How much heat is released when 30 g of water at 96°C cools to 25°C? The specific heat of water is 1 cal/g°C.
Answer: 2130 cal (endothermic)
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If the Sun passes directly overhead on at least one day per year, then
a. you are within 23.4° latitude of the equator. b. you are within 66.6° latitude of the equator. c. you must be exactly on the equator. d. you could be anywhere because this occurs at least once per year at any location on the Earth.
What is the beat frequency of two sounds that have equal amplitudes and frequencies of and 444. Hz?
What will be an ideal response?
A 150-kg crate is placed on an adjustable inclined plane. As one end of the incline is raised, the crate begins to move downward. If the crate slides down the plane with an acceleration of 0.20 m/s2 when the incline angle is 18°, what is the coefficient of kinetic friction between ramp and crate? (g = 9.8 m/s2)
a. 0.40 b. 0.50 c. 0.30 d. 0.20 e. 2.8
A floating leaf oscillates up and down two complete cycles in one second as a 10-meter long water wave passes by. What is the wave's speed?
A) 2 m/s B) 10 m/s C) 20 m/s D) 40 m/s E) more than 40 m/s