A train which is traveling at 75 mi/hr applies its brakes as it reaches point A and slows down with a constant deceleration. Its decreased velocity is observed to be 55 mi/hr as it passes a point 1/2 mi beyond A. A car moving at 50 mi/hr passes point B at the same instant that the train reaches point A. In an unwise effort to beat the train to the crossing, the driver "steps on the gas." Calculate the constant acceleration a that the car must have in order to beat the train to the crossing by 3.3 sec and find the velocity v of the car as it reaches the crossing. Answers: a = V= i i Train 75 mi/hr A 1.0 mi 1.1 mi B Car 50 mi/hr ft/sec² mi/hr

A train which is traveling at 75 mi/hr applies its brakes as it reaches point A and slows down with a constant deceleration. Its decreased velocity is observed to be 55 mi/hr as it passes a point 1/2 mi beyond A. A car moving at 50 mi/hr passes point B at the same instant that the train reaches point A. In an unwise effort to beat the train to the crossing, the driver "steps on the gas." Calculate the constant acceleration a that the car must have in order to beat the train to the crossing by 3.3 sec and find the velocity v of the car as it reaches the crossing. Answers: a = V= i i Train 75 mi/hr A 1.0 mi 1.1 mi B Car 50 mi/hr ft/sec² mi/hr

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

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Conservation of Energy

In physics, the rule of the conservation of energy states that energy doesn’t disappear from the atmosphere; instead, it changes its form from one type to another. Energy is one of the most important physical quantities in nature, and it cannot be created or destroyed — only transformed.

Question

A train which is traveling at 75 mi/hr applies its brakes as it reaches
point A and slows down with a constant deceleration. Its decreased
velocity is observed to be 55 mi/hr as it passes a point 1/2 mi beyond
A. A car moving at 50 mi/hr passes point B at the same instant that
the train reaches point A. In an unwise effort to beat the train to the
crossing, the driver "steps on the gas." Calculate the constant
acceleration a that the car must have in order to beat the train to the
crossing by 3.3 sec and find the velocity v of the car as it reaches the
crossing.
Tw
Answers:
a = i
V = i
Train
75 mi/hr
1.0 mi
1.1 mil
B
Car
50 mi/hr
ft/sec²
mi/hr

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