Saturday

October 1, 2016
Total # Posts: 3,645

**Physics**

A tennis player can serve the ball of mas 57g at an initial horizontal speed of 55ms^-1 the ball remains in contact with the racket for 0.055s. Calculate the average force exerted on the ball during the serve.

*October 8, 2014*

**math**

John tosses a penny 10 times and finds that 2 of those times the penny comes up heads and 8 of those times the penny comes up tail. What should John conclude? a.That the expected relative frequency probability of getting heads when tossing a penny is 2/10. b. That it is more ...

*October 7, 2014*

**Math**

The New York State Lottery advertises that for its instant lottery games there is a 4 in 21 chance of winning. If you buy only 1 instant lottery card, what is the chance you will win? I think the answer is 4/21 but am not sure.

*October 7, 2014*

**Timerate problem(calculus)**

Sand is being dropped at the rate 10 metercube/min onto a conical pile. If the height of the pile is always twice the base radius, at what rate is the increasing when the pile is 8 m high?

*October 6, 2014*

**science**

During the process of photosynthesis, plants capture the kinetic energy of moving photons and transform it into potential energy in the form of Select one: a. pyruvate. b. chemical bonds. c. stroma. d. thylakoid disks.

*October 5, 2014*

**science**

The muscles of a very active organism would contain more mitochondria than the muscles of a less active organism. Select one: True False

*October 5, 2014*

**education**

what is the syllable pattern for legal

*October 5, 2014*

**chemistry**

I have other problems similar so,I would like to see the process of it.

*October 2, 2014*

**chemistry**

Light travels at the speed of3.0x10^10 cm/sec. what is the speed of light in feet per hour? I'm not sure on how to start it.

*October 2, 2014*

**Chemistry**

What is the final temperature, in oC, after a 27.0 g piece of ice, at 0oC, is placed in a styrofoam cup with 120 g of water initially at 70.5oC. Assume there is no transfer of heat to or from the surroundings. The specific heat of water = 4.184 JK-1g-1 The heat of fusion of ...

*October 2, 2014*

**statistics**

heights of men on a baseball team have a bell shaped distribution with a mean of 172 cm and a distribution of 9cm. Using the empirical rule, what is the approximate percentage of the men between the following values? a. ___% of the men are between 145cm and 199cm b.___% of the...

*October 2, 2014*

**Calculus Minima Problems**

A small island is 2 km off shore in a large lake .A woman on the island can row her boat 10 km/hr and can run at a speed of 20 km/hr. If she rows to the closest point of the straight shore, she will land 6 km from a village on the shore. Where should she land to reach the ...

*September 28, 2014*

**Calculus Maxima/Minima**

thx reiny

*September 28, 2014*

**Calculus Maxima/Minima**

An automobile traveling at the rate of 30 ft/sec is approaching an intersection. When the automobile is 120 ft. from the intersection, a truck, traveling at the rate of 40 ft/sec on a road at right angles with the automobile’s road crosses the intersection. How long after...

*September 28, 2014*

**Calculus**

A small island is 2 km off shore in a large lake .A woman on the island can row her boat 10 km/hr and can run at a speed of 20 km/hr. If she rows to the closest point of the straight shore, she will land 6 km from a village on the shore. Where should she land to reach the ...

*September 28, 2014*

**statistics**

According to U.S. News & World Report data, in 1995 tuition costs at Indiana University, a public university, were $2,984 per year, while the tuition costs at the University of Evansville, a private university in Indiana, were $11,800 per year. In that same year the average ...

*September 27, 2014*

**statistics**

Slf-Esteem Scoresdepression Scores Mean 3.43 15.78 StrdDev 0.75 10.34 The above chart contains the means and standard deviations for self-esteem scores and depression scores. Using this information and the most likely correlation coefficient obtained in Question 12 (-.76), ...

*September 26, 2014*

**statistics**

A nutritionist was interested in determining the smoking status of her clients. She asked each of her clients to report his or her current smoking status: Smoker, Ex-Smoker, and Non-Smoker. Which of the following graphical techniques is the best way for her to represent the ...

*September 26, 2014*

**statistics**

In a school election, 5 people run for student body president. The actual number of votes for each candidate would be a ___ variable. If the total number of votes were removed and the candidates were listed in order of least to most popular, this would be a __ variable. a. ...

*September 25, 2014*

**science/math**

I think your should get 39.32

*September 18, 2014*

**biology**

Which of the following would NOT likely have occurred without the evolution of photosynthetic organisms? A. Life would be much less diverse. B. Most organisms would have gone extinct due to the increase in oxygen. C. Mitochondria-containing cells would not have evolved. D. ...

*September 16, 2014*

**Statistics**

A class consists of 9 students with an average age of 40. When the Instructor arrives the average age of the students and the Instructor is 41. What is the age of the Instructor?

*September 15, 2014*

**Math**

Any negative number/ Any number less less than zero

*September 11, 2014*

**Physics**

A kayaker needs to paddle north across a 85 m wide harbor. The tide is going out, creating a tidal current that flows to the east at 1.6 m/s. The kayaker can paddle with a speed of 2.8 m/s. (a) In which direction should he paddle in order to travel straight across the harbor?

*September 11, 2014*

**Physics**

A cannon fires a shell straight upward; 2.1 s after it is launched, the shell is moving upward with a speed of 20 m/s. Assuming air resistance is negligible, find the speed (magnitude of velocity) of the shell at launch and 4.7 s after the launch.

*September 5, 2014*

**ratios**

Billy wanted to write a ratio of the number of cars to the number of trucks in the police parking lot. He wrote 1:3. Did billy write the ratio correctly?

*September 2, 2014*

**math**

12. What is the distance between P(–4, 3) and Q(6, 1)? Round to the nearest tenth. can someone please explain how to do this problem please

*August 29, 2014*

**math **

Diana is going camping with her family. Their campsite is 3/4 mile away. They walk at a steady speed of 1 and 1/8 miles an hour. How many minutes will it take to get to the campsite

*August 21, 2014*

**math**

A micro-millimeter is defined as one millionth of a millimeter. A length of 17 micro-millimeters may be represented as A. .00017 mm. B. .0000017 mm. C. .000017 mm. D. .00000017 mm.

*August 13, 2014*

**business**

Just give me two ideas where I can start from, ASAP please.

*August 12, 2014*

**criminal justice**

How a warden must address ethical issues between the correctional officers and the inmates. Can you help me with where to locate information for this question

*August 9, 2014*

**Economics**

. A firm has prospective sales of $50 million, fixed costs of $60 million, and variable costs of $40 million. What does the firm do (a) in the short run? (b) in the long run?

*August 6, 2014*

**MA 1310**

What is the amplitude, period and phase shift for y = 1/4 cos (3x +7)? Thank you, please show work.

*August 4, 2014*

**physics**

(a) How high a hill can a car coast up (engine disengaged) if friction is negligible and its initial speed is 78.0 km/h? m (b) If, in actuality, a 750 kg car with an initial speed of 78.0 km/h is observed to coast up a hill to a height 12.0 m above its starting point, how much...

*August 4, 2014*

**chem**

Ksp: BaSO4: 1.1*10^-10 CaSO4: can't find it

*August 3, 2014*

**chem**

It doesn't give anything else except what i wrote

*August 3, 2014*

**chem**

sample of 1.00g of BaSO4 and a similar sample of 1.00g of CaSO4 were added to water at 25 Celsius to give 1L of solution. Calc. the concentration of Ba2+, Ca2+, and SO4^2- ions present in the solution?

*August 3, 2014*

**Math**

A particle moves with a velocity of v(t)=3cos(2t) m/s along an axis. Find the distance traveled by the particle over the time interval 0 is less than or equal to "t", which is less than or equal to (pi/8)

*July 31, 2014*

**Math**

find the area of the region bounded by the function y=-x^2+5x-4 and the x-axis

*July 31, 2014*

**math **

a 20ft flag pole casts a shadow 30ft long. the pole is 25ft from the wall. how high is the wall in the nearest tenth?

*July 21, 2014*

**Chemistry**

What's the answer though

*July 21, 2014*

**chemistry**

a. Determine the density of a cube of copper with a length of 5.00 cm and a mass of 1,112.50 g. b. Calculate the number of atoms in the cube

*July 20, 2014*

**Chemistry**

Thank you so much for all your help.

*July 15, 2014*

**Chemistry**

Q=578000(1.2)(7.8)= 5410080. Im not sure I understand the last part with the grams of the salt.

*July 15, 2014*

**Chemistry**

Glauber's salt undergoes a phase transition according to the following equation: Na2SO4*10H2O(s)--> Na2SO4*10H2O(l) ∆H = 74.4 kJ/mol Calculate the mass (g) of Glauber's salt (use the masses to two decimal places found in the front of your text) needed to lower...

*July 15, 2014*

**Chemistry**

A 38.9 g piece of iron at 84.6oC is placed in a beaker containing 179.7 g of 20.7oC water. What is the final temperature (oC)of the water?

*July 14, 2014*

**Chemistry**

An unknown metal with a mass of 313 g has a heat capacity of 121 J/oC. What is the specific heat of the metal?

*July 14, 2014*

**Chemistry**

THANK YOU!!!

*July 13, 2014*

**Chemistry**

Yes, thank you for catching that. So with the corrections (except I kept R as .0821) I got (1)(.0821)(300.8)/1.1=22.45. Then 16.042/22.45=0.71g/L Is it now correct? I appreciate all your help!!!

*July 13, 2014*

**Chemistry**

V=nRT/P I used (1)(.0821)(300.8)/1=24.7

*July 13, 2014*

**Chemistry**

So I have gotten 2 different answers. I used V=nRT/P to get the volume. Which was 24.7. Then I used D=M/V and divided 16.042/24.7 to get .65g/L Is that right?

*July 13, 2014*

**Chemistry**

Determine the density of methane (CH4) in g/L at 27.8oC and 1.1 atm.

*July 13, 2014*

**Chemistry**

A volume of 0.155 L of a gas at STP weighs 0.412 g. Calculate the molar mass of the gas.

*July 13, 2014*

**Non**

How many US gallons of fuel will a tank 66 in three-quarter inch by 132" x 10" whole

*June 30, 2014*

**finance**

Innovation Company is thinking about marketing a new software product. Upfront cost to market and develop the product are $5 million. The product is expected to generate profits of $1 million per year for 10 years. The company will have to provide product support expected to ...

*June 13, 2014*

**Physics**

The air pressure on Pikes Peak in Colorado is approximately 600 millibars. What is the relationship between air pressure at the top of Pikes Peak and at sea level, where air pressure is 1013 millibars?

*June 10, 2014*

**Science**

The air pressure on Pikes Peak in Colorado is approximately 600 millibars. What is the relationship between air pressure at the top of Pikes Peak and at sea level, where air pressure is 1013 millibars?

*June 10, 2014*

**math**

Could you explain to me why 9/64 is the answer to the following questions:A fair spinner is spun three times. The spinner is labeled A,B,C,D. What is the probability of getting a c exactly twice?

*June 6, 2014*

**physics**

What is the free-fall acceleration in a location where the period of a 2.87 m long pendulum is 3.4 s? Answer in units of m/s 2

*June 2, 2014*

**history**

cn I get paper 1 and paper 2 memorandam of 2014

*May 29, 2014*

**Albebra**

A flush in a five card hand with all cards of the same suit.What is the probability of getting a flush?

*May 28, 2014*

**math**

if i an 100' from a tree and the angle to the top is 24 degrees how tall is the tree

*May 26, 2014*

**physics**

1 Hz A.

*May 26, 2014*

**Spanish / Language **

Carlos lives in Segovia in an apartment on the bottom floor of a beautiful old building. What do you call this floor in Spanish? Be sure and use the article, "el" or "la" with it. (1 point) Fill-in-the-Blank 2. Roberto lives two floors above Carlos. What ...

*May 24, 2014*

**Geometry Help!!!**

Hi

*May 22, 2014*

**Math**

A beam tests against a wall, forming a 50 degrees with the floor. Use the function y=9 sec 0 to find the length of the beam to the nearest tenth of a foot. 14.0 ft 11.7 ft 5.8 ft 6.9 B?

*May 19, 2014*

**Algebra 2**

A B C or D?

*May 19, 2014*

**Algebra 2**

-1 -3 -3 1-7 6 -1 -3 3 1 -7 6 1 -3 3 -1 -7-6 -1-3 3 1 7 6

*May 19, 2014*

**Algebra**

Which is the degree measure of an angle whose tangent is 5.67? Round the answer to the nearest whole number.

*May 19, 2014*

**Math**

How do I figure out the largest rectangle area

*May 14, 2014*

**PHI 103**

This is not the best of all possible worlds, because the best of all possible worlds would not contain suffering, and this world contains much suffering

*May 11, 2014*

**personal finance**

no clue

*May 11, 2014*

**Algebra**

1/2(10x-8)-3(x-1)>15=?

*May 8, 2014*

**world regional geography**

Expanding the copra trade

*May 8, 2014*

**math**

Let say that Amy made 8 out of 21 free throws and Jane made 4 out of 21 free throws. Who had the better rate of success? Round your answer to the nearest percent.

*May 4, 2014*

**math**

Simply the unknowns variables 5(2-c)=10(2c-4)-6(3c+1) 1.25y-20.5=0.5y-11.5 (3) 7p-3q=23(3)

*May 3, 2014*

**Physics**

The column is at 60 cm in length. a)what is the wavelength of the sound wave produce by fork. b)what is the frequency of fork if air temperature is 13.6 Centigrade.

*May 2, 2014*

**computer**

You suspect that the failure of a router or of a transmission line connecting routers has left some of your important servers unavailable to clients at your site. How could you narrow down the location of the problem using what you learned in this chapter?

*April 30, 2014*

**Computer **

A router receives an IPv4 packet. The source ip address is 10.55.72.234. the destination host is 10.4.6.7. the TTL value is 1. The protocol field value 6. What will the router do with this packet?

*April 30, 2014*

**physics**

A box is being lowered down a wall at constant speed by a girl, as shown. Her hand is pushing on the edge of the box with 50 N of force at a 45° angle above the horizontal. The box weighs 40 N.

*April 24, 2014*

**History**

I'm trying to find out the difference between Masons and Anti-Masons like in the 1830s. But all the info is about brick layers. How else could I look this up to get the right Mason?

*April 9, 2014*

**Social Studies**

How did the Fugitive Slave Act and the Kansas-Nebraska Act further divide the North and South? What role did the concept of popular sovereignty play in these conflicts? Do you think there was any way to avoid the violence that came out of this era?

*April 9, 2014*

**Health**

How many bones is in an adult body???

*April 9, 2014*

**physics**

Consider a coaxial cable with 2Amps in the center conductor coming out of the page, and 1Amp in the outer conductor going into the page. The center conductor has a radius of 1mm, the outer conductor's inner radius is 2mm, and the outer conductor's outter radius is 3mm...

*April 7, 2014*

**English II B**

Deana created a computer-assisted slide show. To make the slide show legible, what is one thing she needs to avoid? A)typing bullets in a small font B)adding color and effects to the font C)printing handouts on paper D)adding tables and graphics

*April 3, 2014*

**English II B**

Online publication, I think.

*April 3, 2014*

**English**

I think C.

*April 3, 2014*

**English**

What is the best strategy for organizing an essay to describe events in time sequence? A)comparison and contrast B)order of importance C)chronological D)spatial

*April 3, 2014*

**English**

Thank you

*April 3, 2014*

**English**

I think it's C but im not sure.

*April 3, 2014*

**English**

What is the purpose of prewriting in the writing process? A) to help polish your writing B) to find details to complete paragraphs C) to organize your thoughts within a draft D) to help develop a topic for writing

*April 3, 2014*

**English**

What is the purpose of a response-to-literature essay? A) to entertain B) to persuade C) to analyze D) to compare and contrast

*April 3, 2014*

**physics**

I once was given a metal whiskey flask for being in my cousin’s wedding. When it got dented, I put in 1 gram of H2O (initially 21°C, just like the air filling the rest of the flask) and heated it up to boil the water. It popped the dent out. Assume the flask had a ...

*April 2, 2014*

**Chemistry**

yes I apologize, #1 is C6H12O6 --> C2H4O2 thankyou for all your help!

*April 1, 2014*

**Chemistry**

Having trouble balancing redox equations. Teacher says I should use the method of half reactions and I'm not sure how. Any explanation or formula would be nice. C6H12O2 --> C2H4O2 SO2+H2O+O2 --> H2SO4 C2H6O+O2 --> CO2 + H2O

*April 1, 2014*

**math**

63.49 divided by 7

*March 26, 2014*

**Physics**

A 150g piece of copper is heated to 100oC. It is then held in the open air for 2 minutes and 31 seconds, and then dropped into a 100g copper calorimeter containing 200g of water at 17oC. If the rate of loss of heat of the copper piece while held in the air is 12.6J/sec, ...

*March 25, 2014*

**Physics**

Ok, but then how do you find Tf?

*March 25, 2014*

**Physics**

An aluminum calorimeter has a mass of 60g and an initial temperature of 25oC. What is the final temperature attained when 86.8g of water at 90oC is poured into it?

*March 25, 2014*