8. An airplane is flying at 200 m/s when it touches the ground at the airport. It has a constant negative acceleration, and slow
1 answer:
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Answer:
Hits per second=199 hit/s
Explanation:
#Given the angular velocity, , radius of the record
and the distance between any two successive bumps on the groove as
.
The linear speed of the record in meters per second is:
#From above, if the bumps are uniformly separated by 1m, then the rate at which they hit the stylus is:
Hence the bumps hit the stylus at around 199hit/s
Answer:
The height is 3.1m
Explanation:
Here we have a conservation of energy problem, we have a conversion form eslastic potencial energy to gravitational potencial energy, so:
then we have only gravitational potencial energy when the ball is at its maximun height.
because all the energy was transformed Eg=Ee
searching the web, the mass of a ping pong ball is 2.7 gr in average. so: