A swimmer sees a parachutist hit the water and hears the impact twice, once through the water and the second time through the air, 1.0 s later. How far from the swimmer did the impact occur?
Vs air = 340 m/s Vs water = 1400 m/s the answer is 450m
I don't understand what to do...
A lineman in football would need to develop a lot of power, in order to stop a running back from getting past him.
or
A quarterback would need to develop great power in order for him to throw the ball great distances.
Oh Thank you!
I had another quick question if you don't mind :shy:
Which sports require a person to a) generate a lot of force, b) do much work c) develop great power
(I used one sport/event)
a)A weight lifter, doing a dead lift of 105kg would require him/her to generate a lot of force...
Im sorry, but do you mean mechanical energy? To convert the chemical energy you would need a high metabolism? You would need strong muscles to convert that convert the energy into large forces?
I answered the questions(not sure if they are right) but I would like to know the best way to explain these questions on a test/quiz.
1) Describe the transfer of energy that enables a person to climb stairs.
I put: The person's body first uses the chemical energy from food/water as...
The acceleration is 1.02 and the friction force for all of the toboggans is 122.5N. The answer key says that (b) has to equal 130N again and (c) has to equal 50N again.
For (c) I did Fg=mg
Fg = (25)(-9.8)
Fg = -245N
so the Ff=(0.10)(245)
Ff= 24.5N...
Two toboggans are connected by a rope. The first toboggan has a mas of 60 kg and the second has a mass of 40 kg. The two toboggans are pulled by a rope connected to the first toboggan. If the force exerted on the rope is 250N [E], and friction between the toboggans and the ice and be ignored...