12-91. The fireman holds the hose at an angle 0 = 30° with horizontal, and the water is discharged from the hose at A with a speed of va = 40ft/s. If the water stream strikes the building at B, determine his two possible distances s from the building.

Q: 15-135. A power lawn mower hovers very close over the ground. This is done by drawing air in at a…

A: Given, Va = 6 m/s AA = 0.25 m2 AB = 0.35 m 2 m = 15 kg ρa = 1.22 kg/m 3 Rate of air flow to the lawn…

Q: = 14-86. Just for fun, two 150-lb engineering students A and B intend to jump off the bridge from…

A: a) Unstretched lengthLet L be the unstretched length of the cord, and x be the stretched length…

Q: projectile is fired with a speed of 1,000 ft/s at a height of 500 ft. Determine the elevation angle…

A:

Q: A pump is located near the edge of the horizontal platform shown. The nozzle at A discharges water…

A:

Q: If the ball has a mass of 40 kg and a speed of 5 m/s at the instant it is at the lowest point (θ…

A:

Q: Show that the girl at A can throw the ball to the boy at B by launching it at equal angles measured…

A:

Q: R12-3. A projectile, initially at the origin, moves along a straight-line path through a fluid…

A: Rate of change of displacement of object is known as velocity. Velocity is vector quantity.

Q: The thrust on the 4-Mg rocket sled is shown in the graph. Determine the sleds maximum velocity and…

A:

Q: If the 40 kg skier passes point A with a speed of 2 m/s, determine his speed when he reaches point…

A: Given Data

Q: 5. The 5-lb cylinder is falling from A with a speed of va = 10 ft/s onto the platform. Determine the…

A: GIVEN DATA- MASS OF CYLINDER m=5lb K=400lb/ft V=10ft/s

Q: Marbles having a mass of 5 g are dropped from rest at A through the smooth glass tube and acCumulate…

A:

Q: 15-111. A box having a weight of 8 lb is moving around in a circle of radius r4 = 2 ft with a speed…

A: To find: The speed of box at B and work done after pulling the rope from A to B. Given: The weight…

Q: *15–124. The boat has a mass of 180 kg and is traveling forward on a river with a constant velocity…

A: Given that, Mass of the boat, m=180 kg,Velocity of boat, vb=70 kmhVelcoity of river, vr=5 kmhMass…

Q: The forked rod is used to move the smooth 2-lb particle around the horizontal path in the shape of a…

A: r=2+2cosθ The angular velocity is θ˙=0.8 rad/s. θ=30° The mass of the particle is m=2 lb32.1741…

Q: The ball is thrown off the top of the 55-ft tall building. If the initial velocity V, is 57 ft/s and…

A:

Q: A sandblaster at A directs the flow of sand from his hose to the fire at B. If 6 = 0, what is the…

A:

Q: The 2,000 kg car is being towed by a motor as shown in the figure below. If the motor exerts a force…

A:

Q: Marbles having a mass of 5 g are dropped from rest at A through the smooth glass tube and accumulate…

A:

Q: The 2 lb ball at A is suspended by an inextensible cord and given   an initial horizontal velocity…

A: Let position 1 be at ALet position 2 be the point described by the angle  where the path of the ball…

Q: The water sprinkler, positioned at the base of the hill, releases a stream of water with a velocity…

A: Given: Here are the given data, The velocity of water, v=25fts The angle of inclination, θ=50° The…

Conservation of Energy

In physics, the rule of the conservation of energy states that energy doesn’t disappear from the atmosphere; instead, it changes its form from one type to another. Energy is one of the most important physical quantities in nature, and it cannot be created or destroyed — only transformed.