When a car goes around a curve of smaller and smaller radius, the centripetal force on it decreases
Indicate whether the statement is true or false
F
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As an artificial radio source, the spinning Earth would have a period of about a day
Indicate whether the statement is true or false
Can an object's velocity change direction when its acceleration is constant?
A) Yes, this is possible, and a rock thrown straight up is an example. B) No, this is not possible because it is always speeding up. C) No, this is not possible because it is always slowing up. D) Yes, this is possible, and a car that starts from rest, speeds up, slows to a stop, and then backs up is an example. E) No, this is not possible because it is always speeding up or always slowing down, but it can never turn around.
Three resistors with values R1, R2 and R3, respectively, are connected in parallel. Which of the following expresses the total resistance, RT, of the three resistors when connected in parallel?
a. RT = R1 + R2 + R3 b. RT = (1/R1 + 1/R2 + 1/R3) c. RT = R1 = R2 = R3 d. RT = (1/R1 + 1/R2 + 1/R3)?1
If a supersonic plane is flying at increasing speed as the temperature decreases, what happens to the Mach number in this instance?
a. It stays the same. b. It increases. c. It decreases. d. It can do any of the above. e. It can do either (a) or (b) but not (c).