A swimmer heading directly across a river 200 m wide reaches the opposite bank in 6 min 40 s. She is swept downstream 300 m. How fast can she swim in still water?
A) 1.24 m/s
B) 1.83 m/s
C) 0.50 m/s
D) 1.42 m/s
E) 0.25 m/s
C
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The element first found in the Sun's spectrum, then on Earth 30 years later, is:
A) hydrogen. B) helium. C) solarium. D) technetium. E) aluminum.
A 0.150-kg air track cart is attached to an ideal spring with a force constant (spring constant) of 3.58 N/m and undergoes simple harmonic oscillations. What is the period of the oscillations?
A) 2.57 s B) 0.527 s C) 0.263 s D) 1.14 s E) 1.29 s
It is quantization of electron angular momentum that is the heart of the Bohr Model
What will be an ideal response?
Two point charges are placed along a horizontal axis with the following values and positions: +3.0 µC at x = 0 cm and -6.0 µC at x = 20 cm. At what point along the x axis is the electric field zero?
a. 8.0 cm c. -38 cm b. -48 cm d. -69 cm