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A nail of mass 7.0g is held horizontally and is hit by a hammer of mass 0.25kg moving at 10ms^-1. The hammer remains in contact with the nail during and after the blow. (a) What is the velocity of the hammer and nail after contact?

The principle necessary to answer this question is the conservation of linear momentum. This means that the sum of the momentum of the hammer and nail before impact must be equal to the total momentum of ...

Answered by Caroline S. • Physics tutor

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How does a capacitor work and how do I treat it in a circuit?

for a capacitor the equations you need to know are: Q=CV V=Vin*e^(t/RC) and E=1/2QV (with Q=charge/columbs, C= capacitance/Farads, V=voltage/volts, R=resitance/ohms, Vin=initial voltage when discharging...

Answered by Tom M. • Physics tutor

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Do heavy things fall faster than small things?

In a vacuum (ie in the absence of air resistance) all things fall with exactly the same acceleration. The reason for this can be easily seen.

An object, with mass ‘m’, falling in a gravitational fi...

Answered by Angus D. • Physics tutor

1760 Views

A crane is attached to one end of a steel girder, and lifts that end into the air. When the cable attached to the end of the girder is at 20 degrees to the vertical, the tension is 6.5kN. Calculate the horizontal and vertical components of this force.

6.1kN vertically up

2.2kN horizontally to the right

Answered by Alex R. • Physics tutor

2650 Views

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

1394 Views