The position of an air-track cart that is oscillating on a spring is given by x = (12.4 cm) cos[(6.35 s-1)t]. At what value of t after t = 0 s is the cart first located at x = 8.47 cm?
A) 4.34 s
B) 0.108 s
C) 0.129 s
D) 7.39 s
E) 7.75 s
C
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You walk barefoot in your house and cross from the carpeted living room to the tiled-floor kitchen. The tile floor always feels
A) cooler than the carpet. B) the same temperature as the carpet. C) warmer than the carpet. D) warmer than the carpet in summer but cooler in winter. E) cooler than the carpet in summer but warmer in winter.
A slit of width 2.0 ?m is used in a single slit experiment with light of wavelength 650 nm. If the intensity at the central maximum is Io, what is the intensity 10° from the center?
A) 0.53 Io B) 0.03 Io C) 0.43 Io D) 0.50 Io E) 0.35 Io
A uniform rod of length (L = 2.0 m) and mass (M = 1.5 kg) is pivoted about a horizontal frictionless pin through one end. The rod is released from rest at an angle of 30° below the horizontal. What is the angular speed of the rod when it passes through the vertical position? (The rotational inertia of the rod about the pin is 2.0 kg?m2.)
A. 3.5 rad/s B. 2.7 rad/s C. 3.1 rad/s D. 2.3 rad/s E. 1.6 rad/s
Scientific models supported by a large, compelling body of evidence are referred to as
A) facts B) ideas C) theories D) hypotheses