# Jer

Popular questions and responses by Jer
1. ## physics

The speed of a nerve impulse in the human body is about 100 m/s. If you accidentally stub you toe in the dark, estimate the time it takes the nerve impulse to travel to your brain. (Assume that you are approximately 1.8 m tall and that the nerve impulse

2. ## Calculus I

Which of the following represents the volume of the solid formed by revolving the region bounded by the graphs of y =x^3, y = 1, and x = 2, about the line x = 2?

3. ## physics

a jet plane lands with a speed of 101 m/s and can accelerate at a maximum rate of -4.60 m/s2 as it comes to rest. (a) From the instant the plane touches the runway, what is the minimum time needed before it can come to rest? ___s b)What is the actual

4. ## chemistry

calculate the mass in grammes of copper that will be deposited by dissolving 6.5g of zinc in copper tetraoxosulphate(vi) solution

5. ## chemistry

suppose a car operates so inefficently that only 16% of the thermal energy from burning fuel is converted to useful "wheel turning" (mechanical energy) how many kj of useful energy would be stored in a 20 gallon tank of gasoline?(assume that octane burning

6. ## algebra

A motorboat traveling a distance of 225 miles in 5 hours while traveling with the current. Against the current, the same trip took 9 hours. Find the rate of the boat in calm water and the rate of the current. rate of boat mph rate of current mph

7. ## algebra

Flying with the wind, a plane traveled 390 miles in 3 hours. Flying against the wind, the plane traveled the same distance in 5 hours. Find the rate of the plane in calm air and the rate of the wind. rate of plane ? mph rate of wind ? mph

8. ## Chemistry

What is te component concentration ratio, [NO2-]/[HNO2], of a buffer that has a pH of 2.42 (Ka of HNO2=7.1 x 10^-4)?

9. ## calculus

Find the equation of the tangent line to the graph of f(x)=4ln(9x+2)at the point of x-coordinate x=2.

10. ## Calculus I

The area enclosed by the curve y^2 = x(2 − x) is given by what definite integral? Should I begin by square rooting both sides? Not really sure.

11. ## Calculus I

The base of a solid is the circle x^2 + y^2 = 9. Cross sections of the solid perpendicular to the x-axis are squares. What is the volume, in cubic units, of the solid?

12. ## Calculus I

Find the volume of the solid formed by rotating the region bounded by the graph of y equals 1 plus the square root of x, the y-axis, and the line y = 3 about the x-axis.

13. ## trigonometry

the base of an isosceles triangle measures 108 feet and forms an angle of 55 degrees with one equal sides. find the perimeter of the triangle

14. ## algebra

A marketing company asked 100 people whether they liked a new skin cream and lip balm. The company found that 80% of the people who liked the new skin cream also liked the new lip balm, and that 50% of the people who did not like the new skin cream liked

15. ## algebra

A goldsmith has two gold alloys. The first alloy is 30% gold; the second alloy is 80% gold. How many grams of each should be mixed to produce 10 grams of an alloy that is 40% gold? amount of 30% gold ___ g amount of 80% gold ___ g

16. ## algebra

Solve by using a system of equations. The number x of MP3 players a manufacturer is willing to sell is given by x = 20p − 1500, where p is the price, in dollars, per MP3 player. The number x of MP3 players a store is willing to purchase is given by x =

17. ## Linear Algebra - Question

I have this number that I just wanted to be sure how to do. They give me a Parallelepiped with corners lettered from A to H. Then the question is: In a certain orthonormal reference, the coordinates of points A, B, D and E are respectively A(0,0,2)

18. ## Linear Algebra - Question

I have this number that I just wanted to be sure how to do. They give me a Parallelepiped with corners lettered from A to H. Then the question is: In a certain orthonormal reference, the coordinates of points A, B, D and E are respectively A(0,0,2)

19. ## Linear Algebra - Question

I have this number that I just wanted to be sure how to do. They give me a Parallelepiped with corners lettered from A to H. Then the question is: In a certain orthonormal reference, the coordinates of points A, B, D and E are respectively A(0,0,2)

20. ## Differential Calculus

y = 1 + (x-1)^(1/2) Considering the interval (2,4), calculate delta(y) and dy. would delta(y) be: delta(y) = f(4) - f(2) = (1 + squr(3) ) - 2 = squr(3) - 1 and dy is 1/(2 squr(x-1)) dx Thank you

21. ## math 118

a. Suppose a market research company finds that at a price of p = \$6., they would sell x = 44 tiles each month. If they lower the price to p = \$2, then more people would purchase the tile, and they can expect to sell x = 48 tiles in a month’s time. Find

22. ## physics

Traumatic brain injury such as concussion results when the head undergoes a very large acceleration. Generally, an acceleration less than 800 m/s2 lasting for any length of time will not cause injury, whereas an acceleration greater than 1000 m/s2 lasting

1. ## Physics

First we have to find time, and we can do that by finding Vx and d in the equation Vx = d/t We find Vx with trig cosX*V = Vx cos32*8.5 = Vx Vx = 7.2 m/s [right] Then we find d also through trig tanX = o/a o/tanX = a a = 0.96m/tan32 a = 1.54m Then find t Vx

posted on April 10, 2020
2. ## Physics help

yeah

posted on April 10, 2020
3. ## Biology

Thanks dude!

posted on April 25, 2016
4. ## Calculus I

I meant to phrase the question as, "What integral represents the volume of the solid formed by revolving the region bounded by the graphs of y =x^3, y = 1, and x = 2, about the line x = 2?"

posted on April 22, 2016
5. ## Biology

ahrra negros

posted on September 27, 2012
6. ## Differential Calculus

thanks!

posted on April 28, 2012