Mechanics | Relativity Answers

A hose directs a horizontal jet of water, moving with a velocity of 20m/s on to a vertical wall. The cross sectional area of the jet is 5 * 10^-4. If the density of water is 1000kg/m^3, calculate the force on a wall assuming the water is brought to rest there.

A falling body has an initial velocity of 200cm/sec.How far will it drop before its velocity becomes 10,000cm/sec

In the figure here, a red car and a green car move toward each other in adjacent lanes and parallel to an x axis. At time t = 0, the red car is at x_r = 0 and the green car is at x_g = 213 m. If the red car has a constant velocity of 22.0 km/h, the cars pass each other at x = 43.6 m. On the other hand, if the red car has a constant velocity of 44.0 km/h, they pass each other at x = 76.7 m. What are (a) the initial velocity and (b) the (constant) acceleration of the green car? Include the signs.

1. A comet with a mass of 75,000 kg is moving with a velocity of 25,000 m/s. Calculate its kinetic energy.

2. An airplane flying parallel to the ground undergoes two consecutive displacements. The first is 75 km 30.0° west of north, and the second is 155 km

A car of mass 9500kg is moving up a cliff from rest with a velocity of v= (3t²+2t)i +5tj m/s for 1 minute, if the slope of the cliff is 1, what distance was covered by the car in 1 minute.

A uniform ladder 13ft. long and weighing 40 lbs leans against a smooth vertical wall at a point 12ft. a rough floor. Calculate the reacting forces at the floor and the wall. solve by the component and the polygon method

A falling body has an initial velocity of 200cm/seconds.How far will it drop before its velocity becomes 10000 cm/seconds.

A weight of 20 lbs is on an inclined plane making 30 degrees above the horizontal. What component of the weight causes the body to slide along the plane? What is the normal reaction of the plane?

A 200 g ball is shot up a vertical

column of viscous liquid with an

initial velocity of 10 m/s Assuming

the force impeding the ball's motion

because of the viscosity of the liquid

is constant at 4.5 N, calculate how

high the ball goes before coming to

rest.