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A runner of weight 588N runs at a speed of 8 miles/hr. What is the kinetic energy of the runner? Determine the power exerted by the runner over a distance of 10m.

KE = 1/2 m v^2m = 588/9.8 = 60 kgv = 8 miles/hr = 3.56 m/sKE = 379 JP = E/tt = d/v = 10m/3.56m/s = 2.81 sP = 135 W
ED
Answered by Eliza D. • Physics tutor
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In the Rutherford alpha scattering experiment, most particles passed straight through the foil with little or no deflection. What can be deduced about the structure of the atom from this?

Answer: Most of the atom's mass must be concentrated in a small area at the centre of the atom. This is known as the nucleus.
MR
Answered by Megan R. • Physics tutor
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Explain the difference between energy and power.

Power is the rate at which energy is transferred. For example, a typical kettle may use 1.2 kiloWatts (kW) for about 2 minutes to boil water. This means that the kettle uses 1200 Joules of energy per second ...
HJ
Answered by Henry J. • Physics tutor
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If an object of mass 6kg was dropped from a height 35m (initially at rest), how long would it take to reach the ground under free fall?

Free fall == only gravity actingUse one of the SUVAT equations: s = ut + 0.5at 2 s=35m, u=0 (starts at rest), a=g=9.81ms -2 (gravitational constant), t=?Through rearranging: t=(2s/a) 0.5 = 2.67 seconds
CA
Answered by Charlotte A. • Physics tutor
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Can you please explain the significance of photoelectric effect?

The photoelectric effect is the emission/removal of electrons, normally, from the surface of a metal. This is done as light is shone on the metal. This is a very useful proof that light can act as a particle...
KA
Answered by Khawaja A. • Physics tutor
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