Some constants you may want to use... acceleration due to gravity (g) = 9.8 m/s² Coulomb's constant (k) = 8.99 x 10º Nm²/C² charge on a proton or electron 1.6 x 10-19 C Gravitational constant (G) = 6.67 x 10-1' Nm²/kg? 1. A person standing on a horizontal frictionless floor might be able to move by [a] walking [b] crawling slowly [c] throwing a shoe 2. Two charged particles are separated by a certain distance. If the charge of one particle is tripled and the distance remains the same, by what factor does the force between them change? [a] tripled [b] 9 times [c] 1/3 the force 3. A stunt person jumps from a tall building onto a large inflated pad. This is better than hitting the cement because the pad reduces the force of impact since: [a] the interaction time is reduced [c]t [b]the interaction time is increased [d]the change in velocity is increased change in velocity is decreased 4. A bowling ball traveling with a speed v collides with a ping-pong ball moving at the same speed v, but in the opposite direction. One can conclude that the change in momentum of the ping-pong ball is: [a] greater than that of the bowling ball [c] the same as that of the bowling ball [b] less than that of the bowling ball 5. The force on a wire that is in a magnetic field is directed South while the current flows Down (into the page), what is the direction of the magnetic field? [a] North [b] South [c]East [d] West [e] Up [f] Down 6. What is the direction of the force on an electron traveling West through a magnetic field directed North? [a] North [d] West [b] South [c]East [e] Up [f] Down 7. An 80 kg astronaut shoots a 5 kg ball forward in frictionless space at an alien. The ball has less mass than the astronaut. The ball will: [a] continue to move forward while the astronaut goes backward at the same speed as the ball [b] move forward but the astronaut will not change position [c] not move forward, but the astronaut will move backward [d] move forward while the astronaut goes backward at a slower speed than the ball 8. A 0.5 kg hockey puck is traveling to the left at 10 m/s. It is then hit by a stick which causes it to travel left at 10 m/s. What is the magnitude of the impulse on the hockey puck? [a] 0 kg m/s [b] 4 kg m/s [c] 1.2 kg m/s