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Liquid helium has a temperature of only 4.24 K and is in equilibrium with its vapor at atmospheric pressure. Calculate the rms speed of a helium atom in the vapor at this temperature.
A 4 kg box is raised from rest adistance of 6 m by a vertical force of110 N. Find the final kinetic energy of the box
A spherical source radiates sound uniformly in all directions. At a distance of 13 m, the sound intensity level is 80 dB. What power is radiated by this source
a particle with positive charge q = 6.40 x 10-19 C moving with speed v = 8.13 x 105 m/s toward a long straight wire with current i = 229 mA, What is the magnitude of the force on the particle due to the current
A Cepheid variable has been found to have a period of 22 days, from this its luminosity is determined to be 2.8 x 1029 W, calculate the distance to the Cepheid
At age 40, a man requires contact lenses (f=65.0 cm) to read abook held 25.0 cm from his eyes. By what distance has his near point changed
A 14kg projectile is launched at 380m/s at a 55 (degrees) angle to the horizontal. At the peak of its trajectory it collides with a second projectile moving horizontally, in the opposite direction, at 140m/s . The two stick together and land 9.8km ho..
at a steady laminar flow through a tube of radius of 1cm the volume flow rate is 30 liters of water during 1 minute.
A 5cm object is 30 cm in front of the converging lens with a focal length of 15 cm. calculate the image height
An engraver uses a magnifying glass (f = 8.80 cm) to examine some work, as in the drawing. What is the distance between the work and the magnifying glass
What mass of water at 30.0°C must be allowed to come to thermal equilibrium with a 2.15-kg cube of aluminum initially at 1.50 × 102°C to lower the temperature of the aluminum to 77.0°C? compute the mass of the aluminum cup
A sphere of radius 0.500 m, temperature 25.5°C, and emissivity 0.873 is isolated in an environment of temperature 77.0°C. What is the sphere's net rate of energy exchange
A water pistol aimed horizontally projects a stream of water withan initial speed of 5.75 m/s. How far does the water drop in moving1.75 m horizontally?
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