An engineer is setting a speed limit on a road. She wants a car to be able to stop in73.0ft and knows that the maximum rate at which a car can safely brake is17.0n/s.What initial speed (in given units) will allow the car to come a stop at the stop signwhen braking with this acceleration?mphCould a car traveling 40mph come to a stop before the stop sign?yesno

Given Data: The braking distance is s = 73 ft. The braking acceleration is a = 17 ft/s2. The…

An engineer is setting a speed limit on a road. She wants a car to be able to stop in 73.0ft and knows that the maximum rate at which a car can safely brake is 17.0t/s. What initial speed (in given units) will allow the car to come a stop at the stop sign when braking with this acceleration? mph Could a car traveling 40mph come to a stop before the stop sign? yes no

An engineer is setting a speed limit on a road. She wants a car to be able to stop in 73.0ft and knows that the maximum rate at which a car can safely brake is 17.0t/s. What initial speed (in given units) will allow the car to come a stop at the stop sign when braking with this acceleration? mph Could a car traveling 40mph come to a stop before the stop sign? yes no

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

ChapterMA: Math Assessment

Section: Chapter Questions

Problem 1.1MA

See similar textbooks

Similar questions

A particle is observed to start at rest and acceleration at a=30+2t, where t is in seconds, until its velocity is 39.20 m/s. It then hits an obstruction and the acceleration is given by a= -0.003v2, until the velocity decreases to 98.20 m/s. Determine the total distance the particle travelled, and the total time of travel.
How long will it take for a car, starting from rest, to acquire a speed of60 mi/hr if its acceleration is 12 ft/sec 2?
Two American football players with a mass of 75 kg and a mass of 100 kg towards each other at a speed of 6 m/sec and 8 m/sec respectivelythey run. Immediately after hitting each other, they move together at the same speed. Two footballers killed after collisionwhich of the following is its speed?Please select one:a.4.6 m / sb.6.9 m / sc.3.4 m / sd.2 m / se.7.1 m / s
Q1. A driver enters a curved car at 72 km/h, slows down, causing the speed to drop at a steady rate of 4.5 km/h every second. If the radius of curvature is 16.7 m. Find the acceleration of the car after 4 seconds from the driver starting to slow down.
A crate slides down an inclined plane without friction. If it is released from rest and reaches a speed of 6 m/s after sliding a distance of 2.5 m, what is the angle of inclination of the plane with respect to the horizontal?
A particle is observed to start at rest and accelerates at a = 30 + 2t, where t is in seconds, until its velocity is 399.20 m/s. It then hits an obstruction and the acceleration is given by a = -0.003v², until the velocity decreases to 99.20 m/s. Determine the total distance the particle travelled, and the total time of travel.
A certain hawk can fly horizontally (i.e., not diving) at a maximum speed of 80.0 km/hr. The hawk takes off from rest at the edge of a cliff, heading east, and accelerates at a rate of 1.25 m/s2 . a. How long does it take to reach its top speed? b. How far does it travel during this time? c. Once the hawk has reached its top speed, it turns 30 degrees to the south and flies at a constant speed for another 30 seconds. How far is it from the cliff at the end of this journey?
An airplane taking off on a runway 1,200 ft long must acquire a speedof 80 mi/hr to get safely into the air. (a) What is the minimum safe accelerationfor this airplane? (b) How long will it take for the airplane to acquire this speedwhen so accelerated?
A motorboat and its load weigh 2150 N. Assume that the propeller force is constant and equal to 110N, and the water resistance is numerically equal to 6.7V, where V is the speed at any instant time in m/sec. If the boat starts from rest, determine its speed at the end of 10 seconds.
On turning a corner, a motorist rushing at 20 m/s, finds a child on the road50m ahead. He instantly stops the engine and applies brakes, so as to stop the car within 10 m of the child. Calculate (i) retardation, and (ii) time required to stop the car.
A particle is projected from a horizontal plane and has an initial speed of 50m/s at an angle of 30 degrees above the horizontal. For how long is the particle at least 20 m above the level of the plane? Hint: You may use the formulas for the horizontal x(t) and vertical y(t) displacement of the particle: x(t) = ucos(α)t, y(t) - usin(α)t - ½gt2 , g = 10m/sec2.
In a physics lab experiment, you release a small steelball at various heights above the ground and measure the ball’s speedjust before it strikes the ground. You plot your data on a graph that hasthe release height (in meters) on the vertical axis and the square of thefinal speed (in m2/s2) on the horizontal axis. In this graph your datapoints lie close to a straight line. (a) Using g = 9.80 m/s2 and ignoringthe effect of air resistance, what is the numerical value of the slope ofthis straight line? (Include the correct units.) The presence of air resistancereduces the magnitude of the downward acceleration, and the effectof air resistance increases as the speed of the object increases. Yourepeat the experiment, but this time with a tennis ball as the object beingdropped. Air resistance now has a noticeable effect on the data. (b) Isthe final speed for a given release height higher than, lower than, or thesame as when you ignored air resistance? (c) Is the graph of the releaseheight…