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A ball mass 2kg rests on a slope of angle 60 degrees. If it is stationary, calculate the coefficient of static friction

Because the ball is stationary, the sum of the forces acting on it must be equal to 0. We can split the ball's weight into two components: perpendicular and parallel to the slope.W(para)=2gsin60W(perp)=2gcos...
ME
Answered by Milo E. • Physics tutor
1905 Views

For a body of mass m orbiting a body of mass M with radius of orbit r, what is the minimum velocity that m needs in order to escape M's gravitational pull and end up infinitely far away from M?

Answer: escape velocity v = sqrt[(2GM)/r], where G is the gravitational constant. Reasoning: Conservation of energy means that the total initial energy must be equal to the total final energy, in other words...
GF
Answered by Grace F. • Physics tutor
1643 Views

Explain the Lorenz force

The force exerted on a charged particle q moving with a velocity v through an electric and magnetic field, E and B respectively. F=qE+qvxB. We usually care mostly about the magnetic part. It is also worth no...
AM
Answered by A M S. • Physics tutor
2174 Views

A pipe has one open and one closed end. Determine the ratio of the frequency of the first harmomic to that of the next harmonic.

The first harmonic has wavelength λ 1 = 4L and the next harmonic has wavelength λ 2 = 4L/3 . Hence :f 1 /f 2 = (4L/3)/4L = 1/3
PM
Answered by Pablo M. • Physics tutor
3002 Views

Use the idea of a thermos flask to explain conduction, convection and radiation. Comment also how a thermos flask can reduce heat loss.

Conduction is the transfer of heat caused by the collision of particles inside a substance and between substances. In order to reduce heat loss, some thermos flasks have a vacuum between the container of the...
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Answered by Felipe R. • Physics tutor
13492 Views