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A torch uses 15watts of energy. It uses two 1.5volt batteries connected in series. What is the resistance in the circuit of the torch?

In order to answer this question, we need a formula which relates resistance to voltage and power. We don't already know this formula, but can create it from two formulae we already know: P=IV & V=IR....

Answered by Hugo W. • Physics tutor

1772 Views

Could you explain the how an AC generator works?

Simply, a generator uses the rotation of a coil of wire in a magnetic field to produce electricity.

(The principle of electromagnetic induction/ faraday's law : Any change in the magnetic environm...

Answered by Alvira Rachel K. • Physics tutor

9880 Views

Give an example of a transverse and longitudinal wave.

Transverse wave - electromagnetic wave, waves on a string Longitudinal wave - sound wave, seismic P-waves

Answered by Daniel M. • Physics tutor

8638 Views

If a body is projected from the ground at the angle of 30 degrees to the horizontal with the initial velocity of 20 m/s, what maximum height and range is it going to reach?

It is possible to solve this using equations for projectile motion that can be found in the majority of formula booklets. However, since they are not always available, it is good to understand where they ...

Answered by Tomasz H. • Physics tutor

4565 Views

A spacecraft needs to be slowed down from a speed of 96m/s to 8.2m/s. This can be done by firing an object as the spacecraft is moving. If the mass of the spacecraft is 6730kg and the object is 50kg, calculate the velocity of the ejected object.

As we have there is object being fired out of the front of the spaceship we know the ship will have a lower velocity than before using the conversation of momentum. "The total momentum of a system is...

Answered by Ben Q. • Physics tutor

1730 Views