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A Level

What is the difference between a Scalar and a Vector?

A vector is any physical quantity which has a direction and a magnitude, whereas a scalar is a physical quantity that is not directional (magnitude only).

Answered by Alex R. • Physics tutor

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A block of ice slides down the full height from one side of a 1m high bowl and up the other side. Assuming frictionless motion and taking g as 9.81ms-2, find the speed of the block at the bottom of the bowl and the height it reaches on the the other side.

Using the law of conservation of energy, the potential energy of the block is transferred to kinetic energy as it slides down. KE [0.5mv²] = PE [mgh], v = √2gh v = √29.811 = 4.43 ms

Answered by Oluwatosin S. • Physics tutor

2242 Views

What is electromotive force (emf) and how can the emf of a battery be measured?

The electromotive force is the work done by a battery on the charge carriers to transport them across the entire circuit, per unit charge. It can be thought of as the specific energy given to the charge c...

Answered by Dan S. • Physics tutor

11611 Views

A projectile is launched from the ground at a speed of 40ms^-1 at an angle of 30 degrees to the horizontal, where does it land? What is the highest point the projectile reaches?

Since the SUVAT equations of motion act independently in the horizontal and vertical directions we can use the vertical equations to find the total time (the time when total vertical displacement is zero)...

Answered by Ben L. • Physics tutor

3324 Views

Can you explain the Work-Energy principle and how you can apply it in a simple situation such as a box sliding down a rough slope?

The Work-Energy principle states that the total work done on or by an object is equal to the total change in energy between the given initial and final states. This can be reworded to also say that the to...

Answered by Jagan A. • Physics tutor

14284 Views