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A 10.0 kg crate is pulled up a rough incline with an initialspeed of 1.5 m/s. The pulling force is 100.0 N parallel to theincline, which makes an angle of 15 degrees with the horizontal.Assuming the coefficient of kinetic friction is 0.40 and the crateis pulled a distance of 7.5 m, find the following:
a. the work done by the Earth's gravity on the crate
b. the work done by the force of friction on the crate
c. the work done by the puller on the crate
d. the change in kinetic energy of the crate
e. the speed of the crate after it is pulled 7.5 m.
At the tropics, the water close to the surface of the oceanis hotter than the deep water. Would the Second Law ofther modynamics be violated if a machine is been put to operate between these two water levels? Explain.
an object weighing 310 n in air is immersed in water after being tied to a string connected to a balance. the scale now
A playground carousel is free to rotate about its center onfrictionless bearings. The carousel has an angular speed of3.14 rad/s, Find the resulting angular speed of the carousel and person
A cylindrical conducting shell of radius ρ=4mm and negligible thickness forms the inner conductor of coaxial line, What is the magnitude of the force (per unit length) acting to split the outer cylinder apart longitudinally
a metal rod is forced to move with constant velocity along two parallel metal rails, connected with a strip of metal at one end. what is the current in amperes in the rod
Two long parallel wires carry currents of 2.83 A and 5.41 A. Find the separation distance of the wires expressed in millimeters
A worker pushed a 65.0-kg block 10.0 m along a level floor at a constant speed with a force directed 39.0° below the horizontal. how much work did the worker do on the block
Two point charges, Q = +5.17 microC and q = -2.83 microC, are separated by r = 5.85 m. What is the electric potential energy?
An electron with speed v0 = 2.26×107m/s is traveling parallel to an electric field of magnitude E = 2.36×104N/C. How far will the electron travel before it stops
a pulley with a rotational inertia of 1.1 multiplied by 10-3 kgmiddotm2 about its axle and a radius of 11 cm is acted
A Roman centurion fires off a vat of burning pitch from hiscatapult at 18.2m/s, 37 degrees above the horizontal. how long was the vat in the air
A circular coil (980 turns, radius = 0.043 m) is rotating in auniform magnetic field. At t = 0 s, the normal to the coilis perpendicular to the magnetic field. At t = 0.013 s,the normal makes an angle of 45o with the field becausethe coil has made ..
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