Other Physics Answers

A bicycle wheel of diameter 80 cm accelerates uniformly from rest to an angular speed of

50 rad/s in 20s.

(a) Find the angular acceleration of the wheel.

2

(b) If a small stone is stack between the grooves of wheel, find the tangential and radial

acceleration of a stone.

(c) During this time, how many revolutions has the wheel turned?

(d) If the wheel turns through 20 revolutions in coming to rest, at what rate was the angular

velocity changing?

A belt runs on the wheel of a hammer mill of radius 20cm. During the time the wheel takes

to coast uniformly to rest from an initial speed of 5rev/s, 30m of belt length over the wheel.

Find for this wheel the,

(a) number revolution it turns while stopping.

(b) deceleration of the wheel.

(c) time it took to come to a stop

A motor turning at 1800rev/min rotates uniformly to a stop in 20s.

(a) Find its angular deceleration in rev/s2 and rad/s2.

(b) The motor has a wheel of radius 10cm attached to its shaft. What length does the wheel

wind in the 20s?

A wheel turning at 50rev/min has its speed increased to 65rev/min. If the increase occurred

in 20s, find the

(a) rate at which the angular speed changes.

(b) angular displacement during this time in

(i)

(ii)

(iii) radians

revolutions

degrees

A wheel turning at 50rev/min has its speed increased to 65rev/min. If the increase occurred

in 20s, find the

(a) rate at which the angular speed changes.

(b) angular displacement during this time in

(i)

(ii)

(iii) radians

revolutions

degrees

Express the following angles in degrees, revolution and radians

(a) 45o

(b) 65 rad

(c) 120 rev

A car is traveling at 50 ms-¹from rest cover s distance of 10km in 40, minutes, Calculate the acceleration.

A sound wave in air consists of alternate compressions and rarefactions along its path so in this situation how does a compression differs from a rarefaction

What happpens to amplitude and wavelength if the loudness of the sound is increased at constant pitch and when the pitch of the sound is increased at constant loudness

The Hall Voltage across a conductor in a 55mT magnetic field is 1.9μV . When used with the same current in a different magnetic field, the voltage across the conductor is 2.8μV .

What is the strength of the second field?