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Using the principle of the conservation of energy, calculate the maximum speed of a ball of 5.0kg that has been dropped from a height of 20m. (Given that the gravitational field strength is equal to 9.8N/kg)

Answer: 20ms^-1The gravitational potential energy before the ball is dropped is equal to mgh. This gives the ball a maximum gravitational potential energy of 5.0kg * 9.8N/kg 20m which is equ...

Answered by Charlie H. • Physics tutor

2809 Views

Given that a light ray enters a glass prism at angle of 50 degrees from the normal and is refracted to an angle of 30 degrees from the normal, calculate the speed of light in glass.
Answer: 1.9610⁸ms^-1.Snell's law tells us that n₁sin(x₁)= n₂ sin(x₂) where x is the angle of a light ray from the normal. Air can be as...
Answered by Charlie H. • Physics tutor
2178 Views

describe how a microwave oven works (EM waves + thermal physics)
microwaves are Electromagnetic waves with a wavelength in the order of 10^-6m (the prefix for 10^-6 is micro, just as 10^-3 is milli). these short wavelength waves have a high energy due to equation E=hc/...
Answered by Andrew E. • Physics tutor
2215 Views

A car of mass m is travelling at a speed v around a circular track of radius r banked at an angle θ. (a) What is the centripetal acceleration of the car? (b) What is the normal force acting on the car? (c) If θ = 45°, r = 1 km what is the maximum speed?
(a) The formula for the centripetal acceleration of an object undergoing circular motion at a radius r and speed v is a = v^2/r so as F = ma the centripetal force is F = mv^2/r. 2 marks By...
Answered by Jack M. • Physics tutor
4652 Views

In an electric propulsion system, alpha particles are accelerated through a potential difference of 100kV at an average rate of 10^20 alpha particles per second. Calculate the average thrust the system can provide.
Take the mass of alpha particle to be 6.6410^-27 kg accurate to 3 s.f. Note that the the work done in an electric field accross a potential difference is E = QV, where Q is the total charge of the alp...
Answered by Alexandru A. • Physics tutor
2253 Views

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Top answers

Using the principle of the conservation of energy, calculate the maximum speed of a ball of 5.0kg that has been dropped from a height of 20m. (Given that the gravitational field strength is equal to 9.8N/kg)

Given that a light ray enters a glass prism at angle of 50 degrees from the normal and is refracted to an angle of 30 degrees from the normal, calculate the speed of light in glass.

describe how a microwave oven works (EM waves + thermal physics)

A car of mass m is travelling at a speed v around a circular track of radius r banked at an angle θ. (a) What is the centripetal acceleration of the car? (b) What is the normal force acting on the car? (c) If θ = 45°, r = 1 km what is the maximum speed?

In an electric propulsion system, alpha particles are accelerated through a potential difference of 100kV at an average rate of 10^20 alpha particles per second. Calculate the average thrust the system can provide.

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