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When traveling past an observer with a relative speed v, a rocket is measured to be 9.10 meter long. When the rocket moves with a relative speed 2v, its length is measured to be 4.90 meter. Determine the speed v? Compute the proper length of the rocket?
An electric motor rotating a workshop grinding wheel at a rate of 107 rev/min is switched off. Assume the wheel has the constant negative angular acceleration of magnitude 1.70 rad/s2.
the starter motor of a car engine draws a current of 110a from the battery. the copper wire to the motor is 4.40mm in
A transformer on a utility pole operates at an Vp = 8:5 KV rms on the primary side and supplies electric power to a number of nearby houses at Vs = 120 V rms. What is the turn ratio, Np=Ns, of this step-down transformer
a 3.000 u 1 u 931.5 mevc2 object moving to the right through a laboratory at 0.8c collides with a 4.000 u object
Centripetal Force as a function of radius (with constant speed and mass). What kind of function fits this data best? Is it linear, quadratic, exponential, or reciprocal relationship? Or is it something else?
A girl swings back and forth on a swing with ropes that are 4.00m long. The maximum height she reaches is 1.50m above the ground, What is the girl's maximum speed
Find the net rate of radiation by a pot at 45.1°C that has been placed in a -24.1°C freezer. The pot\'s surface area is 0.117 m2 and its emissivity is 0.635
The three-toed sloth is the slowest moving land mammal. On the ground, the sloth moves at an average speed of 0.035 m/s, how much further would the tortoise have gone relative to the sloth
A railroad freight car weighing 289 kN and traveling at 1.52 m/s overtakes one weighing 207 kN and traveling at 0.910 m/s in the same direction. Find the loss of kinetic energy during collision
A 10000 kg train car A traveling at a speed of 24 m/s strikes an identical car B initially at rest. calculate the amount of the initial kinetic energy is transformed into thermal or other forms of energy
One of the instruments on the probe has a spring (with a weight of 1.0 kg at one end) that measures the intensity of the gravitational force of the asteroid. What would be its maximum "bobbing" velocity if it were on Earth
When the lights of an automobile are switched on, an ammeter in series with them reads 10.20 A and a voltmeter connected across them reads 12.10 V. What is the current through the starting motor
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