# Posts by Johnathon

Total # Posts: 59

**Math**

At the beginning of a trip, Gail's odometer reading was 100001 km. Gail filled the tank with 35L of gas. During the trip Gail bought 48L of gas, and at the end of the day filled the tank with 45.5L of gas. Gail was surprised to find at that time tat the odometer was the ...

*October 16, 2016*

**Math**

A factory that runs 24 hours a day, 7 days a week, has shifts for its workers that are 7 hours long. If a shift starts on Sunday morning at 6AM, at what time does the earliest shift on the next Friday start?

*October 6, 2016*

**Physics**

Two identical massless springs are hung from a horizontal support. A block of mass 3.2 kg is suspended from the pair of springs.The acceleration of gravity is 9.8 m/s^2. When the block is in equilibrium, each spring is stretched an additional 0.32 m.The force constant(k) of ...

*January 17, 2016*

**calculus**

Find the volume V of the described solid S. The base of S is the region enclosed by the parabola y = 3 − 2x2 and the x−axis. Cross-sections perpendicular to the y−axis are squares.

*November 10, 2011*

**calculus**

Find the volume V of the described solid S. The base of S is an elliptical region with boundary curve 9x2 + 25y2 = 225. Cross-sections perpendicular to the x-axis are isosceles right triangles with hypotenuse in the base.

*November 10, 2011*

**calculus**

Find the volume V of the described solid S. The base of S is a circular disk with radius 2r. Parallel cross-sections perpendicular to the base are squares.

*November 10, 2011*

**calculus**

thanks the exact answer is 29/294

*October 24, 2011*

**calculus**

How do you find the ariea between these curves? y=4x^2 y=7x^2 4x+y=3 x>=0?

*October 24, 2011*

**calculus**

the velocity at time t is the derivative. the derivative of s(t) with respect to t = -A*sin(ùt + ä)(t) assuming that everything but t and s(t) are constent. to find out when the velocity is 0 we just have to set the derivative = to 0 and solve for t so it looks ...

*September 27, 2011*

**CALCULUS help please**

what is delta x approching? if it is approching 0 this is the definition of the derivative. so it will be 8x-3. I got this by using the rule that the derivative of ax^n=n*a*x^n-1. but they probboly want you to do it without taking the derivative.so lets start by writing it out...

*September 26, 2011*

**Calculus**

use lptals rule the derivative of tan(5x)=sec(5x)^2 the derivative of sin(25x)=cos(25x)*5 the lim of tan(5x)/(sin(25x))=the lim of sec(5x)^2/(cos(25x)*5) direct substution will work for this limit so I will evaluate at 0 the answer is 1/5

*September 12, 2011*

**calculus infinate sums**

thanks that makes sense

*September 11, 2011*

**calculus infinate sums**

how many terms of the series 1/(n*(ln(n)^8)) from n=2 to infinity would you have to add to find the sum to within 0.01

*September 11, 2011*

**calculus**

Use the quotient rule (gf’-fg’)/g^2 where f is the numerator and g is the denominator. For number 1 f=2x+5 so f’ is 2 and g is 3x-2 so g’ is 3 The derivative is ((3x-2)2-(2x+5)3)/(3x-2)^2 After simplifying the final answer is –19/(3x-2)^2 For number 2 ...

*September 11, 2011*

**AP Calculus AB**

the limit of ab does not always = the limit of a * limit b use lpatls rule i am probboly spelling that wrong but it says that the limit at x approches a of f/g = the limit as x approches a of f'/g' this is only true if the function is of the indeterminate for 0/0 or ...

*September 10, 2011*

**algebra**

multiply and divide by 6 6c+60=6((6c+60)/6)=6(c+10)

*August 15, 2011*

**MATH**

sqrt(16)=4 t=d/4 t=4 4=d/4 d=16 the hammar was dropped from 16 feet

*August 15, 2011*

**Math 209**

1.9%=(1.9)/100 i am not sure that there is an annual interest formula but it might be compounded interest where interest is compounded once a year. the compound interest formula is A=p(1+r/n)^n*t where p is the principle r is the rate n is the compounding period t is the time ...

*August 15, 2011*

**math**

x/x-.5=2x/2x-1 I got that by multiplying by 2/2

*August 15, 2011*

**math 116**

x=2/9*(g(x)-4/g(x)) root=none yint=4 vertical asyntote x=2/9 limit at x approches infinity=0 I hope this helps. it will be easier to help you if you post the whole problem

*August 15, 2011*

**Statistics**

Before i state my question I would like to note that I have to do a one tailed test but i don't know how to with the information given. I need a standard deviation, i need a mean, but do i use the mean for yrs drivin or number accidents. Please explain 2.) Car insurance ...

*April 15, 2011*

**physics collision**

A 0.060 kg tennis ball, moving with a speed of 7.00 m/s has a head-on collision with a 0.086 kg ball initially moving in the same direction at a speed of 3.10 m/s. Assume a perfectly elastic collision and take the initial direction of the balls as positive.

*February 24, 2011*

**physics for scientists and engeneers I**

A tennis ball of mass m = 0.065 kg and speed v = 35 m/s strikes a wall at a 45° angle and rebounds with the same speed at 45° (see figure). What is the impulse given to the wall? Magnitude

*February 20, 2011*

**math**

probability is number of defective bulbs over total number of bulbs. 6% of 150 over 150. probability = 3/50

*February 20, 2011*

**Algebra: Help please**

no for first yes for second

*February 18, 2011*

**math**

c=(a^3+b^3)^1/3 b=(c^3-a^3)^1/3 a=(c^3-b^3)^1/3

*February 18, 2011*

**physics lab**

A bullet is shot into a block of plastic. The bullet penetrates the block 0.75 m. The mass of the bullet is 8 g. It is traveling with a speed of 410 m/s before it hits the block. A Use kinematic equations to find the magnitude of the acceleration on the bullet as it is ...

*February 16, 2011*

**physics for scientists and engeneers I**

Suppose the roller coaster in the figure (h1 = 40 m, h2 = 14 m, h3 = 30) passes point A with a speed of 2.60 m/s. If the average force of friction is equal to one fifth of its weight, with what speed will it reach point B? The distance traveled is 35.0 m.

*February 16, 2011*

**Calc**

(sqrt(3)/6)*arctan((sqrt(3)/2)*x) your welcome

*February 16, 2011*

**Calc**

2x+8*ln(x-4)

*February 16, 2011*

**Calc**

sqrt(x^2+2x-4)+c

*February 16, 2011*

**physics uncertenty**

What is the algebraic expression for the uncertainty in the centripetal acceleration σac for uniform circular motion in terms of the uncertainties in the period and the radius of the motion? (Use the following as necessary: σT, σr, ac , T, and r.)

*February 16, 2011*

**math**

(15/100)s=5250 s=35000

*February 16, 2011*

**Calc**

u=x^2+1 du=2x dx integral of 1/2 1/u du=1/2*ln(x^2+1)

*February 15, 2011*

**Math**

There are no natural even numbers that are prime except 2.

*February 15, 2011*

**physics for scientists and engeneers I**

A 0.145-kg baseball pitched horizontally at 27 m/s strikes a bat and is popped straight up to a height of 43 m. If the contact time between the bat and the ball is 2.35 ms, calculate the average force [exerted by the bat on the ball] during contact. [Let the positive axis lie ...

*February 15, 2011*

**math**

10.31250000

*February 15, 2011*

**physics for scientists and engeneers I**

During a workout, the football players ran up the stadium stairs in 59 s. The stairs are 140 m long and inclined at an angle of 40°. If a typical player has a mass of 103 kg, estimate the average power output on the way up. Ignore friction and air resistance.

*February 15, 2011*

**Math**

Volume of a sphere V=(4*Pi)/3*r^3 Domain all real numbers you can cube any real number and multiply it by another real number. This is a one to one cubic with an inverse. Solve for v in r=(4*Pi)/3*v^3 to find it. It is v= (1/4)* (3^1/3)*(4^2/3)*(r/Pi)^1/3

*February 15, 2011*

**math**

y=1/2*x-5

*February 14, 2011*

**math**

y=slope*x+y intercept -2

*February 14, 2011*

**Math**

42/5 about 8.400

*February 14, 2011*

**math**

x intercept occurs when y=0 solve -5x=-45 x intercept occurs at x=9 y intercept occurs when x=0 solve 9y=-45 y intercept occurs at y=-5

*February 14, 2011*

**Math**

s(c)=c+(45/100)c

*February 14, 2011*

**math**

(65+49+24+15)/4=153/4 about 38.2500

*February 14, 2011*

**Math**

s(c)=c+(45/100)c

*February 14, 2011*

**math**

slope=(-13--7)/4-2 =-3 -7=-3*2+b y intercept=-1 y=-3x-1

*February 14, 2011*

**Algebra 1**

x=y+2 (y+2)^2+y^2=24 2y^2+4y+4=24 .5y^2+y=5 quadratic formula y=-1+sqrt(11),-1-sqrt(11) x=1+sqrt(11),1-sqrt(11)

*February 14, 2011*

**math**

8k=2c-9d 8k-2c=-9d -8k+2c=9d (-8k+2c)/9=d if k=2c-(9d/8) k-2c=-9d/8 9d=8(k-2c) d=8(k-2c)/9

*February 14, 2011*

**math**

y=1/2(8x+4) 2y=8x+4 1/8(2y-4)=x

*February 14, 2011*

**algebra**

If the value is a solution then it will make the statement true when it is substituted in. 3*2+4=10 10 is grater then 9 so 2 is a solution. To get a number that makes this false we can solve 3x+4=9. X=5/3

*February 14, 2011*

**physics**

Proper design of automobile braking systems must account for heat buildup under heaving braking. Calculate the thermal energy dissipated from brakes in a 1460-kg car that descends a 15.5° hill. The car begins braking when its speed is 92 km/h and slows down to a speed of ...

*February 14, 2011*

**math**

Odds are the same as probability. The probability of a single event is what you want to happen over all possibilities. All possibilities = total number of students 10+15=25 Odds of choosing a girl 15/25=3/5 Odds of choosing a boy 10/25=2/5

*February 14, 2011*

**Physics**

Well the answer to part one was 117.5 and do you have any idea about how to do part 2

*November 15, 2008*

**Physics**

Three part problem cant figure out the second and third parts (part 1 of 3) A cart loaded with bricks has a total mass of 12.9 kg and is pulled at constant speed by a rope. The rope is inclined at 20.6 ◦ above the horizontal and the cart moves 25.8 m on a horizontal ...

*November 15, 2008*

**history**

What happened to a knight when they broke a promise?

*November 29, 2007*

**history**

What happened to a knight when they broke a promise?

*November 29, 2007*

**history**

Who roamed ancient Roman roadsides waiting for unwary travelers during the medievel period?

*November 14, 2007*

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