An object 3.4 mm tall is placed 25 cm from the vertex of a convex spherical mirror. The radius of curvature of the mirror has a magnitude of 52 cm
(a) How far is the image from the vertex of the mirror?
(b) What is the height of the image?
What will be an ideal response?
(a) 13 cm (b) 1.7 mm
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Intensity of Sound: The intensity at a distance of 6.0 m from a source that is radiating equally in all directions is 6.0 × 10-10 W/m2. What is the intensity level in dB? The threshold of human hearing is 1.0 × 10-12 W/m2.
A. 18 dB B. 23 dB C. 28 dB D. 32 dB
Automobile air bags reduce what during a collision?
A) speed of the automobile B) the forces exerted upon the passenger C) the kinetic energy transferred to the passenger D) the impulse exerted upon the passenger
If the input to an RLC series circuit is 
, then the current in the circuit is
A.
.B.
.?C.
.D.
.E.
.A cylindrical capacitor is made of two thin-walled concentric cylinders. The inner cylinder has radius r1 = 4.0 mm, and the outer one a radius r2 = 8.0 mm. The common length of the cylinders is L = 150 m
What is the potential energy stored in this capacitor when a potential difference 4.0 V is applied between the inner and outer cylinder? (k = 1/4??0 = 8.99 × 109 N • m2/C2) A) 9.6 × 10-8 J B) 1.3 × 10-8 J C) 6.3 × 10-8 J D) 0.34 × 10-8 J E) 4.6 × 10-8 J