5. A child in a school crossing ran into the street and was struck by a car, despite the driver skidding to a stop. Fortunately, the child was not seriously injured. The driver reported that he was driving the car at only 30 km/h. Using the formula V= 12.6√d+8, where the length of the skid marks d is in metres and the velocity v is in km/h, calculate the expected length of the skid marks if the velocity was actually 30 km/h. Make sure to record your answer to two decimal places.

5. A child in a school crossing ran into the street and was struck by a car, despite the driver skidding to a stop. Fortunately, the child was not seriously injured. The driver reported that he was driving the car at only 30 km/h. Using the formula V= 12.6√d+8, where the length of the skid marks d is in metres and the velocity v is in km/h, calculate the expected length of the skid marks if the velocity was actually 30 km/h. Make sure to record your answer to two decimal places.

Structural Analysis

6th Edition

ISBN:9781337630931

Author:KASSIMALI, Aslam.

Publisher:KASSIMALI, Aslam.

Chapter2: Loads On Structures

Section: Chapter Questions

Problem 1P

See similar textbooks

Similar questions

A Circular Roadway and the Acceleration of Your Car "T (decreasing) (a) Constant angular speed (b) Decreasing angular speed Suppose you are driving a car in a counterclockwise direction on a circular road whose radius is r= 390 m (see Figure 8.20). You look at the speedometer and it reads a steady 32 m/s (about 72 mi/h). (a) What is the angular speed of the car? (b) Determine the acceleration (magnitude and direction) of the car. (c) To avoid a rear-end collision with a vehicle ahead, you apply the brakes and reduce your angular speed to 4.9 x 10-2 rad/s in a time of 4.0 s. What is the tangential acceleration (magnitude and direction) of the car?
An electric car is subjected to acceleration tests along a straight and level test track. The resulting v-t data are closely modeled over the first 10 seconds by the function v = 24t-² +5+¹/2, where t is the time in seconds and vis the velocity in feet per second. Determine the displacements as a function of time over the interval 0 st≤ 10 sec and specify its value at the indicated times. 1, ft/sec 160p 140 120 100 80 60 40 20 0 Answer: At t = 2 sec, 2 At t = 4.6 sec, At t = 9.4 sec. S= t, soc i S= i S= i At t= 10.0 sec, s= i 6 8 10 ft ft ft ft
A football player releases a ball with the initial conditions shown in the figure. Determine the radius of curvature of the trajectory at times t- 1.2 sec andt- 2.5 sec, where t- 0 is the time of release from the quarterback's hand. For each case, compute the time rate of change of the speed. 86 ft/sec = 40 Answers: For t- 1.2 sec, p- i ft. v = ft/sec2 For t- 2.5 sec, p- i ft, v = i ft/sec?
A car moves in a straight line with a velocity of v = (3t2-7t) m/s, and t is in seconds. Determine its position in meters at t = 5s if when t=0, x=0.
Problem 12: The sports car is traveling along a 30° banked road having a radius of curvature of p = 1000 ft. If the coefficient of static friction between the tires and the road is u= 0.2, determine the minimum safe speed so no slipping (slipping down) occurs. Neglect the size of the car. 300
When crossing an intersection, a motorcyclist encounters the slight bump or crown caused by the intersecting road. If the crest of the bump has a radius of curvature r = 58.06 ft, determine the maximum constant speed in ft/s at which he can travel without leaving the surface of the road. Neglect the size of the motorcycle and rider in the calculation. The rider and his motorcycle have a total weight of 440 Ib.
How long does it take for the truck to reach 16.80 m ? The truck travels along a circular road that has a radius of 50 m at a speed of 5 m/s. For a short distance when t = 0, its speed is then increased by af = (0.4t) m/s², where t is in seconds.(Figure 1) vec t = Submit Request Answer Part B Determine the speed of the truck when has traveled 16.80 m . Express your answer with the appropriate units. Figure 1 of 1 µA Value |m/s V = Submit Request Answer Part C 50 m Determine the magnitude of the truck's acceleration when has traveled 16.80 m . Express your answer with the appropriate units.
Car A starts from rest at t = 0 and travels along a straight road with a constant acceleration of 6 ft/s^2 until it reaches a speed of 80 ft/s. Afterwards it maintains this speed. Also, when t = 0, car B located 6000 ft down the road is traveling towards A at a constant speed of 60 ft/s. Determine the distance traveled by car A when they pass each other.
10. Person A is 4 km south and 6 km west of person B. Person A walks north at a speed of 1 km/h. Person B walks east at a speed of 2 km/h. If they both start at 12:30:00, determine the closest distance they will ever be from each other. Create a new diagram that will support your opening equation. 4 km A 6 km B
NOTE: This is a multi-part question. Once an answer is submitted, you will be unable to return to this part. Three seconds after automobile B passes through the intersection shown, automobile A passes through the same intersection. Given, the speed of automobile A is VA = 55.00 mi/h and automobile B is vg= 34.00 mi/h, respectively. Also, know that the speeds are constant for the automobiles during the encounter. N 70° S + VA vB Determine the distance between the two automobiles 2 s after A has passed through the intersection. The distance between the two automobiles 2 s after A has passed through the intersection is
A student trying to test the braking ability of her car determined that she needed 18.5 ft more to stop her car when driving downhill on a road segment of 5% grade than when driving downhill at the same speed along another segment of 3%. Determine the speed at which the student conducted her test in kph. Use f= 0.25 Hint = 5280 ft.
NOTE: This is a multi-part question. Once an answer is submitted, you will be unable to return to this part. Three seconds after automobile B passes through the intersection shown, automobile A passes through the same intersection. Given, the speed of automobile A is VA = 95.00 mi/h and automobile B is vg = 50.00 mi/h, respectively. Also, know that the speeds are constant for the automobiles during the encounter. N 70° S + VA vB Determine the distance between the two automobiles 2 s after A has passed through the intersection. The distance between the two automobiles 2 s after A has passed through the intersection is 356.5 ft.