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A rope is used to pull a 6.18 kg block at constant speed 2.08 m along a horizontal floor. The force on the block from the rope is 5.70 N and directed 13.6° above the horizontal. What are (a) the work done by the rope's force, (b) the increase in thermal energy of the block-floor system, and (c) the coefficient of kinetic friction between the floor and block?
Determine the mass of an electron where de Broglie wavelength is 1 nm moving at speed of 730000 meter per second
If an electron makes a transition from the n = 6 Bohr orbit to the n = 2 orbit, determine the wavelength of the photon created in the process
A boat takes 3.2 hours to travel 50 km down a river, then 4.6 hours to return. How fast is the river flowing
Two workmen are stacking heavy cinder blocks from the ground to a raised pallet. If one of them stacks 100 of the blocks in 20 min and the other stacks 100 of them in 30 min, which one has done more work? Which has the greater power output?
to heat 1 cup of water 250 cm3 to make coffee you place an electric heating element in the cup. as the water
a lead bullet initially at 33degc just melts upon striking a target. assuming that all of the initial kinetic energy of
A 1.1 kg birdfeeder hangs from a horizontal tree branch. The birdfeeder is attached to the branch at a point that is 1.0 m from the trunk. where the branch attaches to the trunk
A plate of glass by parallel faces having a refractive index of 1.51 is resting on the surface of water in a tank. A ray of light coming from above in air makes an angle of incidence35.5^\circ with the normal to the top surface of the glass.
A star has a mass of 1.8 1030 kg and radiates energy at the rate of4.0 1026 W. What fraction of its original mass has the star lost
Rectangular Loop A rectangular loop (area = 0.15m2) turns in a uniform magnetic field, B =0.17 T. When the angle between the field and the normal to the plane of the loop is π/2 rad andincreasing at 0.70 rad/s, what emf is induced in the loop?
A 25 g bullet fired horizontally hits a 1.45 kg block of wood placed on a horizontal surface.The bullet penetrates into the block and stays in the wood. what was the speed of the bullet
A 90.0- and a 45.0- resistor are connected in parallel. Whenthis combination is connected across a battery, the currentdelivered by the battery is 0.376 A. When the 45.0- resistor is disconnected, the currentfrom the battery drops to 0.131 A.
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