A electric heater that draws 13.5 A of dc current has been left on for 10 min. How many electrons that have passed through the heater during that time? (e = 1.60 × 10-19 C)
A) 1.5 × 1022
B) 5.1 × 1022
C) 1.8 × 103
D) 8.1 × 103
E) 1.0 × 1023
B
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Torque: The figure shows a person's foot. In that figure, the Achilles tendon exerts a force of magnitude F = 720 N. What is the magnitude of the torque that this force produces about the ankle joint?
A. 12 N ? m B. 16 N ? m C. 21 N ? m D. 26 N ? m E. 36 N ? m
Compute the voltage drop along a 30-m length of household no. 14 copper wire (used in 15-A circuits). The wire has diameter 1.628 mm and carries a 13-A current. The resistivity of copper is 1.68×10?8??m.
Do you think it is possible that a flare star could harbor an advanced civilization? Explain your reasoning
What will be an ideal response?
The best determination of the Hubble constant using Cepheid variables found in distant galaxies by the Hubble telescope suggests
a. that the Hubble constant is about 0.07 km/sec/Mpc. b. that the Hubble constant is about 7 km/sec/Mpc. c. that the Hubble constant is about 70 km/sec/Mpc. d. that the Hubble constant is about 700 km/sec/Mpc.