Saturday

April 19, 2014

April 19, 2014

Total # Posts: 218

**physics**

A bookshelf is at rest in a room. A force of 35.0 newtons is applied to a bookshelf. If the floor imparts a frictional force of 2.90 newtons, what is the net force acting on the bookshelf?

**English**

B

**Phyics**

An object in simple harmonic motion has an amplitude of 0.202 m and an oscillation period of 0.620 s. Determine the maximum speed of the motion.

**math**

can the commutative property be used for subtraction? explain

**math**

how can addition properties help me add whole numbers?

**Phyics**

A 17-kg sled is being pulled along the horizontal snow-covered ground by a horizontal force of 28 N. Starting from rest, the sled attains a speed of 2.3 m/s in 10 m. Find the coefficient of kinetic friction between the runners of the sled and the snow.

**Phyics**

A sprinter explodes out of the starting block with an acceleration of + 2.43 m/s2, which she sustains for 1.10 s. Then, her acceleration drops to zero for the rest of the race. What is her velocity at (a)t = 1.10 s and (b) at the end of the race?

**math**

which number is this rounded too, the nearest ten or hundred? 557 rounds 560

**math**

round to nearest hundred. 113, 279, 367

**Math help**

A person who weighs 130 pounds can burn about 300 calories per hour skateboarding. Write a function that relates the calories burned, c, to the number of hours, h, spent skateboarding. Identify the independent and dependent variable. Create a function table for values of h equ...

**7th math**

Thanks!!!

**Math help**

Thank you both of you guys. Details helped a lot. I was stressing on this one.

**Math help**

55h + 275 = 440 Do I subtract 55 from 275 ?

**Reading math**

Two times the number of trees wich is 2n right? Thanks!!!!!!!!!!!!!!!!!!!!!

**Reading math**

on January they sold 139 more Doughlas firs than Noble firs. The toal trees sold was 377. which of these is right for me to solve it?? n-139=377 n+139 = 377 2n +139 =377 2n+139 = 377 I think it is the first one??

**math subtraction**

My brother didn't explain what he was asking enough.

**math subtraction**

Complete function table. Then I need to write a rule for the function. I typed it as it shows on the function colum box. Do I subtract to get the missing number ? Like -3 Input doesn't have anything next to it in the output column.

**math help plesase????**

A person who weighs 130 pounds can burn about 300 calories per hour skateboarding. Write a function that relates the calories burned, c, to the number of hours, h, spent skateboarding. Identify the independent and dependent variable. Create a function table for values of h eq...

**Math help Geometery**

Yes you nailed it. :))) Thank you. And for not giving up on me. I thought you did. Thank you :))

**Math help Geometery**

Are the parallel bases AB and CD? yes

**Math help Geometery**

Your right of course on the shape. I can not find the exact shape name. I will figure it out. But if you can tell me when the shape has numbers, not degrees, on the sides what do I do with them? If I have angle D 86 degrees, Angle C 41 degrees and angle A 133 degrees. I add th...

**Math help Geometery**

Ok, sorry not a trapezoid. Do you normally !!! this to kids?

**Math help Geometery**

Oh and nothing between DC or between BC. Shape looks like a trapezoid.

**Math help Geometery**

AD and BC are parallel The short base parallel is AD with 6 in the middle, but angle D has 86 degrees. BC long base paralle has no number but angle c is 41 degrees. The side leg AB has a number 10. I took out the 133 degrees on angle A

**Math help Geometery**

AD and BC are parallel The short base parallel is AD with 6 in the middle, but angle D has 86 degrees. BC long base paralle has no number but angle c is 41 degrees. The side leg AB has a number 10. I took out the 133 degrees on angle A

**Math help Geometery**

AD and BC are parallel The short base parallel is AD with 6 in the middle, but angle D has 86 degrees. BC long base paralle has no number but angle c is 41 degrees. The side leg AB has a number 10. I took out the 133 degrees on angle A

**Math help Geometery**

AD and BC are parallel The short base parallel is AD with 6 in the middle, but angle D has 86 degrees. BC long base paralle has no number but angle c is 41 degrees. The side leg AB has a number 1o, but A has angle 133 degrees. Make sense?

**Math help Geometery**

I understand the degrees problem, but confused on the non degree numbers I mentined above? 10 and 6 around the shape?

**Math help Geometery**

I got 260 degrees

**Math help Geometery**

I got 100 degrees for the 4th angle, is this right? Also, the numbers around the shape I don't do anything for them?

**Math help Geometery**

If, I ahve a trapezoid with two angles Angle 86 degrees and 41 degrees and angle A 133 degrees then,side b 10 Short base 6 How do I solve to get angle B?

**Math help**

Sorry second half up there is the other trapezoid.

**Math help **

I am so lost I have a problem. Two congruet figures. First trapezoid: 1 side b is 10 1 short base prarallel 6 Angle D 86 degrees Angle C 41 degrees Angle B ? Angle A ? Other angle J is 133 degrees Angle M ? Angle K ? Side d leg 17 Angle L ? long Base parallel 16 I know this i...

**Math Geometery**

Thank you Mr. Knights so mych. You explained it to me well.

**Math Geometery**

Is it possible to have more than one vertical line of symmetry? Why???

**physics**

A student, crazed by the first physics Midterm, uses a pushing force of 80 N angled at 70° to push a 5.0 kg book across the frictionless ceiling of his room. a. What is the block's acceleration? b. What is the force of the ceiling on the book?

**Economics**

Joe's utility over consumption and leisure is given by c^(1/2)+@l^(1/2), where @ is a positive constant. Find and graph Joe's labor supply.

**Algebra**

find least common denominator for these fractions 5/7 and 4/6

**Math**

Which of the following choices is correct? A. 0.43<4/5 B. 2/3<.07 C. 1/2<.09 D. 1/3>.35

**skyline**

Thanks, Writeacher (Very Helpful). I had an idea this was the answer.

**skyline**

a scale model of a car is 8 inches long. the actual car is 12 feet long. what is the scale of the model?

**Calculus**

Find the area between the following curves y1= x2−4x+3 y2=−x2+2x+3

**Physics**

a 4 kg block is being pulled by a string at a constant speed on a surface with coeficient of kinetic friction of .3. If the string is at an angle 45 degrees above the horizontal, what is the magnitude of the force F(also known as the string)?

**Physics**

a 4 kg block is being pulled by a string at a constant speed on a surface with coeficient of kinetic friction of .3. If the string is at an angle 45 degrees above the horizontal, what is the magnitude of the force F(also known as the string)?

**Physics**

a 4 kg block is being pulled by a string at a constant speed on a surface with coeficient of kinetic friction of .3. If the string is at an angle 45 degrees above the horizontal, what is the magnitude of the force F(also known as the string)?

**Geometry**

Where can the lines containing the altitudes of an obtuse triangle intersect? I. inside the triangle II. on the triangle III. outside the triangle A)I only B)I or II only C)III only D)I, II, or III PLEASE HELP ME ASAP!!!!

**Geometry**

its okay I just got the answer from someone elses answer. thanks anyways though. :)

**english literature**

Came to America to find freedom to worship and the Promised Land =a.)The North--Puritanism b.)The South---Gentlemen Planters c.)Both

**math**

a frog sat on a number line, it was on the number 18. it made two equal hops and anded at 0. where did it land first?

**math**

identify the two numbers less than 20 with the most factors

**Physics**

Two blocks of masses m1 = 2.00 kg and m2 = 4.50 kg are each released from rest at a height of y = 5.80 m on a frictionless track, as shown in the figure below, and undergo an elastic head-on collision. (a) Determine the velocity of each block just before the collision. Let the...

**Physics**

A 10.0 g object moving to the right at 19.0 cm/s makes an elastic head-on collision with a 15.0 g object moving in the opposite direction at 30.0 cm/s. Find the velocity of each object after the collision.

**calculus**

A golf ball of mass 0.05 kg is struck by a golf club of mass m kg with a speed of 50m/s will have an initial speed of v(m)=83m/(m+0.05) m/s. show that v'(m)>0 and interpret this result in context with the application. Compare v'(0.15) and v'(0.20) in context of ...

**Math**

You and a friend roll a pair of dice. The game is over either when you receive a sum of nine or when your friend receives a sum of six. Assume that you start first. What is the probability that you win. Note: For any round, if you receive a sum that is not nine AND your friend...

**chem**

You have to multiply the 3.7e10 by the 16mCi, and then divide by 1000. Disintegrations/s, and bq will be the same. Remember sig figs....

**physics**

Compute your average velocity in the following two cases: (a) You walk 73.6 m at a speed of 1.79 m/s and then run 73.6 m at a speed of 4.31 m/s along a straight track. (b) You walk for 1.00 min at a speed of 1.79 m/s and then run for 1.30 min at 4.31 m/s along a straight track.

**geometry**

in segment pt, l is the midpoint of pa and a is the midpoint of pn. if pn = 17 and la = 3.5, what is the length of nt?

**chemistry**

help me find which reactant is the limiting reactant when 74 g NaOH and 44 g CO2 are allowed to react when the equation is (2NaOH+1CO2=Na2CO3+1H2O)

**physics**

Speed of sound = 1498 m/s The sound takes 1.95 s to travel from the boat to the bottom and back. Half of this time is how long it takes to reach the bottom. So 1.95s/2 = time to travel from boat to the bottom. velocity = distance / time. since you now know time and velocity yo...

**Physics**

To move a crate across a rough floor, you pull on it at an angle of 21 degrees above the horizontal. How much force is needed if the mass of the crate is 32kg and the coefficient of static friction between the crate and floor is 0.57

**math**

Initial balance = 2,539.78 withdraw (out of account) = -150.00 credit (into account) = 6.19 total change in the account = -150 + 6.19 = -143.81 Initial balance - total change = 2,539.78 - 143.81 = final balance

**physics**

A 65.0-kg runner has a speed of 5.20 m/s at one instant during a long-distance event. (a) what is the runner's kinetic energy at this instant? (b) if he doubles his speed to reach the finish line, by what factor does his kinetic energy change

**Chemistry**

What is the concentration of an HCl solution if 23.1 mL of HCl are needed to neutralize completely 35.0 mL of 0.101 M Ba(OH)2 I cannot get the right answer (Macic)(23.1mL)=(0.101M)(35.0mL) Macid = .153

**chemistry**

(Macic)(23.1mL)=(0.101M)(35.0mL) Macid = .153

**chemistry**

What is the concentration of an HCl solution if 23.1 mL of HCl are needed to neutralize completely 35.0 mL of 0.101 M Ba(OH)2 I cannot get the right answer

**6th grade english**

The verb is crap

**Tragedy of Julius Caesar**

is cassius is honestly opposed to tyranny

**MATH**

Let ones=x tens=y hundreds=z thousands=a a+x+y+z=15 x=1+y y=a+1 z=x+a y=3 x=1+(3) x=4 (3)=a+1 a=2 z=(4)+(2) z=6 2634

**Math**

distance=rate*time d=rt wind speed=w plane spee=180+w d=[(180+w)+w]*3 With wind d=[(180+w)-w]*4 Against wind [(180+w)+w]*3=[(180+w)-w)*4 (180+2w)3=180*4 540+6w=720 6w=180 w=30 The wind speed is 30 mph. The plane in still air is 180+30, or 210.

**math**

Let Ones digit=x Tens digit=10y Hundreds digit=100z 100z+10y+x=? z=6 z-3=y x=y 6-3=y=3=x z=6 y=3 x=3 100(6)+10(3)+3= 633

**Science**

M1V1=M2V2 (1.000x10^3 mL)(.00383 M)=x(25mL) x=.1532 M

**math**

403

**Body systems/ terminology**

A. Hormones control things to the extent of the speed of metabolism, levels of sugar in the bloodstream, etc. Although D is also true, it is not the best description.

**math**

The probability for the first is 6/10 (3/5). The probability for the second is 5/9. Multiply them for your answer, 1/3.

**Science**

2Na+2H2O-->2NaOH+H2 2 mL H2O*(1g H2O/1 mL H2O)=2 g water Since this is more grams than the sodium, and there is a one to one ratio, the sodium is limiting. 1.2g Na*(1 mol Na/22.99 g Na)*(2 mol NaOH/2 mol Na)*(40 g NaOH/1 mol NaOH) 2.1 g NaOH

**English**

yellow

**chemistry**

(5.40M)*x=(0.150L)(0.510M) x=0.0142 L

**chemistry**

4NH3+5O2-->4NO+6H2O 4.5g*(1 mol/32g)*(4 mol/5 mol)*(16.03g/1 mol) 1.8g Ammonia

**math**

a) The probability for one or the other is 10/4280 (1/428). For one of the two, add each of their probabilities (1/428)+(1/428) gives an answer of 1/214. b) The probability for any one child is 4/4280 (1/1070). Adding together the three children's probability (1/1070)+(1/1...

**Chemistry**

Energy=(25.0g)(2.10J/g)(93+10) Energy=5407.5 J*(1 KJ/ 1000 J) Energy= 5.41 KJ

**Chemistry**

2H2O(g)-->2H2O(l) -88.0KJ 2H2O(l)-->2H2O(g) 88.0 KJ +2H2O(g)-->O2+2H2 483.6 KJ 2H2O(l)-->O2+2H2 571.6 KJ 571.6 KJ/mol

**Chemistry**

Density= mass/volume 63.3g/45.0 mL 1.4 g/mL

**calculus**

10(x+h)^2+9(x+h)+10-(10x^2+9x+10) 10(x^2+xh+h^2)+9x+9h+10-10x^2-9x-10 10x^2+10xh+10h^2+9h-10x^2 10xh+10h^2+9h

**MATH HELP!!!!**

let x=pile one x-10=second pile x/2=third pile x+(x-10)+(x/2)=3000 2x+x/2=3010 4x+x=6020 5x=6020 x=1204 The third pile is x/2, so the third pile has 1204/2, or 602 books.

**Chemistry**

The M stands for the unknown element; it binds to the Bromine. Bromine has a -1 charge, and there are three, it is highly likely that the element is Aluminum or Boron. 27.765 g MBr3-2.809 g M=24.956 g 3Br- 24.956 g Br* (1 mol Br/239.7 g)= .104 mol Br This is the same number as...

**chemistry**

density=mass/volume 5.00cm*3.00cm*1.00cm=15.00cm^3 (or 15.00 mL) 52.5g/15.00 mL= 3.50 g/mL

**Animal Skeletal and Muscular Systems**

1. b 2. c 3. d 4. a 5. b 6. d 7. a 8. c 9. d 10. c (? Thats how many for humans) 11. d 12. a 13. d 14. c 15. d 16. c 17. c 18. d 19. a 20. b

**math**

It has been determined that 30% of students at a certain high school own a cell phone. If 95 students are randomly selected determine the probability that exactly 20 students own a cell phone. *if using a calculator show syntax used*

**math**

A company has two factories that manufacture tires. Suppose 65% of the tires are manufactured in factory 1 and 35% are manufactured in factory 2. In factory 1, 5% of the tires are defective. In factory 2, 2% of the tires are defective. a) Determine the probability that a defec...

**math**

A multiple-choice test has 10 questions. Each question has 5 choices. If a student answers each question by guessing randomly, find the probability that the student gets: a) at most 4 questions correct b) at least 7 questions correct Please show your work.

**math**

A committee of 4 is chosen from a group of 10 women and 6 men. Determine the probability that at least 2 women are on the committee. Please show your work.

**math**

What is the 8th term of (3x-1/2y)^10

**math**

Solve the following equations algebraically for n. Show your working using factorial notation. a) n!/3!(n-2)! = 12 b) 8Pn = 6720

**math**

thank you!

**math**

There are 6 boys and 8 girls in a group of students. Calculate the number of ways that a committee of 3 students which has at least 1 girl can be selected from the group. Please show your work.

**math**

thank you so much!

**math**

There are 6 boys and 8 girls in a group of students. Calculate the number of ways that a president, vice-president and treasurer can be selected. Please show your work.

**math**

thank you :)

**math**

A car license plate consists of 6 characters. The first 2 characters are any letter. The last 4 characters are odd numbers from 1 to 9 inclusive. How many different license plates are possible? Please show your work.

**math**

thank you so much. how come it wouldn't be 22P3*10P3?