1. An object with a mass of m is thrown straight up near the surface of the earth. While the object is going up, the net force o
1 answer:
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when the ball hits the floor and bounces back the momentum of the ball changes.
the rate of change of momentum is the force exerted by the floor on it.
the equation for the force exerted is
f = rate of change of momentum
v is the final velocity which is - 3.85 m/s
u is initial velocity - 4.23 m/s
m = 0.622 kg
time is the impact time of the ball in contact with the floor - 0.0266 s
substituting the values
since the ball is going down, we take that as negative and ball going upwards as positive.
f = 189 N
the force exerted from the floor is 189 N
Answer: 259.2 KJ
Explanation:
The formula calculate work don in a circuit is given by :-
, where Q is charge and V is the potential difference.
The formula to calculate charge in circuit :-
, where I is current and t is time.
Given : Current :
Potential difference :
Time :
Now,
Then,
Hence, the work done = 259.2 KJ
- Mass=m=1kg
- Height=h=2cm=0.02m
- Acceleration due to gravity=g=10m/s^2