Mechanics | Relativity Answers

Explain what is fluid.

Consider Bob on Earth. At time t = 0, Alice flies by in her spaceship at constant velocity, heading to the right. (This is the same situation as the first question.) Which diagram represents Bob’s world line in Alice’s frame of reference?

A racing car moving along a circular track of radius 'r' at constant speed 'v' has described the angle 'a' at the centre of track. What is the average velocity?

This question is typical on some driver’s license exams: A car moving at 43 km/h skids
16 m with locked brakes.
How far will the car skid with locked brakes
at 86 km/h? Assume that energy loss is due
only to sliding friction.
Answer in units of m

What is newton third law.

What is surface tension dimension.

The water in a river is running due west with a speed of 10m/s. A boy in a boat tries to cross the river by rowing due south at 5m/s. The velocity of the boat relative to the shore is?
A. 5/3m/s, SW
B. 5.83m/s, SW
C. 12.5m/s, SW
D. 11.18m/s, SW

A force of 300 N acts on a 2.5 m long and 10 kg rod initially at rest. what is the final angular momentum of the rod if the force acts on it for 8 seconds?

I have given my son's these kinds of things to ponder since they were little and still like to think of things for them to think about. I thought of this question that we can not agree to an answer on. Here is my question thanks. You have two six foot diameter hollow balls made out of special unheard of metal that does not bend or break. You are able to be beamed into these hollow balls so there is no door. Each has an oxygen supply as well as a seat with seat belts. Both balls are suspended 40 feet above a farmers field. (soil depth before bedrock is 500 feet). Ball A has a total mass of 1000 pounds. Ball B has a total mass of 10,000 Tons. The question is will you have a higher chance of being injured in ball A or ball B or will the odds be the same? Will the extreme mass of ball B act as if the ground was a sponge as it's weight sinks it 20 feet into the ground and cushions the fall? I think a cushion is particularly significant depending on the mass that is being cushioned.