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College Physics
11th Edition
ISBN: 9781305952300
Author: Raymond A. Serway, Chris Vuille
Publisher: Cengage Learning
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A 17,000-kg jet takes off from an aircraft carrier via a catapult. The gases thrust out from the jet's engines exert a constant force of 115 kN on the jet; the force exerted on the jet by the catapult is plotted in the figure.
a) Determine the work done on the jet by the gases expelled by its engines during the launch of the jet.
b) Determine the work done on the jet by the catapult during the launch of the jet.
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- You stand at the top of a cliff and lower a first aid kit (attached to a rope) down the cliff to an injured hiker at a constant speed. What can you say about the work done by the rope and the work done by gravity on the kit as it is lowered? O The work done by the rope is positive and the work done by gravity is positive. The work done by the rope is negative and the work done by gravity is negative. O The work done by the rope is positive and the work done by gravity is negative. O The work done by the rope is zero and the work done by gravity is zero. O The work done by the rope is negative and the work done by gravity is positive.arrow_forwardA 700 kg dragster accelerates from rest to a final speed of 120 m/s in 400 m (about a quarter of a mile) and encounters an average frictional force of 1200 N. What is its average power output in watts and horsepower of the car engine?a) watts= b) horsepower=arrow_forwardTwo people stand on opposite sides of each other (one on the left and one on the right) pulling on a rope in a game of tug of war. The two people pull on the rope with equal and opposite forces. Which of the following is the expected out come for the work done to the system? No work is done on the rope since the rope has no displacement. Each player does equal amount of non-zero work. The rope moves to the right and the work is positive. The rope moves to the left and the work is negative.arrow_forward
- Which of the following statements are true? Select all correct. Question 3 options: If an object speeds up, then the total work done on the object was positive. If an object moves at a constant speed, then the work done by each individual force is zero A force must be parallel to the displacement to do any work. If a force is perpendicular to displacement, it does zero work. If a force has a component in the opposite direction of the displacement, it does positive work. If an object doesn't move, then the work done by every individual force must be zero.arrow_forwardA force FY shown in the figure below acts on a particle moving along the y axis. Each unit in the y(m) axis is equal to 2.0m and each unit in the Fy (N) axis is equal to 3.0N. Determine the work done on the particle by this force as it moves from the following initial to final positions. A. From y=A to y=B B. From y=B to y=C C. From y=A to y=C.arrow_forwardA 5,000 kg airplane at rest reaches a take-off speed of 75 m/s after accelerating down a horizontal runway for 1.25 km. Calculate the average acceleration and average net force exerted on the airplane. For this problem Draw an Energy Bar Chart to solve the problem using the Work-Energy Theorem. W = ½ mv^2 - ½ mvo^2arrow_forward
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