2/20 In traveling a distance of 3 km between points A and D, a car is driven at 100 km/h from A to B for t seconds and 60 km/h from C to D also for t seconds. If the brakes are applied for 4 seconds between B and C to give the car a uniform deceleration, calculate t and the distance s between A and B. 100 km/h 60 km/h A B C D 3 km

2/20 In traveling a distance of 3 km between points A and D, a car is driven at 100 km/h from A to B for t seconds and 60 km/h from C to D also for t seconds. If the brakes are applied for 4 seconds between B and C to give the car a uniform deceleration, calculate t and the distance s between A and B. 100 km/h 60 km/h A B C D 3 km

International Edition---engineering Mechanics: Statics, 4th Edition

4th Edition

ISBN:9781305501607

Author:Andrew Pytel And Jaan Kiusalaas

Publisher:Andrew Pytel And Jaan Kiusalaas

Chapter1: Introduction To Statics

Section: Chapter Questions

Problem 1.19P: Plot the earths gravitational acceleration g(m/s2) against the height h (km) above the surface of...

See similar textbooks

Similar questions

A truck travelling at 70km/h suddenly puts on the brakes and it takes 50 seconds to travel the next 1 km. Find the Deceleration and the distance travelled to come to a complete stop.
The robot arm is elevating and extending simultaneously. At a given instant, θ = 25°, θ˙ = 24 deg/s = constant, l = 0.53 m, l˙ = 0.21 m/s, and l¨ = -0.08 m/s2. Compute the magnitudes of the velocity v and acceleration a of the gripped part P. In addition, express v and a in terms of the unit vectors i and j.
2/120 A baseball player releases a ball with the initial con- ditions shown in the figure. Determine the radius of curvature of the trajectory (a) just after release and (b) at the apex. For each case, compute the time rate of change of the speed.
Compute the acceleration of body B and the tension in the cord attached to it Ans.: 4.2 ft/sec² and 123.8lb
The horizontal motion of the plunger and shaft is arrested by the resistance of the attached disk which moves through the oil bath. The velocity of the plunger is v0 = 3.1 m/s in the position A where x = 0 and t = 0, and the deceleration is proportional to v so that a = -kv where k = 0.32 s-1. Find (a) the velocity when t = 2.9 s, (b) the position x when t = 2.9 s, (c) the velocity when x = 4.2 m.
The speed of a car increases uniformly with time from 50 m/s at A to 100 m/s at B during 10 seconds. The radius of curvature of the hump at A is 40 m. If themagnitude of the total acceleration of the mass center of the car is the same at B as at A, compute the radius of curvature ρBof the dip in the road at B. The mass center of the car is 0.6 m from the road.
A subway car leaves station A; it gains speed at the rate of 4 ft/s² for 6 s and then at the rate of 6 ft/s² until it has reached the speed of 48 ft/s. The car maintains the same speed until it approaches station B; brakes are then applied, giving the car a constant deceleration and bringing it to a stop in 6 s. The total running time from A to B is 40 s. Determine the distance between stations A and B. . Do not type the solution. Show the complete computation/solution with the necessary graphs or diagrams.
Applying principles of dynamics A freighter is moving at a speed of 8 nautical miles per hour. The engines then had to be suddenly stopped. If it takes 10 minutes for the freighter to reduce its speed to 3 knots, determine the distance moved by the ship and its speed at the end of this interval. The deceleration of the ship is propor-tional to the square of its speed such that a = -kV^2.
A particle which moves with curvilinear motion has coordinates in millimeters which vary with the time t in seconds according to x=3t²-4t and y=4t²-⅓t³ . Determine the magnitudes of the velocity v and acceleration a and the angles which these vectors make with the x-axis when t = 2s
IF A=is equal to 7kg and B=4kg ,and theta is 35 degrees Find the acceleration of the blocks and the force in the rope
A sprinter (عداء رياضي) in a 200-m race accelerates uniformly from rest for the first 40 m in 8.5 second and then runs with constant velocity to the end line. Calculate: a. His acceleration in first 40 m. b. His final velocity. c. His time for all 200 m race.
5. A flywheel 6 ft. in diameter accelerates from rest at the constant rate of 4 rpm per sec. Compute the normal and tangential components of the acceleration of a particle on the rim of the flywheel after 10 sec.