Physics

I need help with these questions make sure they are right and explain Thank you!

Part 1

Question 1 (1 point) The area of no return at one intersection was calculated to be 59.0 m. What is the minimum length of time the traffic light should be yellow so a vehicle just entering the area of no return can clear the area while maintaining a speed of 70.0 km/h? 11.9 s 3.03 s 9.10 s 6.07 s Question 2 (1 point) To avoid a potential collision with wildlife crossing the road, the driver of a car travelling 105 km/h fully applies the brakes to stop as quickly as possible. If the car stops 3.8 s after the brakes are applied, what is the braking distance? 95 m 78 m 1.1 102 m 55 mQuestion 3 (1 point) A vehicle comes to a stop 10.0 s after the brakes are applied. While the brakes were applied, the vehicle travelled a distance of 75.0 m. If the vehicle's acceleration remained constant during the braking, what was the vehicle's initial speed? 111 km/h 15.0 km/h 108 km/h 54.0 km/h Question 4 (1 point) Based on a reaction time of 1.50 s and a braking rate of -5.85 m/s, the stopping distance of a vehicle initially travelling 90 km/h would be 90.9 m 75.0 m 37.5 m 53.4 mQuestion 5 (2 points) A group of students are designing a field study to investigate the length of time a traffic light remains yellow. In the interests of safety, one of the students suggested the following rules: Study the traffic lights at intersections where the speed limit is 70 km/h or less. . Avoid rush hour. Study traffic lights outside of times when people are going to and from work and school. Indicate how each of these rules may limit the useful data that comes out of the investigation.Question 1 {2 points) Match each description with the appropriate term listed. a contact force between two surfaces V - that acts to oppose the motion of one surface past the other HEWIDH 2- \"at force | the vector sum of all forces acting on 3- unit 0f force V an object 4. unit of mass Question 2 {1 point) 1. force of friction Which statement correctlyr describes the relationship among acceleration, net force1 and mass? (\"I The magnitude of a vehicle's acceleration increases if the magnitude of the net force increases or if the mass of \\_.z' the vehicle increases. (\"I The magnitude of a vehicle's acceleration increases if the magnitude of the net force increases or if the mass of '\\_.z' the vehicle decreases. (\"I The magnitude of a vehicle's acceleration increases if the magnitude of the net force decreases or if the rttass of '\\_.z' the vehicle decreases. (\"I The magnitude of a vehicle's acceleration increases if the magnitude of the net force decreases or if the rttass of \\_.z' the vehicle increases. Question 3 (1 point) A high-performance car initially travelling 97.2 km/h came to a stop in just 2.9 s. The mass of the car and its contents was 1850 kg. What was the magnitude of the average net force (braking force) on the car while it decelerated? 5.9 10# m 1.8 10# m 4.9 ' 10# m 1.7' 104 m Question 4 (2 points) Explain why the "no zone" in front of a large transport truck is longer when the truck is fully loaded.Question 1 {1 point} The applied force on a vehicle as it increased in speed was +451\") N. The force of friction was 4001] N. The net force on the vehicle was C) +5500 N Q 0500 N O -5500 N C] +3500 N Question 2 [1 point) A vehicle is travelling with uniform velocity along a straight, level stretch of' highway. The combined force due to the rolling friction and air resistance is '5060 N. What is the applied force on the vehicle as it moves?I (:3. +5000 N -5000 N \\. lf_'\\l U N r]. +10 000 N K. Question 3 {1 point) A motorcycle and its rider have a combined mass of 230 kg. The engine generates an applied force of 1001] N[E]. lfthe force of friction opposing the motorcycle is 320 N[W], what is the acceleration of the motorcycle and its rider? C) 534 mfssz] C) 2.95 mfssz] C) 534 mfszf'W] C) 2.95 nszf'i] Question 4 {4 points} A headrest can prevent whiplash injuries during a rearend collision. Use Newton's laws of motion to explain the role of headrests in preventing such injuries. Question 5 [3 points] Some drivers do not wear Their seat belts and do not have air bags in their vehicles. Explain Why head injuries are common for such drivers when the}.r are involved in a frontend collision