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Power – problems and solutions. Power is the rate at which work is done in a given period. Mathematically, power is the work/time ratio. P = W/t. Description: P = power (Joule/second = Watt), W = work (Joule), t = time interval (second) Based on this equation, it can be concluded that the greater the work rate, the greater the power.
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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
Let’s consider an example that can help illustrate the differences among work, force, and power. Suppose the woman in Figure 9.3 lifting the TV with a pulley gets the TV to the fourth floor in two minutes, and the man carrying the TV up the stairs takes five minutes to arrive at the same place.
Use work and energy principles to calculate a speed or a height or an energy value. Most problems include little to no little scaffolding. Includes 10 problems.
- Which among the following formulas is used to find power? Power = Force + Velocity. Power = 2(Force – Velocity) Power = Force / Velocity. Power = Force * Velocity.
- Fill in the blanks: Watt is the SI unit of _____ Luminosity. Temperature. Power. Angle. Answer: c) Power. Explanation: The SI unit of power is Watt (W).
- One horsepower is equivalent to approximately _____ 845.7 watts. 745.7 watts. 645.7 watts. 545.7 watts. Answer: b) 745.7 watts. Explanation: Horsepower is used to define the power delivered by a machine, and it is approximately equal to 745.7 watts.
- Define average power. Average power is explained as the total energy consumed divided by the total time taken.
Use your understanding of work and power to answer the following questions. When finished, click the button to view the answers. 1. Two physics students, Will N. Andable and Ben Pumpiniron, are in the weightlifting room.
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Follow along with common work and power example problems and solutions. See how to solve problems when force is applied directly parallel or at an angle. Example Work and Power Problems. 1. How much work is done by the stickman that pushes a box 5 meters with a force of 12 Newtons forward? W = (F) (d)
