Physics Answers

A body starts rest and moves with a uniform accelaration of 2m/s2 in straight line

a. what is its velocity after 5s?

b.how far has it travelled in this time?

c.when will it be 100m from the starting point?

A body starts from rest and reaches a velocity of 5m/s after travelling with uniform acceleration for 2s. calculate the accelaration

Three charges lie along the x - axis. A positive charge q1 = 10 𝝁C is at x = 1.00 m, and a negative charge q2 = – 2.0 𝝁C is at the origin. Where must a positive charge q3 be placed on the x - axis so that the resultant force on it is zero?

The orbital time of Neptune around the Sun is 165 Earth years and its orbital path is 30 times longer than that of the Earth.

Calculate the orbital speed of Neptune relative to the Earth. orbital speed

State how the speed of travel of Neptune compares with that of the Earth.

Redshift measurements show that a galaxy is moving away from the Earth at the speed of 60000 km/s. Taking the Hubble constant H, as 2.2 x 10-18s¹ and 1 light-year as 10¹3 km, calculate and show your working for:

a)how far the galaxy is from the Earth distance

b)how long it has taken light from the galaxy to reach the Earth

c) the time the galaxy and the Milky Way have been travelling apart

d) Explain the significance of the time you calculated in c part of the question

1. A coil with 25 turns of wire is wrapped around a hollow tube with an area of 1.8 m². Each turn has the same area as the tube. A uniform magnetic field is applied at a right angle to the plane of the coil. If the field increases uniformly from 0.00 T to 0.55 T in 0.85 s, find the magnitude of the induced emf in the coil. If the resistance in the coil is 2.5 , find the magnitude of the induced current in the coil.

2. A coil consists of 200 turns of wire having a total resistance of 2.0. Each turn is a square of side 18 cm, and a uniform magnetic field directed perpendicular to the plane of the coil is turned on. If the field changes linearly from 0 to 0.50 Tin 0.80 s, what is the magnitude of the induced emf in the coil while the field is changing? What is the magnitude of the induced current in the coil while the field is changing?

Redshift measurements show that a galaxy is moving away from the Earth at the speed of 60000 km/s. Taking the Hubble constant H, as 2.2 x 10-18s¹ and 1 light-year as 10¹3 km, calculate and show your working for:

a) a how far the galaxy is from the Earth distance

b) how long it has taken light from the galaxy to reach the Earth

c) the time the galaxy and the Milky Way have been travelling apart

D) Explain the significance of the time you calculated in c part of the question

The orbital time of Neptune around the Sun is 165 Earth years and its orbital path is 30 times longer than that of the Earth.

a Calculate the orbital speed of Neptune relative to the Earth. orbital speed b

State how the speed of travel of Neptune compares with that of the Earth.

Three charged particles are placed at the corners of an equilateral triangle of side 1.2

m. The charges are +4 μC, -8 μC, and -6 μC. Calculate the magnitude and direction of

the net force on each due to the other two.

1.0 mol of an ideal gas starts at 1.0 atm and 77F and does 1.0 kJ of work during an adiabatic expansion. Calculate the final volume of the gas. Express your answer in litres. In your calculation, fully show the conversion of units. Marks will be given for the necessary conversion factors and every number must have a unit in this problem!