In a collision the total ____________ is the same before and after
Fill in the blank(s) with correct word
linear momentum
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A heat engine exhausts 3 200 J of heat while performing 1 500 J of useful work. What is the efficiency of the engine?
a. 68% b. 32% c. 16% d. 50% e. 84%
A proton and an electron are both accelerated to the same final kinetic energy. If ?p is the de Broglie wavelength of the proton and ?3 is the de Broglie wavelength of the electron, then
A) ?p > ?e. B) ?p = ?e. C) ?p < ?e. D) Not enough data to answer this question.
A bucket is being lowered by a very light rope with a constant downward velocity. The force that the rope exerts on the bucket must be
A) equal to the force that Earth exerts on the bucket. B) greater than the force that Earth exerts on the bucket. C) less than the force that Earth exerts on the bucket.
We are among the products of nuclear fusion and gravitational contraction
a. True b. False Indicate whether the statement is true or false