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A(n) 716 kg elevator starts from rest. It moves upward for 4.36 s with a constant acceleration until it reaches its cruising speed of 2.14 m/s. The acceleration of gravity is 9.8 m/s^2. Find the average power delivered by the elevator motor during this period. Answer in units of kW.
define the hazards for astronauts inside any spacecraft moving in the vicinity of a pulsar.
A 55 kg student traveling in a car with a constant velocity has a kinetic energy of 1.1 104 J. What is the speedometer reading of the car in km/h
Suppose the moon were held in its orbit not by gravity but by the tension in a massless cable. What is the speed of the moon in its orbit about the earth
Two nanowires are separated by 1.6 nm as measured by STM. Inside the wires the potential energy is zero, but between the wires the potential energy is greater than the electron's energy by only 1.4 eV.
Some nucleus of 74X189 (atomic mass = 188.96191 u) undergoes - decay to become 75X189 (atomic mass = 188.95922 u). What is the energy (in MeV) released in this process
A hand-pumped water gun is held level at a height of 0.82 m above the ground and fired. Find the gauge pressure of the water gun's reservoir at the instant when the gun is fired
What is the required average power.
At time a grinding wheel has an angular velocity of 22. It has a constant angular acceleration of 28.0 until a circuit breaker trips at time = 1.60 . From then on, the wheel turns by an angle of 438 as it coasts to a stop at constant angular decel..
A diffraction grating produces a first order maximum at an angle of 20.0°. What is the angle of the second order maximum
Now consider this applet, where the two blocks have different masses. Plug the starting values into your formula from Part G, using 5 for mass of the red block and 10 for the magnitude of the acceleration of gravity.
The desperate contestants on a TV survival show are very hungry. The only food they can see is some fruit hanging on a branch high in a tree. With what speed does the rock leave the spring
A 10 g bullet traveling at 440m/s strikes a 7.0kg , 1.2-m-wide door at the edge opposite the hinge. What is the angular velocity of the door just after impact
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