The mass number of an atom is determined by the weight of:
a. neutrons and protons
b. neutrons and electrons
c. protons and electrons
d. protons only
e. neutrons only
a
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The first attempt to map the Galaxy via star counts was done by
A) William Herschel in the late eighteenth century. B) Edwin Hubble with the new 100" Mt. Wilson telescope in the 1930s. C) Harlow Shapley with the RR Lyrae variables in 1920. D) Edward Barnard with long exposure photos about 1900. E) Galileo in 1612.
A low-power source of energy could put out a lot of work provided it
A) exerted its power over a very large distance. B) operated for a short time. C) operated for a long time. D) exerted a sufficiently strong force. E) Nonsense-- there is no way that a low-power source can put out a large amount of work.
When operating on a 120-V circuit, an electric heater receives 1.30 × 103 W of power, a toaster receives 1.00 × 103 W, and an electric oven receives 1.54 × 103 W. If all three appliances are connected in parallel on a 120-V circuit and turned on, what is the total current drawn from an external source?
1.24.0 A 2.32.0 A 3.40.0 A 4.48.0 A 5.none of those answers
For motion in a straight line under constant acceleration in the x-direction, which of the following determines the positive directions for displacement, velocity, and acceleration?
1.Each of the listed quantities may have its positive direction chosen independently of each other. 2.the initial velocity 3.the positive direction of the x-axis 4.the initial acceleration