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An asteroid has been discovered revolving around the sun on a circular orbit with radius 4.2 times of the Earth's orbit around the SUN ( about 149.6 million km ). Knowing that it takes the Earth 1 year to complete a revolution, how may years does it take for that asteroid?
suppose a random sample of 49 is selected from a population with a standard deviation of 14. if the sample mean is 125
A 53.0 kg cheerleader uses an oil-filled hydraulic lift to hold four 130 kg football players at a height of 1.30m. what is the diameter of the football players' piston
Suppose that you are traveling on board a spacecraft that is moving with respect to the earth at a speed of 0.970c. compute your breathing rate
Two identical diverging lenses are separated by 23 cm. The focal length of each lens is -14 cm. find the final image distance relative to the lens on the right
Animals in cold climates often depend on two layers of insulation: a layer of body fat surrounded by a layer of air trapped inside fur or down, What is the thickness of the air layer
Ordinary glasses are worn in front of the eye and usually 2.00cm in front of the eyeball. What is their power in diopters
Compute the amplitude and phase at the observation screen
Two objects moving toward each other collide and rebound. Determine the change in kinetic energy of the smaller object
A laser used to weld detached retinas emits light with a wavelength of 652{\rm nm} in pulses that are 20.0{\rm ms} in duration. What is the energy of one photon in electron volts
In an experiment, light of wavelength 600 nm falls on two slits which are spaced at a distance of .5 mm. What is the distance of the slit to the screen
on a windy day, a person on a cart (combined mass m of 70kg) begins at the top of a hill 10m hihg traveling at 3m/s, At what distance from the bottom of the hill did the car stop
A 20.0-kg box rests on a horizontal surface. The coefficient of static and kinetic friction between the box and the surface are 0.30 and 0.10 respectively. obtain the friction force between the box and the surface
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