A crane lifts a 2500-kg beam using a steel cable whose mass per unit length is 0.650 kg/m. What is the speed of transverse waves on this cable if the upward acceleration of the beam is a steady 3.00 m/s2?
A) 194 m/s
B) 578 m/s
C) 1220 m/s
D) 1880 m/s
E) 222 m/s
E
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The circuit below contains three resistors, A, B, and C, which all have equal resistances. The emf ? = 110V. Which resistor generates the most thermal energy after the switch is closed?
A. A B. B C. C D. A and B E. All three generate equal amounts of thermal energy.
Two ice skaters push off against one another starting from a stationary position. The 45-kg skater acquires a speed of 0.375 m/s. What speed does the 60-kg skater acquire?
A) 0.500 m/s B) 0.281 m/s C) 0.375 m/s D) 0.750 m/s E) 0 m/s
According to the well-known equation E = mc2,
A) mass and energy travel at the speed of light squared. B) energy is actually mass traveling at the speed of light squared. C) mass and energy travel at twice the speed of light. D) mass and energy are related. E) none of the above
The electron
a. is an absolutely stable particle c. has zero mass b. decays via the weak interaction d. is a lepton