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Liquid helium is stored at its boiling point temperature of 4.2K in a spherical container (r=0.30 meter). The container is a perfect blackbody radiator. The container is surrounded by a spherical shield whose temperature is 87 K. A vacuum exists in the space between the shield and the container. The latent heat of vaporization for helium is 2.1x104 J/kg. Calculate what mass of liquid helium boils away through a venting valve in 1 hour?
A small statue has a height of 3.2 cm and is placed in front of a concave mirror. Find the focal length of the mirror
question1a relaxed biceps muscle requires a force of 25.0n for an elongation of 3.0 cm below maximum tension the same
An air-filled parallel-plate capacitor has plates of area 2.20 cm2 separated by 2.00 mm. What is the charge on the capacitor
A car speeds along the curved exit ramp of a freeway. The radius ofthe curve is 86 m. A 68 kg passenger holds the arm rest of a car door witha 220 N force to keep from sliding across the front seat of thecar.
A baseball thrown at a angle of 40.0 degrees above the horizontal at 15.0 m/s from the top of a vertical cliff strikes the ground 42.5 m from the base of the cliff. Ignore air resistance. Find the height of the cliff.
A 1.50e-14 kg oil drop accelerates downwards at a rate of 1.80 m/s^2 when placed between two horizontal plates that are 9.40 cm apart. Determine the magnitude of the charge on the oil drop
A small block of mass 20.0 grams is moving to the right on a horizontal frictionless surface with a speed of 0.68 m/s. What is the speed of the 40.0 gram block after the collision
the man and the platform together weigh 1200 N. The pulley can be modeled as frictionless. Elucidate how hard the man has to pull on the rope to lift himself steadily upward above the ground.
A plane accelerates from rest at a constant rate of 5.00 along a runway that is 1800 long. What is the time needed to take off
A person eats a dessert that contains 280 Calories. (This "Calorie" unit, with a capital C, is the one used by nutritionists; 1 Calorie = 4186 J.
A Carnot engine absorbs 950J of heat each cycle and provides 340J of work. How much heat is rejected each cycle
A daredevil decides to jump an canyon. Itswalls are equally high and 10 m apart. What minimum speed must he have in order to clear the canyon
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