alg
posted by patricia .
1. (20 points) Police use the equation to estimate the speed (s) of a car, in miles per hour, based on the length (x), of its skid marks upon sudden braking on dry asphalt.
a. Solve this equation for d.
b. A motorist is involved in an accident. The skid marks are measured to be 90 + Z (remember, Z represents the last two digits of your IRN) feet long. Estimate the motoristâ€™s speed before braking. Round to the nearest whole number.
c. If you are driving at 60 miles per hour, how long would your skid marks be using this formula. Round to the nearest foot.
d. A common rule of thumb is to leave one car length for each 10 miles per hour that you are driving. If your car is 18 feet long and you are driving at 60 miles per hour, ignoring reaction time, does this give your car enough time to stop if the car in front of you manages to stop instantly (perhaps by hitting a large obstacle in the road)?
2. (20 points) For each planet in our solar system, its year is the time it takes the planet to revolve once around the sun. The equation T2 d3 = C relates the planetâ€™s year (T) to its average distance to the sun (d).
a. For the earth, T is about 365 days and d is about 149 million kilometers (93 million miles). Using these values, with d in millions of kilometers, and T in days, find C. Round C to be in the form #.## x 10n (write C in scientific notation with two digits after the decimal. Replace each # with a digit and n with an appropriate integer).
b. Using this equation and the value you found for C, find the distance to Uranus whose year is about 30,000 days (round to the nearest hundred million km).
c. Venus is about 108 million km from the sun on average. How long is its year in earthdays (round to the nearest whole day)?
d. The asteroid belt can be found between Mars and Jupiter. Most of the belt lies between 300 and 650 million kilometers from the sun. If you were to discover an asteroid that is 300+Z (remember, Z represents the last 2 digits of your IRN) million km from the sun, how long would its year be in earthdays (round to the nearest whole day)?
Respond to this Question
Similar Questions

Algebra
1. Many people know that the weight of an object varies on different planets, but did you know that the weight of an object on earth also varies according to the elevation of the object? 
Alg2
Help w/Word Prob: LAW ENFORCEMENT A police accident investigator can use the formula s=2√5l to estimate the speed=s of a car in miles per hour based on the length=l in feet of the skid marks it left. How fast was a car traveling … 
math
Use the following situation to answer the next four questions. The formula for these questions came from the police department. They use this formula to determine the speed at which the car was going when the driver applied the brakes, … 
math
Use the following situation to answer the next four questions. The formula for these questions came from the police department. They use this formula to determine the speed at which the car was going when the driver applied the brakes, … 
algebra
Use the following situation to answer the next four questions. The formula for these questions came from the police department. They use this formula to determine the speed at which the car was going when the driver applied the brakes, … 
Algebra 2
The Formula s= sqrt 30fd can be estimated the speed of s, in miles per hour that a car is traveling when it goes into a skid, where f is the coefficient of friction and d is the length of the skid marks in feet. Kody skids to a stop … 
Algebra
The formula r =2 sqrt.5L can be used to approximate the speed r, in miles per hour, of a car that has left skid marks of length L, in feet. How far will a car skid at 60 mph? 
Math
The formula r=2sqrt(...)5L can be used to approximate the speed r, in miles per hour, of a car that has left skid marks of length L, in feet. How far will Acari skid at 20 mph? 
Algebra
The formula r=2sqrt(...)5L can be used to approximate the speed r, in miles per hour, of a car that has left skid marks of length L, in feet. How far will a car skid at 70mph? 
math
When a car makes an emergency stop on dry road, it leaves skid marks. The speed S, in miles per hour, of the car when brakes were applied is related to the length L, in feet, of the skid mark. Functional notation is needed, please …