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A student of mass m=50kg runs an experiment. He throws a ball of mass m = 400g from a height h = 20m. What will be the speed of the ball he records just before it touches the ground?

First, we need to see what the important information in this problem is: the mass of the student is irrelevant as the problem focusses on the ball. So we now know that the important information is: m = 400g ...
MM
Answered by Martina M. • Physics tutor
2332 Views

If a car has a mass of 670kg and has a driving force of 1200N and a force from resistance of 300N, what is the acceleration of the car? What is the speed of the car after 5 seconds?

The force of resistance should be taken away from the driving force to result in a total force of 900N driving forwards.Then use F=ma, rearranged so that a = F/m, to result in an acceleration of 1.34 m/s^2. ...
CA
Answered by Cameron A. • Physics tutor
3342 Views

Describe the energy transfers taking place when a person is running up a hill

Stored chemical energy from food is converted into kinetic energy (ke) as the person runs. As they are running uphill, the chemical energy is also converted into gravitational potential energy (gpe). The gpe...
AT
Answered by Amy T. • Physics tutor
27410 Views

What is the power dissipated by a 12 Ohm resistor when 2A of current run through it?

We know P=IV and that V=IR. Therefore as we are only given I and R in the question we can make the substitution for V so that P=I 2 R. By plugging in the numbers we get: P=2 2 x 12= 48W (W=Watts, unit of Power)
OT
Answered by Ollie T. • Physics tutor
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Coal is a non-renewable energy resource. Name two other non-renewable energy resources.

oil and gas
KY
Answered by Kieran Y. • Physics tutor
2880 Views