________ states every body in the universe attracts every other body with a force that is directly proportional to their masses and inversely proportional to the square of the distance between them.
A) The law of universal gravitation
B) Retrograde motion
C) Inertia
D) Nebular theory
Ans: A) The law of universal gravitation
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Nuclear Binding Energy: Bismuth 
Bi is known to be radioactive. The stability of 
Bi with respect to alpha, beta-plus and beta-minus decay is to be determined. The following atomic masses are known:
A. subject to alpha decay only. B. subject to beta-plus decay only. C. subject to beta-minus decay only. D. subject to alpha or beta-plus decay, but not beta-minus decay. E. subject to alpha or beta-minus decay, but not beta-plus decay.
A 10-kg object is dropped from rest. After falling a distance of 50 m, it has a speed of 26 m/s. What is the change in mechanical energy caused by the dissipative (air) resistive force on the object during this descent?
A. ?1.3 kJ B. ?1.5 kJ C. ?1.8 kJ D. ?2.0 kJ E. ?2.3 kJ
A free electron and a free proton are released in identical electric fields. (i) How do the magnitudes of the electric force exerted on the two particles compare?
1.It is millions of times greater for the electron. 2.It is thousands of times greater for the electron. 3.They are equal. 4.It is thousands of times smaller for the electron. 5.It is millions of times smaller for the electron.
If I = 0.40 A in the circuit segment shown below, what is the potential difference Va ? Vb?
a.
31 V
b.
28 V
c.
25 V
d.
34 V
e.
10 V