Mark pushes his broken car 140 m down the block to his friend's house. He has to exert a 160 N horizontal force to push the car
1 answer:
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Answer:
(a)Magnitude=28.81 m/s
Direction=33.3 degree below the horizontal
(b) No, it is not perfectly elastic collision
Explanation:
We are given that
Mass of stone, M=0.150 kg
Mass of bullet, m=9.50 g=
Initial speed of bullet, u=380 m/s
Initial speed of stone, U=0
Final speed of bullet, v=250m/s
a. We have to find the magnitude and direction of the velocity of the stone after it is struck.
Using conservation of momentum
Substitute the values
Magnitude of velocity of stone
=
|V|=28.81 m/s
Hence, the magnitude and direction of the velocity of the stone after it is struck, |V|=28.81 m/s
Direction
=
=33.3 degree below the horizontal
(b)
Initial kinetic energy
Final kinetic energy
=
Initial kinetic energy is not equal to final kinetic energy. Hence, the collision is not perfectly elastic collision.
Answer:
3560.36 Watts
Explanation:
Power, where P is power, n is the number of skiers, t is time in seconds and Δt is change in time, ΔW is given by mgh where m is mass, g is gravitational constant, h is height
Substituting n for 4 skiers, m for 62.9 Kg, g for 9.81, h for 148 m and t for 1.71*60=102.6 seconds
P=
Average power is approximately 3560.36 Watts