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
3
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Analysis of ________ stars has shown that star masses are in the range of ________ to ________ solar masses.
A. spinning; 1; 100 B. binary; 1; 10 C. binary; 30; 0.1 D. spinning; 1,000; 0.1 E. binary; 100; 1
Wave interference occurs for
A) sound waves. B) light waves. C) water waves. D) all of the above E) none of the above
Classify the following statement as a characteristic
(a) of electric forces only, (b) of magnetic forces only, (c) of both electric and magnetic forces, or (d) of neither electric nor magnetic forces. The force exerted on a moving charged object is zero.
1.electric forces 2.magnetic forces 3.both electric and magnetic forces 4.neither electric nor magnetic forcesWhat is the energy of a photon that, when it is absorbed by a hydrogen atom, excites an electron from the ground state of the hydrogen atom to the n = 2 state?
A) 10.2 eV B) 1.63 × 10-18 J C) 1.63 × 10-18 Nm D) All of the answers are correct. E) None of the answers is correct.