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A cryogenic storage container holds liquid helium, which boils at 4.2 K. Suppose a student painted the outer shell of the container black, turning it into a pseudo-blackbody, and that the shell has an effective area of 0.40 m2 and is at 3.3 102 K. (a) Determine the rate of heat loss due to radiation. (The Stefan-Boltzmann constant is ? = 5.67 10-8 W/(m2 K4).) (b) What is the rate at which the volume of the liquid helium in the container decreases as a result of boiling off? The latent heat of vaporization of liquid helium is 20.9 kJ/kg. The density of liquid helium is 0.125 kg/L.
An object is shot at 56 m/s horizontally off the roof of a building which is 55 meters above the ground. How long does it take the object to reach the ground in seconds
A 6.0-cm-diameter circle lies in the xz-plane in a region where the electric field is E =(1200i^+1200j^+1200k^)N/C
A car with a mass of 1234 kg is travelling around a circular track with a radius of 100.m and a tangential velocity of 23 m/s. Determine the centripetal acceleration of the car
How much time passes by they collide
You have 2 capacitors plus 1 resistor all hooked up in series. The value of R= 15 ohms and C1=C2= 1uf. Find the time constant T(tau)=RC
A soccer ball of mass 1.5 kg and radius 15 cm rolls down a 35degree incline that is 6.0 m high, How fast is the ball moving forward when it reaches the bottom of the incline
The star Sirius is a distance of 8 light years from the earth. If Sirius suddenly stopped shining, how much longer would it be seen on earth
In a diagnostic procedure a patient in a hospital ingest 80 mCi of gold-198 ( half life time is 2.7 days) what is the activity of the gold source in the end of a month ( after 30 days)
A proton (mass 1.67 x 10^27kg) is moving at 1.55 x 10^6m/s directly toward a stationary helium nucleus (mass 6.64 x 10^27kg). what is the helium's velocity
An apartment has a living room whose dimensions are 2.8 m x 5.1 m x 5.6 m. what is the mass (in grams) of the air
A carpenter is driving a nail into a board. The 1.25 kg hammer moves at 8.85 m/s when it strikes the nail. find the increase in temperature of the nail after 3 blows from the hammer
A mass m = 90 kg slides on a frictionless track that has a drop, followed by a loop-the-loop with radius R = 18.8 m and finally the flat straight section at the same height as the center of the loop (18.8 m off the ground). Because the mass would not..
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