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Use the mass density of radiation in the preceding problem to determine the mass density of radiation when T = 2.725 K. How does this compare with the average density of matter in the universe? Does this mean we are in a radiation-dominated or matter- dominated universe?
A 150 g ball on a 60-{\rm cm}-long string is swung in a vertical circle about a point 200 {\rm cm} above the floor. The tension in the string when the ball is at the very bottom of the circle is 4.0 N.
Saturn has an equatorial radius of 6.00 * 10 ^7 m and a massof 5.67 * 10 ^26 kg. Compute the acceleration of gravity at the equator of Saturn
Two parallel plates, each having area A = 3788.0cm2 are connected to the terminals of a battery of voltage Vb = 6.0 V as shown. What is C the capacitance of this parallel plate capacitor
A 1140nF capacitor with circular parallel plates 1.12cm in diameter is accumulating charge at the rate of 20.7mC/s at some instant in time. What will be the induced magnetic field strength 10.8cm radially outward from the center of the plates? Wh..
A 15.0 g bullet is fired at a muzzle velocity of 3250 m/s from a high powered rifle with a mass of 4.75 kg and barrel of lenght 75.0 cm. How long is the bullet in the barrel
An electron and a proton, starting from rest, are accelerated through an electric potential difference of the same magnitude. In the process, Find the ratio ve/vp
A man uses a tire iron to loosen his lug nuts. The tire iron is 25cm long. The man applies a force of 30N at an angle of 29° to the iron. What is the torque that is applied to the lug nut
A 1600 kW heat engineoperates at 21% efficiency. The heat energy expelled at thelow temperature is absorbed by a stream of water that enters thecooling coils at 20°C. determine the increase in temperature of the water
A 10-kg object on a frictionless table is subjected to two horizontal forces, F1→ and F2→ with magnitude F1 = 20 N and F2 = 30 N, as shown in Figure 4-40. Find the third horizontal force F3→ that must be applied so that the object is in static equili..
The lifetime of the original nucleus is 1.0E-21 s. Because we are not sure when during this lifetime this reaction will occur (i.e., decay), the uncertainty of the time is equal to the lifetime. What range of values of the neutron kinetic energy m..
Is there a trivial objection to proposing that interference fringes would build up with multiple particles, just as in any double slit experiment, indicating that QM waves, whatever those are as well, are immune to event horizons? Clearly only tha..
A beaker of mass 1.5kg containing 3.2kg of water rests on a scale. A 3.2kg block of a metallic alloy of density 53400 kg/m is suspended from a spring scale is submerged in water of density 1000 kg/m.
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