When they are far apart, the momentum of a proton is <3.4 × 10^(-21), 0, 0> kg·m/s as it approaches another proton that is initially at rest. The two protons repel each other electrically, without coming close enough to touch. When they are once again far apart, one of the protons now has momentum <2.7 × 10^(-21), 1.3 × 10^(-21), 0> kg·m/s.
At that instant, what is the momentum of the other proton? (Express your answer in vector form.)

Which of the following is considered to be a vector?               a.  temperature    b.  velocity    c.  time    d.  mass

The x-coordinate of a particle in curvilinear motion is given by x = 3.1t3 - 4.9t where x is in feet and t is in seconds. the y-component of acceleration in feet per second squared is given by ay = 2.3t. if the particle has y-components y = 0 and vy = 5.0 ft/sec when t = 0, find the magnitudes of the velocity v and acceleration a when t = 1.8 sec. sketch the path for the first 1.8 seconds of motion, and show the velocity and acceleration vectors for t = 1.8 sec. answers: v = ft/sec a = ft/sec2

Which one of the following terms is used to indicate the natural tendency of an object to remain at rest or in motion at a constant speed along a straight line? velocity acceleration equilibrium force inertia