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To get an idea of how empty deep space is on the average, perform the following calculations.
(a) Find the volume our sun would occupy if it had an average density equal to the critical density of 10-26 kg/m3thought necessary to halt the expansion of the universe.
_____ m3
(b) Find the radius of a sphere of this volume in light years.
_____ ly
(c) What would this radius be if the density were that of luminous matter, which is approximately 5% that of the critical density?
_____ly
(d) Compare the radius found in part (c) with the 4 ly average separation of stars in the arms of the Milky Way.
solenoid is formed by winding 23.0 m of insulated silver (resistivity 1.59 x 10-8 Ω·m) wire around a hollow cylinder. The turns are wound as closely as possible without overlapping, and insulating coat on the wire is negligibly thin.
A thermos contains 130 cm3 of coffee at 85° C. To cool the coffee, you drop two 13-g ice cubes into the thermos, What is the final temperature of the coffee
Two metal spheres of different sizes are charged such that the electric potential is the same at the surface of each, What is the ratio QB/QA and EB/EA
A car drives straight off the edge of a cliff that is 58 m high. The police at scene of the accident observed that the point of impact is 121m from the base of cliff. How fast was the car traveling when it went over the cliff.
Julie throws a ball to her friend Sarah. The ball leaves Julie's hand a distance 1.5 meters above the ground with an initial speed of 22 m/s at an angle 63 degrees, What is the distance between the two girls
The electric field lines on the left have twice the separation of those on the right. If the magnitude of field at point-A is 60 V/m, what is the magnitude of the field at point-B.
Neglect friction, what steady force, applied at its outer edge and perpendicular to plane of the door, can move it from rest through an angle of 90° in 30 s.
What happens to the size of the force on the proton if the electron is moved 0.50 m closer to the proton.
A proton with v = 322 m/s is moving through a region in which the magnetic field is B = 2.2 T, what angle does the protons velocity make with B
A spherical weather balloon is filled with hydrogen until its radius is 3.00 m. Its total mass including the instruments it carries is 15.0 kg. Find the buoyant force acting on the balloon, assuming the density of air is 1.29 kg/m3. N
A 120 V potential difference is applied to a space heater whose resistance is 22.6 ohms when hot, How much thermal energy is produced in 8.8 hours
The first player has an acceleration whose magnitude is 0.5 m/s^2 and the second player's has an acceleration of 0.3 m/s^2. Explain by how much time passes before hey collide?
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