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Q. 16

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Physics for Scientists and Engineers: A Strategic Approach with Modern Physics
Found in: Page 1082

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Short Answer

Express in (or or if more appropriate):

a. The kinetic energy of a Li ++ ion that has accelerated from rest through a potential difference of .

b. The potential energy of two protons apart.

c. The kinetic energy, just before impact, of a ball dropped from a height of .

a. The potential energy of two protons is.

b. The potential energy of two protons is.

c. The kinetic energy just before impact is.

See the step by step solution

Step by Step Solution

Part (a) step 1: Given information

We have given that express in

We need to find the kinetic energy of a Li ++ ion that has accelerated from rest through a potential difference of

Part (a) step 2: Simplify

Ion has charge. As it is accelerated through the the total energy will be

Part (b) step 2: Given information

We have given that express in

We need to find the potential energy of two protons apart.

Part (b) step 2: Simplify

Potential energy is given as

Part (c) step 1: Given information

We have given that express in

We need to find the kinetic energy, just before impact, of a ball dropped from a height of n

Part (c) step 2: Simplify

The kinetic energy just before hitting the ground will be equal to the potential energy and is equal to . Here and .So energy will be

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