A proton in a certain particle accelerator has a kinetic energy that is equal to its rest energy. What is the TOTAL energy of the proton as measured by a physicist working with the accelerator? (c = 3.00 × 108 m/s, mproton = 1.67 × 10-27 kg)
A) 5.69 × 10-11 J
B) 1.50 × 10-10 J
C) 2.07 × 10-10 J
D) 3.01 × 10-10 J
E) 8.77 × 10-10 J
Answer: D
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Impulse: During World War I, Germany used a "Big Bertha" cannon to hurl shells into Paris 30 miles away. This gun also had a very long barrel. What was the reason for using a long barrel in these guns?
A. to exert a larger force on the shells B. to reduce frictional losses C. to allow the force of the expanding gases from the gunpowder to act for a longer time D. to increase the force exerted on the bullet due to the expanding gases from the gunpowder E. to reduce the force exerted on the bullet due to the expanding gases from the gunpowder
Which of the following is true about Bragg planes?
The laws of conservation of energy and momentum:
a. apply in all circumstances. b. are disproved by quantum mechanics. c. do not apply at the subatomic level. d. apply to some interactions but not at all to some others. e. are broken only for unmeasurable lengths of time.
If an object's mass decreases while a constant force acts on it, the acceleration
A) decreases. B) remains the same. C) increases. D) will be zero.