Mechanics | Relativity Answers

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

A helicopter pilot throws a ball downwards from an unknown height above the ground. The ball has an initial speed of 14.1 m/s. The ball hits the ground 9.2 s later. Find the initial height of the ball above the ground

A trolley,mass 5kg moves at 4m.s east across a frictionless horizontal surface. A brick of mass 1.5kg is dropped onto the trolley . Calculate the change in momentum of the 5kg trolley

The bone breaks if stress greater than 1.50 x 10 8 N/m 2 is imposed on it. (a) What is the

maximum force that can be exerted on the male humerus in the upper arms if it has a

minimum effective diameter of 5.87 cm? (b) If this much force is applied, by how much

does the 27.0-cm-long humerus stretched? Assume Young’s modulus for bone is 1.50 x

10 10 Pa.

A 75 kg. block of wood rest on the top of the smooth plane surface, whose length is 4 meters and whose altitude is 1.0 meter. How long will it take for th block to slide down to the bottom of the plane when released?

A ball is thrown from a tower 42 m. high above the ground with a velocity of 270 m/sec directed at 28⁰ from the horizontal. How long will the ball hit the ground?