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Get college assignment help at uniessay writers A 69-kg skier is going down a slope oriented 33° above the horizontal. The area of each ski in contact with the snow is 0.13 m2. Determine the pressure that each ski exerts on the snow.

## As part of a safety investigation, two 1900 {rm kg} cars

As part of a safety investigation, two 1900 {rm kg} cars traveling at 24 {rm m/s} are crashed into different barriers. Find the average forces exerted on (a) the car that hits a line of water barrels and takes 1.5 {rm s} to stop, and (b) the car that hits a concrete barrier and takes 0.4 {rm s} to stop.

## When lifting an object using the biceps muscle, the forearem acts

When lifting an object using the biceps muscle, the forearem acts as a lever with the fulcrum at the elbow. the input work is provided by the biceps muscle pulling up on the bone. How much force must the biceps exert to lift an object weighing 12N?

## As part of a safety investigation, two 1400 {rm kg} cars

As part of a safety investigation, two 1400 {rm kg} cars traveling at 20 {rm m/s} are crashed into different barriers. Find the average forces exerted on (a) the car that hits a line of water barrels and takes 1.5 {rm s} to stop, and (b) the car that hits a concrete barrier and takes 0.1 {rm s} to stop.

## A stone with a mass of 0.700 {rm kg} is attached

A stone with a mass of 0.700 {rm kg} is attached to one end of a string 0.900 {rm m} long. The string will break if its tension exceeds 50.0 {rm N}. The stone is whirled in a horizontal circle on a frictionless tabletop; the other end of the string remains fixed. Find the maximum speed the stone can attain without breaking the string.

## Two equally charged, 1.00 {rm g} spheres are placed with 2.00

Two equally charged, 1.00 {rm g} spheres are placed with 2.00 {rm cm} between their centers. When released, each begins to accelerate at 225 {rm m/s^2}. What is the magnitude of the charge on each sphere?

## A 74 kg water skier floating in a lake is pulled

A 74 kg water skier floating in a lake is pulled from rest to a speed of 10 m/s in a distance of 25 m. What is the net force exerted on the skier, assuming his acceleration is constant?

## A stunt man whose mass is 70 kg swings from the

A stunt man whose mass is 70 kg swings from the end of a 4.4 m long rope along the arc of a vertical circle. Assuming that he starts from rest when the rope is horizontal, find the tensions in the rope that are required to make him follow his circular path at each of the following points. (a) at the beginning of his motion (b) at a height of 1.5 m above the bottom of the circular arc (c) at the bottom of the arc

## A shop sign weighing 215 N is supported by a uniform

A shop sign weighing 215 N is supported by a uniform 165-{rm N} beam as shown in the figure .

## In the figure below, the cube is 38.0 cm on each

In the figure below, the cube is 38.0 cm on each edge. Four straight segments of wire—ab, bc, cd, and da—form a closed loop that carries a current I = 4.65 A in the direction shown. A uniform magnetic field of magnitude B = 0.022 T is in the positive y direction. Determine the magnetic force on each segment.

## How many revolutions per minute must a circular, rotating space station

Get college assignment help at uniessay writers How many revolutions per minute must a circular, rotating space station of radius 1000 m rotate to produce an artificial gravity of 9.8m/s squared

## The arm in the figure below weighs 40.0 N. The force

The arm in the figure below weighs 40.0 N. The force of gravity acting on the arm acts through point A. Determine the magnitudes of the tension force t in the deltoid muscle and the force s of the shoulder on the humerus (upper-arm bone) to hold the arm in the position shown.

## a ball is launched with a velocity of 5.50 m/s, at

a ball is launched with a velocity of 5.50 m/s, at an angle of 50° to the horizontal. The launch point is at the base of a ramp of horizontal length d1 = 5.00 m and height d2 = 3.60 m. A plateau is located at the top of the ramp. What is the magnitude of its displacement from the launch point when it lands?

## In 2.0 minutes, a ski lift raises 4 skiers at constant

In 2.0 minutes, a ski lift raises 4 skiers at constant speed to a height of 170 m. The average mass of each skier is 65 kg. What is the average power provided by the tension in the cable pulling the lift?

## A 159 kg rocket moving radially outward from Earth has a

A 159 kg rocket moving radially outward from Earth has a speed of 8.56 km/s when its engine shuts off 198 km above Earth’s surface a. Neglect air resitance. Find rocket’s kinetic energy when the rocket is 298 km above Earth’s surface b. What is the max height that the rocket reaches.

## Calculate the scalar product of the vectors in the figure below.

Calculate the scalar product of the vectors in the figure below. Assume θ1 = 116°, θ2 = 137°, F = 31.7 N and v = 19.3 cm/s.

## A student (m = 70 kg) falls freely from rest and

A student (m = 70 kg) falls freely from rest and strikes the ground. During the collision with the ground, he comes to rest in a time of 0.04 s. The average force exerted on him by the ground is 18000 N, where the upward direction is taken to be the positive direction. From what height did the student fall? Assume that the only force acting on him during the collision is that due to the ground.

## Two rops are attached to a heavy metal I-bean (mass 500

Two rops are attached to a heavy metal I-bean (mass 500 kg). The ropes make angles of 60 degrees with the horizontal. Determine the tension in each rope.

## Communication satellites are placed in geosynchronous orbit, i.e., in circular orbit

Communication satellites are placed in geosynchronous orbit, i.e., in circular orbit such that they complete one full revolution about the earth in one sidereal day (23.934 h), and thus appear stationary with respect to the ground. Determine (a) the altitude of these satellites above the surface of the earth, (b) the velocity with which they describe their orbit. Give the answers in both SI and U.S. customary units.

## A vertical spring with a spring constant of 310 N/m is

A vertical spring with a spring constant of 310 N/m is mounted on the floor. From directly above the spring, which is unstrained, a 0.11-kg block is dropped from rest. It collides with and sticks to the spring, which is compressed by 3.8 cm in bringing the block to a momentary halt. Assuming air resistance is negligible, from what height above the compressed spring was the block dropped

## A neutron star has a mass of 2.20 × 1030 kg

A neutron star has a mass of 2.20 × 1030 kg (about the mass of our sun) and a radius of 5.20 × 103 m. Suppose an object falls from rest near the surface of such a star. How fast would it be moving after it had fallen a distance of 0.0083 m?

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