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Physics
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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...

DS
Answered by Dan S. Physics tutor
10898 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)...

BL
Answered by Ben L. Physics tutor
3164 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...

JA
Answered by Jagan A. Physics tutor
13857 Views

Why does a balloon 'stick' to a wall when one has rubbed it on one's head?

When the balloon is rubbed on your head, it becomes electrostatically charged (this is because electrons are transfered to/from the balloon from/to your hair). When you bring the balloon, which now has an...

RH
Answered by Ryan H. Physics tutor
23900 Views

What is terminal velocity?

Terminal velocity occurs when an object in free fall doesn't accelerate any further. As F=ma, when a = 0, F must be 0. F in this equation refers to resultant force. Because all objects in earth's gravity ...

VN
Answered by Vedanth N. Physics tutor
4894 Views

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