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Topic - force as rate of change of momentum; (i) force on a wall due to water from a hose, (ii) force on a table as a rope is dropped onto it.

The question starts with a simple calculation that illustrates how a force can be calculated as the rate of change of momentum. It should be understood by most students; however, the answer can then be used ...
Answered by • Physics tutor
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Describe a simple experiment to determine the speed of sound in air.

One method to measure the speed of sound would require two people, a large open space, a starting pistol that produces smoke instantaneously when fired, a stopwatch and a tool to measure long distances (e.g....
AE
Answered by Alex E. • Physics tutor
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How do I convert between eV and J

eV means electron volt - that is, it the amount of energy required for an electron to travel down (or up) a potential gradient with a potential difference of 1V. This energy, known as the work done, W, is gi...
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A ball is thrown at a speed of 15m/s at a 30 degree angle from the floor, how far does this ball travel before hitting the ground? (Air resistance can be ignored)

The key to answering this question is to separate the velocity of the ball into two components - horizontal and vertical components. The vertical component will be affected by the gravitational acceleration ...
LB
Answered by Leonardo B. • Physics tutor
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Explain the difference between speed and velocity.

Speed is the rate of change in direction, whereas velocity is the rate of change in displacement. This means that an object's velocity has an associated direction whereas its speed doesn't.If a car travells ...
MC
Answered by Mark C. • Physics tutor
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