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Why does voltage increase (for a constant current) if temperature increases?

Voltage is directly proportional to resistant (V=IR) and resistance increases with temperature due to increased vibrations of the molecules inside the conductor. Therefore voltage increases as temperature in...
AH
Answered by Annie H. • Physics tutor
62333 Views

Could you please explain how does a general pulley system work and how I can solve problems associated with those?

Pulley systems allow for force transmission from one body to another or more. Intelligent pulley systems can be used to apply more force to a body of interest than that generated (by any power system or othe...
LR
Answered by Luca R. • Physics tutor
2166 Views

When catching a ball, a cricketer moves his hands for a short distance in the direction of travel of the ball as it makes contact with his hands. Explain why this technique results in less force being exerted on the cricketer's hands

As his hand moves back with the ball, the time taken to stop the ball is greater. This means that the rate of change of momentum is less (because the rate of him changing the speed of the ball is much slower...
LW
Answered by Lisa W. • Physics tutor
11848 Views

What does Newton's First Law mean?

Newton's First Law states that an object will continue moving at the same velocity in the same direction unless a resultant force acts upon it. This applies to stationary objects too - if an object is still ...
AH
Answered by Annie H. • Physics tutor
3044 Views

The electric potential energy of two protons is 1.0MeV. Calculate their separation

First thing first, we need to fully understand what we are asked and what topic we are being tested on. From this question, we can see that we are involved in electric fields, sicne we can see the "elec...
GK
Answered by George K. • Physics tutor
10941 Views