The speed limit is 25 miles per hour, but it seems that many of the cars are going faster. The city places 2 counter strips 360 feet apart in the lane closest to the school.A teacher times one car's front tires crossing the strips in the 7.0 sec. Is the car speeding? How do you solve this?

Question

25-08-2016
Mathematics

contestada

The speed limit is 25 miles per hour, but it seems that many of the cars are going faster. The city places 2 counter strips 360 feet apart in the lane closest to the school.A teacher times one car's front tires crossing the strips in the 7.0 sec. Is the car speeding? How do you solve this?

Respuesta :

Otras preguntas

Your company is operating as a subcontractor on a large government contract. The government decides to request proposals for another upcoming project. Your boss

Web Cites Research projects a rate of return of 20% on new projects. Management plans to plow back 30% of all earnings into the firm. Earnings this year will be

Match the terms with their definitions. 1. was introduced in the United States in 1888 2 short ballot 2. used to elect the President, Vice-President, and member

At a flea market, Carol bought 4 used CDs for $4.95 each and 3 used books for $6.25 each ( including taxes ). How much change did Carol receive from $40?.

A 2578-kg van runs into the back of a 825-kg compact car at rest. They move off together at 8.5 m/s. Assuming the friction with the road is negligible, calculat

7. Water flows trough a horizontal tube of diameter 2.5 cm that is joined to a second horizontal tube of diameter 1.2 cm. The pressure difference between the tu

Graph the function f(x)=x^2-4x-5 identify a and b

Pumping apparatus driver/operators must be familiar with the different types of nozzles carried on their apparatus. How would a particular type of nozzle being

From the enthalpies of reactionH2 (g) + F2 (g) → 2 HF (g) ΔH = -537 kJC (s) + 2 F2 (g) → CF4 (g) ΔH = -680 kJ2 C (s) + 2 H2 (g) → C2H4 (g)

Waterway Co. purchased land as a factory site for $536,000. The process of tearing down two old buildings on the site and constructing the factory required 6 mo

AL2006 AL2006 · Answer 1 · 2016-08-25T02:20:30+02:00

You figure out how long it would take a car traveling at 25 mph
to cover 360 ft. Any driver who does it in less time is speeding.

   (25 mi/hr) · (5,280 ft/mile) · (1 hr / 3,600 sec)

   = (25 · 5280 / 3600) ft/sec = (36 and 2/3) feet per second.

To cover 360 ft at 25 mph, it would take

360 ft / (36 and 2/3 ft/sec) = 9.82 seconds .

Anybody who covers the 360 feet in less than 9.82 seconds
is moving faster than 25 mph.
_________________________________

If you're interested, here's how to do it in the other direction:

Let's say a car covers the 360 feet in ' S ' seconds.
What's the speed of the car ?

   (360 ft / S sec) · (1 mile / 5280 feet) · (3600 sec/hour)

   = (360 · 3600) / (S · 5280) mile/hour

   = 245.5 / S miles per hour .

The teacher timed one car crossing both strips in 7.0 seconds.
How fast was that car traveling ?

   245.5 / 7.0 = 35.1 miles per hour

Another teacher timed another car that took 9.82 seconds to cross
both strips. How fast was this car traveling ?

245.5 / 9.82 = 25 miles per hour