His velocity is 3 m/s in the direction in which he is running in. which.
Answer:
The diameter of the piston of the players equals 55.136 cm.
Explanation:
from the principle of transmission of pressure in a hydraulic lift we have

Since the force in the question is the weight of the individuals thus upon putting the values in the above equation we get

Solving for
we get

Its called static friction.
125 W is the power output of this machine.
Answer:
Explanation:
Power is defined as the amount of work done on the system to move that system from its original state within the given time interval. So it can be determined by the ratio of work done with time interval. As work done is the measure of force required to move a system to a certain distance. Work done is calculated as product of force with displacement.
So in the present case, the force is given as 100 N, the displacement is given as 5 m and the time is given as 4 s, then power is

As Work done = Force acting on the machine × Displacement
So 
Power =
=125 W
So, 125 W is the power output of this machine.
Answer:
remote control, neon and fluorescent lights, wireless transmission, computers, smartphones
Explanation: