Dark dust clouds are optically invisible, but give off radio energy
Indicate whether the statement is true or false
TRUE
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A car travels in a due northerly direction at a speed of 55 km/h. The traces of rain on the side windows of the car make an angle of 60 degrees with respect to the horizontal. If the rain is falling vertically with respect to the Earth, what is the speed of the rain with respect to the Earth?
a. 48 km/h b. 95 km/h c. 58 km/h d. 32 km/h e. 80 km/h
What is the wavelength of the emitted photon if an electron in the hydrogen atom makes a transition from the n = 7 state to the n = 2 state? (c = 3.00 × 108 m/s, h = 6.626 × 10-34 J ? s, 1 eV = 1.60 × 10-19 J)
A) 199 nm B) 365 nm C) 4480 nm D) 398 nm E) 796 nm
Stalagmites are
a. Rocks solidified from molten material below ground. b. Consolidated sediment deposited in layers. c. Dripstone formations that form on cavern floors. d. Dripstone formations that form on cavern ceilings.
The position of a 0.64-kg mass undergoing simple harmonic motion is given by x = (0.160 m) cos (pt/16). What is its position at t = 6.0 s?
a. 0.160 m c. 0.061 m b. 0.159 m d. 0.089 m