Chapter 2, Problem 41P

A car is moving towards the left, which is the negative X direction. It travels 49.2 m during a 7.83-s time interval.  What is the value of the X component of the car’s average velocity, in meters per second, during the given time interval?

Speedy Sue, driving at 32.0 m/s, enters a one-lane tunnel. She then observes a slow-moving van 175 m ahead traveling at 5.30 m/s. Sue applies her brakes but can accelerate only at −1.10 m/s2 because the road is wet. Will there be a collision?   If yes, determine how far into the tunnel and at what time the collision occurs. If no, determine the distance of closest approach between Sue's car and the van. (If no, enter "0" for the time.)

There are flies that are flying with a constant altitude of 5 km, that has a velocity of 42km/h. At time t=0 the fly passes directly above a radar station, where t is measured in hours.  a) how fast is the distance between the fly and the radar station changing after ten minutes? provide units and 2 decimal places.  b) how fast is the distance between the bird and the radar station changing at time t=0; when the fly is directly above the radar station? Would it be reasonable, explain?

Speedy Sue, driving at 32.0 m/s, enters a one-lane tunnel. She then observes a slow-moving van 165 m ahead traveling at 5.10 m/s. Sue applies her brakes but can accelerate only at −1.30 m/s2 because the road is wet. Will there be a collision? Yes or No     If yes, determine how far into the tunnel and at what time the collision occurs. If no, determine the distance of closest approach between Sue's car and the van. (If no, enter "0" for the time.) distance      ?m time      ?s

A runner with a good awareness of her pace runs along a path of unknown length at a speed of 0.275 mi/min and then walks back to her starting point at a speed of 0.0500 mi/min. She neglects to note her time for each part of her path, but does measure the total round trip time to be 60.0 min. How far did she run? Do not include the walking distance

You are driving a car along a straight road at 122 kph. Suddenly, you saw a cat crossing the road and you apply the brakes decelerating the car at a constant rate of -44 m/s^2. If your reaction time is 1.50 seconds, what is the shortest stopping distance from the moment you see the cat? Illustrate the problem.

Speedy Sue, driving at 30.0 m/s, enters a one-lane tunnel. She then observes a slow-moving van 155 m ahead traveling at 5.00 m/s. Sue applies her brakes but can accelerate only at −2.00 m/s2 because the road is wet. Will there be a collision? State how you decide. If yes, determine how far into the tunnel and at what time the collision occurs. If no, determine the distance of closest approach between Sue’s car and the van.

Car B is traveling a distance d ahead of car A. Both cars are travelling at 60 ft/s when the driver of B suddenly applies the brakes, causing his car to decelerate at 12 ft/s^2. It takes the driver of Car A 0.75 seconds to react (this is the normal reaction time for drivers). When he applies his brakes, he decelerates at 15 ft/s^2. Determine the minimum distance d between the cars so as to avoid a collision. a. 15.0 ft b. 20.3 ft c. 16.9 ft d. 12.1 ft

The velocity of a particle is given by v = 23t2 - 110t + 52, where v is in meters per second and t is in seconds. Plot the velocity v and acceleration a versus time for the first 6.4 seconds of motion and evaluate the velocity when a is zero. Make the plots and then answer the questions. Questions: When t = 0.8 s, V = i m/s, a = i m/s2 When t = 3.7 s, V = i m/s, a = i m/s? When t = 4.7 s, V = i m/s, a = i m/s? When a = 0, V = m/s