Author Question: A firecracker breaks up into two pieces, one of which has a mass of 200 g and flies off along the ... (Read 43 times)

yoroshambo · **on:** Jul 29, 2018

A firecracker breaks up into two pieces, one of which has a mass of 200 g and flies off along the +x-axis with a speed of 82.0 m/s. The second piece has a mass of 300 g and flies off along the +y-axis with a speed of 45.0 m/s.

What is the total momentum of the two pieces? A) 361 kg m/s at 56.3 from the +x-axis
B) 93.5 kg m/s at 28.8 from the +x-axis
C) 21.2 kg m/s at 39.5 from the +x-axis
D) 361 kg m/s at 0.983 from the +x-axis
E) 21.2 kg m/s at 56.3 from the +x-axis

Question 2

An electron has a relativistic momentum of 1.1 10-21 kg m/s. What percent of its total energy is its kinetic energy?

(melectron = 9.11 10-31 kg, c = 3.0 108 m/s)