The loaded cab of an elevator has a mass of 3.80 × 103 kg and moves 196. m up the shaft in 23.0 s at constant speed. At what average rate does the force from the cable do work on the cab? Number i Units
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- Some gliders are launched from the ground by means of a winch, which rapidly reels in a towing cable attached to the glider. What average power must the winch supply in order to accelerate a 185-kg ultralight glider from rest to 24.3 m/s over a horizontal distance of 56.2 m? Assume that friction and air resistance are negligible, and that the tension in the winch cable is constant. Number i UnitsA 89 kg block is pulled at a constant speed of 5.2 m/s across a horizontal floor by an applied force of 105 N directed 45° above the horizontal. What is the rate at which the force does work on the block? Number i UnitsPart d and e
- A person is making homemade ice cream. She exerts a force of magnitude 16 N on the free end of the crank handle on the ice-cream maker, and this end moves on a circular path of radius 0.27 m. The force is always applied parallel to the motion of the handle. If the handle is turned once every 1.6 s, what is the average power being expended? W on Submit Answer so B 9 Type here to search bp 米 f4 IDI esc f6 10 fa fg f10 1- # 24 & 2 3 4 8. Q tab E R T YThe last word of the sentence in the picture is "particle" a. Find the work done by the force using a dot product. b. Find the angle between the force and displacement.A 31.0-kg child on a 4.00-m-long swing is released from rest when the ropes of the swing make an angle of 28.0° with the vertical. (a) Neglecting friction, find the child's speed at the lowest position. m/s (b) If the actual speed of the child at the lowest position is 2.60 m/s, what is the mechanical energy lost due to friction? J
- A 6.00 kg box is pulled up an 8.00 m long incline (with friction) at an angle of 30.0 degrees by a force of 50.0 N parallel to the incline. The coefficient of kinetic friction is 0.100. The work done against friction is Multiple Choice 26.5 J. 40.7 J. 35.2 J. 30.3 J. 22.0 J.1.A person is pushing a box across a floor. Can the frictional force on the box ever exceed its own weight? Can the frictional force ever exceed the applied force? Illustrate and solve the following problems. 2. A 500 – N box is pushed across a horizontal floor with a force of 250 N. The coefficient of kinetic friction is 0.40. (a) Find the work done in pushing the box 20 m. (b) How much work went into overcoming friction and how much into accelerating the box? 3. A 60-lb wooden box is pushed a distance of 50 ft on a horizontal stone floor by a force just sufficient to overcome the friction between box and floor. The coefficient of kinetic friction is 0.40. (a) What is the required force? (b) How much work does the force do? 4. A horizontal force of 5.0 N is used to push a box up a ramp 5.0 m long that is at an angle of 15° above the horizontal. How much work is done by the force? 5. A weightlifter raises a 150-kg barbell from the floor to a height of 2.2 m in 0.80 s. What is his…6.)
- PractA 160 kg block is pulled at a constant speed of 1.5 m/s across a horizontal floor by an applied force of 102 N directed 17° above the horizontal. What is the rate at which the force does work on the block? Number i UnitsA block rests on a horizontal frictionless surface. A string is attached to the block, and is pulled with a force of 45.0 N at an angle 0 above the horizontal, as shown in the figure. After the block is pulled through a distance of 1.50 m, its speed is 2.60 m/s, and 40.0 J of work has been done on it. F = 45.0 N v=0 0 v = 2.60 m/s -1.50 m- a. What is the mass of the block? b. What is the angle 8?