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- Assume g = 10 m/s² A 0.27 kg toy car is moving at 3.6 m/s when it rolls over a rug. It leaves the rug at 1.9 m/s. How much work did the rug do on the car? system or add energy to a system. J Remember, work can either remove energy from a If the coefficient of friction (u) is 0.15, how far does the car move across the rug? m How long was the toy car on the rug? S Submit QuestionThe electric motor of a model train accelerates the train from rest to 0.560 m/s in 33.0 ms. The total mass of the train is 775 g. Find the average power delivered to the train during its acceleration. WA cart for hauling ore out of a gold mine has a mass of 445 kg, including its load. The cart runs along a straight stretch of track that climbs a shallow 4.87° incline. A d.. B Track Rope Track incline .Horizontal ground Find the work Wa that the donkey performs on the cart during this process. Find the work Wg that the force of gravity performs on the cart during this process. Calculate the work Wf done on the cart by friction during this process. A donkey, which is trudging along and to the side of the track, has the unenviable job of pulling the cart up the slope with a 461 N force for a distance of 179 m by means of a rope that is parallel to the slope but makes an angle of 15.1° with the track. Model the rolling resistance of the cart as though it were sliding on the track with a coefficient of friction of 0.0171. Use g = 9.81 m/s², and note that angle A in the image is the angle of the incline while angle B is the angle the rope makes with the track. W₁ = Wg = W₁ = J J J
- Show full workMark and David are loading identical cement blocks onto David's pickup truck. Mark lifts his block straight up from the ground to the truck, whereas David slides his block up a ramp on massless, frictionless rollers. Which statement is true? O Mark does more work than David. David does more work than Mark. O Mark and David do the same amount of work. O None of these statements is necessarily true because of the angle of the incline is unknown. O None of these statements is necessarily true because the mass of one block is not given.A weightlifter works out at the gym each day. Part of her routine is to lie on her back and lift a 40 kg barbell straight up from chest height to full arm extension, a distance of 0.50 m.a. How much work does the weightlifter do to lift the barbell one time?b. If the weightlifter does 20 repetitions a day, what total energy does she expend on lifting, assuming a typical efficiency for energy use by the body.c. How many 400 Calorie donuts can she eat a day to supply that energy?
- Problem 11 A cable of density p pounds per foot is used to lift w pounds of coal up a mineshaft that is 1025 feet deep. How much work is done in this process? Answer should be in terms of p and w.A. Suppose you lift a 15 kg box by a height of 1.0 m. How much work do you do in lifting the box? Express your answer using two significant figures. B. Instead of lifting the box straight up, suppose you push it up a 1.0-m-high ramp that makes a 30 ∘ degree angle with the horizontal, as shown in (Figure 1). Being clever, you choose a ramp with no friction. How much force is required to push the box straight up the slope at a constant speed? Express your answer using two significant figures. C. How long is the ramp? Express your answer using two significant figures. D. Use your force and distance results to calculate the work you do in pushing the box up the ramp. Express your answer using two significant figures.If a blow dryer uses 1.1 x 10³ J of energy, and it is in use for 15 minutes, what is its power? the answer is... a. 990 W b. 1.2 W c. 4400 W d. 18 000 W e. 980 W
- A bungee jumper has a mass of 74.3 kg and falls a distance of113 m before the bungee catches and sends the jumper upwards.a. Assuming the jumper starts from rest, find their totalmechanical energyb. Assuming energy is conserved, find the speed of thejumper just before the bungee catchesc. After the bungee catches, the jumper returns to amaximum height of 98.3. How efficient is the bungee inreturning the stored energy to the jumper?I have a good concept on where to start but do not know where to go from there.The work performed as a function of time for a certain process is given by: W = at3, where a = 2 J/s³. The instantaneous power output (measured in Watts) at t = 1 sec is: %3D А. 24 В. 69 C. 54 D. 207 E. 6