# Posts by Courtney

Total # Posts: 809

**Physics**

You grabbed a power drill that claims it can reach 2234 rpm in 0.8 s. How many revolutions does the drill make in 0.8 s?

**Physics**

You are tasked with designing a roller coaster ride with a radius of curvature of 6.0 m. What minimum speed must the roller coaster have at the top of the circle so that the passengers experience a sense of "'free fall"?

**Physics**

THANK YOU!

**Physics**

A 7150 kg truck traveling east at 5 m/s collides with a 1650 kg car traveling 30 degrees south of west at 20 m/s. After the collision at what angle do the two vehicles move. Express you answer in degrees from the positive x-axis. Use a coordinate ...

**Physics**

Many thanks!

**Physics**

The scientific notations should say 2.34 x 10^-26; 9.11 x 10^-31; 4.0 x 10^7; 4.0 x 10^-24; sorry about that.

**Physics**

The carbon isotope 14C is used for carbon dating of objects. A 14C nucleus can change into a different kind of element, a neighbor on the periodic table with lower mass, by emitting a beta particle – an electron or positron – plus a neutrino or an anti-...

**Physics**

A 3 kg block travels along a horizontal surface with a coefficient of kinetic friction of 0.26 at a speed of 7 m/s. After sliding a distance of 1.0 m the block makes a smooth transition to a ramp with a coefficient of kinetic friction of 0.26. How far up the ramp ...

**Physics**

Thanks!

**Physics**

An 8 kg block is shot up an incline of 300with an initial speed of 2.8 m/s. How far up the incline will the block travel if the coefficient of friction between it and the incline is 0.18? Hint: Express the height above the ground that the block is above the incline...

**Physics**

A car going 15 m/s is brought to rest in a distance of 3 m as it strikes a pile of dirt. How large a force is exerted by the seatbelts on a 90 kg passenger as the car is stopped?

**Physics**

A 60 kg block slides along the top of a 100 kg block. The lighter block has an acceleration of 3.7 m/s2 when a horizontal force F= 350 N is applied. Assuming there is no friction between the bottom 100 kg block and the horizontal frictionless surface but there is ...

**Physics**

"Two blocks lie on a triangle as shown in the figure. Block m has a mass of 8 kg and block P has a mass of 21 kg. Assume the inclines and pulleys are frictionless find the tension in the string." The two blocks are on opposite side of an isosceles ...

**Physics**

Thank you

**Physics**

My apologies, the degrees copied as zeroes. It's 30 degrees, 45 degrees.

**Physics**

Let vector A = (6.0 m, 300 south of east), vector B = (13.9 m, north), vector C = (5.0 m, 450 south of west). Find the magnitude of vector D = A+B+C?

**Physics**

A brown road runner is standing still pecking at soil looking for worms. Suddenly, a black road runner travelling at a constant speed of 9.25 m/s, overtakes the brown roadrunner. The brown road runner notices that the other one has a worm in its mouth and ...

**Forensic Science**

If there are 45 drops of alcohol/mL, and the density of alcohol is 0.789 g/mL, what is the blood alcohol concentration of your unknown sample?

**Math1**

There are 5 pencils in each box how many pencils are in 85 boxes

**geometry**

the measure of one interior angle of a parallelogram is 50 degrees more than 4 times the measure of another angle. find the measure of each angle.

**Algebra**

For the school play, one adult ticket costs $10 and one student ticket cost $6. Twice as many student tickets as adult tickets were sold. The total receipts were $3 300. How many of each kind of ticket were sold?

**math**

the battery lifetime is normally distributed for large samples with a standard deviation of 70 days. if 16% of the batteries have a lifetime of 850 or higher, what is the average battery life?

**Reading**

B?

**Reading**

9. As you're revising an essay, you write down several sentences to describe your intended readers. Why should you do this? To make sure you're writing what you know, not what you believe B. To ensure that you're instructing your audience adequately C. To ensure ...

**Grade 8 Lang Arts**

He says it

**social studies**

the u.s superme court ruled against the tariff

**Physics**

An astronaut throws a ball with mass m to the right with speed v. It strikes the wall of the space station and rebounds, moving left with a speed V/2. What was the magnitude of the impulse of the ball caused by the collision?

**Math**

A box contains some white balls and some blue balls. There are 5 more blue balls than white balls. One ball is removed at random and not replaced. A second ball is then removed at random. The probability that the balls are different colours is 52/105. Find the probability that...

**Math**

How is it 0.8? What is the working out?

**Math**

A box contains some red balls and some blue balls. There are four more blue balls than red balls. A ball is removed at random, replaced and a second ball randomly removed. The probability that the two balls are different colours is 21/50. How many balls of each colour are in ...

**Science**

A screwdriver with the one similar shaft in a 4 cm handle is used to tighten a screw the mechanical advantage is

**College algebra**

2.8

**SOCIAL STUDIES 1 QUESTION PLZ HELP ASAP**

How did European affect Africa during the 18 hundreds how did Africa Africans respond in the 1900 Plzzzzzz help I swear I have read my text read a link about but I still don't understand plz help!!!!!#

**Language art**

Consider the main characters from " The Stolen Day and the night the bed fell in a paragraph discuss which character learns the most and which one learns the least. PLZ ANSWER ASAP and yes I have read both stories

**SOCIAL STUDIES**

I understand that part but I don't understand what's written look plz can u just tell me I have been working really hard plz I'm not lie in just help me or can you help me on my language art question

**SOCIAL STUDIES**

What? I didn't understand

**SOCIAL STUDIES**

Idk I just read it and nothing Pl ms.sue help

**SOCIAL STUDIES**

Oooooooh ok thank you ok ok last one how did the European affect Africa during the 1800s how did the Africans respond in the 1900s plz help I'm so sorry for the bother but plz help

**SOCIAL STUDIES**

OK thank you so much can you also answer this one. what role do women play in the economy of West and central Africa. I swear I already read my text and I got nothing

**SOCIAL STUDIES**

In what areas of North Africa do the majority of the people live and why? I know that they live by the Nile river but why is what don't know plz help I have been doing everything only come here if it's important plz help thank you

**Physical Science**

You drop a water balloon off of a tree branch, and you time the drop time at Δt = 0.8 sec, from the instant you drop it to the instant it impacts the sidewalk. What is the height of the tree branch?

**Chemistry**

If the density of carbon is 3.51 g/cm3, and you have a small diamond (pure carbon) that has a mass of 0.0270 grams, what is the volume?

**geometry**

SM=3x−4, and RN=9x−20. Find the value of x. A. 16 B. 4 C. 12 D. 8

**geometry**

Two sides of a triangle have lengths 4 and 7. Which of the following can NOT be the length of the third side? A. 4 B. 7 C. 11 D. 5

**geometry**

The lengths of two sides of an isosceles triangle are 8 and 10. The length of the third side could be? A. either 8 or 10 B. 6, only C. 8, only D. 10, only

**Economics**

Suppose you are a producer of friendship bracelets. How would the following events affect your/the market's willingness and ability supply friendships bracelets? Match the event on the left to the proper determinant on the right. 1. The price of friendship bracelets ...

**Algebra**

7594

**Math**

You have tow ropes one 14inches the other 23 inches if you if you need three feet of rope what do you do use RDW to solve

**English**

Sadly yes that's how cruel the world is

**Calculus**

Find the equation of the line tangent to the curve y=(x^2+3)^1/2 that is perpendicular to the line 2x-y+7=0

**Trig**

Use the Law of Cosines to determine the indicated angle θ. (Assume a = 17, b = 10, and c = 20. Round your answer to one decimal place.)

**English**

The MLA format for citing an entire website includes A. an article title. B. source from which you found the website. C. electronic publication information. D. author's apparent credibility.

**English**

Which type of Internet resource would be the most reliable in providing accurate information? A. A general reference site such as Encyclopedia B. An email you received from your instructor C. An email listserv D. An online newsgroup dedicated to your topic

**English**

It's necessary to use a/an _______ when a quotation is introduced by a verb. A. quotation mark B. comma C. ellipse D. colon

**geometry**

A 25 meter ladder is leaned against a tall building. If the ladder makes a 30 degree angle with the ground, how high up on the building (in meters) does the ladder fall?

**Physics**

Suppose at one point along the Nile River a ferryboat must travel straight across a 1.29-mile stretch from west to east. At this location, the river flows from south to north with a speed of 2.58 m/s. The ferryboat has a motor that can move the boat forward at a constant speed...

**READING ASAP ASAP PLEASE HELP ME!!!!!!!!!!!!!!!!!!**

Thanks guys!!

**READING ASAP ASAP PLEASE HELP ME!!!!!!!!!!!!!!!!!!**

what about 2?

**READING ASAP ASAP PLEASE HELP ME!!!!!!!!!!!!!!!!!!**

On #1 I meant to put A.

**READING ASAP ASAP PLEASE HELP ME!!!!!!!!!!!!!!!!!!**

CAN YOU CHECK IF I"M CORRECT? *=My answer. Which is the best example of the use of rhyme? A.the beat of the drum B.Fresh green grass C. A wild little girl* D.The kindness of strangers 2. What is the best example of a simile? A.Mary's shout rattled the window. B. Her ...

**geography**

thanks you!

**geography**

Who invented T.V's Phones, and computers?

**SCIENCE ASAP HELP PLEASE**

So is the answer D???

**SCIENCE ASAP HELP PLEASE**

which of the following features make earth and venus similar to each other ? A . their size and mass b. their rates of rotation c. their atmospheres d. their directions of rotation****

**Physical Education**

never mind I got it

**Physical Education**

Mandy wants to win the local youth tennis tournament next fall. Her coach has said that her serve is powerful enough, but she suggests Mandy train with a jump rope to improve her ability to cover more ground on the court when she’s playing. Why would her coach suggest ...

**MATH NEED HELP ASAP!!!!!**

Ok Ok... take it easy

**MATH NEED HELP ASAP!!!!!**

So I'm wrong

**MATH NEED HELP ASAP!!!!!**

so am i correct?

**MATH NEED HELP ASAP!!!!!**

I think B

**MATH NEED HELP ASAP!!!!!**

Henry's current age is 10 times Justin's current age. in 6 years,Henry's age will be 4 times Justin's age. Which system of equations can be used to calculate H Henry's current age J Justin's current age? A. J=10h j+6=4(H+6) B.J=H+6 J+4=H+10 C.H=10J H+6=...

**Math ASAP ASAP!!!!!**

yayaayay thanks Damon :)

**Math ASAP ASAP!!!!!**

Ms.Sue

**Math ASAP ASAP!!!!!**

IS the answer 400?

**Math ASAP ASAP!!!!!**

Ok But what number do i have to add

**Math ASAP ASAP!!!!!**

Earl earns a weekly salary of $150 plus 20% of amount of his sales for the week. Last week he earned $230. The equation below can be used to find "s" the amount of his sales in dollars last week 230=150+0.2s What was the amount of Earl's sales last week? A.$180 B...

**Math/Physics**

Lil decides to estimate the height of the Empire State Building. She measures the angle θ of elevation of the spire atop the building as 19°. After walking x = 9.10 ✕ 102 ft closer to the building, she finds the angle to be 23.8°. Use Lil's data to ...

**Math**

Just got 100% answers are A. D. B. C.

**Chemistry**

Your question is very broad, because there are many types and techniques available. advantages: small sample size fast differentiates isotopes can be combined with GC and LC to run mixtures, or can be run in tandem for proteins etc. disadvantages: doesn't directly give ...

**Science**

aaaa OK SO Is it A?

**Science**

How can volcanic eruptions change the surface of the earth? by creating large deposits of coal by creating new islands and land by lowering land levels several feet by decreasing the level of the ocean I think its C

**Happy Christmas and Merry New Year!!**

MERRY CHRISTMAS

**math**

Ok So how do you solve 32b+55

**Reading**

Sorry about that lol merry Christmas Mr.Reed :D

**Reading**

ohhhhh gotcha ya thanks :)

**Reading**

Jonny Tremain by Ester Forbes

**Reading**

Describe Johnny’s relationships with Cilla, Lavinia Lyte, and Dove now that Johnny is living with Rab and his family. What do these relationships reveal about Johnny and his personal growth?

**math**

how do you solve 3x+11

**P.E**

Thanks guys :)

**P.E**

Which of the following does not describe why many people with eating disorders do not see help because they_____. A. are embarrassed b.deny there is a problem C. find comfort in food D are ashamed of their behaviors I don't now if its C or D but My personal think its D Ms....

**Physics**

A golf ball is dropped from rest from a height of 8.30 m. It hits the pavement, then bounces back up, rising just 5.00 m before falling back down again. A boy then catches the ball when it is 1.10 m above the pavement. Ignoring air resistance, calculate the total amount of ...

**Physics**

A tourist being chased by an angry bear is running in a straight line toward his car at a speed of 6.04 m/s. The car is a distance d away. The bear is 28.8 m behind the tourist and running at 7.26 m/s. The tourist reaches the car safely. What is the maximum possible value for d?

**Phsics**

A car is traveling along a straight road at a velocity of +38.8 m/s when its engine cuts out. For the next 2.01 seconds, the car slows down, and its average acceleration is . For the next 6.36 seconds, the car slows down further, and its average acceleration is . The velocity ...

**English**

In the story "Why, You Reckon," how old would you say the characters are?

**math**

1.5<n and n<2

**Social Studies**

Lol so true and @ddjmike is100% right thanks sooooo much lifesaver literally ~xoxo Courtney

**College Chemistry**

the acid dissociation constant for acetic acid is 1.85x10^-5. Calculate the pH at the equivalent point and the pH at one-half the equivalence point for the titration of 25.00 mL of 0.100 M acetic acid with 0.100 M NaOH?

**algebra 2**

Find the slope of the line passing through the points (3, -1) and (0, 8)

**Physics**

A bowling ball traveling with constant speed hits the pins at the end of a bowling lane 16.5 m long. The bowler hears the sound of the ball hitting the pins 2.44 s after the ball is released from his hands. What is the speed of the ball? The speed of sound is 340 m/s.

**Physics**

A bowling ball traveling with constant speed hits the pins at the end of a bowling lane 16.5 m long. The bowler hears the sound of the ball hitting the pins 2.50 s after the ball is released from his hands. What is the speed of the ball? The speed of sound is 340 m/s.