If an atom has become a positive ion, it has
A)
gained an electron or electrons.
B)
lost an electron or electrons.
C)
gained a proton or protons.
D)
gained a proton and an electron.
E)
lost a proton or protons.
B
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Only one of the statements below uses the term theory in its correct, scientific sense. Which one?
A) Einstein's theory of relativity has been tested and verified thousands of times. B) Evolution is only a theory, so there's no reason to think it really happened. C) I have a new theory about the cause of earthquakes, and I plan to start testing it soon. D) I wrote a theory that is 152 pages long.
A very long solenoid has 1.0 × 106 turns per meter and a cross-sectional area of 2.0 × 106 m2. A short, secondary coil with 1.0 × 103 turns is wound over the solenoid's midpoint
What emf is induced in the secondary coil if the current in the solenoid is changing at a rate of 4.0 A/s? A) 1.0 V B) 2.7 V C) 1.6 V D) 0.52 V E) 4.4 V
Which of the following is a feature of quantum physics that is not valid according to Newtonian physics?
A) The second law of thermodynamics. B) The universe is made of tiny particles. C) The future is entirely determined by the present. D) The principle of conservation of energy. E) Nature is non-local, i.e., separated objects are sometimes instantaneously connected with each other.
To what two quantities is work proportional?
A) acceleration and distance B) power and distance C) force and speed D) force and distance E) energy and distance