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A person travels in a car with a speed of 90 m/s. To get the driver's attention, a stationary police officer behind the car shines his spotlight at the car. If the officer is 270 m behind the car when he turns on his spotlight, how long does it take for the light to reach the car? An astronaut travels at a speed of 0.98c from the Earth to a distant star that is 6.2 1017 m away. If the astronaut is 33 years old when she begins her trip, how old is she when she arrives at the star?
the mean distance between the center and the center of the moon is 3.84x108 m and the moon has an orbital period of
In very cold weather, a significant mechanism for heat loss by the human body is energy expended in warming the air taken into the lungs with each breath. How much heat is lost per hour if the respiration rate is 19.0 breaths per minute
question the resonant frequency of a certain series rlc circuit is 3.88 khz and the value of its capacitance is 7.00
A cube of wood have and edge dimension of 20.0cm and a density of 650 kg/m^3 floats on water. what mass of lead should be place on the cube
A particular wire has a diameter of 1.7 mm and length of 1.3 m. If its resistance is 15 m?, what is the resistivity of the metal from which it is made
a 35 kg uniform ladder is leaned against a building. the 5 m tall ladder makes an angle of 60 degrees with the
Two electrical charges, (q1 = 2.25 μC and q2 = –6.75μC) are located along the x-axis. q1 is located at the origin; q2 is located at x = 1.25 cm. Where, if anywhere, along the x-axis could you place a third chargeso that it would not accelerate as a..
Cliff and Will are carrying a uniform 2.0m board of mass 74kg. Will is supporting the board at the end while cliff is 0.6m from the other end, Find the normal forces exerted by Cliff and Will
A proton is confined within an atomic nucleus of diameter 3.5 fm. Estimate the smallest range of speeds you might find for a proton in the nucleus
A 330-g air track cart on a horizontal air track is attached to a string that goes over a pulley with a moment of inertia of 5.00 x 10-6 kg?m2 and a radius of 1.35 cm. Write Newton's second law equation for each of the three objects
A 1026 kg car and a 2210 kg pickup truck approach a curve on the expressway that has a raduis of 264 m. find the normal force on the truck to the highway surface
A blackened, solid copper sphere that has a radius equal to 2.5 cm hangs in an evacuated enclosure whose walls have a temperature of 29°C. find the initial rate at which its temperature changes
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