4. A car carrying a 70 kg driver moving at a speed of 15 m/s is on a dip in the road that approximates the shape of a circle of radius 150m. What is the apparent weight of the driver when the car is at the bottom of the dip? Answer in Newtons. 5. A person is being lowered from a cliff by a rope. I) Is the work done by gravity positive, negative, or zero? il) Is the work done by the tension force positive, negative, or zero? 6. A 8 kg block is being pushed across a rough surface by a person who applies their 40N force at an angle of 30 degrees below the horizontal. The block is moving at a speed of 2 m/s when it passes point A and 3 m/s when it passes point B, which is 4m further along the surface. What is the work doneby the person between A and B? 40N 30 7. How much thermal energy is generated between A and B in the preceding problem? Note that you are not given the coefficient of friction. 8. A ball is thrown straight upward. Consider 5 points during the ball's motion: i) when the ball is in the process of being thrown and is still in contact with the person's hand, li) after the ball has left the person's hand and is rising. Ill) when the ball is at the very top of its path, iv) when the ball is falling and before it is touching the person's hand, and v) while the ball is in the process of being caught and is in contact with the person's hand. For each of these five points, state whether the ball's acceleration is up, down, or zero