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Get college assignment help at uniessay writers A 2100 kg car traveling to the right at 32 m/s is chasing a second car of the same mass that is traveling to the right at 10 m/s. (a) If the two cars collide and stick together, what is their speed just after the collision? (b) What fraction of the initial kinetic energy of the cars is lost during this collision?

Sam, whose mass is 81 kg, takes off accross level snow in his jet powered skis. The skis have a thrust of 196 N and a coefficient of kinetic friction on snow of 0.1. Unfortunatately, the skis run out of fuel after only 12 s. (a) What is Sam’s top speed? m/s (b) How far has Sam traveled when he finally coasts to a stop? m

A 65-kg swimmer jumps off a 10.0 m tower. The swimmer comes to a stop 2.0 m below the surface. Find the net force exerted by the water.

a magnetic computer disk 8 cm in diameter in initially at rest. a small dot is painted on the edge of the disk. the disk accelerates at 600rad/sec^2 for 1/2 seconds, then coasts at a steady angular velocity for another 1/2 seconds. what is the speed of the dot at t=1s? through how many revolutions has the disk turned?

You shoot a 49-g pebble straight up with a catapult whose spring constant is 310 N/m. The catapult is initially stretched by 0.20 m. How high above the starting point does the pebble fly? Ignore air resistance.

A ship maneuvers to within 2.46×103 m of an island’s 1.80×103 m high mountain peak and fires a projectile at an enemy ship 6.10 × 102 m on the other side of the peak, as illustrated. The ship shoots the projectile with an initial velocity of 2.55×102 m/s at an angle of 74.9◦. The acceleration of gravity is 9.81 m/s2 .

A spring and block are in the arrangement of the figure below. When the block is pulled out to x = 2.0 cm, we must apply a force of magnitude 480 N to hold it there. We pull the block to x = 12.5 cm and then release it.

From the top of a tall building, a gun is fired. The bullet leaves the gun at a speed of 340 m/s, parallel to the ground. As the drawing shows, the bullet puts a hole in a window of another building and hits the wall that faces the window. h is 0.54 m and d is 8.0 m. Assume that the bullet does not slow down as it passes through the window. Determine Distance H

A stone of mass 0.3kg is tied to a string of length 0.75m and is swung in a horizontal circle with speed v. The string has a breaking-point tension of 50N. What is the largest value v can have without the string breaking? Ignore any effects due to gravity.

A roller-coaster car of mass 1700 kg is initially at the top of a rise at point a. It then moves 29.4 m at an angle of 50° below the horizontal to a lower point b. (a) Find both the potential energy of the system when the car is at points a and b and the change in potential energy as the car moves from point a to point b , assuming y = 0 at point b. (b) Repeat part (a), this time choosing y = 0 at point c, which is another 15.0 m down the same slope from point b.

Get college assignment help at uniessay writers when “clockwise” or counterclockwise” is used to describe rotational motion, why is a phrase such as “viewed from above” added?

A professor’s office door is 0.92 {rm m} wide, 2.2 {rm m} high, 4.0 {rm cm} thick; has a mass of 30 {rm kg}, and pivots on frictionless hinges. A “door closer” is attached to door and the top of the door frame. When the door is open and at rest, the door closer exerts a torque of 5.4 {rm N}cdot {rm m}. A: What is the moment of inertia of the door? B: If you let go of the open door, what is its angular acceleration immediately afterward?

Andrea and Chuck are riding on a merry-go-round. Andrea rides on a horse at the outer rim of the circular platform, twice as far from the center of the circular platform as Chuck, who rides on an inner horse. When the merry-go-round is rotating at a constant angular speed, Andrea’s angular speed is which of the following?

The ladder of length, l=15m and mass of 35kg rests against a smooth frictionless wall. The coefficient of friction between the ladder and ground is 0.6 and the ladder makes an angle, theta with the ground equal to 50 degrees. How far up the ladder can an 800N man climb before the ladder begins to slip?

On a very muddy football field, a 100 linebacker tackles an 85 halfback. Immediately before the collision, the linebacker is slipping with a velocity of 8.8 north and the halfback is sliding with a velocity of 7.4 east.

What angular speed (in revolutions per minute) is needed for a centrifuge to produce an acceleration of 720 times the gravitational acceleration 9.8 m/s2 at a radius of 9.95 cm ?

At what angle should a curve of radius 140 m be banked, so cars can travel safely at 33 m/s without relying on friction?

Jeff of the Jungle swings on a 7.6- vine that initially makes an angle of 47 with the vertical. If Jeff starts at rest and has a mass of 88 , what is the tension in the vine at the lowest point of the swing?

A 10 g bullet is fired into a 9.0 kg wood block that is at rest on a wood table. The block, with the bullet embedded, slides 5.0 {rm cm} across the table. The coefficient of kinetic friction for wood sliding on wood is 0.20.What is the speed of the bullet

A 23.0 child plays on a swing having support ropes that are 1.90 long. A friend pulls her back until the ropes are 45.0 from the vertical and releases her from rest

Speedboat A negotiates a curve whose radius is 152 m. Speedboat B negotiates a curve whose radius is 204 m. Each boat experiences the same centripetal acceleration. What is the ratio vA/vB of the speeds of the boats?

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November 3, 2019