Which of the following do winds on Mars NOT cause
A) global dust storms
B) local dust storms
C) hurricanes
D) dust devils
C
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Bright lines in an emission spectrum represent:
A) regions from which light travels more rapidly and reaches us more quickly B) flaws in the telescopes and spectroscopes that astronomers use to measure spectra C) photons absorbed when an electron jumps from a lower to a higher energy level D) particular energies of light that are emitted from a distant object E) photons absorbed when an electron jumps from a higher to a lower energy
A 320-kg satellite experiences a gravitational force of 800 N. What is the radius of the satellite's orbit? (Earth's radius is 6,400 km.)
A. 6,400 km B. 12,800 km C. 19,200 km D. 25,600 km
A mole of diatomic oxygen molecules and a mole of diatomic nitrogen molecules are at STP. Which statements are true about these molecules? (There could be more than one correct choice.)
A) Both gases have the same average molecular speeds. B) Both gases have the same number of molecules. C) Both gases have the same average kinetic energy per molecule. D) Both gases have the same average momentum per molecule.
A 35-mm single lens reflex (SLR) digital camera is using a lens of focal length 35.0 mm to photograph a person who is 1.80 m tall and located 3.60 m from the lens
(a) How far is the CCD sensor from the lens when the person is in focus? (b) How tall is the person's image on the CCD sensor?