D Question 9 20 pts Drag race tires in contact with an asphalt surface probably have one of the highest coefficients of static friction in the everyday world. Given a car with a mass of 3000kg: o Assuming a constant acceleration and no slipping of tires, what acceleration does the car experience if it covers a quarter mile in 4.0 s? (1 mi = 1609 m) . What is the coefficient of static friction? (Assume the magnitude of the force that accelerates the car is approximately equal to the magnitude of the frictional force between the tires and the road.) . Did you need the mass to calculate the coefficient of friction? Why or why not? 12pt ~ Paragraph ~ |B J U A & T2 vQuestion 8 20 pts Michael pushes on the handle of a 12-kg lawn mower. The force of friction between the mower and the grass is 18 N. The handle makes a 35 angle with the horizontal. Michael wants to accelerate the mower at a rate of 0.5m/s2. What force must he apply along the handle? 12pt v Paragraph B I U A v & V T V VQuestion 13 5 pts A 500 kg weather balloon is designed to lift a 1600 kg package. Remember, Weight = mass * 9.8 and Density = [mass]/[volume of water displaced] 1. What is the total mass of the balloon and the package? 2. What is the weight of the balloon and package together? 3. If the balloon is neutrally buoyant what is the buoyant force on the balloon/package? 4. What is the volume of a helium balloon if the density of helium is 1.2 Kg/L? 12pt V Paragraph B I U AV & V T V VWhen a horse pulls a 69 kg buggy down the road with a force of 41 N, the buggy hitch makes an angle of 25 degrees above the horizontal. If the force of friction on the buggy is 2 N, what is the buggy's acceleration? Report your answer to 2 decimal places. Do not include the units in your answer or the computer will mark the problem wrong. D Question 12 5 pts A hunter shoots a 3 kg bullet at a deer 50 meters away. If the bullet accelerates at 9 x 105 m/sec and the mass of the gun is 2.5 kg, how many newtons of force is exerted on the hunter's shoulder? Report your answer in standard form