Which requires more energy?
A) melting a gram of 0°C ice
B) increasing the temperature of 1 gram of water from 0°C to 100°C
C) changing 1 gram of 100°C water to 100°C steam
D) all the same
Answer: C
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Waves on a String: A wave whose wavelength is 0.500 m is traveling down a 500-m long wire whose total mass is 25 kg and is under a tension of 2000 N.(a) What is the speed of the wave on the wire?(b) Find the frequency of this wave.
What will be an ideal response?
Which of the following statements is NOT true?
a. Like electric forces between charges, gravitational force varies according to the inverse-square law. b. The inverse-square law governs electrical forces, but not gravitational forces. c. Charges can be positive or negative, but mass can only be positive. d. Electrical forces can be attractive or repulsive, but gravitational force can only be attractive. e. Two charges can cancel each other out, but nothing cancels out gravity.
Sixty miles per hour is the same as
a) 129 ft/s b) 41 ft/s c) 21 ft/s d) 88 ft/s
In chemistry, oxidation occurs when a substance
A) loses electrons B) rearranges its electrons internally C) accepts electrons D) breaks into its constituent atoms