Physics Answers

A distance of 0.002 meter separates two objects of equal mass. If the gravitational force between them is 0.0104N, find the mass of each object.

The moon has a mass of 7.34 x 10²² kg and a radius of 1.74 x 10⁶ meters. If you have a mass of 66kg, how strong is the force between you and the moon?

A train started from rest and moved with constant acceleration. At one time it was travelling at 33 m/s and 160m farther on it was travelling 54m /s

Calculate (a) acceleration (b) time required to travel 160m(c)distance moved from rest to time the train had a speed of 33m/s

What tests would be undertaken to tell what elements are being fused by a star?

E.g. how could anyone tell whether a star is fusing helium or magnesium.

Is it based on the colour of light emitted? If so what would these be for fusion from hydrogen to iron?

shows an arrangement of four charged particles, with angle θ = 30.0° and 

distance d = 2.00 cm. Particle 2 has charge q2 = +8.00 × 10-19 C; particles 3 and 4 have charges q3

= q4 = -1.60 × 10-19 C. (a) What is distance D between the origin and particle 2 if the net 

electrostatic force on particle 1 due to the other particles is zero? (b) If particles 3 and 4 were 

moved closer to the x axis but maintained their symmetry about that axis, would the required 

value of D be greater than, less than, or the same as in part (a)?

The time period of simple pendulum is 2s.what Will be it's length on earth

The siren on an emergency vehicle has a frequency of

840 Hz. The emergency vehicle passes you at a speed of

28 m/s .The frequency of the receding siren detected by you is?

A convex lens of focal length 6cm is at distance of 10cm from a screen placed at right angles to axis of lens.A diversing lens of 12cm focal length is palced co-axial between convex lens and screen so that image of object at 24cm from convex lens is formed on secm.The distance between them?

Determine the gradient of a function φ = x^4 +y^2 +z^3 at the point (1,-2,-1)

Using the equation for acceleration due to gravity (g), compute the

approximate value of acceleration due to gravity with the given values: mass of Earth = 6.0 x 10^24

kg and radius of Earth = 6.37 x 10^6 m. Show your Solution. Compare the value you had with the

acceleration due to gravity we use which is 9.8 m/s^2

Guide Questions: 

1. What factors control the gravitational forces that the objects exert on each other? 

2. How can the Sun’s gravitational pull account for the orbital motion of planets?