An electron of mass 9.11 × 10^?31 kg moves with a speed of 0.630c. What is its total energy? (c = 3.00 × 10^8 m/s)
a. 6.37E–14 J
b. 2.36E–14 J
c. 1.63E–14 J
d. 1.06E–13 J
e. 1.01E–13 J
d
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LR Circuits: The series circuit shown in the figure contains an ideal battery with a constant terminal voltage VB = 60 V, an ideal inductor L = 50 H, a resistor R = 11 ohm resistor, and a switch S. Initially, the switch is open, and there is no current in the inductor. At time t = 0 s, the switch is suddenly closed. What is the current in the circuit 4.09 s after closing the switch?
A. 3.2 A B. 2.7 A C. 2.2 A D. 4.3 A E. 5.5 A
Which of the following statements about the disk of the Milky Way is false?
A) The average age of disk stars is less than that of halo stars. B) Disk stars are all younger than 5 billion years. C) Disk stars have a higher proportion of heavy elements, on average, than halo stars. D) Disk stars orbit in the same direction around the Galactic center. E) The length of the disk is about 100 times its thickness.
Momentum is defined as
A) mass times speed. B) mass times velocity. C) force times velocity. D) mass times acceleration. E) force times acceleration.
What types of events ended the Paleozoic era?
What will be an ideal response?