Consider the so-called "2-second rule" that is used as a recommendation when teaching safe driving skills. Which of the following is true regarding the physical principles that support the use of this guideline? The amount of time to slow down your car when braking is equal to 2 seconds regardless of the speed. The reaction time of most drivers who are not distracted is about 2 seconds. The amount of time to safely pass a vehicle that stops suddenly in front of you is equal to 2 seconds regardless of the speed. The reaction time of most drivers who are distracted is about 2 seconds.
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- A car starts from rest. It accelerates at constant acceleration for 5.0 seconds during which the car covers a distance of 125 m. After that the car continues at that speed for 22 seconds, after which the car slows down at a constant deceleration of – 4.5 m/sec2 until coming to a complete stop. Draw a v vs t, graph, label all the relevant data, and use the graphical method to determine total distance traveled.A person jogs three complete laps around a 200 m track in a total time of 11 minutes. What is the jogger's average velocity in m/s. 0 m/s 3.7 m/s 21.4 m/s 37 0.91A driver is driving uphill. He maintained his throttle, causing his car to constantly decelerate as it is coming up the hill. The road going up the hill is 217 m long and it took him 8.8 seconds to get to the top of the hill. His speed has reduced to 22 m/s at that point. What was the car's acceleration (include a negative sign in your answer)? Hint: the initial position of the car can be set at the origin.
- ACTIVITY 3: GRAPHICAL ANALYSIS OF MOTION Directions: The velocity of a moving object was noted at the given time intervals. (A) Construct a velocity-versus-time graph. (B) Characterize the motion of the body for each portion of its trip. (Č) Determine the acceleration and displacement for each portion. (D) Find the total displacement as well as the total distance of the body from its starting position. (E) Draw the corresponding acceleration-versus-time graph. Position Velocity (m/s) Time (s) A B 20 10 C 20 30 D 40 E 50 F -20 60 G -20 80 H 90Fast Car: On a hot day in the flats, the temperature is 103.6 degrees. A driver finds an empty, flat stretch of desert that is 1776 meters long and decides to push the limits of his car. He finds the car can accelerate from 0 to 60 mph (26.8 m/s) in 4.30 s. Now he wants to see how fast the car can go. Assume the car maintains the same average acceleration until it reaches its top speed of 84.8 m/s. (a) How long will it take the car to reach its top speed? (b) How far will the car travel before it reaches its top speed?You are driving in a car with your friend, who is speeding around the corner of a highway. You are worried for your safety, so you ask your friend how fast they are going. Your friend responds, "I am going around this corner at a constant velocity of 65 mph." Is their statement physically correct? A) It might make sense, depending on extra information which is not being given in the problem? B) Yes, this statement is acceptable. C) No, the word "velocity" is being used incorrectly. D) No, cars always slow down as they go around corners.
- A cockroach is running across the floor at a velocity of 1.5 cm/s trying to find some Takis (that a physics student spilled). All of a sudden it sees a student coming to step on it so it stops. This all occurred in 0.5 seconds. What was the cockroach’s rate of acceleration?Rocket-powered sleds are been used to test the responses of humans to acceleration. Starting from rest, one sled can reach a speed of 510 m/s in 2.37 s and can be brought to a stop again in 3.15 s. Find the acceleration of the sled while accelerating. Answer in units of m/s2. Find the acceleration of the sled when braking. Answer in units of m/s2.On a hot day in the flats, the temperature is 100.9 degrees. A driver finds an empty, flat stretch of desert that is 1575 meters long and decides to push the limits of his car. He finds the car can accelerate from 0 to 60 mph (26.8 m/s) in 4.21 s. Now he wants to see how fast the car can go. Assume the car maintains the same average acceleration until it reaches its top speed of 69.1 m/s. (a) How long will it take the car to reach its top speed? (b) How far will the car travel before it reaches its top speed?
- A boxer's fist and glove have a mass of m = 1.04 kg. The boxer's fist can obtain a speed of v = 9.25 m/s in a time of t = 0.21 s. Write a symbolic expression for the magnitude of the average acceleration, aave, of the boxer's fist, in terms of the variables provided. Find the magnitude of the average acceleration, aave, in meters per square second. Write an expression for the magnitude of the average net force, Fb, that the boxer must apply to his fist to achieve the given velocity. (Write the expression in terms of m, v and t.) What is the numerical value of Fb, in newtons?You and your family are going on a road trip to visit your recently married cousin in B.C. The total round trip distance is 2100 km. On the way to B.C., you encounter no setbacks and you are able to drive on average at a constant speed. On the way home from B.C., you encounter a snowstorm and your mom has to slow down to avoid getting into an accident. Thus, your average speed decreases by 10 km/h. If the total driving time was 42 hours, what was your average speed on the way to B.C.? Recall distance = speed x time.The figure below shows a graph of v, versus t for the motion of a motorcyclist as he starts from rest and moves along the road in a straight line. v. (m/s) 10 8. 6 2 t (s) 12 4. 8 10 (a) Find the average acceleration for the time interval t = 0 to t = 12.0 s. 0.3 V m/s2 (b) Estimate the time at which the acceleration has its greatest positive value. 3 What is the value of the acceleration at that instant? 0.2 Your response is off by a multiple of ten. m/s2 (c) When is the acceleration zero? Acceleration is zero whent = 0 The correct answer is not zero. s and when t > 0 The correct answer is not zero. s.