Not good at physics, so could someone check these practice test questions please? Explanations are appreciated.

1. Which of Newton's Laws says you cannot touch anything without being touched?
a) 4th
b) 2nd
c) 1st
d) 3rd ***

2. 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) 7.00 s ***
b) 6.00 s
c) 5.00 s

3. The numbers of significant figures in 6.30 g and 8.030 * 10^3 m are:
a) 2 and 2
b) 3 and 4
c) 2 and 3 ***
d) 4 and 5

4. 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) 8.07 m at 48 degrees Southeast
b) 11.4 m Southeast
c) 3.32 m at 42 degrees Southeast ***
d) 8.07 m at 42 degrees Southeast

1. The correct answer is d) 3rd

Explanation: Newton's 3rd Law of Motion states that for every action, there is an equal and opposite reaction. In other words, if you touch something or exert a force on it, it will also exert a force back on you.

2. The correct answer is a) 7.00 s
Explanation: This problem involves the concept of free fall motion. The vertical motion of the ball can be described using the equation: h = 1/2 * g * t^2, where h is the height, g is the acceleration due to gravity (approximately 9.8 m/s^2), and t is the time. In this case, the initial velocity is zero because the ball is dropped from rest. The time can be found by rearranging the equation to solve for t: t = sqrt(2h/g). Plugging in the values, t = sqrt(2*176.4/9.8) ≈ 7.00 seconds.

3. The correct answer is c) 2 and 3
Explanation: Significant figures are a way to indicate the precision of a number. For 6.30 g, there are 2 significant figures because zeros after a decimal point are considered significant. For 8.030 * 10^3 m, there are 3 significant figures because zeros before a decimal point are not considered significant unless there is a non-zero digit before them.

4. The correct answer is c) 3.32 m at 42 degrees Southeast
Explanation: This problem involves vector addition. The first putt displaces the ball 6.00 m east, and the second putt displaces it 5.4 m south. To find the displacement needed in one putt, we can add these two displacements using vector addition. The resulting displacement can be found using the Pythagorean theorem (a^2 + b^2 = c^2) and trigonometry to determine the angle. In this case, the displacement is approximately 3.32 m and the angle is 42 degrees Southeast.