Thermodynamic Devices: A Carnot air conditioner has a coefficient of performance of 17.0 and removes 72.0 MJ of heat from the interior of a house every hour. How much power does it consume?
A. 1180 W
B. 1320 W
C. 520 kW
D. 3.14 MW
E. 1.25 MW
Answer: A
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After the first solid grains formed in our solar system, these particles could then grow by the process of ____, the collision and sticking of one particle with another to continue the formation of planetesimals. Each of these has many atoms or molecules
a. Accretion b. Sublimation c. Hydration d. Condensation e. Vaporization
Circular Motion of Charges: A proton, starting from rest, accelerates through a potential difference of 1.0 kV and then moves into a magnetic field of 0.040 T at a right angle to the field. What is the radius of the proton's resulting orbit? (e = 1.60 × 10-19 C, mproton = 1.67 × 10-27 kg)
A. 0.080 m B. 0.11 m C. 0.14 m D. 0.17 m
Ernest Rutherford
A) observed back-scattering from nuclei. B) discovered radium and polonium. C) proposed the tiny central nucleus idea. D) invented the particle detector tube. E) proposed the plum-pudding model.
What star is the most likely to have made the atoms of gold in your jewelry or your electronics?
A) a high-mass star B) a low-mass star C) the Sun D) a white dwarf