Mechanics | Relativity Answers

A stone is thrown from the top of a building upwards at an angle of 30.0 to the horizontal with an initial speed of 20.0m/s. The height of the building is 45m.
1. How long does it take to reach the ground?.
2. What is the speed of the stone just before it strikes the ground?

An Eskimo returning from a successful friction trip pulls a sled loaded with salmon. The total mass of the sled and salmon is 50.0kg and the Eskimo exert a force of 120N on the sled by pulling on the rope.
a) How much work does he do on the sled if the rope is horizontal to the ground and he pulls the sled 5.00m ?
b)How much work does he do on the sled if tita equal 30.0° and he pulls the sled same distance

A package with mass M is unloaded from a Truck with an inclined ramp. The ramp has rollers that eliminates friction and the truck unnotes the package from an initial height H. The ramp is inclined at an angle B. Find the algebraic expression in terms of this quantities for the work done on the package during its trip down the ramp.

Suppose you first walk 11.5 m in a direction 20° west of north and then 24.5 m in a direction 40° south of west as shown in the figure. What is the component of your displacement in the x-direction, in meters?

a baseball is thrown upwards and leaves the hand at a height of 1.6 above the level playing field. the ball has an initial speed of 26 m/sec at an angle of 24 above the horizontal. determine the maximum height reached and the range

Three forces act together on an object: Force A of 4.0 lb due South, Force B of 14lb due East, and Force C to be determined. The result of these three forces is a net force R of 9.0 lb in a direction 27 degrees north of east. What is the magnitude and direction of Force C?

The Earth exerts a gravitational pull of 2*10^20 N on the Moon;the sun exerts a gravitational pull of 4.3*10^20 N on the Moon.What is the net force on Moon ; when the angular separation between the Earth and the Sun is 90 as seen from the Moon?

An archer pulls the string of her bow back with her hand with a force of 180 N. If the two halves of the string above and below her hand make an angle of 120 with each other ,what is tension in each half of the string
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why do we need to find cos(theta) why can we not just find (d) and plug that into the gravational force equation

The earth exerts a gravitational pull of 2*10^20 N on the moon; the sun exerts a gravitational pull of 4.3*10^20 N on the moon. What is the net force on the moon when the angular separation between the earth and the sun is 90 as seen from the moon?