**Physics Problem: Traffic Light Dynamics****Problem 4**: You are approaching an intersection and the traffic light is on red.- **Question**: How fast do you need to go to turn it into a green light?Explanation: This problem presents a common scenario encountered at intersections controlled by traffic lights. It asks the reader to consider the speed necessary to encounter a green light rather than a red one. Typically, this type of question involves principles from mechanics and might require knowledge of acceleration, velocity, and the timing of traffic signals. (Note: This is often structured as a thought experiment or a question to understand underlying principles, and not as a recommendation for real driving behavior.)

We will first write the formula of relativistic doppler effect, which relates the true wavelength of…

Answered: 4. You are coming to an intersection…

Similar questions

Bob has just finished climbing a sheer cliff above a level beach and wants to figure out how high he climbed. All he has to use is a baseball, a stopwatch, and a friend on the ground below with a long measuring tape. Bob is a pitcher and knows that the fastest he can throw the ball is about ?0=34.1 m/s.v0=34.1 m/s. Bob starts the stopwatch as he throws the ball, with no way to measure the ball's initial trajectory, and watches carefully. The ball rises and then falls, and after ?1=0.910 st1=0.910 s the ball is once again level with Bob. Bob cannot see well enough to time when the ball hits the ground. Bob's friend then measures that the ball hit the ground ?=123 mx=123 m from the base of the cliff. How high above the beach was the ball when it was thrown?
4. An astronaut is said to have tried to get out of a traffic violation for running a red light ( 650. nm) by telling the judge that the light appeared green ( 540. nm) to her as she passed by in her high-powered transport. If this is true, how fast was the astronaut going?
A physics student measures the depth of a deep hole by dropping a rock into the hole. The rock takes 5 seconds to hit the bottom. Assuming g = 10 m/s2, the depth of the hole is approximately: %3D A. 25 meters B. 50 meters C. 100 meters D. 125 meters E. 200 meters
15. Hello, Can you please help me with the next problem? 15. Two friends talk on the phone to meet,both come out at the same time in their respective bicycles; one of them with a speed of 25 km/h and the other with a speed of 30 Km/h. If the distance that initially separates them is 120 km:1. How far are they from each other's house?2. How long after dating do they meet? Thank you in advance!
A helicopter blade spins at exactly 110 revolutions per minute. Its tip is 9.5 m from the center of rotation. A. What is the average speed of the blade tip in the helicopter's frame of reference, in meters per second? B. What is the average velocity over one revolution, in meters per second?
A search and rescue helicopter travels at constant speed in a horizontal plane. The figure below shows a portion of the path traveled by the helicopter, as viewed looking down from above. The helicopter's path includes three straight portions between points "1" and "2", points "4" and "5", and points "7" and "8", each of which has a length of 4000 m, as shown in the figure. It takes the helicopter 2000 seconds to travel along each of these straight portions of its path. The semi-circular portions of the path (also shown in the figure) have the same radius R=500m. +y YNorth) 8. 4 4000 m A semi-circle is one half of a circle. East 6.
6. A train is moving with a constant speed. The train moves 60 meters for every 1.5 seconds that elapses. a. Assume that we get 40 by dividing 60 by 1.5. What is the name that is commonly given to a quantity represented by this number 40? b. To denote the quantity completely, what additional information must be given besides the number 40? c. How would you interpret the number 40 in this instance? Your answer should mention distance and time. d. Use your interpretation (not algebra) to find the distance the train moves in 2.5 seconds.
David is buying a jet boat this summer and spending a lot of time zooming around. One place he plans on going is to the Plate River above Albany, NY. The current is 4 m/s south and the river is 200m wide. the boat will move at 20 m/s at full throttle, his only setting. A. how quickly will he cross the river if he heads straight across?B. how far downstream will he end up if he does so?C. if he wants to go straight across, what angle upstream should he use?
Two trains are 900.0 kilometers apart. One is in Portland. The other is in San Francisco. They both begin traveling toward each other at the same time. The Portland train travels with an average velocity of 80.0 km/hr South. The San Francisco train travels North with an average velocity of 65.0 km/hr North.a. At what time will the two trains meet?b. How far away will they be from Portland when they meet?
3. How far can you get away from your little brother with a squirt gun filled with ice cold water if you can travel at 3m/s and you have 12 seconds before he sees you?
A car is driving on I-80 traveling at 75 mph. It passes a police officer on the side of the road who is stationary. The moment that the car passes the police officer, the officer accelerates at a constant rate of 20 ft/s2 until she reaches a speed of 80 mph. At that point, her speed is maintained. a. How far does the police car travel before reaching its full speed (in ft)? b. How far does the car travel while the police car is speeding up (in ft)? c. How far does the police car travel before catching up with the car (in ft)?
3. The current in a river moves at 2.0 m/s [S]. How fast and in what direction must a swimmer move through the water in order to have a resultant velocity relative to the river bank of (a) 3.6 m/s[S] (b) 3.6 m/s[N] (c) 3.6 m/s[E]

SEE MORE QUESTIONS

4. You are coming to an intersection and the traffic light is on red. How fast do you need to go to turn it into a green light?