Mechanics | Relativity Answers

You were 60 meters to the west of your home at 10AM, and then you walked to a shop 150 meters to the east of your home at 10:15AM. After that you walked 30 meters more in the west direction in 5 minutes. Find your final position, total displacement, average speed and average velocity.

A body moving through air at a high speed, V experiences a retarding force F given by F=KApV^x, where A is the surface area of the body, p is the density of the air and K is a numerical constant. Deduce the value of x

A 150 g baseball pitched at a speed of 40 m/s is hit straight back to the pitcher at a speed of 60
m/s. What is the magnitude of the average force on the ball if the bat is in contact with the ball
for 5.0 m/s?

A 150 g baseball pitched at a speed of 40 m/s is hit straight back to the pitcher at a speed of 60
m/s. What is the magnitude of the average force on the ball if the bat is in contact with the ball
for 5.0 m/s?

a person bicycling uses 1000 kj in an hour. how much work does he do?

34N[E] + 20N[W]

two particle A and B executing SHM along same straight line with same amplitude and same mean position A start its motion from mean position and move toward positive extreme while B starts from negative extreme position Angular frequency of A is Wa and that of B is Wb choose the incorrect statment
A)if Wa =2Wb then when they meet first their velocity will be zero
B)ifWa>2Wb then when they meet first time their velocity are in same direction
C)ifWa<2Wb then when they meet their velocity will be in same direction
D)their velocity when they meet does not depend on W

converts mechanical enegry found in an object into heat energy.

a telegraph pole is placed on a two wheeled folly located 4m from the thicker end and an upward force of 1500 N at the thinner end is required to keep it horizontal. the pole is 15m long and weighs 9000n, where is the centre of gravity

A child of mass 50 kg is standing on the edge of a merry go round of mass 250 kg and
radius 3.0 m which is rotating with an angular velocity of 3.0 rad s−1
. The child then
starts walking towards the centre of the merry go round. What will be the final angular
velocity of the merry go round when the child reaches the centre?