Different samples of a pure compound always
contain the same elements in
a) exactly equal amounts.
b) the same proportion by volume.
c) the same proportion by mass.
d) varying proportions depending on the temperature.
c
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What causes the outward gas pressure that balances the inward pull of gravity in a main-sequence star?
a. the rapid outward flow of gas b. the rapid inward flow of the gas c. the high temperature of the gas d. the high density of the gas e. the high temperature and the high density of the gas
A curved mirror that produces an enlarged image will also have a greater field of view than a plane mirror
a. True b. False Indicate whether the statement is true or false
A sensitive ammeter is connected to a wire loop and placed within the magnetic field of a strong horseshoe magnet. The ammeter shows a deflection when:
a. the wire is moved parallel to the field. b. the wire is moved perpendicularly to the field. c. neither wire nor magnet is moving. d. the wire's axis is parallel to the field.
An unknown resistor is wired in series with an ammeter, and a voltmeter is placed in parallel across both the resistor and the ammeter. This network is then placed across a battery
If one computes the value of the resistance by dividing the voltmeter reading by the ammeter reading, the value obtained A) is less than the true resistance. B) is greater than the true resistance. C) is the true resistance. D) could be any of the given answers. It depends on other factors.