A bridge is made with segments of concrete 50 m long. If the linear expansion coefficient is 12 × 10^?6 (°C)?1, how much spacing (in cm) is needed to allow for expansion during an extreme temperature change of 150° F?
a. 10
b. 2.5
c. 7.5
d. 5.0
e. 9.5
d
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Energy Conservation With Conservative Forces: A lightweight object and a very heavy object are sliding with equal speeds along a level frictionless surface. They both slide up the same frictionless hill with no air resistance. Which object rises to a greater height?
A. The heavy object, because it has greater initial kinetic energy. B. The light object, because gravity slows it down less. C. The lightweight object, because the force of gravity on it is less. D. The heavy object, because it has more mass to carry it up the hill. E. They both slide to exactly the same height.
A single slit forms a diffraction pattern with monochromatic light. The fourth minimum of the pattern occurs at an angle of 32° from the central maximum. The angle at which the fifth minimum of the pattern occurs is closest to:
A) 41.5° B) 41.0° C) 40.5° D) 42.0° E) 42.5°
If the electric field just outside a thin conducting sheet is equal to 1.5 N/C, determine the surface charge density on the conductor
a. 53 pC/m2 b. 27 pC/m2 c. 35 pC/m2 d. 13 pC/m2 e. 6.6 pC/m2
Which of the following observational techniques is most appropriate for measuring Doppler shifts?
A) spectroscopy (taking a spectrum) B) imaging (taking a picture) C) timing (measuring how the amount of light changes with time)