The density of an object is defined as
a. the volume occupied by each unit of mass.
b. the amount of mass for each unit of volume.
c. the weight of each unit of volume.
d. the amount of the substance that has unit volume and unit mass.
e. the amount of the substance that contains as many particles as 12 grams of the carbon-12 isotope.
b
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If the frequency of blinks for a light source appears to double as the light source approaches you, the frequency of blinks as it moves away from you at the same speed
A) is halved. B) is doubled. C) stays the same.
Ohm’s law states
a) a relationship between voltage, current and charge. b) that less current flows when a higher voltage is applied. c) that the more resistance in a circuit, the more electric current will flow if the voltage is kept constant. d) that the current in an electric circuit increases if the potential difference across the circuit is increased. •
How much tension must a cable withstand if it is used to accelerate a 1200-kg car vertically upward at 0.70m/s2?
What will be an ideal response?
A ceiling fan is turned on and reaches an angular speed of 120 rev/min in 20 s. It is then turned off and coasts to a stop in an additional 60 s. The ratio of the average angular acceleration for the first 20 s to that for the last 60 s is which of the following?
a. 3 c. 0.3 b. –3 d. –0.3