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A cave rescue team lifts an injured spelunker directly upward and out of a sinkhole by means of a motor-driven cable. The lift is performed in three stages, each requiring a vertical distance of 10.0 m:
(a) The initially stationary spelunker is accelerated to a speed of 5.00 m/s;
(b) He is then lifted at the constant speed of 5.00 m/s;
(c) Finally he is decelerated to zero speed. How much work is done on the 80.0 kg rescue by the force lifting him during each stage?
Two copper blocks, each of mass 1.00kg, initially have differenttemperatures, 20 degree celsius and 28 degree celsius. Estimate the entropy change of each block
A certain atom is ionized so that it only has one electron. The first Lyman line is at about 30 nm. What is the atomic number of the atom
An RL circuit with L = 3 H and an RC circuit with C = 5 µF have the same time constant, What is this common time constant
A 0.400 glider is moving to the right on a frictionless, horizontal air track with a speed of 0.750 when it makes a head-on collision with a stationary 0.150 glider. Find the final kinetic energy of second glider
A plane accelerates from rest at a constant rate of 5.00m/s2 along a runway that is 1800m long. What is the time tTO needed to take off
A 13g rifle bullet traveling 150m/s buries itself in a 3.7 kg pendulum hanging on a 2.9 m long string, which makes the pendulum swing upward in an arc. Resolve the horizontal component of the pendulum's maximum displacement.
The linear momentum of a 1300 kg carincreased by 6.30×103 kg m/s in13.7 s. What is the magnitude of the constant force that accelerated the car? By how much did the speed of the car increase?
Objects with masses of 180 kg and a 480 kg are separated by 0.410 m. Find the net gravitational force exerted by these objects on a 58.0-kg object placed midway between them
an 8.70 kg block slides with an initial speed of 1.66 m/s up aramp inclined at an angle of 27.4 degree with the horizontal. find the distane the block slides before coming to rest
q1.an automobile driver puts on brakes and decelerates from 68 mph to zero in 16 s. what distance does the car travel?a
A marine biologist powers the 800 W, 24 V electric outboard motor on her boart from a 75 A*hr battery. How long can she run the motor before the battery is drained?
A balance scale has unequal arms. The scale is balanced with am = 1.50-kg block on the left panand a M = 2.29 kg block on theright pan (see figure). If the 2.29-kgblock is removed from the right pan and the 1.50-kg block is then moved to the right..
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