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A float plane lands on a river. Assume the velocity of the airplane relative to the air is 25 m/s, due east; the velocity of the wind is 20 m/s, due north; and the current in the river is 7 m/s, due south. Calculate the velocity of the plane just before it lands relative to the water.
If you twirl a small 7.0-g wooden ball in a circle at 4.0 revolutions per second on a light 10-cm string, approximately how many units of angular momentum does it have
A 7.00×10-1 H coil with a resistance of 1.62×101 Ohm is in series with a 3.01×102 Ohm resistor. find the rms value of the potential difference across the resistor
two identical conducting small spheres are placed with their centers 0.395 m apart. one is given a charge of -12.0 nc
A rock is thrown off a bridge of height 75m. at an angle theta=25 degrees with respect to the horizontal. The initial speed of the rock is 15 m/s. compute the maximum height reached by the rock?
A 1300kg sports car accelerates from 0m/s to 33m/s in 12s . What is the average power of the engine?
A golfball rolls off a horizontal cliff with an initialspeed of 11.4 m/s. The ball falls a vertical distance of 15.5m intoa lake below. How much time does the ball spend in the air
The mass of the sled and its two riders in the figure below is 300 kg. find the magnitude of the centripetal force that acts on the sled
Compact fluorescent bulbs are much more efficient at producing light than are ordinary incandescent bulbs. They initially cost much more, but last far longer and use much less electricity.
What is the velocity of the AB pair after A collides with B? How much did the temperature of the 100 kg steel coupler (originally 293 K) change as a result of the collision? The specific heat of steel is 0.466 J/kg.k
A milliammeter reads 15mA full scale. It consists of a 0.20 Ohm resistor in parallel with a 36 Ohm galvanometer
The work function for Tin is 4.42 eV. Ultraviolet light with \lambda =50 nm is shone upon a Tin electrode
Consider a free electron gas model for noninteracting electrons ina two-dimentional infinite square well. Calculate the Fermi energyEf of the system. Let σ be the number of freeelectrons per unit area(i.e ,σ =Nq/A, where A is the area ofsquare wel..
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