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A 626 kilogram elevator starts from rest and moves upward for 2.50 second with constant acceleration until it reaches its cruising speed, 1.71 m/s.
(a) Find the average power of the elevator motor during this period?
(b) Find the average power during an upward cruise with constant speed?
The electric potential at the surface of a conducting,spherical shell of radius R is V > 0 relative to Earth ground.True or False? The magnitude of the electric potential at a distancer=2R from the center of the shell is V/2.
A round pipe of varying diameter carries petroleum from a wellhead to a refinery. At the wellhead the pipe\'s diameter is 58.3 cm and the flow speed of the petroleum is 11.1 m/s. At the refinery the petroleum flows at 5.35 m/s. What is the volume flo..
A laser pulse has an energy of 15 J and a beam radius of 2 mm. The pulse duration is 11 ns and the energy density is constant within the pulse. What is the spatial length of the pulse
An ac generator with a frequency of 1.44kHz and an rms voltage of 24.2V is connected in series with a 2.10 kilo-ohm resistor, What is the average power consumed by this circuit
A steel ball with a mass of 32.0g is dropped from a height of 2.10m onto a horizontal steel slab. The ball rebounds to a height of 1.50m. find the average force on the ball during the impact
a very long coaxial cable consists of a solid cylindrical inner conductor of radius 4mm surrounded by an outer
It is determined by immersing a crown in waterthat is volume is 39 in3 =0.00225 ft3. what would its weight be if it were made of pure gold
Find the magnitude and direction of the acceleration. A 2.60 kg steel ball strikes a wall with a speed of 10.0 m/s at an angle of 60.0° with the surface. It bounces off with the same speed and angle. If the ball is in contact with the wall for 0.19..
A base on Planet X fires a missile toward an oncoming space fighter. The missile's speed according to the base is 0.81 c. How fast is the space fighter traveling relative to Planet X
An automobile crankshaft transfers energy from the engine to the axle at the rate of 110 kW when rotating at a speed of 2170 rev/min. What torque does the crankshaft deliver
A spring is compressed by 0.0674 m and is used to launch an object horizontally with a speed of 2.62 m/s. at what angular frequency (in rad/s) would it oscillate
three equal point charges each with charge 1.80 muc are placed at the vertices of an equilateral triangle whose sides
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