Wednesday

September 28, 2016
Total # Posts: 1,045

**physics**

A 2.7 kg ball strikes a wall with a velocity of 7.8 m/s to the left. The ball bounces off with a velocity of 6.6 m/s to the right. If the ball is in contact with the wall for 0.19 s, what is the constant force exerted on the ball by the wall?

*November 8, 2012*

**physics**

A 74.0 kg ice skater moving to the right with a velocity of 2.58 m/s throws a 0.18 kg snowball to the right with a velocity of 24.4 m/s relative to the ground. (a) What is the velocity of the ice skater after throwing the snowball? Disregard the friction between the skates and...

*November 8, 2012*

**Pre calc**

A set of 500 values has a normal distribution. The mean of the data is 24 and the standard deviation is 2. Find the range about the mean which includes 50% of the data.

*November 4, 2012*

**Chemistry**

298/-8.64=-34.49 298=273+20

*November 1, 2012*

**Chemistry**

i thought i did

*November 1, 2012*

**Chemistry**

(1.080)(-8)=(265)(P) -8.64=265P 265p/ -8.64= -30.67

*November 1, 2012*

**Chemistry**

A pressurized can of whipped cream has an internal pressure of 1.080 atm at 25°C. If it is placed in a freezer at -8°C, what is the new value for its internal pressure (in atmospheres)? I did this but got a negative number that wasnt correct

*November 1, 2012*

**Chemistry**

A pressurized can of whipped cream has an internal pressure of 1.080 atm at 25°C. If it is placed in a freezer at -8°C, what is the new value for its internal pressure (in atmospheres)? So i tried (1.080)(-8)=(P)(265) and I got -30.67 but its no correct. What am I ...

*November 1, 2012*

**Chemistry**

So i tried (1.080)(-8)=(P)(265) and I got -30.67 but its no correct. What am I doing wrong?

*November 1, 2012*

**Chemistry**

A pressurized can of whipped cream has an internal pressure of 1.080 atm at 25°C. If it is placed in a freezer at -8°C, what is the new value for its internal pressure (in atmospheres)?

*November 1, 2012*

**chemistry**

Consider a mixture of air and gasoline vapor in a cylinder with a piston. The original volume is 70. cm3. If the combustion of this mixture releases 885 J of energy, to what volume will the gases expand against a constant pressure of 645 torr if all the energy of combustion is...

*October 22, 2012*

**math**

Assuming the sequense... _,2,_,_,27/4 Is geometric find the missing terms and the formula for t(n)

*October 18, 2012*

**Math 6th Grade**

I have to create a double number line graph and im not sure if i'm doing it right? Jenny can make 10 flower arrangements in 5 minutes. How many arrangements can she make in 6 min? 4 1/2 min? 3 min?. What is the unite rate?

*October 17, 2012*

**physics need help please**

There are 7 charges, each with q = -5 nC distributed on a circle with radius R=3cm. The center of the circle is at the origin. The charges are at angles 0o, 45o, 90o, 135o, 180o, -90o, and -45o. (Note: A charge at -135o is missing.) a) What is the net electric field at the ...

*October 17, 2012*

**physics need help please**

There are 7 charges, each with q = -5 nC distributed on a circle with radius R=3cm. The center of the circle is at the origin. The charges are at angles 0o, 45o, 90o, 135o, 180o, -90o, and -45o. (Note: A charge at -135o is missing.) a) What is the net electric field at the ...

*October 17, 2012*

**health**

It's D: For at least 60 minutes each day or almost everyday.

*October 16, 2012*

**Physical Science**

3. (a) How much work is done in raising a 50.0 kg crate a distance of 3.5 m above a storeroom floor? (b) What is the change of potential energy as a result of this move? (c) How much kinetic energy will the crate have as it falls and hits the floor?

*October 11, 2012*

**7th grade math ASAP quick please**

I know It doesn't matter anymore but the answers are 1.|3.12 2.|10.9 3.|15 4.|27

*October 8, 2012*

**Physics**

Need Help with physics! Two cars drive on a straight highway. At time t = 0, car 1 passes mile marker 0 traveling due east with a speed of 17.0 m/s. At the same time, car 2 is 1.3 km east of mile marker 0 traveling at 30.0 m/s due west. Car 1 is speeding up with an ...

*October 4, 2012*

**Physics **

How long does it take an automobile traveling 74.3 km/h to become even with a car that is traveling in another lane at 58.3 km/h if the cars’ front bumpers are initially 114 m apart? Answer in units of s

*September 24, 2012*

**probability**

A pair of fair dice is rolled. What is the probability of at least one 3 cast

*September 21, 2012*

**physics**

A diver jumps off a diving board with a speed of 25m/s he returns to the water after 3s. At the top of his dive describe his velocity and his acceleration?

*September 19, 2012*

**algebra**

Determine whether y varies directly with x. If so find the constant of variation k and write the equation. x y 7 11 8 13 9 15 10 17 Can someone please help me and explain

*September 19, 2012*

**algebra**

Thank you that is what I finally figured but wasnt sure about the graph

*September 18, 2012*

**Calculus**

Find a linear function whose graph is the plane that intersects the xy-plane along the line y=2x+2 and contains the point (1,2,2).

*September 17, 2012*

**Calculus**

Find a linear function whose graph is the plane that intersects the xy-plane along the line y=2x+2 and contains the point (1,2,2).

*September 17, 2012*

**algebra**

Can someone please explain this problem to me?

*September 17, 2012*

**algebra**

question; you research the average cost of a tank of gasoline for a certain type of car for several recent years to look for trends. the table shows your data. what is the equation for a line of best fit? how much would you expect to pay for a tank of gas in the year 2024? ...

*September 17, 2012*

**Math**

John's high score on the Asteriud Game was 326,700. Mike's high score was 418,200. Rebecca just played the game and her high score was halfway between John's and Mike's. What was Rebecca's score?

*September 17, 2012*

**Calculus**

Find a linear function whose graph is the plane that intersects the xy-plane along the line y=2x+2 and contains the point (1,2,2).

*September 17, 2012*

**health**

It's A.

*September 7, 2012*

**algebra**

Could someone please check my work. what is the slope of the line that passes through the given points?(2,12( and (6,11) -1/4 (my choice) 1/4 4 -4 My work: 11-12/6-2=-1/4 what is the slope of the line that passes through the given points? undefined( my choice) 0 -2/3 -3/2 My ...

*September 7, 2012*

**algebra**

Oh okay thanks for explaining

*September 4, 2012*

**algebra**

pi*7=7*pi would this be associate property of multiplication

*September 4, 2012*

**algebra**

Okay I get it I was close just didn't now what to do with the negative sign. Thanks for helping

*September 4, 2012*

**algebra**

-(4h-1)/1+h; h=2 the 4h-1 is on top of 1+h please can someone explain

*September 4, 2012*

**algebra**

I see where I made my mistake I took -72 + 2. Thank you.

*September 4, 2012*

**algebra**

9[9-8x]=2x+3 Please can someone explain

*September 4, 2012*

**algebra**

complicated but I think I understand thanks so much

*September 4, 2012*

**algebra**

[-4b-8]+[-1-b^2]+2b^3; b=-2 please can someone explain

*September 4, 2012*

**math**

solve the absolute value 3/2x+4/-1=11 // stands for brackets could someone explain /2x+7/<=27 /2x+10/>26 /2x-1/=3 I do not understand if someone could help

*September 3, 2012*

**Science**

If while the mass was hanging from a spring scale you pulled up sharply on the scale what do you think would happen to the reading on the scale?

*August 30, 2012*

**Science**

So would the answer be 50?

*August 30, 2012*

**Science**

What is the force of 10m/s squared acceleration and 5 kg mass?

*August 30, 2012*

**English 11**

#5 I believe is these colonies are, and of right ought to be, free and independent states #6 I believe is a list if grievances is attached

*August 29, 2012*

**math**

Thank you for explaining

*August 27, 2012*

**math**

solve the inequality 8/x+3/4/<2 used / / for brakets around x+3/4 possible answers x<-1 or x>-1/2 -5/32<x<5/32 -1<x<-1/2 x<-5/32 or x>5/32 not looking for just the answer but help on how to do it

*August 27, 2012*

**math**

Thank you Steve

*August 27, 2012*

**math**

Solve the equation check for extraneous solutions 6/6-4x/=8x+4 I used/ / for the brackets posssible answers x=1 x=5/2 or x=2 x=5/2 x=5/2 or x=1 Not looking for just the answer, would like to know how to get it.

*August 27, 2012*

**math**

Thank you for showing me how to do these really helps alot.

*August 26, 2012*

**math**

Can someone please help with solving compound inequality. !.) 6x-4<-34 or 3x+10>10 2.) -2<=2x-4<4 I'd appreciate if someone can explain not looking for just answer. Thank you

*August 26, 2012*

**algebra2**

solving compound inequality can someone please help I don't understand.

*August 26, 2012*

**algebra2**

-5y-9=-(y-1) how would one solve this problem, I'm not sure

*August 24, 2012*

**math**

use properties of real numbers to rewrite the expression (3/5)(5/3).. dont understand.

*August 23, 2012*

**math**

use properties of real numbers to rewrite the expression (3/5)(5/3).. dont understand.

*August 23, 2012*

**algebra**

where would you graph 10/7 on a number l0/7 on a number line? i took 10/7 made it 1 3/10 and think youd graph between 1 and 2 on graph, but not sure.

*August 23, 2012*

**HEALTH**

No, It's B.

*August 22, 2012*

**math**

explan the reasoning

*August 21, 2012*

**math**

The diagram represents of a fifths fraction strip. Sketch the whole strip. Explain your reasoning.

*August 21, 2012*

**health**

Correct.

*August 11, 2012*

**HEALTH**

It's A.

*August 8, 2012*

**health**

It's A.

*August 4, 2012*

**Health**

D is wrong. :(

*August 1, 2012*

**english**

Identify the simple predicate in the following sentence. Our basketball team will play against Wilson High School on Friday night.

*July 30, 2012*

**math**

if my cross is 3 3/8 inches tall and 2 1/2 inches wide how wide should it be if its 7 1/2 inches tall

*July 27, 2012*

**Calculus**

[((cotx)^(1/3))((csc^4(x))] i dont understand how to integrate the first part because it should be either even or odd, but this is neither.. help!

*June 10, 2012*

**Calculus**

integral of cscx^(2/3)(cot^3)x i know that cot^2x is csc^2(x)-1, but i just don't understand how to solve the cscx^(2/3), any help? i also know that its trig integrals/substitution...

*June 10, 2012*

**Chemistry**

brOH

*June 6, 2012*

**physics?**

A body in vertical free fall covers half its total distance in the last second of its fall. The total time taken by the body to cover the entire (whole) path is A 1.414 s B 1.732 s C 2.414 s D 3.414 s

*May 21, 2012*

**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

*May 21, 2012*

**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

*May 20, 2012*

**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

*May 20, 2012*

**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 ...

*May 20, 2012*

**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?

*May 20, 2012*

**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?

*May 3, 2012*

**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)

*May 3, 2012*

**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)

*May 3, 2012*

**math**

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

*April 16, 2012*

**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...

*April 14, 2012*

**Physics**

Go ask Gregor

*April 14, 2012*

**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

*April 12, 2012*

**Spanish**

Te gustan Los coches pequenos?

*April 12, 2012*

**Math**

How do you do $1.00 for 6 lemons ?

*March 25, 2012*

**math pre calc**

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

*March 25, 2012*

**calculus**

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

*March 25, 2012*

**calculus**

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

*March 25, 2012*

**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

*March 25, 2012*

**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?

*March 25, 2012*

**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...

*March 25, 2012*

**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 ∫∫...

*March 21, 2012*

**college physics**

121.24 m/s

*March 19, 2012*

**math**

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

*March 16, 2012*

**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....

*March 11, 2012*

**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?

*March 7, 2012*

**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?

*March 6, 2012*

**geometry**

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

*March 6, 2012*

**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 ...

*March 6, 2012*

**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.

*March 5, 2012*