Venus may have started with an ocean's worth of water. Where is its water now?
A) The original water remains vaporized in the atmosphere due to Venus's intense heat.
B) Most of the water is frozen beneath the surface.
C) Most of the water combined with rocks in chemical reactions.
D) The water was lost when ultraviolet light broke apart water molecules and the hydrogen escaped to space.
E) The water changed to carbon dioxide through chemical reactions.
D
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A spool whose inner core has a radius of 1.00 cm and whose end caps have a radius of 1.50 cm has a string tightly wound around the inner core. The spool is free to roll without slipping on a horizontal surface
If the string unwinds horizontally from the top of the core with a constant speed of 29.0 cm/s, what is the speed of the spool? A) 17.4 cm/s B) 25.0 cm/s C) 37.5 cm/s D) 50.0 cm/s E) 75.0 cm/s
An inventor wants you to finance construction of a machine that will run at room temperature by using the free thermal energy available in the air itself. Should you invest $100,000? Why or why not?
What will be an ideal response?
The plates of a parallel-plate capacitor are maintained with constant voltage by a battery as they are pulled apart. During this process, the amount of charge on the plates must
A) increase. B) decrease. C) remain constant. D) either increase or decrease. There is no way to tell from the information given.
At what angle will the highest order (m value) maximum appear for a wavelength 400 nm using a grating with 600 lines per mm?
a. 54° c. 74° b. 90° d. 36°