Which types of galaxies have a clearly defined disk component?
A) spirals only
B) ellipticals only
C) lenticulars only
D) irregulars only
E) spirals and lenticulars
E
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A drive shaft resists torsional shear stress of 45 MPa and axial com-pressive stress of 100 MPa. The ratio of the magnitudes of the principal stresses (?1/?2) is approximately:
(A) 0.15
(B) 0.55
(C) 1.2
(D) 1.9
If a 10-V battery, with negligible internal resistance, and a 15-? resistor are connected in series, what is the amount of electrical energy transformed to heat per coulomb of charge that flows through the circuit?
a. 0.67 J b. 1.5 J c. 10 J d. 150 J e. 25 J
Two blocks, joined by a string, have masses of 6.0 and 9.0 kg. They rest on a frictionless, horizontal surface. A second string, attached only to the 6.0-kg block, has horizontal force = 45 N applied to it. Both blocks accelerate. Find the tension in the string between the blocks
a. 18 N c. 12 N b. 27 N d. 9.0 N
An electron in a hydrogen atom makes a transition from the n = 4 to the n = 3 energy state. Determine the energy (in eV) of the emitted photon
a. 0.54 b. 0.66 c. 0.85 d. 1.51 e. 10.2