why acceleration due to gravity of any object thrown up are always the same. Acceleration due to gravity on earth is 9.8 m/s2.

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2 years ago

4. A car of mass 1200 kg travelling at 20 m/s brakes and comes to rest in 4

rjkz [21]

The car has an average acceleration of

$a_{\rm ave} = \dfrac{\Delta v}{\Delta t} = \dfrac{0\frac{\rm m}{\rm s} - 20\frac{\rm m}{\rm s}}{4\,\mathrm s} = -5\dfrac{\rm m}{\mathrm s^2}$

Then, by Newton's second law, the average force exerted by the brakes on the car is

$F_{\rm ave} = ma_{\rm ave} = (1200\,\mathrm{kg})\left(-5\dfrac{\rm m}{\mathrm s^2}\right) = \boxed{-6000 N}$

which is to say, the average force has a magnitude of 6000 N and is directed opposite the car's motion.

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2 years ago

Jenny got a balloon at a party. When she squeezes the balloon, she can squish the air inside it and change the shape of the ball

vesna_86 [32]

It is a physical change because you are not changing it chemicaly

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3 years ago

Read 2 more answers

Two cars are moving. The first car has twice the mass of the second car but only half as much kinetic energy. When both cars inc

Leno4ka [110]

Let m be the mass of the second car, so the first car's mass is 2m.

Let K be the kinetic energy of the second car, so the first car's kinetic energy would be K/2.

Let u and v be the speeds of the first car and the second car, respectively. At the start,

• the first car has kinetic energy

K/2 = 1/2 (2m) u ² = mu ² ==> K = 2mu ²

• the second car starts with kinetic energy

K = 1/2 mv ²

It follows that

2mu ² = 1/2 mv ²

==> 4u ² = v ²

When their speeds are both increased by 2.76 m/s,

• the first car now has kinetic energy

1/2 (2m) (u + 2.76 m/s)² = m (u + 2.76 m/s)²

• the second car now has kinetic energy

1/2 m (v + 2.76 m/s)²

These two kinetic energies are equal, so

m (u + 2.76 m/s)² = 1/2 m (v + 2.76 m/s)²

==> 2 (u + 2.76 m/s)² = (v + 2.76 m/s)²

Solving the equations in bold gives u ≈ 1.95 m/s and v ≈ 3.90 m/s.

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2 years ago

Neglecting air resistance, if you throw a ball straight up with a speed of 20 m/s how fast will it be moving when you catch it

arsen [322]

The same speed, 20 m/s, because the energy is conserved. It changes from kinetic to gravitational potential and back again to the exact same kinetic energy.

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3 years ago