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A cave rescue team lifts an injured spelunker directly upward andout of a sinkhole by means of a motor-driven cable. The lift isperformed in three stages, each requiring a vertical distance of15.0 m: (a) the initially stationaryspelunker is accelerated to a speed of 3.30m/s; (b) he is then lifted at theconstant speed of 3.30 m/s; (c) finallyhe is decelerated to zero speed. How much work is done on the 82.0kg rescue by the force lifting him during each stage?
A police car is moving at 37.1 m/s (83.0 mi/h) behind a speeding car that is going faster. How fast is the speeder going
a 15 m beam is supported (hinged supports) at both ends and is loades with a 50 n weight 4 m from one end and a 100 n weight 8 meters from the same end. what are the forces at the two supports
a 1600 kg car is traveling with a speed of 10 m/s. the driver slams on breaks, which give a force of 800 N. How far does the car go before reaching a halt
A wheel with a tire mounted on it rotates at the constant rate of 2.87 times a second. find the tack's tangential speed
An x-ray with wavelength .18 nm is emitted when an L shell electron makes a transition to the K shell. What is the atomic number of the atom
Consider a rectangular swimming pool of depth 1 m with a width and length of 16 m. What is the total force on the bottom of the pool due to the water pressure
the magnetic flux through 20 turn coil with a 100 o resistance changes at a constant rate from -5.8 tm2 to 3.8 tm2 in
A 2.1 kg solid sphere ( I= 0.4mR2 ) rolls along a horizontal surface with a speed of 7.8 m/s. What is the total kinetic energy of the sphere
A place kicker must kick a football from a point 34 m (about 37 yd) from the goal, and the ball must clear the crossbar, which is 3.05 m high. When kicked, the ball leaves the ground with a speed of 23 m/s at an angle of 55 to the horizontal. By how..
An airplane travels a distance 270 m down the runway before taking off. If it starts from rest, moves with a constant acceleration, what is its speed when it takes off
a rock is dropped from a tall bridge into the water below. if the rock begins with a speed of zero and has a speed of
A 3.60 long, 420 steel beams extends horizontally from the point where it has been bolted to the framework of the new building under construction. A 72.0 construction worker stands at the far end of the beam. What is the magnitude of torque about the..
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