What impulse was delivered to the sled by the friction force from the rough spot?
1 answer:
Answer:
- 80 Ns
Explanation:
The complete statement is given as
A sled and rider, gliding over horizontal, friction less ice at 4.0 m/s, have a combined mass of 80 kg. The sled then slides over a rough spot in the ice, slowing down to 3.0 m/s. What impulse was delivered to the sled by the friction force from the rough spot?
= initial velocity of the sled = 4.0 m/s
= final velocity of the sled = 3.0 m/s
= combined mass of sled and rider = 80 kg
= Impulse delivered to sled
Using Impulse-change in momentum equation, Impulse delivered to sled is given as
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Answer:
The angular acceleration is same at all the points in the body.
Option (D) is correct.
Explanation:
Given:
When a rigid body rotates about a fixed axis, all the points in the body have the same,
For finding which quantity is same we use pure rotational concept,
Where angular frequency,
radius of rigid body
When a rigid body rotates about a fixed axis angular velocity of all the points in the body are same.
But the tangential speed, tangential acceleration, linear displacement, and centripetal acceleration depend on the position of the points and hence they are not the same.
Therefore, the angular acceleration is same at all the points in the body.