# Posts by ana

Total # Posts: 1,368

**Math-Physics**

What is the total force on the bottom of a 400-cm-diameter by 1.5-m-deep round wading pool due to the weight of the air and the weight of the water? (Note the pressure contribution from the atmosphere is 1.0 x 10^5 N/m^2, the density of water is 1 g/cm^3, g=9.8m/s^2.) (Answer...

**Physics**

If the gravitational force between the electron (9.11 ? 10-31 kg) and the proton (1.67 ? 10-27 kg) in a hydrogen atom is 1.06 ? 10-47 N, how far apart are the two particles?

**Physics**

hey you know what, youre right

**Physics**

hmm this would make the answer

**Physics**

the letter are what again

**Physics**

The gravitational force of attraction between two students sitting at their desks in physics class is 2.34 ? 10^-8 N. If one student has a mass of 45.0 kg and the other student has a mass of 61.6 kg, how far apart are the students sitting?

**Probability**

It looks like the options are incomplete

**Math**

This year, The Rockport Times had 774 subscribers. That is 70% fewer than they had last year, before the paper was bought out. How many subscribers did the paper have last year? I am not strong at percent equations, could someone please give me a deep explanation?

**Math**

3. Explain how you can tell if an equation has no infinite solution, write an example and solve. I don't understand how you can tell, help?

**Math**

Thank you Reiny!!

**Math**

Finished an equation and got an answer of 8 = -6 Is this no solution for the final answer?

**Physics **

A 64 kg skier is on a 18 degree slope. The coefficient of kinetic friction between the skis and snow is .04. A) What is the weight of the skier? B) what is the normal force of the slope on the skier? C) why is the “parallel” force on the skier? D) what is the ...

**History**

Thank you!! My notes weren't too good.

**History**

What was Article V (5) about in the Articles of Confederation?

**Math**

How can an exponent be negative? Use an example. Having trouble with this prompt, I don’t know how to explain what it is asking for.

**Math**

Oh thank you @Steve I understand now

**Math**

Does m^8/m^4 (Exponent) equal m^2? I think it does.

**Math**

Thank you

**Math**

At midnight the temperature was 9 C. If the temperature rose 4 C per hour, what was the temperature at 9:00 AM? I said 36 C but it was incorrect, help?

**Math**

Thank you Reiny I got it correct

**Math**

One day at 1:00 P.M, the temperature was 7 F in Kodiak, Alaska. At 9:00 P.M. the temperature was -17 F. What was the average change in temperature per hour?

**College Algebra**

How much water must be evaporated from 32 ounces of a 7% salt solution to make a 8% salt? solution? (Answer is in ounces)

**Math**

Is the square of a rational number always greater than the number ?

**geometry**

The bases of trapezoid $ABCD$ are $\overline{AB}$ and $\overline{CD}$. We are given that $CD = 8$, $AD = BC = 7$, and $BD = 9$. Find the area of the trapezoid.

**physics**

a plane flying due north at 100 m/s is blown by a. 50 m/s strong wind due east. b. what is the plane's resultant velocity?

**Calculus**

The shoreline of a lake is a circle with diameter 3 km. Peter stands at point E and wants to reach the diametrically opposite point W. He intends to jog along the north shore to a point P and then swim the straight line distance to W. If he swims at a rate of 3 km/h and jogs ...

**Math**

The number of boys in a class is 10 less than twice the number of girls. Find the total number of the students in the class, if the number of boys is 5 more than the number of girls.

**Math**

A barber and his apprentice earn $4900 in a week. The barber earns $200 more per day than his apprentice. How much does the apprentice earn in one day?

**Math**

Amira and Malika are counting their school books. Amira has four times 7 less than the number of Malik's books. If Amira has 29 books how many books does Malika have?

**Physics**

a= 2.47 yds/s b= 2.49 yds/s

**Physics**

an earth satellite has an elliptical orbit with an eccentricity value, e=0.40 and on orbital period of 10 hours and 54.0 minutes. Find the height above the surface at its closest approach point.

**Algebra**

A=1/2 * b * h 1/2 * x * x=18 1/2x^2=18 X^2= 18 * 2 x^2= 36 x= 6m length of each leg

**Algebra**

The area of an isosceles right triangle is 18cm square. Find the lengths of the legs.

**physics**

A car with a mass of 980 kg and a speed of v1 = 17.0 m/s approaches an intersection, as shown in the figure(Figure 1) . A 1300 kg minivan traveling at v2 is heading for the same intersection. The car and minivan collide and stick together. The direction of the wreckage after ...

**physics homework**

To make a bounce pass, a player throws a 0.60-kg basketball toward the floor. The ball hits the floor with a speed of 5.2 m/s at an angle of 60 ? to the vertical. Part A If the ball rebounds with the same speed and angle, what was the magnitude of the impulse delivered to it ...

**physics**

A 55-kg person walks due north with a speed of 1.1 m/s, and her 7.0-kg dog runs directly toward her, moving due south, with a speed of 1.8 m/s.

**Math**

Around a pond

**Math**

The drawing of a road a pound ,shown below has a scale of 1 inch to 5km Dimension is 3 inch wide and 5 in long What is the total distance in km of the actual road A 16 B 40 C 80 D160

**physics pls help**

The resilin in the body of a flea has a force constant of about 28 kg, and when the flea cocks its jumping legs, the resilin associated with each leg is stretched by approximately 0.10 mm. Part A Given that the flea has a mass of 0.56 mg, and that two legs are used in a jump, ...

**physics question**

A skateboarder at a skate park rides along the path shown in (Figure 1) .a=2.7 m and b=1.0m Part A If the speed of the skateboarder at point A is v=1.6m/s, what is her speed at point B? Assume that friction is negligible.

**physics**

A 2.0 kg mass is sliding on a flat surface, with an initial speed of 20 m/s, and a coefficient of friction of 0.2. what is the magnitude of its acceleration? I know the answer is 2.0 m/s^2, but can someone show me how ?

**Chemistry**

Consider the following decomposition reaction of ammonium carbonate ((NH4)2CO3): (NH4)2CO3 (s) ? 2 NH3 (g) + CO2 (g) + H2O (g) In one experiment at 25.0°C, a sample of pure (NH4)2CO3 is placed in an evacuated 2.00 L vessel. At equilibrium, the total pressure is found to be...

**PHYSICS**

Two springs, with force constants k1=175N/m and k2=270N/m, are connected in series, as shown in (Figure 1) . Part A: When a mass m=0.50kg is attached to the springs, what is the amount of stretch, x? k1 I k2 I m ? ] x

**physics**

Two springs, with force constants k1=175N/m and k2=270N/m, are connected in series When a mass m=0.50kg is attached to the springs, what is the amount of stretch, x?

**physics **

During an episode of turbulence in an airplane you feel 180 N heavier than usual. Part A If your mass is 86 kg, what are the magnitude and direction of the airplane’s acceleration? 2sf

**Physics**

I figured out a) is 0 N because the velocity is constant

**Physics**

The figure is just mass A on top of mass B. There are no forces or anything shown. Block A, of mass 3.2 kg, is on block B, of mass 7 kg, as shown in the above figure. The lower block is on a frictionless surface while the coefficient of static friction is 0.25 between the two ...

**Math**

The manager of a store orders canoes that cost $400 and sells them for 828. what percentage is the mark-up?

**Science**

Do light and sound travel at the same speed through solids, liquids, and gasses? What are the effects of light and sound traveling through different objects?

**physics**

In a friendly game of handball, you hit the ball essentially at ground level and send it toward the wall with a speed of 17 m/s at an angle of 39 ? above the horizontal. How long does it take for the ball to reach the wall if it is 3.8 m away? How high is the ball when it hits...

**physics**

A soccer ball is kicked with a speed of 16.7 m/s at an angle of 45.0 ? above the horizontal.If the ball lands at the same level from which it was kicked, for what amount of time was it in the air?

**American Government PLEASE CHECK MY ANSWER!!**

7. Which of the following six organizing principles are evident in Articles I – III of the U.S. Constitution? Select all that apply. A. Limited government.*** B. Separation of powers. C. Judicial review.*** D. Checks and balances. 8. Which of the following did the ...

**American Government PLEASE CHECK MY ANSWER!!**

I chose A!

**American Government PLEASE CHECK MY ANSWER!! **

6. The constitutional prohibition against laws respecting an establishment of religion must at least mean that, in this country, it is no part of the business of government to compose official prayers for any group of the American people to recite as part of a religious ...

**Math**

Four members of the Kaplan family will take a river trip down the Colorado River in Colorado State Park. The rafting company charges $10 per person for a half-day river trip, or $100 flat rate for a half-day river trip. The raft can hold up to 10 people. How much will the trip...

**Physics**

The initial velocity, the final velocity, and the time are given. Using one of the equations of kinematics, you can calculate the displacement directly. An airplane starts from rest and reaches a takeoff velocity of 60.0 m/s due north in 4.0 s. How far has it traveled before ...

**Math**

thank you Ms. Sue

**Math**

can you please help me work on this problem? I have a few and I want to know how to figure it out: The ratio of boys to girls in a class is 5 to 6. How many boys at in the class if there is a total of 121 students. I guessed 55 boys and 66 girls?

**Math**

d 3 to 5

**Math**

Which of the following is NOT a correct ratio for 12 stars and 15 hearts? a. 12 to 15 b. 4:5 c. 12/15 d. 3 to five

**Math**

Benson is 2 years less than twice Jackson age and all together equal 19

**math(geometric series)**

Thanks :)

**Math**

The salary of an employee in 1985 is $1200,in 1987 it will be $1350. Express salary as a linear function of time and estimate his salary in 1988.

**Math**

It is required to seat 5 men and 4 women in a row so that the women occupy the Even place. How many arrangements are possible?

**Math**

A family has 3 children. Their first child was a girl. What I'd the probability that the two children are of different gender?

**MATH**

the line 'l' has gradient 3 and cuts the x-axis at 4 then its equation?

**Math**

If the demand function of the monopolist is {p=200-0.5x} and its cost function is {C=100+5x+7x^2}. Value of 'x' , price and the amount of profit for which profit maximizes are:

**Math**

The probability that a person stopping at petrol pump will get his tyres checked is 0.12, the probability that he will get his oil checked is 0.29 and the probability that he will get both checked is 0.07. A) what is the probability that a person stopping at this pump will ...

**Math**

2(l+w)=44. l=2w+7 2(2w+7+w)=44 6w+14=44 w=5 l=2(5)+7 l=17

**Physics**

Thank you so much!

**Physics**

A child of mass 30 kg stands beside a circular platform of mass 95 kg and radius 2.4 m spinning at 2.3 rad/s. Treat the platform as a disk. The child steps on the rim. a) What is the new angular speed? b) She then walks to the center and stay there. What is the angular ...

**Physics**

Thanks Damon you're the real MVP! It was rad/s sorry.

**Physics**

A circular disk of mass 0.4 kg and radius 36 cm, initially not rotating, slips down a thin spindle onto a turntable (disk) of mass 1.7 kg and the same radius, rotating freely at 3.4 a) Find the new angular velocity of the combination; b) The change in the kinetic energy? c) If...

**math**

Thank you God bless you :)

**math**

an arithmetic series is such that the ninth term is zero and the sum of first 25 terms is 50.the first term of the series?

**math**

the 54th term and 4th term of an A.P are -61 and 64 respectively.Find the common difference and 23rd tem

**Physics**

A block of mass 2.5 kg hangs vertically from a frictionless pulley of mass 6.5 kg and radius 16 cm. Treat the pulley as a disk. Find: a) the acceleration of the block b) the tension in the rope I don't even know where to begin,

**Physics**

A torque of 50 N*m acts on a wheel of moment of inertia 25 kg*m^2 for 4 s and then is removed. b)How many revolutions does it make in 15 s if it starts at rest? I found the angular acceleration, 2 rad/s^2, but I don't know how to find the amount of revolutions.

**Math**

thanks for hepling God bless you

**Math**

If thrice of "A's" age 6 years ago be subtracted from twice his present age the result would be equal to his present age. Find "A's" present age.

**Math**

thank you for helping God bless you

**Math**

Ten years ago the age of the father was four times of his son. Ten years hence the age of the father will be twice that of his son. The present ages of father & son are?

**Math**

thank you for helping God bless you :)

**Math**

A number is as much greater than 21 and is less than 71. The number is?

**College Math**

Suzan sees a bag of marbles, she grabs a handful at random. She has seen a bag containing three red marbles, three green ones, four white ones, and three purple ones. She grabs seven of them. Find the probability of the following event, expressing it as a fraction in lowest ...

**Calculus**

The ladder would end up making a right triangle with the ground and the wall, so that makes it possible to use the sine law because you know the angle across from the ladder. 18/sin 90 = x/sin 70 x = 18*sin 90 = 16.91m

**Calculus**

It's cool. I figured it out on my own. But for anyone in the future who needs help with a similar question: F'(a)=f'(a^4)*4a^3 =12*4*15 =720 G'(a)=4(f(a))^3*f'(a) =4(2)^3*4 =128 You just have to replace x with a and use the chain rule. I didn't realize ...

**Calculus**

Let F(x)=f(x^4) and G(x)=(f(x))^4. You also know that a^3=15, f(a)=2, f?(a)=4, f?(a^4)=12. Find F?(a) and G?(a). I don't even know where to begin.

**math**

a company sells one of its product at Rs.12 per unit a year.its cost function is given by [c(x)=0.01x^2+8^x+7],where x represents the number of units.the number of units and the maximum profit for which profit function maximizes are:

**yeah solved**

Thanks :)

**math**

A man travels 600km partly by train and partly by car.If he covers 120km by train and rest by car ; it takes him 8 hours.But if he travels 200km by train and and by car ; he takes 20 minutes longer.Find the speed of the train and that of the car.

**math**

Perfect ! Thanks May God bless you :)

**math**

2 men and 5 boys can do a piece of work in 4 days, while 4 men and 4 boys can do it in 3 days.How long it would take one man alone to do it and how many days ity would take one boy to do it alone?

**math**

if the length of a rectangle is one-third the perimeter of the rectangle,then the width of the rectangle is what fraction of the perimeter?

**math**

5 oranges when removed from a basket containing three more than seven times as many oranges,leave how many oranges in the basket?

**math**

thanks

**math**

a computer cost $40,000 to purchase.Renting the same computer requires making $5000 , non-refundable deposits and monthly payments of $2500.After how many months will the cost to rent the computer equal the cost to purchase it?

**pre algebra**

The ball game took in $1,920 one Saturday. The number of $12 adult tickets was 15 more than twice the number of $5 child tickets. How many of each were sold?

**pre algebra**

Julie went to the post office and bought both $0.49 stamps and $0.34 postcards for her office's bills. She spent $62.60. The number of stamps was 20 more than twice the number of postcards. How many of each did she buy?