Physics Answers

The London Eye (the Ferris wheel in London) of diameter 120 m rotates from
rest with an angular acceleration of
and maintains at
uniform speed when it reaches 4.45 m/s, as depicted in Figure 2.1.
Figure 2.1
(i)
Find the angular speed of the London Eye when it reaches the uniform
speed.
(2 marks)
(ii)
Calculate the angular displacement that the London Eye covers in
7.50 minutes ride starting from rest.
(5 marks)
(iii)
Determine the apparent force experienced by a 75.5 kg passenger in
the capsule at the highest point of the ride given that the London Eye is
rotating at uniform speed.
(4 marks)

The image box is moving to the right. The box is pulled by a force in the direction of movement of 24 N. The box has a mass of 5.0 kg and a frictional force of 18 N.

a) Draw a force pattern for the box and name the forces acting on the box. Air resistance does not need to be considered.

b) Write the scalar equation of motion of the box in the horizontal direction and calculate the acceleration of the box.

Pictures link: https://app.tabletkoulu.fi/files/Section/21245/files/laatikko%20liik%20oikelaale.png

Students study the sliding of a wooden block on an inclined plane using ultrasonic radar. The inclination of the plane was adjusted so that the block slid at a constant speed. The slope angle was then 21º. The mass of the block was 275 g. Calculate the amount of friction as the block slid smoothly.

A battery having an e.m.f. of 110 V and an internal resistance of 0.2 Ω is connected in parallel with another battery having an e.m.f. of 100 V and internal resistance 0.25 Ω. The two batteries in parallelare placed in series with a regulating resistance of 5 Ω and connected across 200 V mains, as shown. Calculate :(i) The magnitude and direction of the current in each battery.(ii) The total current taken from the supply mains

How fast must a 1000kg Honda Civic travel to have the momentum of 1 x 10^6kg m/s?

a. Draw a diagram to show the path of a ray of light travelling from air into a
rectangular glass block at an angle of about 45°.
b .Show the path of the ray as it emerges from the block.
c. Explain why the ray changes direction each time it crosses the air/glass
boundary.
d .Draw a second diagram showing a ray that travels through the block
without its direction changing.

Draw a ray diagram to show how a ray of light can be turned through 100°
using two plane mirrors. Mark on your diagram a value for the angle of
incidence at each of the mirrors.