Which of the following is not key evidence in support of the idea that all life today shares a common ancestor?
A) We have identified fossils of the first life forms that ever existed on Earth.
B) All life uses DNA and the same genetic code.
C) Mapping of gene sequences shows how life is all related.
D) All life builds proteins from the same amino acids and uses ATP to store energy in cells.
A) We have identified fossils of the first life forms that ever existed on Earth.
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20.0 L of a monatomic ideal gas at a pressure of 100 kPa expand adiabatically until the volume doubles. What is the pressure in the gas at that point?
A) 31.5 kPa B) 50.0 kPa C) 200 kPa D) 317 kPa E) 400 kPa
During an isothermal process, 5.0 J of heat is removed from an ideal gas. How much work does the gas do during this process?
A) 5.0 J B) 10 J C) -5.0 J D) 2.0 J E) 0.00 J
This figure shows an airplane traveling east to west along Earth's equator at the same speed that Earth rotates from west to east. People on Earth would, of course, simply see the airplane fly westward at 1,670 km/hr. What is the significance of the difference in viewpoints between people on Earth and people on the Moon?
A) It shows that motion is relative not absolute. B) It shows that you can get a wrong answer if you don't view the situation from the correct perspective. C) It shows that the airplane is traveling in a direction opposite to Earth's rotation. D) It shows that airplanes can move quite fast if you view them from the right place.
A stationary 1.67-kg object is struck by a stick. The object experiences a horizontal force given by F = at - bt2, where t is the time in milliseconds from the instant the stick first contacts the object
If a = 1500 N/(ms) and b = 20 N/(ms)2, what is the speed of the object just after it comes away from the stick at t = 2.74 ms? A) 3.3 m/s B) 22 m/s C) 3.7 m/s D) 25 m/s