All electric devices are required to have identifying plates that specify their electrical characteristics. The plate on a certain steam iron states that the iron carries a current of 6.00 A when connected to a source of 1.20 × 102 V. What is the resistance of the steam iron?
1.0.050 0 W
2.20.0 W
3.36.0 W
2
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If the Universe were infinitely large, infinitely old, and static, then the CMB would appear uniform (i.e., homogenous and isotropic)
a. True b. False Indicate whether the statement is true or false
Astronomers believe that a spiral galaxy may form
A) from a collision between a small and large galaxy. B) due to a quasar shutting down. C) from the sudden contraction of an elliptical galaxy. D) from the collision of two giant elliptical galaxies. E) from the explosion of a dwarf irregular galaxy.
Aberration: Spherical lenses suffer from
A. both spherical and chromatic aberration. B. spherical aberration, but not chromatic aberration. C. chromatic aberration, but not spherical aberration. D. neither spherical nor chromatic aberration.
We proved, using Einstein's two basic principles, that if Velma is moving past Mort then Mort should observe Velma's clock to go slow. This behavior of Velma's clock occurs because, as observed by Mort,
A) the light beam in her light-clock travels less than 300,000 km during one of Velma's ticks. B) the light beam in her light-clock travels further than 300,000 km during one of Velma's ticks. C) Velma's light-clock shortens along its direction of motion. D) the light beam in Velma's light-clock travels at slower than the normal lightspeed. E) the light beam in Velma's light-clock travels at faster than the normal lightspeed.