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As morning sunlight falls on a tethered helium balloon, it expands from a volume of 1.05 ×103 m3 to 1.15 ×103 m3. How much work does the helium do on its environment (assuming the gas bag remains slack)? If the initial temperature of the helium is 270K, how many moles of gas are in the balloon? how much does the helium's internal energy increase? how many joules of solar energy are absorbed?
on one particular shot, his 1.00 g pellet gets stuck in the cheese, causing it to slide 25 cm before coming to a stop. If the muzzle velocity of the gun is 64m/s and cheese has a mass of 98 g, what is the coefficient of friction between the cheese..
A certain red giant star has a luminosity of 100,000 times that of the Sun and is located 600 light-years from Earth. calculate the rate of interstellar extinction in the direction of the star
A 69.20-kg free runner jumps off a wall at a velocity of 6.95 m/s at an altitude of 2.37 m above the ground. What is the free runner's kinetic energy when he jumps off the wall
The mass of a robot is 4340 kg. This robot weighs 3000 N more on planet A than it does on planet B. Both planets have the same radius of 2.37 × 107 m
For alpha particles of energy 7.68 MeV scattered from a platinum foil two microns thick, find the collision diameter
An exoplanet of mass 7.4e26 kg orbits its parent star at an angle of inclination of 28.9 degrees. determine the period of the exoplanet in days
A loudspeaker on a tall pole broadcasts sound waves equally in all directions. If the sound output is 7.0 W, at what distance from loudspeaker is the sound intensity level 85.7 dB.
An unknown material has a normal melting/freezing point of -26.3° C, and the liquid phase has a specific heat capacity of 160 J/(kg · C°). What is the latent heat of fusion of the unknown material
A photoflash unit makes a very bright light for a very short time. Discuss differences in the exposure of the film with and without a flash unit. Consider the f-stop and shutter speed in your deliberation.
Find out an acceleration of mass and tension in the string
A sled weighing 1.0 X 10^2 N is held in place on a frictionless 20.0 degree slope by a rope attached to a stake at the top. The rope is parallel to the slope. What is the normal force of the slope acting on the sled.
If the electric field strength in air exceeds 3.0 ? 106 N/C, the air becomes a conductor, determine the maximum amount of charge that can be carried by a metal sphere4.9 m in radius
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