You are working out on a rowing machine. Each time you pull the rowing bar (which simulates the oars) toward you, it moves a distance of 1.20 m in a time of 1.80 s. The readout on the display indicates that the average power you are producing is 102 W. What is the magnitude of the force that you exert on the handle? i
Q: You are working out on a rowing machine. Each time you pull the rowing bar (which simulates the…
A: Displacement (d) = 1.30 mTime (t) = 1.50 sPower (P) = 97.0 WRequired:Force (F)
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of 1.20 m in a time of 1.80 s. The readout on the display indicates that the average power you are producing is 102 W. What is the
magnitude of the force that you exert on the handle?
i
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- Power of the Human Heart. The human heart is a powerful and extremely reliable pump. Each day it takes in and discharges about 7500 L of blood. Assume that the work done by the heart is equal to the work required to lift this amount of blood a height equal to 1.5 m. The density (mass per unit volume) of blood is 1050 kg/m3 . What is the heart's power output. Use g = 9.8m/s2 Calculate answer to one decimal.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?An arrow of mass 0.0348 kilograms is placed on a bow, and the string is drawn back 0.533 meters with an average force of 143 newtons. a. With what speed does the arrow leave the bow? b. If the arrow is shot straight up, how high does it rise? Solve using the law of conservation of energy, not a constant acceleration equation.
- You throw a basketball straight up into the air with an initial velocity of 5.6 m/s. The ball leaves your hand 1.2 meters above the ground. It moves upwards, stops, and then goes all the way down until it hits the ground (below the height you threw from).A. Use conservation of energy (and not the kinematics equations) to calculate the velocity of the ball the instant before it hits the ground.A 2.46 kg block moves along a frictionless surface with a speed of 7.83 m/s when it encounters a rough shallow hill, whose sides have a length of l=5.21 m. The hill is low enough so that the block can make it over the hill. Because the surface of the hill is rough (shown in orange in the figure), the block experiences a frictional force of 2.23 N while on the hill. a) What is the speed of the block after it traverses the hill?Question 8 Two horses are used to pull a canal boat as shown in the figure. Each horse produces exactly 1 hp (745.7 W). The boat moves at a constant at a constant velocity of 1.69 m/s. If the angle between the motion of the boat and each of the ropes is 0 = 39.21°, then what is the tension in each rope? (809) A) O697.99 N B) 0540.82 N C) O1138.93N D) O284.73 N E) O569.47 N
- speed will be v=3.76ms A water skier is being pulled by a tow rope attached to a boat. As the driver pushes the throttle forward, the skier accelerates. A 72kg water skier has an initial speed of 6.0m/s. 5.0 seconds later, the speed increases to 11.2m/s. What is the net work done on the water skier? If we assume the efficiency in converting kinetic energy from the boat to the water skier is only 20%, what is the power of the boat? What is the amount of work done by the resistive force during the 5-second period? Answer: W =m(v -v)- 3219.84J × 3.2×10°J net 3219.84J The power of the boat will be P=- = 3.2x10 W 0.2x5s =-3.2×10'W×0.8×5s =-1.3×10ʻJ resistive W. 3If a ski lift raises 150 passengers averaging 690 N in weight to a height of 126 m in 45.9 s, at constant speed, what average power is required of the force making the lift? Number i 270096 eTextbook and Media Units WSituation 02. A crate has a mass of 120kg and the coefficient of static and kinetic friction is 0.60 and 0.50, respectively. The crate starts from rest and the motor exerts a tension T= 1220 + 200t (N). If the elevation of the dock is 30 degrees from the horizontal, a. What is the velocity of the crate after 1sec? b. Compute the power transmitted after 1sec.
- THANK YOUA horizontal carousel is rotating around its axis with constant angular velocity w. On the carousel there is a straight track passing through its middle. A cart of mass m is traveling along the track with constant velocity v relative to the carousel. Note that there is friction between the cart and the carousel. FR XRA box of mass 4.0 kg hangs by a cable from the ceiling of an elevator. The elevator is moving up at a steady speed of 5.0 m/s for 8.0 m. Use g = 10 m/s2. Match the answers with questions. the final kinetic energy of the box (Kf) the change in kinetic energy of the box (ΔK) A. 320 J B. 20 J C. -320 J D. -20 J E. 50 J F. -50 J G. 0 J