SATHEE: Properties Of Solids And Liquids Question 573

Properties Of Solids And Liquids Question 573

Question: A block of mass 100 gm slides on a rough horizontal surface. If the speed of the block decreases from 10 m/s to 5 m/s, the thermal energy developed in the process is

Options:

A) 3.75 J

B) 37.5 J

C) 0.375 J

D) 0.75 J

Show Answer

Answer:

Correct Answer: A

Solution:

According to energy conservation, change in kinetic energy appears in the form of heat (thermal energy). $\Rightarrow$ i.e. Thermal energy $= \frac{1}{2} m (v_{1}^{2} - v_{2}^{2})$

$[∵ \underset{(Joule)}{W} = \underset{(Joule)}{Q}]$

$= \frac{1}{2} (100 \times 10^{- 3}) (10^{2} - 5^{2}) = 3.75 J$

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Properties Of Solids And Liquids Question 573

Question: A block of mass 100 gm slides on a rough horizontal surface. If the speed of the block decreases from 10 m/s to 5 m/s, the thermal energy developed in the process is

Options:

Answer:

Solution:

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