A sprinter has a mass of 80 kg and a kinetic energy of 2500 J. What is the sprinter's speed?
1 answer:
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Answer:
The distance covered by the lighting flash is 1700 meters.
Explanation:
Given that,
The speed of sound travels in air at a speed of about 340 meter second, v = 340 m/s
The sound of thunder is heard 5 seconds after the flash of lightning is seen, t = 5 s
To find,
The distance far away was the lightning flash.
Solution,
The distance covered by the lighting flash is given by the product of speed and time. It is given by :
d = 1700 meters
So, the distance covered by the lighting flash is 1700 meters. Therefore, this is the required solution.
Answer:
The the recoil velocity of the hunter is 0.056 m/s in opposite direction of the bullet.
Explanation:
Given;
mass of bullet, m₁ = 4.2 g = 0.0042 kg
mass of hunter + gun = 72.5 kg
velocity of the bullet, u = 965 m/s
Momentum of the bullet when it was fired;
P = mv
P = 0.0042 x 965
P = 4.053 kg.m/s
Determine the recoil velocity of the hunter.
Total momentum = sum of the individual momenta
Total momentum = momentum of the bullet + momentum of the hunter
Apply the principle of conservation of momentum, sum of the momentum is equal to zero.
Therefore, the the recoil velocity of the hunter is 0.056 m/s in opposite direction of the bullet.