Sawaal
51
Q:

Skating on ice is possible because 

A) the surface of ice is smooth B) ice is cold
C) the pressure on the ice due to skate melts the ice by lowering its melting point forming a thin film of water D) the pressure on the ice due to skate raises its melting point

Answer:   C) the pressure on the ice due to skate melts the ice by lowering its melting point forming a thin film of water



Explanation:

Here is a case of  lowering of melting point of ice with increase of pressure

Subject: Physics
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As an object falls freely its ___________________.

 

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What is the standard room temperature in Kelvin?

 

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An object, starting from rest, moves with constant acceleration of 4 m/s2. After 8 s, its speed is

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1 watt is equal to 1 ____________

 

A) J s-1   B) J s
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A body is initially moving with a velocity of 10 m/s. It undergoes an acceleration of 2 m/s2 for 5 seconds. Find the displacement (in m) of this body in these 5 seconds.

 

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