In terms of the global warming that has been occurring on Earth over the past few decades, what is the key message from this figure?
A) Changes in the Sun's energy output (irradiance) cannot explain the observed warming.
B) The Sun's energy output (irradiance) tracks quite well with the observed warming trend.
C) The Sun's energy output (irradiance) and Earth's global average temperature both vary in an 11-year cycle.
D) Scientists have no way to explain the observed global warming trend.
A) Changes in the Sun's energy output (irradiance) cannot explain the observed warming.
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The angular acceleration of a wheel is given in rad/s2by 45t3 – 11t4, where t is in seconds. If the wheel starts from rest at t = 0.00 s, when is the next time the wheel is at rest?
A) 5.1 s B) 8.4 s C) 6.9 s D) 3.6 s
An object is attached to a spring, and its frequency of oscillation is measured. Then another object is connected to the first object, and the resulting mass is nine times the original value. By what factor is the frequency of oscillation changed?
a. 9 c. 1/3 b. 3 d. 1/9
In the process of pair production, which of the following is a possible product pair?
A) electron-neutron B) proton-neutron C) electron-positron D) proton-positron E) electron-proton
A gold atom has an atomic number of 79 and an atomic mass number of 197. If it is neutral, how many protons, neutrons, and electrons does it have?
A) 79 protons, 118 neutrons, 79 electrons B) 79 protons, 118 neutrons, 118 electrons C) 79 protons, 118 neutrons, 39 electrons D) 118 protons, 79 neutrons, 118 electrons E) 118 protons, 39 neutrons, 118 electrons