Q: (a) A 75 - kg man steps out a window
(a) A 75 - kg man steps out a window and falls (from rest) 1.0 m to a sidewalk. What is his speed just before his feet strike the pavement? (b) If the man falls with his knees and ankles locked, the o...
See AnswerQ: A toy gun uses a spring to project a 5.3
A toy gun uses a spring to project a 5.3 - g soft rubber sphere horizontally. The spring constant is 8.0 N/m, the barrel of the gun is 15 cm long, and a constant frictional force of 0.032 N exists bet...
See AnswerQ: Two objects (m1 = 5.00 kg and m2 =
Two objects (m1 = 5.00 kg and m2 = 3.00 kg) are connected by a light string passing over a light, frictionless pulley as in Figure P5.69. The 5.00 - kg object is released from rest at a point h = 4.00...
See AnswerQ: A 3.50 - kN piano is lifted by three workers
A 3.50 - kN piano is lifted by three workers at constant speed to an apartment 25.0 m above the street using a pulley system fastened to the roof of the building. Each worker is able to deliver 165 W...
See AnswerQ: A 2.00 x 102 - g particle is released from
A 2.00 x 102 - g particle is released from rest at point A on the inside of a smooth hemispherical bowl of radius R = 30.0 cm (Fig. P5.71). Calculate (a) Its gravitational potential energy at A relati...
See AnswerQ: The particle described in Problem 71 (Fig. P5.71
The particle described in Problem 71 (Fig. P5.71) is released from point A at rest. Its speed at B is 1.50 m/s. (a) What is its kinetic energy at B? (b) How much mechanical energy is lost as a result...
See AnswerQ: A weightlifter lifts a 350-N set of weights from ground
A weightlifter lifts a 350-N set of weights from ground level to a position over his head, a vertical distance of 2.00 m. How much work does the weightlifter do, assuming he moves the weights at const...
See AnswerQ: In terms of saving energy, bicycling and walking are far more
In terms of saving energy, bicycling and walking are far more efficient means of transportation than is travel by automobile. For example, when riding at 10.0 mi/h, a cyclist uses food energy at a rat...
See AnswerQ: A 50.0 - kg student evaluates a weight loss program
A 50.0 - kg student evaluates a weight loss program by calculating the number of times she would need to climb a 12.0 - m high flight of steps in order to lose one pound (0.45 kg) of fat. Metabolizing...
See AnswerQ: A ski jumper starts from rest 50.0 m above the
A ski jumper starts from rest 50.0 m above the ground on a frictionless track and flies off the track at an angle of 45.0° above the horizontal and at a height of 10.0 m above the level ground. Neglec...
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