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Bob and Ray push on a door from opposite sides. They both push perpendicular to the door. Bob pushes 0.63 m from the door hinge with a force of 89 N. Ray pushes 0.57 m from the door hinge with a force of 98 N, in a manner that tends to turn the door in a clockwise direction. What is the net torque on the door?
A CD originally at rest reaches an angular speed of 39 rad/s in 4.8 s. What is the magnitude of its angular acceleration
A power station delivers 520 kW of power at 12,000 V to a factory through wires with total resistance 3.0. How much less power is wasted if the electricity is delivered
Measurements of the radioactivity of a certain isotope tell you that the decay rate decreases from 8305decays per minute to 3080 decays per minute over a period of 5.00 days
Body A in the figure weighs 122 N, and body B weighs 33.5 N. The coefficients of friction between A and the incline are, What is the acceleration of A if A is initially at rest
Green light (? = 546 nm) strikes a single slit at normal incidence. What width slit will produce a central maximum
A cylinder contains 2 moles of an ideal monatomic gas that is initially at state A with a volume of 0.01 m^3 and a pressure of 4.0x10^5 Pa. Is this device a refrigerator or a heat engine
You are in a hot-air balloon that, relative to the ground, has a velocity of 4.65 m/s in a direction due east. find direction of the hawk's velocity relative to the ground
Two large metal plates of area 0.5 m2 face each other. They are 4.8 cm apart and have equal but opposite charges on their inner surfaces. what is the magnitude of the charge on each plate
A block slides down an inclined plane, starting from rest and being pushed with a constant acceleration of 4.95 m/s2 over a distance of 21.6 cm. Find the total time the block is in motion
Racing drivers like to warm up the tyres of their car as soon as possible. One reason is that warm tyres grip the road better but the temperature also affects the pressure of the air into he tyres.
A sound wave generated by a source of frequency 440 Hz is moving through 25 oC air. What is the wavelength of the sound wave inside the steel
The temperature of 1.3mol of an ideal diatomic gas goes from 20?C to 57?C at a constant volume. What is the change in entropy
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