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A boat heads directly across a river. Its speed relative to the water is 3 m/s. It takes it 539 seconds to cross, but it ends up 662 m downstream. How fast is the boat going relative to the bank of the river?
At the local swimming hole, a favorite trick is to run horizontally off a cliff that is 6.35 m above the water. find the number of revolutions she makes while on the way down
A laser with wavelength d/8 is shining light on a double slit with slit separation 0.400mm. What is the wavelength %u03BB2 of the second laser
An elevator with a mass 2000kg rises with an acceleration of 1m/s^2. What is the tension in the supporting cables
Josh starts his sled at the top of a 2.3m -high hill that has a constant slope of 25 ?. How far from the hill does he end up
A block of mass, m1 is 5 kg. It is lying on a frictional horizontal surface. Evaluate the magnitude of the net force on the hanging block
A 30.0g ball rolls around the 40.0cm diameter hemishperical track at 60.0rpm. Assume rolling friction is negligible. Determine the ball's linear velocity
On a workday the average decibel level of a busy street is 84 dB, with 100 cars passing a given point every minute. what is the decibel level of the street
If you are cruising down the road at 50 mph and a policeman with a radar gun (wavelength 1 cm) reflects radar light off your bumper, what wavelength of radar light does he get back
A coil of inductance 70 mH and unknown resistance and a 0.85 µF capacitor are connected in series with an alternating emf of frequency 980 Hz. what is the resistance of the coil
A tungsten target is struck by electrons that have been accelerated from rest through a 20.0-kV potential difference
You are designing a small coil (called a search coil) to measure magnetic fields. It is to have a diameter of 3.80 cm, How many turns should the coil have
A very light rigid rod with a length of 0.500 m extends straight out from one end of a meter stick. The stick is suspended from a pivot at the far end of the rod and is set into oscillation.
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