A proton with mass 1.67 × 10^-27 kg moves with a speed of 0.800c in an accelerator. What is its kinetic energy? (c = 3.00 × 10^8 m/s)
a. 7.52 × 10^-11 J
c. 9.02 × 10^-11 J
b. 1.00 × 10^-10 J
d. 3.76 × 10^-11 J
B
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Helium always has two neutrons in its nucleus
Indicate whether the statement is true or false
Main-sequence stars many times the mass of the Sun produce their energy by the set of nuclear reactions called the CNO cycle
a. True b. False Indicate whether the statement is true or false
If one lawn mower causes an 80-dB sound level at a point nearby, four lawnmowers together would cause a sound level of ____________ at that point
a. 92 dB b. 84 dB c. 86 dB d. none of the above
A particle (mass = 5.0 g, charge = 40 mC) moves in a region of space where the electric field is uniform and is given by Ex = 2.5 N/C, Ey = Ez = 0 . If the velocity of the particle at t = 0 is given by vy = 50 m/s, vx = vz = 0, what is the speed of the particle at t = 2.0 s?
a. 81 m/s b. 72 m/s c. 64 m/s d. 89 m/s e. 25 m/s