The cutting cord on a gas-powered weed cutter is 0.20 m in length. If the motor rotates at the rate of 20 rev/s, what is the tangential speed of the end of the cord?
a. 628 m/s
c. 19 m/s
b. 25 m/s
d. 63 m/s
B
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Acceleration: Suppose that a car traveling to the west begins to slow down as it approaches a traffic light. Which of the following statements about its acceleration is correct?
A. The acceleration is toward the east. B. Since the car is slowing down, its acceleration must be negative. C. The acceleration is zero. D. The acceleration is toward the west.
A website's ______ are the methods you will use to achieve your goals.
A. plans B. objectives C. targets D. purposes
What distinguishes quarks from leptons?
A) Quarks interact with one another via the strong force, while leptons do not. B) Quarks are usually found in isolation, while leptons combine to make larger particles. C) Quarks have integer spins, but leptons have half-integer spins. D) Quarks have no charge, while leptons do. E) "Quark" and "lepton" are names for the same type of particle.
The general formula R-X is that of
a. an amine. b. an alkyl halide. c. an alcohol. d. none of these