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A ball is dropped from a 5.0m high window. Assuming air resistance is negligible, calculate the time taken for it to hit the ground.

It is helpful to break down questions and draw a diagram. Here we know we have a ball that is being dropped, so it will initially be stationary. Gravity will cause it to accelerate towards the ground at 9...

Answered by Christopher P. • Physics tutor

6886 Views

Define a "Vector Quantity" and list 2 examples.

a) A vector quantity is a quantity with both magnitude and direction. (opposite would be a "scalar quantity")

b) examples could include acceleration, weight, displacement, velocity etc.<...

Answered by Thomas F. • Physics tutor

1852 Views

If the force between two point charges of charge 'Q1' and 'Q2' which are a distance 'r' apart is 'F' then what would the force be if the charge of 'Q1' is tripled and the distance between them doubled?

We know from Coulombs law that the force between two point charges is directly proportional to the product of the magnitudes of each charge and inversley proportional to the square of the distance between...

Answered by Joseph H. • Physics tutor

6699 Views

A gun of mass 10kg fires a bullet of mass 240g at a speed of 300ms-1. What is the speed of the gun's recoil?

First, convert the mass of the bullet into SI units -> 240g=0.24kg

The law of the conservation of momentum states that m₁v₁=m₂v₂. To find the speed of...

Answered by Jonny F. • Physics tutor

1961 Views

Derive an expression for the centripetal acceleration of a body in uniform circular motion.

(I assume familiarity with positions represented by vectors and differentiation of trigonometric functions). Consider the coordinates of a point moving in a circle of radius r around the origin. The equat...

Answered by Hubert A. • Physics tutor

3322 Views