1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
stellarik [79]
3 years ago
15

Using a pulley system, a crew does 7,500 J of work to load a box that requires 4,500 J of work. What is the efficiency of the pu

lley system?
Mathematics
1 answer:
miskamm [114]3 years ago
6 0

Answer:

3,000

Step-by-step explanation:

You might be interested in
Amma hikes 2and3/4 miles of nature trail in 1 hour and 15 minutes. How many miles does Amman hike per hour?
LekaFEV [45]
Formula
====
d = r * t

Givens
======
d = 2 3/4
t = 1 hour 15 minutes 
r = ????

Calculations
==========
You need to convert the 15 minutes to hours.
1 hour = 60 minutes
x hour = 15 minutes

1/60 = x/15
x = 15/60
x = 0.25 hours
so the time = 1 hours + 0.25 hours
t = 1.25 hours

Now you need to do something with the distance.
3/4 mile = 0.75 of a mile
So the distance = 2 + 0.75 = 2.75 miles

Now you are ready for the answer.
d = r * t you are looking for r
2.75 = r * 1.25
r = 2.75/1.25
r = 2.2 miles / hour

Note you could do this with fractions.
2 3/4 = 11/4
1 1/4 =  5/4

r = 11/4 // 5/4 =11/5 = 2 1/5 which is the same thing as 2.2. If your calculator can handle fractions (those kind of calculators cost about 10 dollars in Canada. It should be 8 in the US) that might be the way to do this problem.
6 0
3 years ago
Write the equation of the line that passes through (0,5) and is perpendicular to the line x = 3.
Alona [7]

Answer:

(0,5)x3=(15,5)

Step-by-step explanation:

3 0
2 years ago
Which values for A and B will create infinitely many solutions for this system of equations? ax-y=8 2x+y=b
Nata [24]

Answer:

a = -2 , b = -8

Step-by-step explanation:

* Lets talk about the solution of the linear equations

- There are three types of the solutions of the system of linear equations

# If the two lines intersect each other, then there is one solution

- The equations are ax+ by = c , dx + ey = f

# If the two lines parallel to each other, then there is no solution

- The equations are ax+ by = c , ax + by = d in its simplest form ,

  where a is the coefficient of x , b is the coefficient of y and

  c , d are the numerical terms

# If the two lines coincide (over each other), then there are infinite

   solutions

- The equations are ax+ by = c , ax + by = c in its simplest form, where

  a is the coefficient of x , b is the coefficient of y and c is the

  numerical term

* Lets solve the problem

∵ The system of equation is:

   ax - y = 8 ⇒ (1)

   2x + y = b ⇒ (2)

∵ The system create infinitely many solutions

∴ The lines are coincide

- The equations must be equal, then multiply equation(1) or (2) by -1 to

  make the coefficient of y in the two equations equal

∴ -ax + y = -8

∴ 2x + y = b

∵ Their coefficients of x are equal

∵ Their coefficients of y are equal

∵ Their numerical terms are equal

∵ The coefficient of x in equation (1) is -a and in equation (2) is 2

∴ -a = 2 ⇒ multiply both sides by -1

∴ a = 2

∵ The numerical term in equation (1) is -8 and in equation (2) is b

∴ b = -8

* The values for a and b will create infinitely many solutions are -2 , -8

5 0
3 years ago
ANSWER FAST!
salantis [7]

Answer:C

Step-by-step explanation:

7 0
2 years ago
Read 2 more answers
Choose the equation that is equivalent to this statement. 9090 is 70% of x.
Zolol [24]
9090 is 70% of 12,985.7143
5 0
3 years ago
Other questions:
  • Does the equation represent a direct variation? If so, find the constant of variation. 2x - 4y = 0 Question 1 options: yes; k =
    9·1 answer
  • Why does the value of money in a savings account increase over time?
    10·1 answer
  • What is the slope of the line whose equation is 2x-6y=0?
    11·2 answers
  • A Washington Post article from 2009 reported that "support for a government-run health-care plan to compete with private insurer
    7·1 answer
  • When a ball is thrown into the air, the path that the ball travels is modeled by the parabola y − 5 = −0.05(x − 10)2, measured i
    8·1 answer
  • Solve the following system of equations using substitution.<br> y = 2x-2<br> -4x-y = 26
    10·1 answer
  • Pls help, if u put a link I will report
    15·1 answer
  • I don’t know the answer please someone help.
    14·1 answer
  • Find m the in this screenshot
    13·1 answer
  • Start time? Elapsed time 9 3/4 end time 6:00pm
    7·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!