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Aneli [31]
3 years ago
10

A ball thrown in to the air starts out with an initial upward velocity but eventually slows and stops before falling back to the

ground. Which of the following contributes the most to the change in the motion of the ball?Question 2 options: a) The initial force with which the ball was thrown b) The downward force of gravity c) The resistance against the atmosphere d) The increase of inertia.
Physics
1 answer:
Mashutka [201]3 years ago
8 0

Answer:

b) The downward force of gravity

Explanation:

The gravity force has the biggest influence on the deceleration of the ball because no matter how much force you applied on the ball, it will eventually go down again, according to newton's second law:

\sum F=m.a

right after you throw the ball, only the force exerted by the gravity will affect the ball (neglecting air resistance):

m.g=m.a\\a=g

so the object will eventually be going down again.

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The temperature of a sample of silver increased by 24.0 °C when 269 J of heat was applied. What is the mass of the sample?
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Answer:

Mass of the silver will be equal to 46.70 gram

Explanation:

We have given heat required to raise the temperature of silver by 24°C is 269 J , so \Delta T=24^{\circ}C

Specific heat of silver = 0.240 J/gram°C

We have to find the mass of silver

We know that heat required is given by

Q=mc\Delta T, here m is mass, c is specific heat of silver and \Delta T is rise in temperature

So 269=m\times 0.240\times 24

m = 46.70 gram

So mass of the silver will be equal to 46.70 gram

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