A quantitative observation that is the basis of scientific investigation is a(n)
a. experiment.
b. measurement.
c. explanation.
d. number.
b
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Motional Emf: As shown in the figure, one end of a metal bar is in contact with a circular rail and the other end is pivoted at P. A steady uniform, magnetic field B into the page is present. As the bar rotates about point P in a clockwise direction, the direction of the induced current through the resistor R is
A. from a to b. B. from b to a. C. No current is induced.
What causes precession?
What will be an ideal response?
Which of the following masses separates low mass stars from high mass stars?
A) about 50 solar masses B) about 1 solar mass C) about 2 solar masses D) about 150 solar masses E) about 0.08 solar masses
A crying baby emits sound with an intensity of 8.0 × 10-8 W/m2. Calculate a reasonable estimate for the intensity level from a set of quintuplets (five babies),
all crying simultaneously at the same place? The lowest detectable intensity is 1.0 × 10-12 W/m2. A) 79 dB B) 69 dB C) 56 dB D) 49 dB E) 36 dB