# Posts by brandon

Total # Posts: 1,073

**physics?**

A falling rubber ball of mass m hits the ground with a speed of v and bounces straight up again after a 20% speed loss during the collision. The magnitude of the impulse it receives from the ground is A 0.2mv B 0.8mv C mv D 1.8mv

**physics?**

The minute hand of a bedside clock is 2.5 cm long. In order for the clock to keep proper time, the minute hand should maintain an average angular velocity of

**Physics**

A rectangular plank with mass m kilograms measures x metres wide by y metres high. It is clamped at its very left edge, one third of the way down from the top, as shown. To keep the plank level, the clamp must exert a torque of

**physics?**

A heavy steel ball S is suspended by a string from a block of wood W, as shown in the sketch. The entire system is dropped from a height. Neglecting air resistance, the tension in the string is equal to A zero B the weight of S C the difference of the masses of S and W D the ...

**Physics**

An unknown mass is suspended by a string from one end of an uniform stick which has a mass of 120 g. In order to balance the stick, it must be supported one third of its length away from the mass. the unknown mass is therefore?

**Chemistry**

A tank contains Ar at 1.33 atm and Kr at 3.59 atm. We add enough Xe to give a total pressure of 6.3 atm. What is the partial pressure of the Xe?

**Chemistry**

A 3.43 L flask is filled with carbon monoxide at 27 °C until the pressure is 8.31 atm. Calculate the total pressure after 2.09 moles of carbon dioxide has been added to the flask. (R=0.082 L-atm/K mol)

**chemistry**

Calculate the partial pressure of propane in a mixture that contains equal numbers of moles of propane (C3H8) and butane (C4H10) at 20 °C and 505 mmHg. (R=0.082 L-atm/K mol)

**math**

Sonya spent 3/8 of her money and then had $15 left. How much money did Sonya originally have

**Math**

Using h(t)=gt^2+v0t+h0, where g= -16, h0= initial height, v0= initial velocity, and t= time A rocket is fired into the air from the top of a building that is 200 feet tall. The initial velocity of the rocket is 600 feet/sec. If necessary, round answers to the nearest hundredth...

**Physics**

Go ask Gregor

**math**

brenda is twice as old as warren. jim is 10 years older than warren. jim is 25 years old. write an equation using the variable b to represent brenda's age and the variable w to represent warrens age

**Spanish**

Te gustan Los coches pequenos?

**Math**

How do you do $1.00 for 6 lemons ?

**math pre calc**

well you minus 8^6 to the other side and solve for x

**calculus**

oh right it should be 3x^2(3-x)^4-4x^3(3-x)^3, mistyped that.

**calculus**

they're the same answer. you just simplified it.

**calculus**

product rule. F(x)= f(x)*g(x) F'(x)= f'(x)g(x)+f(x)g'(x) so your answer would be 3x^2(3-x)^4-4x^3(3-x)^2

**calculus**

mk, i graphed the bounded region and saw my mistake. but i got 17/15 for my answer instead. so did my professor still do it wrong? or did i miss some small detail?

**calculus**

Evaluate the integral ∫∫∫2xzdV bounded by Q. Where Q is the region enclosed by the planes x + y + z = 4, y = 3x, x = 0, and z = 0. Answer=16/15 Is this answer correct? cause i've tried doing this problem a bunch of ways and i never even get close to 16/15...

**Calculus**

I'm having trouble reversing the order of integration of ∫∫dxdy from a=0 to b=2(3)^(1/2) for x and c=y^(2/6) to d=(16-y^2)^(1/2) for y. I graphed the region of integration and that still doesn't really help me. i got approximately 7.9 for the ∫∫...

**college physics**

121.24 m/s

**math**

how many inches high is the box that holds 700 cubic inches?

**Physics**

a 1.0 N-weight is hanging at rest as shown. In each case, write in the magnitude of the unknown force. a) chain with a weight of 2.5 N has a 1.0 N hanging weight b) chain with a weight of .5 N has a 1.0 N hanging weight c) stretched elastic band with negligible weight has a 1....

**geometry**

the endpoints of AB are A(9,4) and B(5,-4) the endpoints of its image after a dilation are A1(6,3) and B1(3,-3) explain how to find the scale factor. Is there someone that can help me with this problem and explain foe me?

**geometry**

A blueprint for a house has a scale factor of 1:35. A wall in the blueprint is 3inches. What is the length of the actual wall? Can someone explain how to figure scale factor?

**geometry**

Thank you that is what I thought but then I was second guessing myself on changing to centimeters.

**geometry**

A microscope shows you an image of an object that is 80 times the actual size. Therefore, the scale factor of the enlargement is 80. An insect has a body length of 7 millimeters. What is the body length of the insect under the microscope? I know it's 560, but not sure if ...

**geometry**

Which type(s) of symmetry does the uppercase letter H have? my answer i believe is reflectional symmetry Which type of symmetry is shown by the lowercase letter w? my answer i believe is rotational symmetry. Could someone please check and explain.

**geometry**

What is the image of A(3,-1) after a reflection, first across the line y=3, and then across the line x=-1? I believe (3,-1) but not real sure, doesn't the x stay the same?

**geometry**

The coordinates of the vertices of triangle CDE are C(1,4), D(3,6), and E(7,4). If the triangle is reflected over the line y=3, what are the coordinates of the image of D? I think (3,-6), but not real sure.

**geometry**

Thank you I see what I did wrong.

**geometry**

In the graph below, point D is reflected across the y-axis. What are the coordinates of it's image? The graph looks like D is below the x-axis to the right 3 places from y-axis and down 1 place from x-axis. So would my answer be (3,1)?

**Math**

Hello Diana, Remember the three basic rules when dealing with logs: n * log(A) = log(A^n) log(A) + log(B) = log(A*B) log(A) - log(B) = log(A/B) Also note that log, and ln are both logarithms and interchangable, just with base 10 for log and base of nature exponent e for ln. ...

**trig**

Find the value of theta (in radians) corresponding to the point (6,-8)

**Math**

Matt has a deck of 20 cards. Of these 15 are numbers cards and 5 face cards. What is the probability of drawing a number card from the whole deck?

**PHYSICS-electricity & magnetism**

-e and +e respectively

**PHYSICS-electricity & magnetism**

An electric field exits inside a fluorescent tube of diameter 3.00cm. In one second, 2.00x10^18 electrons and 0.50x10^18 positive ions pass through a certain cross section. What is the current in the tube?

**Physics**

Three identical charges of 2.0 uC are placed at the vertices of an equilateral triangle, 0.15m on a side. Find the net force acting on each angle.

**geometry**

Sorry!

**geometry**

A slide 4.1 meters long makes an angle of 35 degrees with the ground. To the nearest tenth of a meter how far above the ground is the top of the slide. Could someone please explain don't want just answer would like to know how to do the work.

**geometry**

A large totem pole in the state of Washington is 100ft tall. At a particular time of day, the totem pole casts a 249ft-long shadow. Find the measure of <A to the nearest degree. Can someone please explain

**geometry**

4.1 is opposite the right angle and 35 degrees is on the longer leg and x is on the shorter leg. Does that seem to help? So is this still the same way to work the problem out? Thanks so much for your help!!

**geometry**

A slide 4.1 meters long makes an angle of 35 degrees with the ground. To the nearest tenth of a meter bow far above the ground is the top of the slide? sin=35 x/4.1 x=4.1 sin=35 not sure how to do this

**geometry**

The length of the hypotenuse of a 30-60-90 triangle is 12. Find the perimeter.

**science**

displacement vectors of 5km north, 3km east, 2km south, and 3km west combine to a total displacement of? 3km north 13km west 0km 2km south I think 13km west

**geometry**

An equilateral triangle has an altitude of 15m. What is the perimeter of the triangle. Could someone please explain how to find perimeter. I believe the answer to be 60 sq rt 3m

**fullerton**

A vertical container with base area measuring 12 cm by 18 cm is being filled with identical pieces of candy, each with a volume of 50.0 mm3 and a mass of 0.0200 g. Assume that the volume of the empty spaces between the candies is negligible. If the height of the candies in the...

**phyhsical science**

how much time is needed for a car to accelerate from 6.5 m/s to a speed of 22 m/s if the acceleration is 3.0 m/s/s?

**3rd grade Math**

If you put one whole and put it next to 1/5 then it would be bigger,so it would be 1 whole and 1/5 is greater than 1/4.

**geometry**

find the geometric mean of 275 and 11 275/x=x/11 x^2= 3025 x=sq rt 3025 now I'm not sure what to do.

**math**

Beth and her grandmother paid $23.00 for tickets to a play. An adult ticket costs $6.50 more than a child's ticket. What was the cost of Beth's ticket?

**physics**

If i have three resistors in parallel and series, then the first resistor (series) and the second resistor (parallel) should have the same average of the total voltage? is this true? i think it should

**physics**

If i have three resistors in parallel and series, then the first resistor (series) and the second resistor (parallel) should have the same average of the total voltage? is this true? i think it should

**geometry**

how do i figure out the length of one side of a triangle if I know one side is 40 meters, and the angle on one side is 90 degrees and the other side is 42 degrees?

**chemistry**

A copper foil is made from copper, absolutely free of impurities. Which term or terms could be used to describe this sample of copper

**geometry**

Can someone explain how you get the answer b/15. Given the proportion a/b=8/15, what ratio completes the equivalent proportion a/8=?/?. I'm not sure if there is an equation or step you use to get the answer.

**physics**

suppose that resting on your non-conducting desktop is a tiny piece of paper (m=0.08g) that has a charge of 4x10^-10C. You bring your comb 3 cm away from it and the paper jumps up to the comb. Give an approximate value for the charge of the comb. Does the comb carry an excess ...

**English**

In the story "The Pig" written by Barbara Kimenye can someone help me figure out what she introduces, develops, and how she resolves a major conflict. I believe it has something to do with not believing retirement was for him and his grandson brings him a pig which ...

**English**

I had some other questions posted do you think someone might be able to check my answers? They are posted by Jason, Kevin, and Robert, these are my brothers, they were trying to help me out. And Thanks again.

**English**

Thank you so mush!

**English**

Can someone please check my answers? 1)Passive voice adds directness to your writing. a)true b)false* 2)You should avoid unnecessary shifts in verb tense when writing. a)true* b)false

**English**

I could really use some help not very good at English but I am trying. Could someone please help.

**English**

1)Read the passage below from "No Dogs Bark" and select the one that best represents imagery in the story. a)"Now and then he seemed to sleep." b)"The old man backed ou to a thick wall and shifted load but didn't let it down fron his shoulders.&...

**Chemistry**

15.2

**history**

Quick strikes and movements during the darkness were used by: a. Francis marrion b. Peter francisco c. Crispus Attucks d. Caeser Bacon I think its b, not sure

**history**

The prussian soldier who helped train Continental soldiers was a. Marquis de Lafayette b. Baron Friedrich von Steuben c. George Rogers Clark d. Thaddeus Kosciuszko guess is B but not sure

**Math**

28 inches

**history**

The attack on fort Ticonderoga gave the colonists valuable a. ammunition b. prisoners of war c. intelligence information d. british war maps I believe its c but not so sure

**Chemistry**

How do you calculate the [H^+] and where did you get the -1E-6 from?

**Chemistry**

The pH of 0.15 mol/L of hydrocyanic acid is 5.07. Calculate Ka of hydrocyanic acid.

**chemistry**

Actually, if I may revise, How do I find n?

**chemistry**

Rather than criticize, I actually have a legitimate question about the problem posted above. DrBob, the structural formula for propene is C3H6 if I am not mistaken. But what I don't understand is how to incorporate that into PV=nRT?

**statistics**

3. Use the following SAT score data to answer the questions that follow. Gender Verbal Math M 600 690 M 610 550 F 490 800 F 680 610 M 520 540 F 680 660 M 650 700 M 600 560 F 550 560 M 490 390 F 530 530 M 560 560 F 630 590 F 510 520 M 710 740 F 550 560 M 690 620 M 700 700 M 540...

**physics**

The answer is 2.) +,0,0,-

**English**

2 questions what is the word down in this sentence? 1. Samantha rode her bike the hill. noun or adjective or adverb or verb 2. What is the word sky in this sentence? Suddenly, a rainbow appeared in the sky.

**math**

one is addition and one multiplication.

**math**

Interest is calculated with the following formula I=Prt What is the future value ( present value + interrst ) of this account? Present value is $600; interest is 6% Term is 12 years ( Enter your answer as dollars and cents. )

**science**

The mass would be the same

**math**

Thank you Steve

**math**

A team is made up of 6th 7th and 8th graders in the ratio of 234. How many 6th graders will be on a 36member team?

**world history**

what are 2 cause and effects of queen elizebeth the 1st dying

**math**

Meant to say 6 3/7 - 7 1/7 = - 1 2/7

**3rd grade math**

DIE

**Algebra 2**

x^4n - y^6n+2. Factor. Thanks.

**Algebra 2**

(x^2 + 6x + 9)-y^2 Factor. Thanks.

**8th grade math**

You add like terms. (3a+a)+(2a^2-a^2)= 4a+a^2

**science**

What would happen if blood entering the heart mixed with blood leaving the heart?

**Math please help**

A rectangular room has a perimeter of 36 feet.One side is 10 feet long.How long is side s?

**Math please help**

A rectangular room has a perimeter of 36 feet.One side is 10 feet long.How long is side s?

**Chemistry**

In a certain experiment, when light of wavelength 570 nm is directed on to the photocell, electrons are emitted at the rate of 6.6 10-13 Coulombs/sec. Assume that each photon that impinges on the photocell emits one electron. How many photons per second are striking the ...

**Chemistry**

In a certain experiment, when light of wavelength 570 nm is directed on to the photocell, electrons are emitted at the rate of 6.6 10-13 Coulombs/sec. Assume that each photon that impinges on the photocell emits one electron. How many photons per second are striking the ...

**statistics**

Listed below are the FICO scores of a simple random sample of United States adults. Do these scores appear to come from a population that has a normal distribution? Explain how you arrived at your answer and defend your conclusion. 708 713 781 809 797 793 711 681 768 611 698 ...

**statistics**

Listed below are the FICO scores of a simple random sample of United States adults. Do these scores appear to come from a population that has a normal distribution? Explain how you arrived at your answer and defend your conclusion. 708 713 781 809 797 793 711 681 768 611 698 ...

**Math**

where would you put the parentheses to make this true 124-6 x 0 + 15 = 34

**hvac**

5 lbs x 144 Btu / lbs = 720 Btu

**Physics**

A boy starts at rest and slides down a frictionless slide as in the figure below. The bottom of the track is a height h above the ground. The boy then leaves the track horizontally, striking the ground a distance d as shown. Using energy methods, determine the initial height H...

**Science 6th grade**

Scientists do their experimental tests more than once so they effects of chance errors.

**statistics**

The deli special lunch offers a choice of three different sandwiches, four kinds of salads, and five different desserts. Use the multiplication rule of counting to determine the number of different lunches that can be ordered using the deli special lunch option, if each ...

**Algebra**

m^2-5m-14=0. Solve using quadratic formula. Thanks.