WWW.MIAMI-BEST-MATH-TUTOR.COM PHYSICS.I.PRACTICE.PROBLEMS.SET.2.1 PAGE 1 OF 12 WWW.MIAMI-BEST-MATH-TUTOR.COM E-MAIL: [email protected]CONTACT NUMBER: (786)556-4839 PRACTICE PROBLEMS SET 2.1 1. A child does 350 J of work while pulling a box from the ground up to his tree house with a rope. The tree house is 6.9 m above the ground. What is the mass of the box? 4.7 kg 3.1 kg 5.2 kg 5.2 kg a b c d
This document is posted to help you gain knowledge. Please leave a comment to let me know what you think about it! Share it to your friends and learn new things together.
CONTACT NUMBER: (786)556-4839 PRACTICE PROBLEMS SET 2.1
1. A child does 350 J of work while pulling a box from the ground up to his tree house with a rope. The tree house is 6.9 m above the ground. What is the mass of the box?
2. A futuristic design for a car is to have disk-like flywheel within the car storing kinetic energy. The flywheel has mass 370 kg with a radius of 0.50 m and can rotate up to 340 rev/s. Assuming all of this stored kinetic energy could be transferred to the linear velocity of the 3200-kg car, find the maximum attainable speed of the car.
3. A pitcher is employing a ballistic pendulum to determine the speed of his fastball. A 5.3 kg lump of clay is suspended from a cord 2.0 m long. When the pitcher throws his fastball aimed at the clay, the ball becomes embedded in the clay and the two swing up to a maximum height of 0.10 m. If the mass of the baseball is 0.21 kg, use conservation of momentum and energy to find the speed of the pitch.
4. A 12.0-g rifle bullet is fired with a speed of 762 m/s into a ballistic pendulum with mass 6.00 kg, suspended from a cord 70.0 cm long. Compute the vertical height through which the pendulum rises; the initial kinetic energy of the bullet and pendulum immediately after the bullet becomes embedded in the pendulum.
5. A rifle bullet with mass 8.00 g strikes and embeds itself in a block with mass 0.992 kg that rests on a frictionless, horizontal surface and is attached to a coil spring. The impact compresses the spring 15.0 cm. Calibration of the spring shows that a force of 0.750 N is required to compress the spring 0.250 cm. Find the magnitude of the block’s velocity just after impact. What was the initial speed of the bullet?
6. A 5.00-g bullet is shot through a 1.00-kg block suspended on a string 2.000 m long. The center of mass of the block rises a distance of 0.45 cm. Find the speed of the bullet as it emerges from the block if its initial speed is 450 m/s.
7. A 5.00-g bullet is fired horizontally into a 1.20 kg wooden block resting on a horizontal surface. The coefficient of friction between the surface and the block is 0.200. The bullet remains embedded in the block, which is observed to slide 0.230 m along the surface before stopping. What was the initial speed of the bullet?
8. You have just landed on Planet Y where the acceleration due to gravity is different from Earth. You take out a basketball that weights 14.7 N on the surface of Earth, release from rest form a height of 10.0 m, and measure that it takes 2.6 s to reach the ground. How much does the ball weigh on the surface of Planet Y?
11. In a shuffleboard game, the puck slides a total of 12 m before coming to rest. If the coefficient of kinetic friction between the puck and board is 0.25, what was the initial speed of the puck?
12. Two paint buckets of mass 12.0 kg and 4.0 kg are connected by a lightweight rope passing over a pulley of negligible mass and friction. The system is released from rest with the 12.0 kg bucket 2.00 m above the floor. Use energy conservation to find the speed with which this bucket strikes the floor.