Question

A

The Earth exerts a gravitational pull of 2.0 ×1020 N on the Moon; the Sun exerts a
gravitational pull of 4.3 ×1020 N on the Moon.What is the net force on the Moon when the angular
separation between the Earth and the Sun is 90 as seen from the Moon?
B
: A gun on the shore (at sea level) fires a shot at a ship which is heading directly toward
the gun at a speed of 40 km/h. At the instant of firing, the distance to the ship is 15000 m. The muzzle
speed of the shot is 700 m/s. Pretend that there is no air resistance. (a) What is the required elevation
angle for the gun? Assume g = 9.8 m/s2. (b) What is the time interval between firing and impact?

C
Discuss uniform circular motion to calculate centripetal acceleration, time period,
scalar components of velocity vector, acceleration vectors and the angle between x and y components
of acceleration. Draw respective diagrams showing displacement vectors, velocity vectors and
acceleration vectors.

answer all the arts with proper steps

Answer 1

Here we apply concept of gravitational force and vector addition as well as kinematics and circular motion concept.