# A small, 200 cart is moving at 1.50 on an air

Get college assignment help at uniessay writers A small, 200 cart is moving at 1.50 on an air track when it collides with a larger, 1.00 cart at rest. After the collision, the small cart recoils at 0.890 .

## If the string is 9.5 m long, has a mass of

If the string is 9.5 m long, has a mass of 55 g and is pulled taut with a tension of 9.5 N, how much time does it take for a wave to travel from one end of the string to the other?

## A boat moves through a river at 7.0 m/s relative to

A boat moves through a river at 7.0 m/s relative to the water, regardless of the boat’s direction. If the water in the river is flowing at 3.5 m/s, how long does it take the boat to make a round trip consisting of a 250 m displacement downstream followed by a 250 m displacement upstream? PLEASE HELP

## If a 1500 kg car can accelerate from 30 km/h to

If a 1500 kg car can accelerate from 30 km/h to 55 km/h in 3.0 s, how long will it take to accelerate from 55 km/h to 70 km/h? Assume the power stays the same, and neglect frictional losses.

## An 81.0 spacewalking astronaut pushes off a 660 satellite, exerting a

An 81.0 spacewalking astronaut pushes off a 660 satellite, exerting a 110 force for the 0.450 it takes him to straighten his arms.How far apart are the astronaut and the satellite after 1.40 ?

## If a 1500 car can accelerate from 35 to 50 in

If a 1500 car can accelerate from 35 to 50 in 4.0 , how long will it take to accelerate from 50 to 70 ? Assume the power stays the same, and neglect frictional losses.

## A 280 kg piano slides 4.1 m down a 30° incline

A 280 kg piano slides 4.1 m down a 30° incline and is kept from accelerating by a man who is pushing back on it parallel to the incline (Fig. 6-36). The effective coefficient of kinetic friction is 0.40.

## The coefficient of static friction between rubber car tires and dry

The coefficient of static friction between rubber car tires and dry concrete is 1.05. The maximum speed of a car in a level turn in dry weather is found to be 85.0 km/hr. What is the maximum speed of the car (in km/hr) in the same turn in the rain, when the coefficient of static friction is reduced to 0.720?

## A rock fired at an initial angle of 40° lands 230

A rock fired at an initial angle of 40° lands 230 m downrange on top of a hill that is 19 m above the original launch elevation. (a) Neglecting air resistance, determine the initial speed of the rock Determine the time to reach the maximum height determine the maximum height of the rock

## A horizontal disk, having a rotational inertia I 1 = 0.61

A horizontal disk, having a rotational inertia I 1 = 0.61 kg m 2 , placed parallel to, and onto a smooth horizontal plan. is spinning at an angular speed of w 1 = 22 rad/s . Another disk, with rotational inertia I 2 =0.44kg m 2 spinning at an angular speed w 2 = 32 rad/s is carefully lowerd onto the first disk so that they are coaxial. Due to the friction between their surfaces, after a while, both disks spin at the same angular speed. Calculate the work done by the frictional torque. (sign is important)

## an automobile engine slows down from 4500 rpm to 1200 rpm

Get college assignment help at uniessay writers an automobile engine slows down from 4500 rpm to 1200 rpm in 2.5s. calculate its angular acceleration, assumed constant, and the total number of revolutions the engine makes in this time.

## A 9.15 g bullet is fired horizontally into a 0.989 kg

A 9.15 g bullet is fired horizontally into a 0.989 kg wooden block resting on a hor- izontal surface (μ = 0.213). The bullet goes through the block and comes out with a speed of 393 m/s. If the block travels 2.29 m before coming to rest, what was the initial speed of the bullet? The acceleration of gravity is 9.8 m/s2 . Answer in units of m/s.

## A parachutist with a camera, both descending at a speed of

A parachutist with a camera, both descending at a speed of 13 m/s, releases that camera at an altitude of 110 m. How long does it take the camera to reach the ground?

## A 1800 kg race car moving with a constant speed of

A 1800 kg race car moving with a constant speed of 62 m/s completes one lap around a circular track in 58 s. What is the magnitude of the acceleration of the race car? (Answer in units of m/s2.)

## A diver 55 m deep in 10 degrees Celcius fresh water

A diver 55 m deep in 10 degrees Celcius fresh water exhales a 1.5-cm-diameter bubble. What is the bubble’s diameter just as it reaches the surface of the lake, where the water temperature is 20 degrees Celcius? Assume that the air bubble is always in thermal equilibrium with the surrounding water

## A woman rides a carnival Ferris wheel at radius 16 m,

A woman rides a carnival Ferris wheel at radius 16 m, completing 4.1 turns about its horizontal axis every minute. What are (a) the period of the motion, and the magnitude of her centripetal acceleration at (b) the highest point and (c) the lowest point?

## a centrifuge in a medical laboratory rotates at an angular speed

a centrifuge in a medical laboratory rotates at an angular speed of 3,900 rpm. When switched off, it rotates 65 times before coming to rest. Find the constant angular acceleration of the centrifuge

## Three objects with masses m1 = 6.0 kg, m2 = 10.0

Three objects with masses m1 = 6.0 kg, m2 = 10.0 kg, and m3 = 18.0 kg, respectively, are attached by strings over frictionless pulleys, as indicated in Figure P5.32. The horizontal surface is frictionless and the system is released from rest. Using energy concepts, find the speed of m3 after it moves down a distance of 6.0 m.

## A 2216 kg pile driver is used to drive a steel

A 2216 kg pile driver is used to drive a steel beam into the ground. The pile driver falls 5.3 m before contacting the beam, and it drives the beam 20 cm into the ground before coming to rest. Using energy considerations, calculate the average force the beam exerts on the pile driver while the pile driver is brought to rest.

## Consider a light rod of negligible mass and length L=8.1 m

Consider a light rod of negligible mass and length L=8.1 m pivoted on a frictionless horizontal bearing at a point O. Attached to the end of the rod is a mass M1=2kg. Also, a second mass M2=2kg of equal size is attached to the rod (4/7 L from the lower end), as shown in the figure below. The acceleration of gravity is 9.8 m/s^2. What is the period of this pendulum in the small angle approximation? Answer in units of s.

## An incompressible fluid flows steadily through a pipe that has a

An incompressible fluid flows steadily through a pipe that has a change in diameter. The fluid speed at a location where the pipe diameter is 8 cm is 1.28 m/s. What is the fluid speed at a location where the diameter has narrowed to 4 cm?

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