Mechanics | Relativity Answers

The control panel on a spaceship contains a light that blinks every 2.00 s as observed by an astronaut in the ship. If the spaceship is moving past Earth with a speed of 0.750 c, determine the time interval between blinks as observed by a person on Earth.

c = 3times10^8

Roger is travelling with a speed of 0.800c relative to Mia. Roger travels for 50.0 s as measured on his watch.

 Calculate the elapsed time on Mia’s watch during this motion.

c = 3.0 ×

10⁸

What distance separates two objects of equal mass (5 kg) that are experiencing a gravitational force of 100 N?

What is the force of gravity between two sacks of rice and corn with a masses of 50.0 kg and 68.0 kg separately by 15.0 m?

7. A child uses a sled to slide down a very slippery, snowy slope. The sled has a mass of 80 kg and the child has a mass of 35 kg. The top of the slope is 4.0 m higher than the bottom and the sled is travelling at 4.0 m s−1 at the top. Assuming no work is done on the sled by the surface of the slope or the child, what is the speed of the sled (and child) at the bottom of the slope (in m s

A man which travels due north in order to cross a river 5km wide flowing due east at 3km per hour if he can roll at 10km per hour in still water

Find by calculation

The direction in which he must head his boat in order to get to his destination directly opposite his starting point

A car runs at a constant speed of 15m/s for 300 second and then accelerate uniformly to a speed of 25m/s over a period of 20 second.this speed is maintained for 300 seconds before the car is brought to rest with uniform deceleration in 30 second

Draw the graph

A 6 ft 160 pound man was exposed to mercury. A vial of blood was taken for testing. The result was 0.005milligrams of mercury was found in the test sample. How much mercury was found in the while body.

A body of mass 25 kg moving at 3 m per second on a rough horizontal floor is brought to rest after sliding through a distance of 2.5 m on the floor. Calculate the coefficient of sliding friction (g=10.0ms-2)

momentum is conserved in a collision of two objects as measured by an observer on a uniformly moving train. show that momentum is also conserved for a ground observed