Two resistors with resistances of 5.0 ? and 9.0 ? are connected in parallel. A 4.0-? resistor is then connected in series with this parallel combination
An ideal 6.0-V battery is then connected across the series-parallel combination. What is the current through (a) the 4.0-? resistor and (b) the 5.0-? resistor?
(a) 0.83 A (b) 0.53 A
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Young's Modulus: A 50-kg air conditioner is placed on top of a concrete pad that is 20 cm thick and has a cross-sectional area of 3.0 m2. What is the change in thickness of the pad caused by the air conditioner? Young's modulus for concrete is 2.3 × 1010 N/m2.
A. 1.4 × 10-9 m B. 2.8 × 10-9 m C. 1.4 × 10-8 m D. 1.4 × 10-7 m E. 2.8 × 10-8 m
What is the potential difference VB ? VA when the I = 1.5 A in the circuit segment below?
a.
+22 V
b.
?22 V
c.
?38 V
d.
+38 V
e.
+2.0 V
The image of an object at the focal point of a concave spherical mirror
a. looks the same as the object. b. is said to be formed at infinity. c. is real. d. is reduced.
A uniform film of oil (n = 1.31) is floating on water. When sunlight in air is incident normally on the film, an observer finds that the reflected light has a brightness maximum at l = 450 nm and a brightness minimum at l = 600 nm. What is the thickness of the oil film?