A car and a large truck traveling at the same speed collide head-on and stick together. Which vehicle undergoes the larger change in the magnitude of its momentum?
1.the car
2.the truck
3.the change in the magnitude of momentum is the same for both
4.impossible to determine without more information
3
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How does a rocket launch upward? Choose the statement that correctly answers the question.
A) By expelling gas downward, the rocket is propelled upward. B) Expelling gas downward, which by pushing against the ground, propels the rocket upward.
How many photons per second emerge from a laser of power with wavelength (c = 3.00 × 108 m/s, h = 6.626 × 10-34 J ? s)
A) 6.09 × 1015 photons/s B) 5.03 × 1012 photons/s C) 3.07 × 1015 photons/s D) 3.07 × 1013 photons/s
Imagine a planet like Earth orbiting the Sun, at an average distance of 1 AU but with a highly eccentric orbit. Which of the following statements about this orbit is not true?
A) The period is longer than a year. B) The seasons are very extreme. C) The planet is sometimes very close to the Sun, and sometimes very far. D) The planet does not maintain a constant speed around the Sun.
A series of fission reactions in which subsequent reactions are initiated by the neutrons produced in the previous reactions is called a
A) critical reaction. B) chain reaction. C) usion reaction. D) neutron catastrophe. E) chemical reaction.