A rocket with a mass of 2.0 × 106 kg is designed to take off from the surface of the earth by burning fuel and ejecting it with an exhaust speed of 3500 m/s
What is the minimum rate at which the fuel should be consumed in order to attain liftoff? A)
5.6 × 103 kg/s
B)
1.4 × 103 kg/s
C)
1.8 × 103 kg/s
D)
2.8 × 103 kg/s
E)
18 × 103 kg/s
A
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What is the wavelength in meters, of a sound wave (v = 340 m/s) with a frequency of 4 Hz?
a. 85 Hz b. 1360 Hz c. 340 Hz d. 0.012 Hz
What are the satellites of the outer planets thought to be composed of?
A. water and carbon dioxide B. ice and rock C. hydrogen and methane D. hydrogen and helium
Iron has an FCC structure at temperatures just above 912°C, and the lattice parameter is 0.3589 nm. Assume that BCC iron’s atomic radius is equal to 0.1241 nm as given in Appendix C, and for carbon it is 0.0077 nm. The atomic radius of iron should not increase with temperature and with changes in crystal structure; only the size of the lattice changes.
(a) Calculate the radius ratio of carbon to iron to see if it is appropriate for octahedral coordination. (b) Calculate diameter of the space available for the octahedral site at the center of the FCC unit cell, and compare this to the diameter of a carbon atom. (c) Comment on the diameter available relative to the diameter of the carbon atom and upon the possibility of solubility of carbon in FCC iron at octahedral interstitial sites. Also comment on the expected relative solubility of carbon in octahedral sites in FCC and BCC iron (see Problem 3.3).
Phase Angles: In the circuit shown in the figure, the 60-Hz ac source has a voltage amplitude of 120 V, the capacitive reactance is 800 ?, the inductive reactance is 300 ?, and the resistance is 560 ?. What is the phase angle?
A. -42° B. +42° C. -69° D. +69° E. -21°