A 1500-kg car traveling at 90 km/h toward the east suddenly collides with a 3000-kg car traveling at 60 km/h toward the south. The two cars stick together after the collision. What is the direction of motion of the cars after collision?
A) 53.1° S of E B) 53.1° E of S C) 36.9° E of S D) 36.9° S of E
A
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Which of the following are most massive and luminous?
A) RR Lyrae variables B) brown dwarfs C) Cepheid variables D) T-Tauri variables E) white dwarfs
Four resistors are connected in parallel: the resistance values are 4-ohms, 8-ohms,12-ohms, and 16-ohms: calculate the total circuit resistance
Which of the following is true of the big bang?
A) It was a giant explosion. B) It resulted in galaxies flying away from a center. C) It was a localized event. D) It filled the entire volume of the Universe.
At t = 0 the switch S is closed with the capacitor uncharged. If C = 30 ?F, ? = 30 V, and R = 5.0 k?, at what rate is energy being stored in the capacitor when I = 2.0 mA?
A. 32 mW B. 40 mW C. 44 mW D. 36 mW E. 80 mW