Mechanics | Relativity Answers

Starting from rest, how long does it take a moving man to reach a velocity of 5 m/sec if his acceleration is 1.75 m/sec^2?

Two masses of 2.25 kg each, connected by a string slide down a ramp making an agnle of 32 degrees with the horizontal/ the coeffcient of kinetic fricyion between m1 and the ramp is 0.46. The coefficient of kinetic friction between m2 and the ramp is 0.19. Find the magnitude of the acceleration of the masses. What is the tension in the string?

A 0.49kg rock is projected from the edge of the top of a building with an initial velocity of 8.36 m/s at an angle 60◦ above the horizontal.Due to gravity, the rock strikes the ground at a horizontal distance of 10.7 m from the base of the building.How tall is the building?

The acceleration of gravity is
9.8 m/s2 .

For the intercontinental ballistic missile to have a range of 6000 km, what must be the speed v0 of the missile at the end of the accelaration phase?

A person walks 24 m East and then walks
40 m at an angle 28◦ North of East. What is the magnitude of the total displacement? Answer in units of m.

For the intercontinental ballistic missile to have a range of 10500 km, what must be the speed v0 of the missile at the end of the accelaration phase? Take the distance of the accelaration phase, called the boost time, as
negligible compared to the travel time.

A stone is projected from ground level at 86 m/s. Its speed when it reaches its highest
point is 46 m/s. Find the angle of its projection.

Luis punts a football straight up into the air. it is in the air a total of 5 seconds. How many seconds did it spend going up? coming down? and how fast did it leave his foot? How fast was it moving right before hitting the ground, and how high did it go?

A rock is kicked 12.5m to the right of its starting point. What is its displacement?

The rubber worn from tires mostly enters the atmosphere as particulate pollution. Estimate how much rubber (in Kg) is put into the air in the United States every year. To get started, a good estimate for a tire treads depth is 1cm when new, and the density of rubber is about 1200kg/m3.