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A football coach in hopes of improving his kicker's performance fills a football with helium rather than air. Assuming that the football contains a volume of helium equal to the air it replaces at standard temperature and pressure, what change in relative weight of the football (change in weight divided by weight) is to be expected? The volume of the football is 1.6 l.
explain the separation between the two sources. What is the displacement of the car between 3 P.M. and 6 P.M.
he car is suspended beneath the helicopter by a steel cable. Illustrate what is the lift force exerted on the air by the helicopter's rotor?
The near point of a naked eye is 25 cm. When placed at the near point and viewed by the naked eye, a tiny object would have an angular size of 5.2 10-5 rad. Find the focal length of the eyepiece in cm
A 33.4 cm focal-length converging lens is 24.8 cm behind a diverging lens. Parallel light strikes the diverging lens. What is the focal length of the diverging lens
A piece of Nichrome wire has a radius of 6.2 x 10-4 m. It is used in a laboratory to make a heater that dissipates 4.40×102 W of power when connected to a voltage source of 130 V. estimate the necessary length of wire
A racing dog is initially running at 18.0 , but is slowing down. By what fraction has its kinetic energy been reduced
A Carnot heat engine takes 89 cycles to lift a 15 kg mass a height of 15 m. What is the temperature of the hot reservoir in Celsius
The diffusion constant for the alcohol ethanol in water is 1.24 10-9 m2/s. A cylinder has a cross-sectional area of 3.85 cm2 and a length of 1.82 cm. what mass of ethanol diffuses through the cylinder
The bonds pays interest semiannually on June 30 and December 31. The bonds are issued to yield 5%. Illustrate what are the proceeds from the bond issue?
Light of 550nm is incident on two slits. A maximum is seen at an angle of 4.10 degrees and a minimum at 4.78 degrees. What is the distance between the slits
A fishing line is attached to a bober that has diameter of 5.00 cm and mass of 5.00g. A lead weight is attached to line. What is mass of lead
A bat strikes a 0.145-kg baseball. Just before impact, the ball is traveling horizontally to the right at 50.0m/s, and it leaves the bat traveling to the left at an angle of 30 degrees above horizontal with a speed of 65 m/s. If the ball and bat a..
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