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Every 5 seconds between a lightning flash and the following thunder gives the distance to the flash in miles. Assuming the flash arrives quickly, estimate the speed of sound in m/s from this rule. What would be the rule for kilometers?
A series RLC ac circuit has a capacitive reactance of 55 ?, and inductive reactance of 25 ?, and a resistance of 40 ?. What is the phase angle of this circuit
Two automobiles are equipped with the same single-frequency horn. When one is at rest and the other is moving toward the first at 20 m/s, What does the frequency the horns emit
Superman throws a boulder of weight 2400N at an adversary. What horizontal force must Superman apply to the boulder to give it a horizontal acceleration of 14.4m/s^2 ?
A 12.00 box resting on a horizontal, frictionless surface is attached to a 5 weight by a thin, light wire that passes without slippage over a frictionless pulley. The pulley has the shape of a uniform solid disk of mass 2.5 and diameter 0.560.
or a given initial projectile speed, For what other launch angle will the projectile have the same range
An airplane is flying due north at 180 m/s. The Earth's magnetic field has a northward component of 0.3 mT and an upward component of 0.34 mT. Which wingtip is positively charged
A segment of wire carries a current of 20 A along the x-axis from y=2.0 m to y=0 and then along the x axis from x=0 to x=-4.0 m. What is the magnitude of the force on this segment of wire
If the gas pressure and volume both double, what's the change in internal energy, find the internal energy of 1mol of oxygen at 291K and 1.0 atm
In the future, an astronaut weighing 882 Newtons on earth may stand on a new moon and weigh themselves to find they now weigh 441 Newtons. what is the mass of this new moon
A golf ball of mass 0.045 kg is hit off the tee at a speed of 33m/s. Find the average force exerted on the ball by the golf club
A wooden block with equal sides of 4 cm is floating in water. If the density of the block is half the density of water, how far is it from the water to the top of the block?
The angular speed of an automobile engine is increased from 1540.0 rev/min to 1865.0 rev/min in 17.0 s. How many revolutions does the engine make during this time
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