### A crate rests on the flatbed of a truck that is initially traveling at 15 m/s on a level road. The driver applies the brakes and the truck brought to a halt in a distance of 38 m. If the deceleration of the truck is constant, what is the minimum coeffic

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**A++ Work! 100% CORRECT PHYSICS TUTORIAL

INCLUDES ANSWERS TO THE FOLLOWING QUESTIONS

1. A crate rests on the flatbed of a truck that is initially traveling at 15 m/s on a level road. The driver applies the brakes and the truck brought to a halt in a distance of 38 m. If the deceleration of the truck is constant, what is the minimum coefficient of friction between the crate and the truck that is required to keep the crate from sliding?

2. The world's largest Ferris wheel with a radius of 50.0 m is located in Yokohama City, Japan. Each of the sixty gondolas on the wheel takes 1.00 minute to complete on revolution when it is running as full speed. Note: Ignore gravitational effects. What is the centripetal acceleration of the gondola when the Ferris wheel is running at full speed?

3. A 100-kg cannon at rest contains a 10-kg cannon ball. When fired, the cannon ball leaves the cannon with a speed of 90 m/s. What is the recoil speed of the cannon?

4. Mike is cutting the grass using a human-powered lawn mower. He pushes the mower with a force of 45 N directed at an angle of 41o below the horizontal direction. Calculate the work that Mike does on the mower each time he pushes it 9.1 m across the yard.

5. A certain crane can provide a maximum lifting force of 25000 N. It hoists a 2000-kg load starting at ground level by applying the maximum force for a 2-second interval; then, it applies just sufficient force to keep the load moving upward at constant speed. Approximately how long does it take to raise the load from ground level to a height of 30 m?

6. Approximately one billion years ago, the Moon orbited the Earth much closer than it does today. The radius of the orbit was only 24400 km. The orbital period was only 23400 s. Today, the average radius is 385000 km; and the present period is 2.36 x 106 s. Assuming that the orbit of the Moon is circular, calculate the ratio of the speed of the Moon in its ancient orbit to the speed that it has today.

7. A car enters a horizontal, curved roadbed of radius 50 m. The coefficient of static friction between the tires and the roadbed is 0.20. What is the maximum speed with which the car can safely negotiate the unbanked curve?

8. A rock is dropped from a high tower and falls freely under the influence of gravity. Which one of the following statements concerning the rock as it falls is true? Neglect the effects of air resistance.

A) The rock will gain an equal amount of momentum during each second

1. A block is dropped from a high tower and is falling freely under the influence of gravity. Which one of the following statements is true concerning this situation? Neglect air resistance.

B) The kinetic energy increases by equal amounts over equal distances

1. What is the acceleration due to gravity at an altitude of 1.00x106 m above the earth's surface? Note: the radius of the earth is 6.38x106 m.

2. A 1500-kg elevator moves upward with constant speed through a vertical distance of 25 m. How much work was done by the tension in the elevator cable?

3. Complete the following statement: The term net force most accurately describes

4. An automobile approaches a barrier at a speed of 20 m/s along a level road. The driver locks the brakes at a distance of 50 m from the barrier. What minimum coefficient of kinetic friction is required to stop the automobile before it hits the barrier?

5. A 0.50-kg bomb is sliding along an icy pond (frictionless surface) with a velocity of 2.0 m/s to the west. The bomb explodes into two pieces. After the explosion, a 0.20-kg piece moves south at 4.0 m/s. What are the components of the velocity of the 0.30-kg piece?

6. A 44-kg child steps onto a scale and the scale reads 430 N. What is the magnitude of the normal force acting on the child?

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