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A diver of mass 70kg jumps off a board 10m above the water. If his downward motion is stopped 2 secs after he enters the water, what average upward force did the water exert on him?
Three athletes are tugging on a ring. Martha pulls with a force of 150 N in the northerly direction. Eveylyn pulls with a force of 100 N in the easterly direction. Sara pulls with a force of 200 N in the southwesterly direction (225 degrees clockw..
A 52.0 skateboarder wants to just make it to the upper edge of a "quarter pipe," a track that is one-quarter of a circle with a radius of 2.90. What speed does he need at the bottom.
To focus a camera on objects at different distances, the converging lens is moved toward or away from the film, Over what distance must the lens be movable
A 395 turn circular loop coil 16 cm in diameter is initially aligned so that the axis is perpendicular to the earth's magnetic field. What is the magnitude of the earth's magnetic filed at this location
A diver shines a flashlight upward from beneath the water at a 44.5° angle to the vertical. At what angle does the light leave the water
Two identical spaceships are traveling in the same direction. An observer on Earth measures the first to have speed 0.80c, What is the speed of the second spaceship
How long does it take for the grinding wheel to stop ? Through how many radians has the wheel turned during the interval found in.
A proton moves through a magnetic field at 31.1% of the speed of light. compute magnitude of the magnetic force acting on the proton
A radio station broadcasts at a rate of 89.3 million cyces each second. what is the period of this wave and if the wavelength is 3.359 meters, what is the speed of this radio wave
The magnetic force on a straight 0.31 m segment of wire carrying a current of 4.5 A is 1.5 N. What is the magnitude of the component of the magnetic field that is perpendicular to the wire? Answer in units of T.
A satellite is in a circular orbit around an unknown planet. The satellite has a speed of 1.65 104 m/s, What is the orbital speed of the second satellite
The temperatures indoors and outdoors are 297 and 311 K, respectively. A Carnot air conditioner deposits 6.22 105 J of heat outdoors. How much heat is removed from the house?
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