How will the Sun end its life?

A) as a white dwarf
B) as a white dwarf supernova
C) as a massive star supernova
D) as a neutron star or black hole


A) as a white dwarf

Physics & Space Science

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A pane of glass having transmissivity of 0.8 between wavelengths of 0 to 4 ?m and 0 above 4 ?m is subjected to direct radiation from the sun on one side and from a room on the other side. Assume that the sun is a black body at 6000 K and the room is a black body at 300 K. Determine the net radiation through the glass.

Physics & Space Science

If the distance from a point source of EM radiation is doubled, the intensity is

A. doubled B. the same as it was before. C. reduced by a factor of four. D. increased by a factor of four. E. cut in half.

Physics & Space Science

A 6.00-kg block is placed on a 30.0° incline and connected to another block on a 36.87° incline. Although the surfaces are frictionless the blocks do not move. What is the mass in kilograms of the block on the 36.87° incline?

?

?

a.
1.80

b.
3.00

c.
4.00

d.
5.00

e.
6.00

Physics & Space Science

Equilibrium: A store's sign has a mass of 20 kg and is 3.0 m long. It is uniform, so its center of gravity is at the center of the sign. It is supported horizontally by a small loose bolt attached to the wall at one end and by a wire at the other end, as shown in the figure. What is the magnitude of the net force that the bolt exerts on the sign?

A. 460 N B. 230 N C. 200 N D. 120 N E. 300 N

Physics & Space Science