A car moving at a constant speed goes around a curve of 400-ft radius and then goes around a second curve of 200-ft radius. The centripetal force acting on the car as it goes around the 200-ft radius curve is ___________ the value of the centripetal force acting on the car as it goes around the 400-ft radius curve
a. one quarter
b. one half
c. the same as
d. twice
e. four times
d
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A child is drinking a liquid with a straw. Which of the following statements is true?
A. Longer straws work better because the pressure is larger deeper down B. The fluid is being pulled up into the straw C. The pressure inside the straw depends on the viscosity of the liquid D. The pressure in the straw is reduced and the liquid is pushed upward by atmospheric pressure on the surface of the liquid
A wheel rotates about a fixed axis with an initial angular velocity of 20 rad/s. During a 5.0-s interval the angular velocity increases to 40 rad/s. Assume that the angular acceleration was constant during the 5.0-s interval. How many revolutions does the wheel turn through during the 5.0-s interval?
A. 20 rev B. 24 rev C. 32 rev D. 28 rev E. 39 rev
A thick-walled metal pipe of length 20 cm has an inside diameter of 2.0 cm and an outside diameter of 2.4 cm. What is the total surface area of the pipe, counting the ends?
What will be an ideal response?
Light of wavelength 450 nm shines on a soap bubble film (n = 1.46). For what soap film thickness, other than the minimum thickness, will constructive interference occur?
a. 771 nm b. 154 nm c. 493 nm d. 231 nm e. 462 nm