A machine rated at 2500 W lifts a 150 kg object 40 m vertically in 1 minute. What is the efficiency of this machine
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A machine rated at 2500 W lifts a 150 kg object 40 m vertically in 1 minute. What is the efficiency of this machine
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- 10) (a) What is the efficiency of an out-of-condition professor who does 2.10 ✕ 105 J of useful work while metabolizing 510 kcal of food energy? _____% (b) How many food calories (in kcal) would a well-conditioned athlete metabolize in doing the same work with an efficiency of 25%? _____kcalA 10,000 kg streetcar starts from rest when the conductor powers on the electric drive motor. If this power is maintained at a constant 5 kW and if the mechanical efficiency of the motor is 90%, how long does the streetcar take to reach a speed of 15 km/hr? Neglect wind resistance. ao OO OO OODeep in the forest, a 17.0-g leaf falls from a tree and drops straight to the ground. If its initial height was 5.30 m and itsspeed just before landing was 1.3 m>s, how much nonconservative work was done on the leaf?
- 46. A power output of 18.0 h.p. is required to overcome friction and move a certain car at a constant speed of 55.0 mph. The car runs on gasoline that has an energy content of 110 MJ per gallon. The efficiency of the engine/transmission is 15%. (a) What is the force of friction on the car? (b) What power input is required at 55.0 mph? (c) How much energy is wasted every minute at 55.0 mph? (d) Determine the fuel economy in miles per gallon.. A 20 meter long ramp is used to move a box weighing 1200N into a truck that is 5 meters off the ground. It only takes you 390 N to push the box up the ramp. Calculate the efficiency of the inclined plane.Two blocks are released from rest on either side of a frictionless half-pipe (see the Figure below). Block B is less massive than block A. The height HB from which block B is released is less than HA, the height from which block A is released. The blocks collide elastically on the flat section. HA B HB 1) After the collision, which is correct? Block A rises to a height greater than HA and block B rises to a height less than HB. Block A rises to a height less than HA and block B rises to a height greater than HB. Block A rises to height HA and block B rises to height HB. Block A rises to height HB and block B rises to height HA. The heights to which the blocks rise depends on where along the flat section they collide. Submit
- Steven carefully places a m = 1.45 kg wooden block on a frictionless ramp so that the block begins to slide down the ramp from rest. The ramp makes an angle of 0 = 53.3° up from the horizontal. Which forces do nonzero work on the block as it slides down the ramp? ☐ gravity How much total work Wnet has been done on the block after it slides down along the ramp a distance of 1.87 m? Nancy measures the speed of the wooden block after it has gone the 1.87 m down the ramp. Predict what speed u she should measure. Now, Steven again places the wooden block back at the top of the ramp, but this time he jokingly gives the block a big push before it slides down the ramp. If the block's initial speed is 2.00 m/s and the block again slides down the ramp 1.87 m, what should Nancy measure for the speed v of the block this time? ☐ spring friction normal J Wnet = v = m/s v = m/s44. A metal ramp 6.00 m long is tilted 10.0° and is used to load and unload a moving van. Suppose a 20.0 kg box is pushed up the ramp and it slides with a friction coefficient of 0.30. The ramp can be viewed as a "machine" where the useful output is the potential energy gain of the box and the input is the physical work done by the person doing the pushing. (a) Determine the efficiency of the ramp. (b) Determine the ratio of the force needed to lift the box without the ramp to the force needed to push it along the ramp (this is called the mechanical advantage).A 35-kW freight elevator with a total mass of 1950 kilograms rises to a height of 25 metres in 32 seconds. What is the efficiency of the elevator? 45% 43% Option 2 Option 4 46% 44% Option 1 Option 3
- A 75 kg man is travelling at 8.2 m/s on a skateboard at the top of a hill that is 12 m tall. How efficient was the process if his final speed at the bottom of the hill is 11 m/s? Only solve using energy concepts!Ms. Dewitte's son, Theo, slides down a slide, from rest, with a length of 2.00 m at an incline of 50° above the horizontal. He has a mass of 22.0 kg and he reaches the bottom of the slide with a velocity of 2.90 m/s. Briefly explain if total mechanical energy was conserved and what energy transfers otcurred?For exercise, an athlete lifts a barbell that weighs 400 N from the ground to a height of 2.20 m at a constant speed in a time of 1.60 s. What is the metabolic power, in kW (kiloWatts)? Your answer needs to have 2 significant figure, including the negative sign in your answer if needed. Do not include the positive sign if the answer is positive. No unit is needed in your answer, it is already given in the question statement.