The atomic number of a given element is equivalent to which of the following?
a. proton number in the nucleus
b. neutron number in the nucleus
c. sum of the protons and neutrons in the nucleus
d. number of electrons in the outer shells
a
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The position of an object as a function of time is given by where and (a) Find the instantaneous acceleration at t =2.4 s. (b) Find the average acceleration over the first 2.4 seconds
What will be an ideal response?
A person who weighs 550 N empties her lungs as much as possible and is then completely immersed in water while suspended from a harness. Her apparent weight is now 21.2 N. What is her density?
A) 1050 kg/m3 B) 1040 kg/m3 C) 1030 kg/m3 D) 960 kg/m3 E) 56.1 kg/m3
The following images were all taken by spacecraft. Which one shows a comet?
Refer to the race described above. According to the spectators watching in the stands, what happens?
A) The light beam wins the race, but barely—it is going 1 percent of the speed of light faster than Ben. B) The light beam instantly finishes the race, before Ben even has a chance to start. C) The light beam wins the race by a large margin because it is going faster than Ben by the full speed of light. D) Ben beats the light beam to the finish line, becoming a hero.