Mechanics | Relativity Answers

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

Calculate the solar angle for the day at 10am and 2pm individually for the location of

21.23 south latitude on the 18th march 1993 (Assume it is non leap year)

A bicyclist encounters a series of hills.uphill speed is always V1 downward speed is always V2. The total distance he travelled is X.with uphill and down hill portions of equal length.what was the cyclist average speed?

A boy travelled 240km with constant speed except for 30min cokkee break after he has been on the road for 1.5hr .the trip including the break takes him 2hr and 30min.what was his average spped?

A man pulls a box with a force of 70N along the positive y axis, while a boy pulls it with a force of 50N, making an angle of 80° counter clockwise with the positive y axis. In what direction will the second boy apply a force of 60N so that the box will move in the positive y axis