In order to jump off the floor, the floor must exert a force on you
a. in the direction of and equal to your weight.
b. opposite to and equal to your weight.
c. in the direction of and less than your weight.
d. opposite to and less than your weight.
e. opposite to and greater than your weight.
e
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An object is in front of a concave spherical mirror, and its image is 4.0 cm behind the mirror. If the focal length of the mirror has a magnitude of 5.0 cm, where is the object?
A) 2.2 cm in front of the mirror B) 2.2 cm behind the mirror C) 9.0 cm in front of the mirror D) 1.0 cm behind the mirror
Energy in Capacitors: When a 4-?F capacitor has a potential drop of 20 V across its plates, how much electric potential energy is stored in this capacitor?
A. 0.8 ?J B. 8 ?J C. 80 ?J D. 800 ?J E. 8000 ?J
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
The power consumed by a device drawing 0.8 A when connected to 120 V is
A) 12 W. B) 15 W. C) 60 W. D) 96 W. E) 120 W.