# A 11.7 kg weather rocket generates a thrust of 240 N.

Get college assignment help at uniessay writers A 11.7 kg weather rocket generates a thrust of 240 N. The rocket, pointing upward, is clamped to the top of a vertical spring. The bottom of the spring, whose spring constant is 470 N/m, is anchored to the ground.

## at the local county fair, you watch as a blacksmith drops

at the local county fair, you watch as a blacksmith drops a .50 kg iron horseshoe into a bucket containing 25 kg of water. If the initial temperature of the water is 23 C what is the equilibrium temperature of the system?

## A superhero flies 274 m from the top of a tall

A superhero flies 274 m from the top of a tall building at an angle of 22 ◦ below the horizontal. What is the horizontal component of the superhero’s displacement?

## A 70 kg meteorite buries itself 5.5m into soft mud. The

A 70 kg meteorite buries itself 5.5m into soft mud. The force between the meteorite and the mud is given by F(x) = (680 N/m^3)x^3, where x is the depth in the mud. What was the speed of the meteorite when it initially impacted the mud?

## A sledge loaded with bricks has a total mass of 19.0

A sledge loaded with bricks has a total mass of 19.0 kg and is pulled at constant speed by a rope. The rope is inclined at 20.3° above the horizontal, and the sledge moves a distance of 20.3 m on a horizontal surface. The coefficient of kinetic friction between the sledge and surface is 0.500.

## What will be the equilibrium temperature when a 253 g block

What will be the equilibrium temperature when a 253 g block of copper at 281^circ C is placed in a 137 g aluminum calorimeter cup containing 817 g of water at 14.5^circ C?

## What is the acceleration of a 747 jumbo jet, mass 31,000

What is the acceleration of a 747 jumbo jet, mass 31,000 kg, in takeoff when the thrust for each of its four engines is 28,000 N?

## Only two forces act on an object (mass = 4.60 kg),

Only two forces act on an object (mass = 4.60 kg), as in the drawing. (F = 68.0 N.) Find the magnitude and direction (relative to the x axis) of the acceleration of the object.

## A magnifying glass has a focal length of 10 cm. Estimate

A magnifying glass has a focal length of 10 cm. Estimate how far from a piece of paper you must hold the lens to produce a sharp image of a streetlight 40 ft. overhead

## If the ball is released from rest at a height of

If the ball is released from rest at a height of 0.67 above the bottom of the track on the no-slip side, what is its angular speed when it is on the frictionless side of the track? Assume the ball is a solid sphere of radius 2.2 and mass 0.14 .

## A loudspeaker of mass 25.0 is suspended a distance of =

Get college assignment help at uniessay writers A loudspeaker of mass 25.0 is suspended a distance of = 1.20 below the ceiling by two cables that make equal angles with the ceiling. Each cable has a length of = 2.70 . What is the tension in each of the cables? Use 9.80 for the magnitude of the acceleration due to gravity.

## A projectile is launched vertically upward from a planet of mass

A projectile is launched vertically upward from a planet of mass M; and radius R ; its initial speed is twice the escape speed. Derive an expression for its speed as a function of the distance from the center of the planet.

## A skier of mass 70 kg is pulled up a slope

A skier of mass 70 kg is pulled up a slope by a motor-driven cable. (a) How much work is required to pull him 60 m up a 30 degree slope (assumed frictionless) at a constant speed of 2.0 m/s? (b) What power must a motor have to perform this task?

## A 3 kg mass is released from rest and falls a

A 3 kg mass is released from rest and falls a distance before hitting a spring on the ground. The spring is compressed a distance 18 cm as the mass stops. Calculate the total distance that the mass has fallen. The spring constant is 394 N/m.

## two planes approach each other head on.each has a speed of785

two planes approach each other head on.each has a speed of785 km/h and they spot each other when they are initially 11.0 km apart. how much time do the pilots have to take evasive action?

## Problem 15-67 The ball of mass mb is thrown at the

Problem 15-67 The ball of mass mb is thrown at the suspended block of mass mB with velocity vb. If the coefficient of restitution between the ball and the block is e, determine the maximum height h to which the block will swing before it momentarily stops.

## A 22 kg child slides down a 2.0 m-high playground slide.

A 22 kg child slides down a 2.0 m-high playground slide. She starts from rest, and her speed at the bottom is 2.8 m/s

## A playground merry-go-round has radius 3.00 {rm m} and moment of

A playground merry-go-round has radius 3.00 {rm m} and moment of inertia 3000 {rm{ kg}} cdot {rm{m}}^2 about a vertical axle through its center, and it turns with negligible friction.

## Two children, Ferdinand and Isabella, are playing with a water hose

Two children, Ferdinand and Isabella, are playing with a water hose on a sunny summer day. Isabella is holding the hose in her hand 1.0 meters above the ground and is trying to spray Ferdinand, who is standing 10.0 meters away. To increase the range of the water, Isabella places her thumb on the hose hole and partially covers it. Assuming that the flow remains steady, what fraction f of the cross-sectional area of the hose hole does she have to cover to be able to spray her friend? Assume that the cross section of the hose opening is circular with a radius of 1.5 centimeters.

## A 10.0-{rm kg} shell is traveling horizontally to the right at

A 10.0-{rm kg} shell is traveling horizontally to the right at 25.0 {rm m/s} relative to the ground when it explodes into two fragments, one of mass 3.00 {rm kg} and the other of mass 7.00 {rm kg}. The lighter fragment goes directly forward, and the explosion releases 1.50 × 103 {rm J} of mechanical energy to the fragments. Find the magnitude of the velocity of the heavier fragment relative to the ground just after the explosion.

## A rectangular block of ice 14 m on each side and

A rectangular block of ice 14 m on each side and 1.4 m thick floats in sea water. The density of the sea water is 1025 kg/m3. The density of ice is 917 kg/m3. How many penguins of mass 22 kg can stand on the ice before they get their feet wet?

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