Please check these over and see if any are incorrect?
1. The units of speed are:
a) m/s ---> my answer
b) m/s^2 and direction
c) N
d) m/s and direction
2. Which of Newton's Laws says you cannot touch anything without being touched?
a) 4th
b) 2nd
c) 1st
d) 3rd ---> my answer
3. A golfer takes two putts to sink a ball in the hole. The first putt displaces the ball 6.00 m east, and the second putt displaces the ball 5.4 m south. What displacement would put the ball in the hole in one putt?
a) 3.32 m at 42 degrees SE
b) 8.07 m at 48 degrees SE ---> my answer
c)11.4 m southeast
d) 8.07 m at 42 degrees SE
4. We're comparing two vectors, A and B. If one of the components of A along the direction of B is zero, what can you conclude about these two vectors?
a) they are parallel
b) they are identical ---> my answer
c) they are perpendicular
5. A 3.00 kg ball is dropped from rest from the roof of a building 176.4 m high. while the ball is falling, a horizontal wind exerts a constant force of 12.0 N on the ball. How long until the ball hits the ground?
a) 5.00 s
b) 6.00 s
c) 7.00 s ---> my answer
6. The minimum velocity of a projectile thrown at an angle, theta, occurs:
a) at the top of the path
b) as it nears the ground
c) as the ball is launched ---> my answer
7. A ball is left on the bed of a pick up truck. When the truck accelerates forward, the ball:
a) stays put
b) moves toward the back of the truck ---> my answer
c) moves forward in the motion of the truck