# Confused

Popular questions and responses by Confused-
## Physics

A water wave is generated in a ripple tank by an oscillator that vibrates 50 times in 30 seconds. A given trough of the wave travels 50.0 cm in 15 seconds. What is the wavelength of the water wave? Produce all your workings. I got 50/30 = 1.67 vibrations

*asked on January 24, 2013* -
## college physics

a tennis ball is thrown straight up with an initial velocity of 22.5 m/s. it is caught at the same distance above the ground. a). how long does it take to reach its maximum height? b). how high does the ball rise? c). at what speed does it hit the ground?

*asked on April 2, 2013* -
## Physics

When the pendulum bob reaches the mean position, the net force acting on it is zero. Why then does it swing past the mean position?

*asked on October 31, 2012* -
## physics

1)A toy train is initially at rest on a track fastened to a bicycle wheel, which is free to rotate. How does the wheel respond when the train moves clockwise? When the train backs up? Does the angular momentum of the wheel-train system change during these

*asked on July 9, 2010* -
## English

in which sentence is the underlined word the simple predicate? A. According to legend, THERE is buried treasure nearby. B. People with metal detectors SEARCH for it every weekend. C. So far, no treasure has BEEN found. D. Most treasure seekers leave here

*asked on September 17, 2018* -
## Physics

What is the angle of refraction of a light ray that enters the surface of a calm lake from air at an angle of 45o to the normal? The refractive index of water is 1.333. I don't even know how to start this or what the formula is. Thanks for your help in

*asked on January 24, 2013* -
## math

The 2 pulleys in the figure have radii of 15 cm and 8 cm, respectively. The larger pulley rotates 25 times in 36 seconds find the angular velocity of each pulley in radians per second. Find angular velocity of each pulley in radians per second.

*asked on December 2, 2010* -
## Chemistry

The aquation of tris(1, 10-phenanthroline)iron(II) in acid solution takes place according to the equation: Fe(phen)3^2+ + 3H3O + 3H2O==> (Fe(H2O)6^2+ + 3 phenH^+ If the activation energy is 126 kJ/mol and frequency factor is 8.62 x 1017 s-1, at what

*asked on March 2, 2010* -
## Physics

In the figure a uniform, upward electric field of magnitude 1.90 × 103 N/C has been set up between two horizontal plates by charging the lower plate positively and the upper plate negatively. The plates have length L = 19.0 cm and separation d = 1.60 cm.

*asked on September 16, 2016* -
## Physics

* At an accident scene on a level road, investigators measure a car's skid mark to be 58 m long. It was a rainy day and the coefficient of friction was estimated to be 0.38. Use these data to determine the speed of the car when the driver slammed on (and

*asked on November 1, 2015* -
## Physics

Which of the following equations describes the condition for observing the fourth bright fringe in Young's double-slit interference pattern? Assume n = 0 for the central bright fringe. Which of the following equations describe the condition for observing

*asked on January 24, 2013* -
## Math

Is the product of 4/7 and radical 16 a rational or irrational number? Explain.

*asked on June 13, 2018* -
## physics

A crate rests on a flatbed truck which is initially traveling at 17.8 m/s on a level road. The driver applies the brakes and the truck is brought to a halt in a distance of 33.1 m. If the deceleration of the truck is constant, what is the minimum

*asked on October 2, 2014* -
## Chemistry

HOBr (aq) H+ (aq) + OBr- (aq), Ka = 2.3 x 10^-9 Hypobromous acid, HOBr, is a weak acid that dissociates in water, as represented by the equation. (a) Calculate the value of [H+] in a solution of HOBr that has a pH of 4.95. Ans: 1.1 * 10^-5 M (b) Write the

*asked on April 10, 2012* -
## Spanish

Add a prepositional phrase to clarify either to whom an item(s) belongs. Cual es su problemas? (ella) Thank you for using the Jiskha Homework Help Forum. Don't be confused! A prepositional phrase is often used to clarify "su" because it could mean "hers,

*asked on June 24, 2007* -
## Math

A car traveled 36 miles in 45 minutes, the car traveled at a constant speed. If the the car continues to travel at this rate, which equation can be used to determine y, the total number of miles the car will travels in x hours?

*asked on March 30, 2018* -
## Geometry

For an ellipse, one focus is (0,0), one vertex is (2,0), and the eccentricity is 0.4. How do I find the equation for the ellipse? It seems like I have so little information!

*asked on May 28, 2012* -
## Math

The world record for cycling a stretch of 20 kilometers is 26 minutes. This corresponds to an average speed of, approximately, (A) 29 mph (B) 46 mph (C) 32 mph (D) None of these

*asked on August 9, 2017* -
## Science

Which of the following is a problem with using solar power as a main source of energy? A. People do not yet have the technology to use solar power*** B. The sun is not close enough to provide solar energy C. Power from solar energy contains a large amount

*asked on April 13, 2017* -
## Science

On page 111 of your reading material there is a problem that requires you to calculate the average speed for a daylong bus trip. The rest stops the driver made are included in the calculations because that is how the problem is defined. However, suppose

*asked on December 7, 2015* -
## Chemistry

A direct-current power supply of low voltage (less than 10 volts) has lost the markings that indicate which output terminal is positive and which is negative. A chemist suggests that the power supply terminals be connected to a pair of platinum electrodes

*asked on May 1, 2012* -
## chemistry

a 10.0mL vinegar sample was completely neutralized by 22.5mL 0.2M NaOH solution. calculate molarity and % of acetic acid in vinegar. please help

*asked on April 26, 2010* -
## physics

A car on the highway travels at 90 km/hr. Express this speed in m/s. can yall show me how to convert this

*asked on July 31, 2018* -
## physics

A bow with a spring constant of 398 N/m has an arrow placed in it and pulled back a distance of 0.6 m. If the arrow is shot straight up in the air how high will it go? Assume the mass of the arrow is 0.16 Kg.

*asked on October 16, 2014* -
## Physics

A person's body is producing energy internally due to metabolic processes. If the body loses more energy than metabolic processes are generating, its temperature will drop. If the drop is severe, it can be life-threatening. Suppose a person is unclothed

*asked on December 7, 2012* -
## college algebra

find functions f anf g so that fog equals H H(x)=ãx^2+17 please show work

*asked on November 30, 2012* -
## college algebra

solve the following exponential equation. 7^x=8 a. x= Write in exact solution b. then with that answer move the decimal 3 points over

*asked on November 27, 2012* -
## Physics

Which of the following is an example of diffuse reflection? light reflected from the surface of a dry asphalt roadway light reflected from the surface of a calm lake light reflected from the surface of glossy paper light reflected from the surface of a

*asked on October 29, 2012* -
## Physics

When the pendulum bob reaches the mean position, the net force acting on it is zero. Why then does it swing past the mean position?

*asked on October 23, 2012* -
## Advanced physical science

An astronaut drops a golf ball to the surface of the moon from a height of 1.5m. The golf ball has a velocity of 2.24 m/s right before it lands on the moon (assume this height to be zero). What is acceleration due to gravity on the moon?

*asked on October 4, 2012* -
## Chemistry

What alkane effuses at 1/5 the rate of He

*asked on June 18, 2012* -
## physics

A spherical conductor has a radius of 14.0 cm and charge of 26.0 µC. Calculate the electric field and the electric potential (a) r = 10.0 cm, (b) r = 20.0 cm, and (c) r = 14.0 cm from the center. how do i calculate k?

*asked on February 7, 2012* -
## physics HELP MEEE SO CONFUSED

A spherical conductor has a radius of 14.0 cm and charge of 26.0 µC. Calculate the electric field and the electric potential (a) r = 10.0 cm, (b) r = 20.0 cm, and (c) r = 14.0 cm from the center.

*asked on February 7, 2012* -
## statistics

you draw two cards from a standard deck of 52 cards, but before you draw the second card, you put the first one back and reshuffle the deck.

*asked on April 15, 2011* -
## math

find v for the following question.. the tip of the airplane propeller 3m long, rotating 500 times per minute (hint r=1.5m)

*asked on December 2, 2010* -
## Reaction rates

The reaction, C2H5Br --> C2H4 + HBr, has a rate constant k = 0.0000100 s-1 at 363 °C and k = 0.000479 s-1 at 427 °C. What is the rate constant for the reaction at 725 K? Round your answer to 3 significant figures.

*asked on November 20, 2010* -
## Concentration and Reaction

The rate of the following reaction: Radioactive decay of 90Sr, is characterized by the rate constant k = 0.024 year-1. What is the half-life (in years) for this reaction at the same conditions when the initial concentrations are 0.0356 M? (Round your

*asked on November 20, 2010* -
## physics

1. If our sun shrank in size to become a black hole, using the gravitational force equation, explain why the Earth's orbit would not be affected. 2. Strictly speaking, you weigh a tiny bit less when you are in the lobby of a massive skyscraper than you do

*asked on July 13, 2010* -
## please help me paraphrase

I am going to have questions to answer on this passage, and it's very difficult to understand so if anyone could please help me paraphrase or give me a summary, it would help a lot. Thanks. Genius or originality is, for the most part, some strong quality

*asked on October 25, 2006* -
## math

To use a certain cash machine, you ned a persona identification code. If each code consists of two letters followed by one of the digits from 1-9(such as AQ7 or BB3) or one letter followed by two difits (such as Q3 or J88), how many different codes can be

*asked on June 19, 2020* -
## math

Kelly enlarged the area of a photograph to 250% of its original size. The original dimensions of the photograph were 5 inches by 7 inches. What is the area of the enlarged photograph, in square inches? I know the solution is 5(2.5) times 7(2.5) but it says

*asked on June 12, 2020* -
## math

A marksman's chance of hitting a target with each of his shots is 60%. (Assume that the shots are independent of each other.) If he fires 30 shots, what is the probability of his hitting the target at least 20 time? First, I found the mean by multiplying

*asked on December 4, 2019* -
## Biology

which of the following list structures from smallest to largest? A. chromosome, supercoil, coil, nucleosome, double helix B. chromosome, coil, double helix, nucleosome, super coil C. double helix, nucleosome, coil, super coil, chromosome D. nucleosome,

*asked on September 13, 2018* -
## Math

Is x^2 + y^2= 6 An equation for a circle??

*asked on April 2, 2018* -
## physics

What would it mean if mu is greater than one?

*asked on October 17, 2014* -
## advance math

an aquarium is in the shape of a right rectangular prism. each side of the aquarium is a rectangle that is 10 in wide and 8 in high. when the aquarium is tilted, the water in it just cover an 8 in by 10 in end, but only three-fourths of the rectangular

*asked on October 3, 2013* -
## Calculus

The region between the graphs of x=y^(2)and x=2y is rotated around the line y=2. The volume of the resulting solid is... I've tried this five times and no luck. Please help. I think my a=o and b=2. I would appreciate the help.

*asked on February 9, 2013* -
## college algebra

use the properties of logarithms to find the exact value of the expression loglower 3^18 - log lower3^6 **how do I make the three lower in the log equation?

*asked on November 27, 2012* -
## Advanced physical science

At the top of the Washington monument, a bird drops an acorn into the reflecting pool 169m below. If the acorn has a massof 1.0 kg, with what velocity would it hit the water?

*asked on October 4, 2012* -
## Advanced physical science

A fiery ball of wood is loaded into a medieval catapult to be thrown into a castle. Unfortunately, the attacking heathens are not very smart and since geometry and physics were not studied in their time, they launched the ball straight up into the air. The

*asked on October 4, 2012* -
## APS

The Marshmellow man tromps along the streets of New York City with his blue sailor hat on. He tries to climb up a building to reach Ghostbusters and a gargoyle statue falls 326m to the street below. What height is the gargoyle when it reaches a velocity of

*asked on October 4, 2012* -
## APS

Ben eats a bowl of rice as he walks across the San Francisco Bridge. When he is finished, he drops his empty bowl 67m down to the bay water. What speed does it hit the water with?

*asked on October 4, 2012* -
## economics

In the following examples, state how you would use the principle of marginal analysis to make a decision. a. Deciding how many days to wait before doing your laundry b. deciding how much library research to do before writing your term paper c. Deciding how

*asked on June 1, 2012* -
## Chemistry

A 0.5224g sample of an unknown monoprotic acid was titrated with 0.0998M of NaOH. The equivalence point of the titration occurs at 23.82 mL. Determine the molar mass of the unknown acid.

*asked on April 29, 2012* -
## chemistry

If you filled three balloons with eaqual volumes of hydrogen, argon, and carbon dioxide gas all at the same temperature and pressure, which ballon would weigh the most? The least?

*asked on December 13, 2011* -
## math

A woman is sitting in a boat at anchor on a lake. Her boat bobs up and down once every 2.0·s. She notices that when the front of her 3.0·m long boat is at one wave crest, a second crest is at the middle of her boat, and a third is at the end. What is the

*asked on December 8, 2011* -
## calculus

The function f is twice differentiable, and the graph of f has no points of inflection. If f(6)+3, f'(6)=-1/2, and f"(6)=-2, which of th following could be the value of f(7). A.)2 B.)2.5 C.)2.9 D.)3 E.)4 the answer is A. but what are the steps to reach

*asked on April 26, 2011* -
## chemistry

What is the rate of the following reaction (M/s) if the rate constant for the reaction is 0.500 L•mol-1•s-1 and the concentration of each reactant is 0.0628 M. (The units for the rate constant depend upon the rate law). CO + NO2 --> CO2 + NO

*asked on November 20, 2010* -
## physics

If there were no air drag, how fast would drops fall from a cloud 2.4 kilometer above the Earth's surface? answer in m/s.

*asked on October 6, 2010* -
## physics

If there were no air drag, how fast would drops fall from a cloud 2.4 kilometer above the Earth's surface? Answer in m/s.

*asked on October 5, 2010* -
## physics

1. (a) How far below an initial straight-line path will a projectile fall in eight seconds? (b) Does your answer depend on the angle of launch or on the initial speed of the projectile? the answer is no. but defend it. 2. Why is it important that a

*asked on July 13, 2010* -
## math

In Quadratics Grade Ten:How do you find the coordinates of the vertex? What is the Optimum value mean? What are the zeros of the relation? How do you know if the parbola is Maximum or Minimum?

*asked on March 26, 2010* -
## math

A Ferris wheel 28.0m in diameter rotates once every 21.0s. What is the ratio of a person's apparent weight to her real weight at the top? What is the ratio of a person's apparent weight to her real weight at the bottom?

*asked on October 2, 2009* -
## chemistry

Benzene has a heat of vaporization of 30.72kj/mol and a normal boiling point of 80.1 C . At what temperature does benzene boil when the external pressure is 445 ? This is how I am solving this problem, but when I enter the answer it says im wrong. Can

*asked on January 24, 2009* -
## MATH CHECK

COS[ARCSIN (SIN 3PI/4)] =COS[ARCSIN (SQRT2/2)] =COS [PI/4] = SQRT2/2

*asked on December 11, 2008* -
## Chem

Ascorbic acid, H2C6H6O6, is a diprotic acide with a K1= 7.9 E-5 and a K2=1.6E-12. In a .005 M aq solution of ascorbic acid which of the following species is present in the lowest concentration. 1. H2O 2. H3O 3. H2C6H6O6 4. HC6H6O6 5. C6H6O6

*asked on April 22, 2008* -
## accounting/finance

What does a constant debt-equity ratio mean?

*asked on February 4, 2008* -
## English II

I need to determine a rule as to why the answer is C. A.) Jumping off of a balance beam is different from jumping off a trampoline; each jump requires a unique skill. B.) Jumping off a balance beam is different from jumping off a trampoline; each jump

*asked on October 16, 2007* -
## psychology

The major perspective in psychology that views behavior as guided by one's self image and by needs of personal growth is the a. cognitive view b. humanistic view c. psycholdynamic view d. biopsychological view I had already guessed c and that was wrong,

*asked on March 4, 2007* -
## chemistry

In a titration, 21.5 mL of 0.00369 M Ba(OH)2 neutralized 12.1 mL of HCl solution. What is the molarity of the HCL solution? ( I used the titration formula and plugged in the given values. But it's wrong. I know we don't have to divide by any number to the

*asked on April 20, 2020* -
## trigonometry

Points on the terminal sides of angles play an important part in the design of arms for robots. Suppose a robot has a straight arm 10 inches long that can rotate about the origin in a coordinate plane. If the robot's hand is located at (10, 0) and then

*asked on November 12, 2019* -
## chemistry

In distillation components of a mixture are separated into groups of molecules with simi- lar 1. densities. 2. melting points. 3. None of these 4. bond energies. 5. boiling points. Filtration is which method of separation? 1. physical 2. chemical

*asked on September 19, 2019* -
## Texas History

What troubled Manuel de Mier y Teran when he visited Texas, which he reported to the Mexican government? I picked "A. the amount of slavery in the state" because he was angry that Americans who arrived didn't respect the rule of "no slavery". Then I'm

*asked on October 26, 2018* -
## American government

In both the house and senate, a bill introduced by a member is next a. Given a number b. Scheduled for floor debate c. Sent to a standing committee d. Sent to the president I read the text and I think the answer is D, am I wrong?

*asked on September 21, 2018* -
## American government

If a majority of committee members support a bill, what is likely to happen to it? A. The committee will pigeonhole the bill B. the committee will report the bill favourably to the floor C. The committee will rewrite the bill D. The committee will report

*asked on September 20, 2018* -
## Human Resources

You have just been hired as a human resource specialist and will be responsible for conducting background investigations. Which of the following is safest to assume? A. You will be posting background check results. B. You will be supervising new hires. C.

*asked on September 12, 2018* -
## Math

1) Carlos and Nathan ate lunch together in a park bench. At 1:00p.m., they left the bench and walked in different directions. By 1:05p.m., Carlos and Nathan were 60 meters apart. If they each continued walking in a straight line at the same speed as

*asked on June 11, 2018* -
## Applied Math

6 divided by 26 yd. 2 ft. 6 in. Please explain how you get this your answer if possible. Thank you in advance.

*asked on February 4, 2018* -
## Math help please!

y + 1.2y + 1.2z Someone told me that the answer was 2.2y + 1.2z 1. Is that true? 2. How did the 1.2y turn into 2.2y?

*asked on December 14, 2017* -
## Math

I have researched what a local extrema is and every definition is weird or worded to where i do not understand it. Can anyone explain what local extrema is.

*asked on December 11, 2017* -
## Finance

Bell Mountain Vineyards is considering updating its current manual accounting system with a high-end electronic system. While the new accounting system would save the company money, the cost of the system continues to decline. The Bell Mountain’s

*asked on March 19, 2016* -
## physics

Henry hits a hockey puck in the positive x-direction at time, t ≈ t0. The puck is then stopped by a net starting at time, t ≈ t1. Which of the following curves could describe the acceleration of the hockey puck if we ignore any effects of friction? 1.

*asked on September 23, 2015* -
## math

1.A square has side lengths of 3 units. One of its vertices is at (5, -2). Which of the following are possible coordinates of another vertex? a)(9,-2) b)(8,-2) c)(5,5) d)(5,-1) idk can someone help i am confused

*asked on April 1, 2015* -
## math help needed bad

I'm really confused on how to answer this question. Can someone help me to figure this out? Thank you A survey about the student government program at a school finds that of 245 students: -218 like the program -27 students think this program is

*asked on April 1, 2015* -
## math help needed bad

how do I make a box and whisker plot with the numbers 13,13,20,21,21,22,24,27? I put them all in order but since there is only 8 numbers i do not know how to find the median,the lower quartile,upper quartile the lowest value and the highest value. Please

*asked on March 9, 2015* -
## physics

A projectile is fired at 33.1° above the horizontal. Any effects due to air resistance are negligible. At the highest point in its trajectory, its speed is 15.5 m/s. Calculate the horizontal component of the initial velocity.

*asked on January 28, 2015* -
## physics

A hockey puck slides with an initial speed of 40.7 m/s on a large frozen lake. If the coefficient of kinetic friction between the puck and the ice is 0.038, what is the speed of the puck after 11.9 s?

*asked on January 23, 2015* -
## physics

A 2.3 kg pendulum bob hangs from a 2 meter string. It is pulled to the side, position A, so that the bob is 111 cm (h on the sketch) above the lowest position, position C. The bob is released and begins to swing. See below. What is its potential energy

*asked on October 16, 2014* -
## physics

Determine whether each statement below is true or false. The force necessary to lift an object is its mass times g. Kinetic energy is the energy of motion. Stopping distance is doubled, if speed is doubled. Work is the product of force and time. A joule is

*asked on October 16, 2014* -
## physics

A 63.8 kg woman lifts herself 36.6 cm each time she does a chin-up. What force does she exert in lifting herself to the chin position? And, how much positive work does she do in pulling herself up once?

*asked on October 16, 2014* -
## physics

A hockey puck slides with an initial speed of 52.3 m/s on a large frozen lake. If the coefficient of kinetic friction between the puck and the ice is 0.02, what is the speed of the puck after 11.8 s?

*asked on September 26, 2014* -
## statistics

A politician claims that she will receive 65% of the vote in an upcoming election. The results of a properly designed random sample of 100 voters showed that 49 of those sampled will vote for her. Is it likely that her assertion is correct at the 0.05

*asked on June 11, 2014* -
## math

c=2πr c= 7.12 pi= 3.14 find value of r -rounded to 2 decimal points

*asked on May 21, 2014* -
## Physics

I've been working on this problem for close to an hour now and keep getting very wrong numbers... The two objects with different mass (m1 = 5.0 kg and m2 = 3.0 kg) in the Atwood's machine shown in the figure are released from rest, with one object at a

*asked on April 20, 2014* -
## Elementary Statistics

There are 100 questions from an SAT test, and they are all multiple choice with possible answers of a,b,c,d,e. For each question, only one answer is correct, find the standard deviation for the numbers of correct answers for those who make random guesses

*asked on April 11, 2014* -
## problem solving - math

the men are camping 45 miles due west and then go 60 miles directly north. if they can cover 18 miles a day how long will it take them to reach the railroad?

*asked on October 3, 2013* -
## problem solving - math

timothy owns 13 chains, each chain having 3 links. timothy wants to use all the small chains to make one circular chain of 39 links. he needs 4 minutes to cut open a link and 10 minutes to close it by smoldering. timothy makes the big chain in 140 minutes.

*asked on October 3, 2013* -
## problem solving - math

3 persons are to divide among themselves 21 equal cask, of which 7 are full, 7 are half full, and 7 are empty. how can an equitable division be made, without pouring the wine from any cask into any other, in such a way that each person receives the same

*asked on October 3, 2013* -
## discrete mathematics

how many baseball games of single elimination must be played by 421 teams in a tournament before a winner is determined

*asked on October 3, 2013* -
## algebra

a teacher reported 1/5 made A's, 1/4 made B, 1/3 made C's, 1/6 made D's, and 12 made F's How many are in the class Let X = the number of students 57/60 + 12 -------

*asked on September 22, 2013*