When a 5-N block of wood floats in mercury the buoyant force on it is
A) less than 5 N.
B) 5 N.
C) greater than 5 N.
Answer: B
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A Carnot refrigerator has a COP of 2.0
(a) What is its efficiency operated as an engine? (b) Operated as an engine, heat is taken in at 500.°C; what is the exhaust Celsius temperature?
The potential energy of a spring of constant k that has been stretched a distance x is given by
A. (½)kx. B. kx2. C. (½)kx2. D. (½)k/x. E. kx.
An electron in a hydrogen atom makes a transition from the n = 4 to the n = 3 energy state. Determine the energy (in eV) of the emitted photon
a. 0.54 b. 0.66 c. 0.85 d. 1.51 e. 10.2
Consider the following statement: "Rocky asteroids are found primarily in the asteroid belt and Kuiper belt, while icy comets are found primarily in the Oort cloud." What's wrong with this statement?
A) The Kuiper belt contains icy comets, not rocky asteroids. B) Asteroids are not really made of rock. C) Comets are not really icy. D) The Oort cloud has nothing to do with comets. E) The statement is accurate as written.