A 20 turn coil of area 10 cm2 is placed in a magnetic field so that the normal to its area is in the direction of the field. If the field originally has a value of 0.25 T that increases to 0.35 T in 2.0 s, what is the average emf induced in the coil?
A. 7.0 mV
B. 2.0 mV
C. 1.0 mV
D. 3.5 mV
E. 4.0 mV
C. 1.0 mV
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The center of our galaxy is 30,000 light years away. Could a person possibly travel there in her own lifetime?
A) No, because a person cannot travel at lightspeed. B) No, because the trip would take longer than 30,000 years, and nobody lives this long. C) No, because time dilation applies only to clocks and not to biological phenomena such as a person's lifetime. D) Yes, by traveling at nearly lightspeed, because of time dilation or the "relativity of time." E) Yes, by traveling faster than lightspeed, because of time dilation or the "relativity of time."
The maximum elongation of a typical metal is reached at the breaking point
Indicate whether the statement is true or false
An electric heater is rated 300W 110V. The safety fuse in the circuit can withstand 15 A of current. How many heaters can be safely operated in the circuit?
A) 2 B) 3 C) 4 D) 5 E) more than 5
Estimation: Estimate the number of times an average person's heart beats in a lifetime. Assume the average heart rate is 69 beats/min and a life span of 75 years.
A. 3 × 109 beats B. 3 × 108 beats C. 3 × 1010 beats D. 3 × 107 beats