A jet airliner moving at 600 mph due east moves into a region where the wind is blowing at 120 mph in a direction 30.0° north of east. What is the new speed and direction of the aircraft?
a. 706 mph, 5.67° N of E
c. 706 mph, 4.87° N of E
b. 620 mph, 5.67° N of E
d. 588 mph, 4.87° N of E
C
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What makes us think that Mars must once have had an atmosphere that was warmer and had higher surface pressure?
A) The atmosphere is too cold and thin for liquid water today, yet we see evidence of flowing water in the past. B) We think it for purely theoretical reasons, based on calculations showing that the Sun has brightened with time. C) The presence of inactive volcanoes on Mars tells us that there must once have been a lot of outgassing, and hence a thicker atmosphere. D) The fact that parts of Mars have a lot of craters tell us that Mars must once have been much warmer.
The mass of 12C is 12 u where 1 u = 1.660 559 × 10^?27 kg. This mass is equal to
a. the mass of the 12C nucleus. b. the mass of the 12C nucleus plus 6 electrons. c. the mass of the 12C nucleus plus 12 electrons. d. the mass of 6 protons and 6 neutrons.
A metal bar is used to conduct heat. When the temperature at one end is 88.0°C and at the other is 15.0°C, heat is transferred at a rate of 19.0 J/s. The bar is then stretched uniformly to twice its original length. If again it has ends at 88.0°C and 15.0°C, at what rate will heat be transferred between it ends?
a. 4.75 J/s b. 9.50 J/s c. 19.0 J/s d. 38.0 J/s e. 76.0 J/s
At what speed would a proton need to circle the Earth at a height of 1 000 km above the equator if the Earth's magnetic field is horizontal and directed north-south, with an intensity of 4.00 × 10^-8 T? (The radius of the Earth is 6 400 km and the charge and mass of the proton are q = 1.60 × 10^-19 C and mp = 1.67 × 10^-27 kg. Ignore relativistic corrections.)