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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?
Two stars, with masses m1 and m2 that are initially very far apart and at rest (and even farther from any other stars) are pulled together by their gravitational attraction. Determine their relative speed when they are a distance d apart from one ano..
The induced magnetic field at radial distance 6.7 mm from the central axis of a circular parallel-plate capacitor 2.0 x10-8 T. The plates have radius 4.1 mm. At what rate is the magnitude of the electric field among the plates changing?
a positive charge of -4 microcoulombs is llocated at the center of a spherical shell of inner radius 2cm and outer radius 3cm, what is the total charge on he inner shell
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While running, a person dissipates about 0.60 J of mechanical energy per step per kilogram of body mass, how fast is the person running
Imagine a stationary sourceof sound waves. By stationary, we mean that it is not moving with respect to the medium. How fast would you have to move toward the source in order to perceive twice the “actual”frequency? The speed of sound in air is 34..
an unstable particle is created in the upper atmosphere from a cosmic ray and travels straight down toward the surface
Two small plastic spheres are given positive electrical charges. When they are a distance of 14.8cm apart, the repulsive force between them has a magnitude of 0.235 N. What is the charge on the second sphere
A car uniformly decelerates at a rate of -5.00 m/s^2. How far does the car travel after 1.5 seconds if it initially was moving at a speed of 25 m/s
A block of mass m = 8 kg is pushed across a rough table with a force applied at an angle of 40 with respect to the horizontal direction, what is the work done by friction
A small solid ball is released from rest while fully submerged in a liquid and then its kinetic energy is measured when it has moved 5 cm in the liquid. What is the density of the ball
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