Which of the following energy forms is involved in winding a pocket watch?
a. electrical energy
b. nonmechanical energy
c. gravitational potential energy
d. elastic potential energy
Ans: d. elastic potential energy
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A relativistic proton has a momentum of 1.0 × 10-17 kg ? m/s and a rest energy of 0.15 nJ. What is the kinetic energy of this proton? (c = 3.00 × 108 m/s, mproton = 1.67 × 10-27 kg)
A) 1.3 pJ B) 1.6 pJ C) 3.0 pJ D) 2.2 pJ E) 2.5 pJ
Two vectors 
and 
are given by 
and
style="vertical-align:middle;" src="https://sciemce.com/media/2/ppg__cognero__Chapter_9_Energy_in_Nonisolated_Systems.__media__bf8af0f8-35eb-471f-a479-9b4f159e5328.PNG" data-wiris-created="true" class="Wirisformula" align="middle" />. The scalar product of and a third vector 
is ?16. The scalar product of and is +18. The z component of is 0. What is the magnitude of ?
A. 7.8
B. 6.4
C. 3.6
D. 5.0
E. 4.8
Charges q and Q are placed on the x axis at x = 0 and x = 2.0 m, respectively. If q = ?40 pC and Q = +30 pC, determine the net flux through a spherical surface (radius = 1.0 m) centered on the origin.
A. ?9.6 N ? m2/C B. ?6.8 N ? m2/C C. ?8.5 N ? m2/C D. ?4.5 N ? m2/C E. ?1.1 N ? m2/C
The gravitational force is a conservative force
Indicate whether the statement is true or false