A strobe photograph shows equally spaced images of a car moving along a straight road. If the time intervals between images is constant, which of the following cannot be positive?
a. the speed of the car
c. the acceleration of the car
b. the average velocity of the car
d. the direction of motion of the car
C
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A spherical conducting shell has a uniform surface charge density of 
What is its radius if the electric field 1.5 m from its center is 17 N/C outward?
A. 3.9 cm B. 4.7 cm C. 3.2 cm D. 9.5 cm E. 6.4 cm
Which of the following is a feature of quantum physics but not a feature of Newtonian physics?
A) Determinism: The future is entirely determined by the present. B) Force at a distance: Objects can exert forces on other objects that are some distance away, across empty space. C) The observation process must be included as part of the theory. D) The principle of conservation of energy. E) All of the above.
A cylindrical tank is assembled by welding steel sections circumfer-entially. Tank diameter is 1.5 m, thickness is 20 mm, and internal pressure is 2.0 MPa. The maximum tensile stress perpendicular to the welds is approximately:
(A) 22 MPa
(B) 29 MPa
(C) 33 MPa
(D) 37 MPa
A roller coaster car is on a track that forms a circular loop in the vertical plane. If the car is to just maintain contact with track at the top of the loop, what is the minimum value for its centripetal acceleration at this point?
A) g downward B) 2 g upward C) 0.5 g downward D) g upward E) 2 g downward