Power: How much does it cost to operate a 25-W soldering iron for 8.0 hours if energy costs 8.0¢/kWh?
A. $1.50
B. 25¢
C. 16¢
D. 1.6¢
Answer: D
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Applications to Astronomy: The earth's orbit has a mean radius of 1.5 × 108 km. Over a six-month period, the apparent position of a particular star varies by 0.00014° due to parallax. How many light-years is this star from Earth? (1 ly = 9.46 × 1015 m)
A. 0.13 ly B. 1.3 ly C. 13 ly D. 130 ly
Consider the following procedural steps:
(1) ground the electroscope (2) remove the ground from the electroscope (3) touch a charged rod to the electroscope (4) bring a charged rod near, but not touching, the electroscope (5) remove the charged rod To charge an electroscope by induction, use the sequence: A) 1, 4, 5, 2 B) 4, 1, 2, 5 C) 3, 1, 2, 5 D) 4, 1, 5, 2 E) 3, 5
The resistivity of a 1.0 m long wire is 1.72 × 10-8 ?m and its cross sectional area is 2.0 × 10-6 m2. If the wire carries a current of 0.20 A, what is the voltage across the wire?
A) 17 mV B) 0.90 mV C) 1.7 mV D) 10 mV E) 90 mV
A 320-g air track cart is traveling at 1.25 m/s and a 270-g cart traveling in the opposite direction at 1.33 m/s. What is the speed of the center of mass of the two carts?
A) 2.80 m/s B) 0.0693 m/s C) 0.131 m/s D) 1.47 m/s E) 1.29 m/s