A crane lifts a 2500-kg beam at a steady rate of 15 cm/s using a steel cable whose mass per unit length is 0.65 kg/m. What is the speed of transverse waves on this cable?
A) 230 m/s
B) 580 m/s
C) 1200 m/s
D) 1900 m/s
E) 190 m/s
E
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The charge per unit length on an insulator is 6.2 ?C/m. On a 2.0-m length of this material, what is the difference in the number of electrons and the number of protons?
a. There are 7.8 × 10^13 more electrons than protons. b. There are 7.8 × 10^13 more protons than electrons. c. There are 3.9 × 10^13 more protons than electrons. d. There are 3.9 × 10^13 more electrons than protons.
The Fermi temperature is
a. a characteristic temperature of an electron gas at a physical temperature of absolute zero. b. a characteristic temperature of an electron gas at a physical temperature of 0° Celsius. c. the temperature of the electron gas in absolute degrees. d. related to the Fermi energy by the relation EF = (3/2) kT. e. independent of the Fermi energy.
The phase of the Moon that one observes on the overhead meridian at 10 P.M. local time is a ______________ moon
a. waxing crescent b. waning crescent c. waxing gibbous d. waning gibbous
A car is initially moving at 20 m/s east, and a little while later it is moving at 10 m/s north. Which of the following best describes the orientation of the average acceleration during this time interval?
a. northeast b. northwest c. west d. north of west