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in potential energy? 21) A 15.0 kg model plane flies horizontally at a constant speed of 12.5 /ms. a) Calculate its kinetic energy. b) The plane goes into a dive and levels off 20.4 m closer to Earth. How much potential energy does it lose during the dive? Assume no additional drag. c) How much kinetic energy does the plane gain during the dive?
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Renatta Gass is out with her friends. Misfortune occurs and Renatta and her friends find themselves getting a workout. They apply a cumulative force of 1080 N to push the car 218 m to the nearest fuel station. Determine the work done on the car. 1. Audio Guided Solution
Hans Full is pulling on a rope to drag his backpack to school across the ice. He pulls upwards and rightwards with a force of 22.9 Newtons at an angle of 35 degrees above the horizontal to drag his backpack a horizontal distance of 129 meters to the right. Determine the work (in Joules) done upon the backpack. 1. Audio Guided Solution
Lamar Gant, U.S. powerlifting star, became the first man to deadlift five times his own body weight in 1985. Deadlifting involves raising a loaded barbell from the floor to a position above the head with outstretched arms. Determine the work done by Lamar in deadlifting 300 kg to a height of 0.90 m above the ground. 1. Audio Guided Solution
Sheila has just arrived at the airport and is dragging her suitcase to the luggage check-in desk. She pulls on the strap with a force of 190 N at an angle of 35° to the horizontal to displace it 45 m to the desk. Determine the work done by Sheila on the suitcase. 1. Audio Guided Solution
While training for breeding season, a 380 gram male squirrel does 32 pushups in a minute, displacing its center of mass by a distance of 8.5 cm for each pushup. Determine the total work done on the squirrel while moving upward (32 times). 1. Audio Guided Solution
During the Powerhouse lab, Jerome runs up the stairs, elevating his 102 kg body a vertical distance of 2.29 meters in a time of 1.32 seconds at a constant speed. a. Determine the work done by Jerome in climbing the stair case. b.Determine the power generated by Jerome. 1. Audio Guided Solution
A new conveyor system at the local packaging plan will utilize a motor-powered mechanical arm to exert an average force of 890 N to push large crates a distance of 12 meters in 22 seconds. Determine the power output required of such a motor. 1. Audio Guided Solution
The Taipei 101 in Taiwan is a 1667-foot tall, 101-story skyscraper. The skyscraper is the home of the world’s fastest elevator. The elevators transport visitors from the ground floor to the Observation Deck on the 89th floor at speeds up to 16.8 m/s. Determine the power delivered by the motor to lift the 10 passengers at this speed. The combined ma...
The ski slopes at Bluebird Mountain make use of tow ropes to transport snowboarders and skiers to the summit of the hill. One of the tow ropes is powered by a 22-kW motor which pulls skiers along an icy incline of 14° at a constant speed. Suppose that 18 skiers with an average mass of 48 kg hold onto the rope and suppose that the motor operates at ...
The first asteroid to be discovered is Ceres. It is the largest and most massive asteroid is our solar system’s asteroid belt, having an estimated mass of 3.0 x 1021kg and an orbital speed of 17900 m/s. Determine the amount of kinetic energy possessed by Ceres. 1. Audio Guided Solution
Kinetic Energy Practice Problems 1. What is the Kinetic Energy of a 150 kg object that is moving with a speed of 15 m/s? KE = ½ mv2 KE = ? m = 150kg v = 15m/s KE = ½ (150kg) (15 m/s)2 KE = ½ (150kg)(225) KE = 16875J 2. An object has a kinetic energy of 25 J and a mass of 34 kg , how fast is the object moving? KE = ½ mv2 KE = 25J m = 34kg v = ?
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For each problem, write the formula used, show your work, & write your answer with correct units. Example: An 80kg man is jogging at a rate of 4m/s. He has kinetic energy. Calculate it: Kinetic Energy = ½ x mass x velocity2 Kinetic Energy = ½ x 80kg x (4m/s)2 Kinetic Energy = ½ x 80 x 16 Kinetic Energy = 40 x 16 Kinetic Energy = 640 J 1.
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We have 20 ready-to-use problem sets on the topic of Work, Energy, and Power. These problem sets focus on the use of energy principles to mathematically analyze systems involving the motion of objects. Click a link to open a publicly-available problem set.
Physics Honors Work & Energy 2015-16 Page 6 of 14 Conservation of Energy Worksheet 1. A marble (.5 kg) is released (down a ramp) from rest 1.5 m above floor level. Find the marble's speed at the bottom of the ramp. Show all calculations here 2. A skier rests on top of a 50m hill. The skier's mass if 60 kg. Ignoring friction, calculate the
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8. The following diagram shows 5 different energy levels (n) that electrons can occupy. Use the diagram to answer each of the following questions: a. EXAMPLE Give a situation that could result in an electron making a quantum leap. An electron gains energy and moves from n=1 to n= 3. b. Give a situation that would result in an electron giving ...
