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A small 523 g model rocket lifts off the ground, accelerating quickly. 4.2 s later the engine cuts out at a height of 845 m, at which time the rocket is traveling at 152 m/s. What power was demonstrated by the engine?
An old-fashioned (vinyl) record rotates at a constant rate of 33 rpm. If the record has a radius of 18 centimeter, determine what is the linear speed of a point on its edge
When monochromatic light shines perpendicularly on a soap film(n = 1.33) with air on each side, Determine the vacuum wavelength of the light
A cylindrical copper rod has resistance of 0.3 ohm. It is reformed to 3.8 timesm its original length with no change of volume. What is its new resistance in ohms?
A soccer player kicks a ball from ground level with an initial velocity of 25 m/s at an angle of 30° above the horizontal. What angle does the velocity vector make with the horizontal
An aluminum rod is clamped one quarter of the way along its length and set into longitudinal vibration by a variable-frequency driving source. The lowest frequency that produces resonance is 4300 Hz. The speed of sound in an aluminum rod is 5100 m..
If a 4 cm piece of insulation is added to the pine ceiling kpine = 0.120 J/msC kinsul = 0.042 J/msC If a 4 cm piece of insulation is added to the pine ceiling , find the interface temperature for the pine and insulation.
Radio receivers can comfortably pick up a broadcasting station’s signal when the electric field strength of the signal is about 10.0 mV/m. If a radio station broadcasts in all directions with an average power of 42.0kW , what would be the maximum ..
A wall is formed of two identical panels that enclose air space. The thickness of the panels is lp = 0.02 m and that of the air space is la = 0.04 m.
A transformer with a turns ratio (secondary:primary) of 1:81 is used to step down the voltage from a 120-V wall socket to be used in a battery recharging unit. What is the voltage supplied to the recharger? V
An aircraft starts at rest and is accelerated at 7.8 m/s2 for 9 seconds, at which time the aircraft launches. What is the distance traveled from the starting point to the launch point? Assume the acceleration is constant.
My professor today stated that if a ball was to fall a certain height, then the work done by gravity on the ball would equal the work done by the ball's equal and opposite gravitational pull. By W=F*d, this means that the earth must travel the ..
A rock climber stands on top of a 51 m high cliffoverhanging a pool of water. He throws two stones verticallydownward 1.0 s apart and observes that they cause a singlesplash. The initial speed of the first stone was2.4 m/s.
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