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Thermal Expansion

Consider a bl...

Question

Consider a block of mass $10 k g$ which rests on a smooth surface and is subjected to a horizontal plane with a force of $6 N$ . If observer $A$ is in a fixed frame $x$ .

The final speed of the block in

4 s

7.4 m / s

, If it has an initial speed of

5 m / s

measured from the fixed frame.

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The same speed will be observed by observer

B

, attached to the

x

, axis that moves at a constant velocity of

2 m / s

relative to

A

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Principle of impulse and momentum is void for observers in any inertial reference frame.

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Momentum of a body is reference frame dependent.

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Solution

The correct options are
A Principle of impulse and momentum is void for observers in any inertial reference frame.
B The final speed of the block in $4 s$ is $7.4 m / s$ , If it has an initial speed of $5 m / s$ measured from the fixed frame.
D Momentum of a body is reference frame dependent.
Impulse=Change in momentum
$\Rightarrow 6 \times 4 = 10 (v - 5) \Rightarrow v = 7.4 m / s$
with respect to observer $B$ , speed will be $v - 2 = 7.4 - 2 = 5.4 m / s$
Principle of impulse and momentum is void for observers in any inertial reference frame.

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Consider a block of mass 10 kg which rests on a smooth surface and is subjected to a horizontal plane with a force of 6 N. If observer A is in a fixed frame x.

Consider a block of mass $10 k g$ which rests on a smooth surface and is subjected to a horizontal plane with a force of $6 N$ . If observer $A$ is in a fixed frame $x$ .