An object moving at a relativistic speed past a stationary observer appears to
A. have length expanded and have a slower clock.
B. have length contracted and have a slower clock.
C. have length expanded and have a faster clock.
D. have length contracted and have a faster clock.
E. be completely normal.
Answer: B
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A simply supported steel beam of length L 5 1.5 m and rectangu-lar cross section (h 5 75 mm, b 5 20 mm) carries a uniform load of q 5 48 kN/m that includes its own weight. The maximum transverse shear stress on the cross section at 0.25 m from the left support is approx-imately:
(A) 20 MPa
(B) 24 MPa
(C) 30 MPa
(D) 36 MPa
Conversion of Units: Your car gets 34.7 mi/gal on a vacation trip in the U.S. If you were figuring your mileage in Europe, how many km/L did it get? (3.79 L = 1.00 gal; 1.00 mi = 1.61 km)
A. 14.7 km/L B. 9.16 km/L C. 55.9 km/L D. 32.4 km/L
Which is the first postulate of Bohr's model of the atom?
a. The angular momentum of the electron is quantized. b. Light is quantized. c. An electron radiates while it remains in an allowed orbit. d. An electron is not in a precise orbit. e. A photon is emitted whenever an electron jumps up one orbit.
Why is continental crust lower in density than seafloor crust?
A) Continental crust is made of rock, while seafloor crust has more metals. B) Continental crust is made from volcanic rock called basalt, which is lower in density than what the seafloor crust is made from. C) Continental crust is made from remelted seafloor crust and therefore only the lower-density material rises to form it. D) Continental crust is actually denser than seafloor crust. E) Seafloor crust is more compact due to the weight of the oceans, but it is made of the same material as the continental crust.