Variation Problems
Not what you're looking for?
Solve each variation problem:
1. If m varies jointly as z and p, and m=10 when z=2 and p=7.5, find m when z=5 and p=7.
2. Current in a circuit: The current in a simple electrical circuit varies inversely as the resistance. If the current is 50 amps when the resistance is 10 ohms, find the current if the resistance is 5 ohms.
3. Long Distance Phone Calls: The number of long-distance phone calls between two cities in a certain time period varies directly as the population P1 and P2 of the cities, and inversely as the distance between them. If 10,000 calls are made between two cities 500 miles apart, having populations of 50,000 and 125,000, find the number of calls between two cities 800 miles apart, having populations of 20,000 and 80,000.
4. What happens to y if y is inversely proportional to x, and x is tripled?
Purchase this Solution
Solution Summary
This posting contains the solution to the given problems.
Solution Preview
Solution:
1. We have:
m = kzp
10 = k(2)(7.5)
k = 10/15 = 2/3
m = (2/3)(5)(7)
m = ...
Purchase this Solution
Free BrainMass Quizzes
Exponential Expressions
In this quiz, you will have a chance to practice basic terminology of exponential expressions and how to evaluate them.
Solving quadratic inequalities
This quiz test you on how well you are familiar with solving quadratic inequalities.
Multiplying Complex Numbers
This is a short quiz to check your understanding of multiplication of complex numbers in rectangular form.
Know Your Linear Equations
Each question is a choice-summary multiple choice question that will present you with a linear equation and then make 4 statements about that equation. You must determine which of the 4 statements are true (if any) in regards to the equation.
Probability Quiz
Some questions on probability