Mechanics | Relativity Answers

A machine operates with a power of 1500 Watts. the machine lifts one steel beam, of 500 N, vertically upward 15 meters. How long does it take for the machine to lift 20 beams

A 3kg box is pushed with a force of 15 N across a friction less floor for 3 second.
What is the power exerted on the box?

How can a satellite's speed decrease without its angular momentum changing?

Nerve impulses travel at different speeds. Touch receptors travel at 76.2 m/s, pain receptors travel at 0.610 m/s. I'm 6' 5" tall (1" = 2.540cm) and if I stub my toe. what is the time delay between hittimg my toe and feeling it? What is the time delay between feeling it and feeling the pain?

You and a friend are going to a river, where they have a rope swing. Your friend, who has a mass of 60 kg, hops on the end of the rope. You tug horizontally on your friend with a force of 300 N, pulling them back until you can't move them any more. Then you let go and watch them swing out over the river. When the rope swing is at it's farthest point your friend lets go, eventually splashing into the river. If the rope is 30 m long, what total distance in m did your friend travel from her starting point to where she let go?

A 50g ball travelling at 25.0m/s is bounced off a brick wall and rebounds at 22.0m/s. A high-speed camera records this event. If the ball is in contact with the wall for 3.50ms, what is the magnitude of the average acceleration of the ball during this time interval?

The high speed 300 series Shinkansen trains of Japan consist of 16 aluminum cars with a combined mass of 7.10 x 10 to the power of 5kg the reduction in mass from the 100 series trains enables the 300 series to reach a top speed of 270 km/h. What is the magnitude of a 300 series trains momentum at it top speed?

Fx=0=T2X-T1X=T2cos(10degrees)-T1sin(10degrees)

what is the final speed of a cargo container if it has an initial velocity of 2 m/s it moves 20 meters provided it has a weight of 14700?

A car accelerates 3.0 m/s from rest. After 4.0 s, (a) what is its velocity? (b) what distance is covered