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 = ?5.5 N/C, Ey = Ez = 0 . If the position and velocity of the particle at t = 0 are given by x = y = z = 0 and vx = 50 m/s, vy = vz = 0, what is the distance from the origin to the particle at t = 2.0 s?
a. 60 m
b. 28 m
c. 44 m
d. 12 m
e. 88 m
d
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In an H-R Diagram, the path showing changes in a star's luminosity and surface temperature as a function of time is called its ________
Fill in the blank(s) with correct word
A weather balloon contains 12.0 m3 of hydrogen gas when the balloon is released from a location at which the temperature is 22.0°C and the pressure is 101 kPa The balloon rises to a location where the temperature is -30.0°C and the pressure is 20.0 kPa. If the balloon is free to expand so that the pressure of the gas inside is equal to the ambient pressure, what is the new volume of the balloon? Assume that in both cases the hydrogen gas is in thermal equilibrium with the outside air.
A) 14.0 m3 B) 2.38 m3 C) 49.9 m3 D) 82.6 m3 E) 4.16 m3
Find the momentum and speed of a proton whose kinetic energy equals its rest energy. (The mass of a proton is 938.3 MeV/c2)
When can we be certain that the average velocity of an object is always equal to its instantaneous velocity?
A) always B) never C) only when the velocity is constant D) only when the acceleration is constant E) only when the acceleration is changing at a constant rate