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? Question 29 options: 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

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? Question 29 options: 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

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Description: 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? Question 29 options: The amount of tim

Principles of Physics: A Calculus-Based Text

5th Edition

ISBN:9781133104261

Author:Raymond A. Serway, John W. Jewett

Publisher:Raymond A. Serway, John W. Jewett

Chapter2: Motion In One Dimension

Section: Chapter Questions

Problem 41P: Colonel John P. Stapp, USAF, participated in studying whether a jet pilot could survive emergency...

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Colonel John P. Stapp, USAF, participated in studying whether a jet pilot could survive emergency ejection. On March 19, 1954, he rode a rocket-propelled sled that moved down a track at a speed of 632 mi/h. He and the sled were safely brought to rest in 1.40 s (Fig. P2.41). Determine (a) the negative acceleration he experienced and (b) the distance he traveled during this negative acceleration.
To pass a physical education class at a university, a student must run 1.0 mi in 12 min. After running for 10 min, she still has 500 yd to go. If her maximum acceleration is 0.15 m/s2, can she make it? If the answer is no, determine what acceleration she would need to be successful.
As an object moves along the x axis, many measurements are made of its position, enough to generate a smooth, accurate graph of x versus t. Which of the following quantities for the object cannot be obtained from this graph alone? (a) the velocity at any instant (b) the acceleration at any instant (c) the displacement during some time interval (d) the average velocity during some time interval (e) the speed at any instant
Colonel John P. Stapp, USAF, participated in studying whether a jet pilot could survive emergency ejection. On March 19, 1954, he rode a rocket-propelled sled that moved down a track at a speed of 632 mi/h (see figure below). He and the sled were safely brought to rest in 1.40 s. (a) Determine in SI units the negative acceleration he experienced. (m/s2) (b) Determine in SI units the distance he traveled during this negative acceleration. (m)
One of the most difficult things to learn in physics is that our everyday language is not always precise enough. For instance, we might say a car is “slowing down”, but that only gives us information abouts velocity, not its acceleration. What can we say about the velocity of a car which has negative acceleration in the x-direction? a. It is slowing down. b. The x-component of its velocity is decreasing. c. The x-component of its velocity is negative. d. It is speeding up. e. The x-component of its velocity is positive. f. The x-component of its velocity is increasing.
A European sports car dealer claims that his product will accelerate at a constant rate from rest to a speed of 100 km/hr in 8.00 s. What is the speed after the first 4.00 s of acceleration? (Hint: First convert the speed to m/s.)
The cheetah is considered the fastest running animal in the world. Cheetahs can accelerate to a speed of 21.8 m/s in 2.50 s and can continue to accelerate to reach a top speed of 28.8 m/s. Assume the acceleration is constant until the top speed is reached and is zero thereafter. 1) Express the cheetah's top speed in mi/h. (Express your answer to three significant figures.) answer: 64.2 2) Starting from a crouched position, how long does it take a cheetah to reach its top speed? (Express your answer to three significant figures.) answer: 3.31 3) How far does it travel in that time? (Express your answer to three significant figures.) answer: 47.5 4) If a cheetah sees a rabbit 120 m away, how long will it take to reach the rabbit, assuming the rabbit does not move? (Express your answer to three significant figures.) answer: ? tried 5.25 and 5.26 but does not work
A racing car starts from rest and reaches a final speed v in a time t. If the acceleration of the car is constant during this time, which of the following statements must be true? (a) The car travels a distance vt. (b) The average speed of the car is v/2. (c) The acceleration of the car is v/t. (d) The velocity of the car remains constant. (e) None of these.
Answer the following questions with the correct letter. 1. A box was dropped from the top of a building. Which of the following is true regarding its velocity? a. The velocity increases. b. The velocity stays the same. c. The velocity decreases. d. I need more details to confirm any of these three statements. 2. A box was dropped from the top of a building. Which of the following is true regarding its acceleration? a. The acceleration increases. b. The acceleration stays the same. c. The acceleration decreases. d. I need more details to confirm any of these three statements. 3. A rock is thrown vertically into the air. At the top of its path, its acceleration is <blank>. a. Zero b. 9.8 meters per second squared c. Between 0 and 9.8 meters per second squared d. Greater than 9.8 meters per second squared 4. Which law has this statement? “An object either remains at rest or continues to move at a constant velocity, unless acted upon by a net force”. a. First Law b. Second…
(the complete question is in the picture) Which of the following best describes an instantaneous speed?A. A marathon runner stopping midway to take a break.B. A runner finishing a 1-km runaround an oval track in 30 [s]C. A traveler walking for 30 [min]D. A typhoon going southeast with130 [km/h] wind speed.
1.A sprinter runs 500 m sprint for 44.2 seconds. What is his average speed? Calculate answer to one decimal. 2.How far does a car going 22 m/s travel in 22.7 min. Give answer in meters. Calculate answer to one decimal 3.Initially stationary, a train has a constant acceleration of 0.3 m/s What is its speed after 12.6s. Calculate answer to one decimal . 4.Initially stationary, a train has a constant acceleration of 1.3 m/s How far it travel after 21.6s. Calculate answer to one decimal . 5.A Skydiver jumps out of a helicopter and falls freely for 0.6s before opening the parachute. What is the skydiver's downward velocity when the parachute opens? Use g = 9.8 m/s ^ 2 Calculate answer to one decimal 6. During takeoffan airplane goes from 0 52 m/s is 5 s. What is its acceleration? Calculate answer to one decimal 7.During takeoffan airplane goes from 0 to 50 m/s is 75. How far is it going after . Calculate answer to one decimal.
Hicham El Guerrouj of Morocco holds the world record in the 1500 m running race. He ran the final 400 m in a time of 51.9 s. What was his average speed in mph over the last 400 m?A. 14.2 mph B. 15.5 mphC. 17.2 mph D. 23.9 mph

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	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 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 not distracted is about 2 seconds.