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why is it that When there is a small droplet on a phone the pixels of the screen can be seen

Given that the drop is small enough it produces a semi sphere on screen of liquid due to surface tension. This acts like a powerful convex lens for the light coming from pixels on the phone screen hence allo...
AN
Answered by Adithya N. • Physics tutor
2017 Views

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
1742 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
5875 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
3318 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
13477 Views