What is the mass in mev and in kg (both to decimal places) of an electron whose speed is half the speed of light? mass in mey- mass in kg- b. what is the momentum of this electron, in kg. s-. and in mev (both in 3 decimal places)? momentum of this electron, in kg·s-1= momentum in mev/c c. what would be the energy (in ey) of a photon with the same speed energy of photon in ev-

Arunner is jogging at a steady 3.6 km/hr. when the runner is 2.9 km from the finish line, a bird begins flying from the runner to the finish line at 14.4 km/hr (4 times as fast as the runner). when the bird reaches the finish line, it turns around and flies back to the runner. even though the bird is a dodo, we will assume that it occupies only one point in space, i.e., a zero-length bird. how far does the bird travel? (b) after this first encounter, the bird then turns around and flies from the runner back to the finish line, turns around again and flies back to the runner. the bird repeats the back and forth trips until the runner reaches the finish line. how far does the bird travel from the beginning? (i.e. include the distance traveled to the first encounter)