Top answers

Physics
A Level

Calculate the kinetic energy of a car of mass 1.0*10^3kg moving at speed of 20ms^-1.

By using the equation: Kinetic Energy = (1/2)mv^2, using m as 1000kg and v as 20ms^-1.We can calculate this value as follows: KE = (1/2)(1000)(20)^2This is equal to 2.0*10^5J (solved using a scientific ca...

RH
Answered by Robin H. Physics tutor
8437 Views

Why is an object moving in a circle at a constant speed said to be accelerating?

First of all, it is important to remember that an object's acceleration is the rate of change of its velocity, not its speed. Velocity is a vector quantity and so must have a direction as well as a magnit...

SG
Answered by Sam G. Physics tutor
15811 Views

Explain how an acceleration-displacement graph could be used to determine the frequency of oscillation of a metal plate.

Acceleration (A)= Angular Velocity2 (w2)Displacement (x)Angular Displacement= 2piFrequency (f)Gradient= A/x = w2 = [2pi*f]2Rearrange the equation to g...

TO
Answered by Tise O. Physics tutor
8771 Views

Explain how a standing wave is set up on a string fixed at both ends.

An oscillation is send down the string which is reflected at the other end. This leads to the superposition of two waves, the transmitted and reflected wave, on the string. At the ends, where reflection o...

PS
Answered by Peter S. Physics tutor
6195 Views

Why does temperature effect the resistance of conductors?

The resistance of a conductor increases with temperature. This is because as the temperature increases the atomic lattice of the conductor has more energy so begins to vibrate more. This means it is more ...

PE
Answered by Peter E. Physics tutor
34257 Views

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