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A rollercoaster carriage wants to go up a slope of length 10m at an angle of 30 degrees above the horizontal, at what speed must the carriage be travelling at the bottom of the slope in order for it to reach the top? (Negligable Drag)

10m/s
PW
Answered by Peter W. • Physics tutor
1757 Views

Does kinetic friction always oppose the direction of motion?

No it does not. In some cases friction can cause motion. To illustrate this we will consider a body M 1 of length L placed on a frictionless surface and a smaller body M 2 placed on top of M 1 on the leftmos...
SA
Answered by Stella A. • Physics tutor
5898 Views

Describe how the control rods in a nuclear reactor are used to regulate nuclear fission in a nuclear reactor.

A control rod is a device that can be used to absorb neutrons released from nuclear fission. They can be used to slow down or completely stop a reaction by lowering them or raising them into the reactor cham...
LJ
Answered by Laurie J. • Physics tutor
3343 Views

Describe an experiment to determine the spring constant of a spring? Your answer should include any causes of inaccuracy.

A clamp and stand should be used to hold the spring in place. Ensure its parallel to the stand using a ruler, this reduces the effect of random parralax error when measuring extension.Masses should be attach...
AR
Answered by Andrew R. • Physics tutor
13495 Views

Explain why the nuclear model of the atom replaced the plum pudding model of the atom?

Rutherford performs the alpha particle scattering experiment. Alpha particles incident on a gold foil in a vaccum are scattered by a range of angles, due to the electrostatic repulsion between the positively...
AR
Answered by Andrew R. • Physics tutor
8391 Views