Lenz's Law: According to Lenz's law, the induced current in a circuit always flows to oppose the external magnetic flux through the circuit.
A. True
B. False
Answer: B
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A porch roof sloping at 45° accumulated snow to a depth of 30. cm. The roof measured 3.0 m × 5.0 m. If the density of snow was 15. kg/ m2, what was the weight of the snow, in pounds, on the roof?
A) 210 lb B) 74 lb C) 56 lb D) 148 lb E) 105 lb
Hydrogen emits light at certain discrete frequencies. One particular emission has a frequency of 4.57 × 1015 s-1, as measured in the frame of reference of the hydrogen atom
Light from this emission is observed coming from a star that is moving away from Earth at 0.900c. What is the observed frequency? Note that, in addition to time dilation, one must take into account that successive wavefronts have to travel longer distances because the star is moving away (Doppler Effect). A) 1.99 × 1015 s-1 B) 7.62 × 1015 s-1 C) 1.99 × 1016 s-1 D) 1.05 × 1015 s-1 E) 0.90 × 1015 s-1
A -7.0-?C point charge has a positively charged object in an elliptical orbit around it. If the mass of the positively charged object is 1.0 kg and the distance varies from 5.0 mm to 20.0 mm between the charges,
what is the maximum electric potential difference through which the positive object moves? (k = 1/4??0 = 8.99 × 109 N ? m2/C2) A) 9.4 MV B) 3.2 MV C) 4.2 MV D) 16 MV
An electron is in an infinite square well that is 2.6 nm wide
What is the smallest value of the state quantum number n for which the energy level exceeds 100 eV? (h = 6.626 × 10-34 J ? s, mel = 9.11 × 10-31 kg, 1 eV = 1.60 × 10-19) A) 43 B) 45 C) 44 D) 42 E) 41