If a beam of radiation has an intensity of 120 W/m2, what is the maximum value of E?
A)
1.5 × 103 V/m
B)
0.000001 T
C)
1.0 × 10-6 V/m
D)
3.0 × 102 V/m
E)
3.2 × 10-3 V/m
D
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The wavelengths of the sounds produced by two horns are 6.0 m and 7.0 m, respectively. What beat frequency is heard when the horns are sounded on a day when the speed of sound is 340 m/s?
A) 5 Hz B) 6 Hz C) 7 Hz D) 8 Hz
Jerome pitches a baseball of mass 0.15 kg. The ball arrives at home plate with a speed of 40 m/s and is batted straight back to Jerome with a return speed of 60 m/s. What is the magnitude of change in the ball's momentum?
a. 4.0 kgm/s c. 15 kgm/s b. 8.0 kgm/s d. 20 kgm/s
The position of a mass that is oscillating on a spring is given by x = (12.3 cm) cos[(1.26s-1)t]. What is the velocity of the mass when t = 0.815 s?
A) - 13.3 cm/s B) 13.3 cm/s C) 8.02 cm/s D) - 8.02 cm/s E) 0 cm/s
Consider 2 LRC circuits at critical damping. In which circuit does the initial charge on the capacitor decrease to 10% of its value the fastest?
A) in the circuit with the smallest initial charge on the capacitor B) in the circuit with the largest resistance C) in the circuit with the largest LC product D) in the circuit with the smallest LC product E) in the circuit with the largest initial charge on the capacitor