What is the magnetic force on a 2.0-m length of (straight) wire carrying a current of 30 A in a region where a uniform magnetic field has a magnitude of 55 mT and is directed at an angle of 20° away from the wire?
a. 1.5 N
b. 1.3 N
c. 1.1 N
d. 1.7 N
e. 3.1 N
C
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If a comet's ion tail is pointing perpendicular to its direction of travel, the comet is
A) close to or at aphelion. B) moving away from the Sun. C) close to or at perihelion. D) moving closer to the Sun. E) A comet's tail never points perpendicular to its motion.
When hydrogen reacts with ethene, what is the product?
a. Cycloethene b. Ethane c. Propene d. Ethyne e. Methane
According to the shell model, which electrons play the most significant role in determining the properties of an atom?
A) those in the innermost shell B) those in the shells between the innermost and outermost shells C) those in the outermost shell D) Electrons in every shell are just about equally important.
The Sun is gradually increasing in luminosity as it ages. It is about 30% more luminous than it was when it was born. Why isn't this increase considered to be an explanation for global warming?
A) The Sun is increasing in luminosity way too slowly, over many millions of years. B) What the Sun was doing millions of years ago is what determines Earth's temperature, since the Earth doesn't respond directly to what the Sun is doing today. C) The amount of energy the Earth receives from the Sun remains constant regardless of what the Sun does. D) The scientists are covering up this potentially valid explanation.