Mechanics | Relativity Answers

An object is tracked by a radar station and found to have a position vector by r=(3500-160t)i + 2700j + 300k, with r in m and t in sec. The radar station's x-axis points east, its y-axis north and its z-axis vertically up. If the object is a 250-kg missile warhead, what are (a) its linear momentum (b) its direction of motion (c) its net force on it.

please help,
when a golfer hits a ball is in contact with the ball for about 0.0005 seconds and the ball leaves the club with a speed of 70ms^-1. The mass of the ball is 46g. Determine the mean accelerating force.

the particle is projected with v=6i+3xj. find eqn of path followed
a.y=x2(2-square)
b.y=2x2
c.y=1/2x2

why centrifugal force is called pseudo force ?

A force of
2i⃗ +7j⃗
N acts on a body of mass 5kg for 10 seconds. The body was initially moving with constant velocity of i⃗ −2j⃗ m/s
. Find the final velocity of the body in m/s, in vector form.

Which of these is NOT a statement of Newton’s law of universal gravitation?

How large an average force is required to stop a 1400-kg car in 5.0 s if the car’s initial speed is 25 m/s?

A bird flies in the east direction with a speed of 5 ms−1. The wind is blowing towards north at a
speed of 3 ms−1. Determine the relative velocity of the bird with respect to the wind. Draw
appropriate diagram for solving the proble

A piece of plastic barely floats in water. If it has a mass of 20g, what is its volume?

If any weight m is attached to an arm at x distance. This arm is pivoted ( can rotate free in vertical plan ) in vertical plan. If I want to lift this m weight in circular path up to highest point ( Means 0 degree to 180 degree in vertical plan). How much work is done. Please provide me formula for it.