WorksheetsWork, Power, Energy- Power, Collisions
Total questions: 8
Worksheet time: 19mins
Four students run up the stairs in the time shown. Which student has the largest power output?
A
B
C
D
A basketball that is dropped bounces back up to its original height. Pick the correct energy transformation from the point when it was dropped until it returns to the original height.
KE --> PE --> Elastic
PE --> KE --> Elastic --> KE --> PE
KE --> PE --> Elastic --> PE --> KE
Elastic --> PE --> KE --> Elastic
A large moving ball collides with a small stationary ball. The momentum
of the large ball decreases, and the momentum of the small ball increases.
of the small ball decreases, and the momentum of the large ball increases.
of the large ball decreases, and the momentum of the small ball decreases.
does not change for either ball.
What is the power of the engine when the velocity of the car is v, mass m, acceleration a, and external resistance R
(R-ma)v
(R+ma)v
mav
Rv
A ball is thrown from a height of 20 m vertically downward and has an initial velocity of v2 As the stone collides with the ground 50% of its energy is lost and bounce back to the same height. Its initial velocity is
28 m/s
20 m/s
14 m/s
4 m/s
What is the ratio of velocities of a nucleus that splits into two parts with radii 1:2
6:1
2:1
8:1
4:1
A cricket ball of mass 150 g moving with a speed of 126 km/h hits at the middle of the bat, held firmly at its position by the batsman. The ball moves straight back to the bowler after hitting the bat.Assuming that collision between ball and bat is completely elastic and the two remain in contact for 0.001s, the force that the batsman had to apply to hold the bat firmly at its place would be
10.5 N
21 N
1.05 ×104 N
2.1 × 104 N
A trolley of mass 300 kg carrying a sandbag of 25 kg is moving uniformly with a speed of 27 km/h on a frictionless track. After a while, sand starts leaking out of a hole on the floor of the trolley at the rate of 0.05 . The speed of the trolley after the entire sand bag is empty will
increase
remain same
insufficient information
decrease
