The isotope 14C cannot be used in dating old samples of which of the following?
a. a bronze implement from a cave
b. charcoal from a fire
c. a bone buried in mud
d. All of these choices can be dated using 14C.
A
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If electricity costs 7.06ยข/kW?h, how much would it cost you to run a 120W stereo system 4 hours per day for 4 weeks
A) $0.14 B) $0.95 C) $2.66 D) $1.62
The back emf in an electric motor is its maximum value under which condition?
a. motor speed is zero b. current is a maximum c. voltage is a maximum d. motor speed is a maximum
The equation of continuity applied to an incompressible ideal fluid flowing through a pipe of varying diameter is based on what of the following being conserved for the fluid in the pipe?
a. its kinetic energy b. its momentum c. its flow rate d. its potential energy
Can an object's velocity change direction when its acceleration is constant? Support your answer with an example
A) No, this is not possible because it is always speeding up. B) No, this is not possible because it is always slowing up. C) No, this is not possible because it is always speeding up or always slowing down, but it can never turn around. D) Yes, this is possible, and a rock thrown straight up is an example. E) Yes, this is possible, and a car that starts from rest, speeds up, slows to a stop, and then backs up is an example.