What does the prefix giga- stand for?
What will be an ideal response?
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Which of the following types of data provide evidence that helps us understand the life tracks of low-mass stars?
A) H-R diagrams of globular clusters B) H-R diagrams of open clusters C) observing a low-mass star over many years D) spacecraft observations of the Sun
Galaxies seem to be made mostly of dark matter. One type of evidence for this comes from observations of the
A) energy emitted by distant quasars, which is far larger than can be explained by the visible matter in the quasars. B) gravitational bending of light from distant galaxies as it passes other galaxies on its way to Earth. C) redshift in the light from the earliest galaxies in the universe. D) force of gravity acting on laboratory objects. E) redshift in the light from the explosions of distant supernovas.
A magnifying glass uses a converging lens with a refractive power of 20 diopters. What is the magnification if the image is to be viewed by a relaxed eye (image at the far point) having a near point of 25 cm and a far point at infinity?
A) 5.0 x B) 3.0 x C) 4.0 x D) 1.0 x E) 2.0 x
A body is oscillating up and down at the end of a spring. Let's consider when the body is at the top of its up and down motion. The displacement vector from the equilibrium position
a. is zero c. points up b. has its largest magnitude d. points down