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An 80 kg man stands in an elevator. What force does the floor of the elevator exert on the man if a) the elevator is stationary? b) the elevator accelerates upward at 2 m/s2? c) the elevator rises with constant velocity 4 m/s? d) while rising, the elevator decelerates at 1.5 m/s2? e) the elevator descends with constant velocity 7 m/s?
The Hall effect can be used to determine the density of mobile electrons in a conductor. Find the density of mobile electrons in the material
The wingspan (tip-to-tip) of a Boeing 747 jetliner is 59 m. The plane is flying horizontally at a speed of 220 m/s. Find the emf induced between the wing tips
a 25-N block slides down a plane inclined at 21.2 degrees to the horizontal with constant velocity. find the total force resisting the motion of the block
The rotor (flywheel) of a toy gyroscope has mass 0.140 kg. Its moment of inertia about its axis is The mass of the frame is 0.0250 kg. Find the upward force exerted by the pivot
A concentration difference of a certain solute of 1.0 Ã- 10â€"2 kg/m3 is maintained between the ends of a tube with a length of 3.5 m and a cross-sectional area of 0.25 m2. What is the diffusion constant for the solute
350J of energy are transferred to a system in the form of heat while the thermal energy increases by 160J
Starting from rest, a 4.10-kg block slides 2.6 m down a rough 30.0° incline. The coefficient of kinetic friction between the block and the incline is ?k = 0.436, Determine the work done by normal force
what is the magnitude of the force between the two charges. The scale of vertical axis is set by vs = 5.10 m/s. What is the coefficient of kinetic friction between block and floor.
A balloon is released from a tall building. The total mass of the balloon including the enclosed gas is 1.5kg. Its volume is 2.5m^3. What is the average density of the balloon with gas
Copper has an electrical resistivity %u03C1 = 1.72 x 10-8 %u2126m. What is the electrical resistance of a copper wire
The flash of a digital camera totally consumes the energy of an arrray of identical 7 F capicitors when a picture is taken, How many capicitors are in the array
Unpolarized light with an intensity of 660 W / m2 is incident on a polarizer with an unknown axis. What is the angle between the axes of the polarizers
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