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A boy in a wheelchair (total mass 51.0 kg) has speed 1.40 m/s at the crest of a slope 2.40 m high and 12.4 m long. At the bottom of the slope his speed is 6.10 m/s. Assume air resistance and rolling resistance can be modeled as a constant friction force of 41.0 N. Find the work he did in pushing forward on his wheels during the downhill ride.
A 95 g ice cube at 0°C is heated until 85 g has become water at 100°C, How much energy was added to accomplish the transformation
The flywheel of a steam engine begins to rotate from rest with a constant angular acceleration of 1.43 rad/s2. It accelerates for 31.5 s, then maintains a constant angular velocity
A 240g air track glider is connected to a string hanging over a frictionless pulley. find the acceleration of the hanging mass
A solid bowling ball with a radius of 10.9 cm and a mass of 7.1 kg rolls along a bowling alley at a linear speed of 3.0 m/s. What is its translational kinetic energy
The front end of an automobile has been designed so that upon impact it progressively crumples by as much as .70m. What is the magnitude of the deceleration
An object oscillates in 1-D with an amplitude of 10 cm. At t = 0 s, its position is x = - 5 cm, What is the velocity of the object
A beam of 16MeV deuterons (m=2mp) from a cyclotron falls on a copper block. The beam is equivalent to a current of 15 microA, At what rate do deuterons strike the block
Compute the Force of Friction (Ff) for a 5kg aluminium block being pulled with constant velocity (uniform motion), up the steel plank that is at a 30degrees angle to the horizontal.
A 11.3-kg cylinder rolls without slipping on a rough surface. At an instant when its center of gravity has a speed of 10.7 m/s, find the translational kinetic energy of its center of gravity
How much is the spring compressed?
The gravitational force exerted on a baseball is 2.11 N down. A pitcher throws the ball horizontally with velocity 15.0 m/s by uniformly accelerating it along a straight horizontal line for a time interval of 174 ms. The ball starts from rest.
A train 350 m long is moving on a straight track with a speed of 81.0 km/h. determine how long the train blocked the crossing. Disregard the width of the crossing
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