15. A box is moved from the floor up to a tabletop but gains no speed in the process. Is there work done on the box, and if so, what has happened to the energy added to the system?
Q: 6. A standard baseball has around 146 g. If a ball comes off a bat with 30 W of kinetic energy, how…
A: Note: The unit of kinetic energy mentioned in the question is incorrect, considering the unit of…
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Q: A 60kg woman does a step-up/step-down task using a 25cm platform. A full step cycle consists of a…
A: Given, mass=60 kg h=25 cm =0.25 m a. Energy needed to complete 1 step-up= mgh=60×9.8×0.25=147…
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A: Given:- 13 ) The mass of the blood m = 1.0 kg [ Given ] The height h = 1.0 m [ Given ] Find:-…
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Q: A car (m=1000 kg) is initially moving at a speed of 20 m/s (~45 mph) when the driver hits the brakes…
A: Work done is equal to change in kinetic energy W=∆EK=12mvf2-vi2=121000 kg0-20 ms2=-200000 J=-200 kJ
Q: A 75 kg skier starts with an initial speed of 2 m/s down a 40 m high ramp. They launch off a ramp…
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Q: 4. A 73 kg skier starts at rest at the top of a 100 m high hill. He skies down this hill and back up…
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Q: Question 9) During a board game called Rat TrapO, mechanical contraptions are activated in a…
A: Recall U=mgh KE=1/2mv2 by conservation of energy.
Q: The engine of a car generates a constant power P. If the car starts from rest, and after t seconds…
A: Power generated by the vehicle is The vehicle starts from rest, that is, initial velocity is After…
Q: You give a 5.0 kg box a quick shove up a ramp. It reaches a vertical height of 3.0 m before…
A: m = 5 kg h = 3 m vf = 0 m/s (Eth)f = 100 J g = 10 m/s2
Q: A AA battery is used to power a motor that raises a 10-g pencil tied to a string 33 meters until it…
A: Mass m of the pencil =10g=0.01kgheight h through which it is raised = 33mg the acceleration due to…
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A: The energy possessed by an object , which is in motion , with velocity v is known as the kinetic…
Q: hill Scale 1.0 cm = 3.0 m Second hill Third hill End of ride a) Potential energy at the maximum…
A: Given, H1 = 24 m H2 = 17 m H3 = 12 m M = 149 kg a) potential energy at the maximum height…
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Q: A 899 kg car accelerates from rest up to 26.0 m/s in 6.14 s. What is the average power output of…
A: The mass of the car is m = 899 kg. The initial velocity of the car is denoted by u = 0 m/s. The…
Q: 1. A box with a mass of 3.0 kg is accelerated from rest by a constant force across a floor at a rate…
A:
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- A car engine produces a constant power of P = 341 hp. The car and motor have a combined mass of m = 1830 kg. 1.) The car starts from rest, after t=5 seconds, what is the cars speed, you may assume no energy is required to spin the tires. 2.) Assume a dragster of mass m=1000kg can accelerate to cover 450 m and accelerate in 7.2 s from a dead stop, how much horsepower is the engine producing, assuming acceleration is constant?3. A 26.00-kg child initially at rest slides down a playground slide from a height of 3.20 m above the bottom of the slide. If her speed at the bottom is 2.80 m/s, how much energy is lost due to friction? J cci16 f16 cci16 ceil6 cci3. A 60 kg boy does 60 push-ups in 40 s. With each push-up he must lift an average of 70 % of his mass a height of 40 cm off the floor. Calculate the following: a) the work the boy does for each push-up, assuming he does work only when he pushes up b) the total work done in 40 s c) the power for this period
- 2. Mikey sees that the right front tire (m 30.0 kg) of Granny's car has landed in front of him. He picks it up and runs for 40 m at a constant velocity of 2.0 m/s to return it to her. How much work did Mikey do on the tire from 10 m to 20 m into his run? =4. This Olympic skeleton athlete slides down an icy track head first. The track has many twists and turns with a total height of 102.75 m. If the 99.375 kg man has a speed of 27 m/s at the bottom, what was the total work done on him by friction and air resistance slowing him down? (In other words, what was the energy lost to friction and air resistance?) He starts from rest at the top. Previous submissions:1. A 23.0 kg child is playing on a swing with a length of 2.5 m. If the swing starts from rest and makes an angle of 40.0◦ with the vertical at the top of the swing, a) determine the child’s speed at the bottom of the swing neglecting friction. b) If the swing has a speed of 2.8 m/s at the bottom, determine the work done by friction during the downswing and, bonus) assuming the force of friction is constant, determine the maximum angle the swing attains on the upswing after passing through the bottom. Hint: Use the approximation that cos θ ≈ 1 − 1 2 θ 2 for angles given in radians.