# SAM

Popular questions and responses by SAM-
## Maths

We have Rs.100/-.If we spend Rs.100/-and balance is Rs.102/-,show how is Rs.2/-extra Spent Balance Day 1 Rs 40 Rs 60 Day 2 Rs 30 Rs 30 Day 3 Rs 18 Rs 12 Day 4 Rs 12 Rs 00 -------- -------- Total Rs 100 Rs102......?

*asked on February 28, 2016* -
## Math

If 5 fishermen catch 5 fish in 5 minutes, how many minutes will it take 50 fishermen to catch 50 fish? If 5 fishermen catch 5 fish in 5 minutes, then the average time it takes each fisherman is 5 minutes to catch one fish. It will take 50 fishermen 5

*asked on September 19, 2006* -
## Physics

While working on her bike, Amanita turns it upside down and gives the front wheel a counterclockwise spin. It spins at approximately constant speed for a few seconds. During this portion of the motion, she records the x and y positions and velocities, as

*asked on August 19, 2012* -
## physics

a 20 kg loudspeaker is suspended 2m below a ceiling by two 3m-long cables that angle outward at equal angles. what is the tension in the cables?

*asked on November 11, 2010* -
## physics

Use R = 8.2 × 10–5 m3 atm/mol K and NA = 6.02 × 1023 mol–1. The approximate number of air molecules in a 1 m3 volume at room temperature (300 K) and atomospheric pressure is:

*asked on June 24, 2009* -
## Statistics

The mean cost of domestic airfares in the United States rose to an all-time high of $385 per ticket. Airfares were based on the total ticket value, which consisted of the price charged by the airlines plus any additional taxes and fees. Assume domestic

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

A particle beam is made up of many protons each with a kinetic energy of 3.25times 10-15J. A proton has a mass of 1.673times 10-27kg and a charge of +1.602times 10-19C. What is the magnitude of a uniform electric field that will stop these protons in a

*asked on August 28, 2014* -
## Statistics / Math

If a student is chosen at random, find the probability of getting someone who is a man or a non-smoker. Round your answer to three decimal places. non regular heavy total man 135 64 5 204 women 187 21 9 217 total 322 85 14 421 Answer in decimal (round to

*asked on February 26, 2008* -
## Physics

A dentist's drill starts from rest. After 3.20 s of constant angular acceleration it turns at a rate of 2.7 104 rev/min. (a) Find the drill's angular acceleration. (b) Determine the angle (in radians) through which the drill rotates during this period.

*asked on November 4, 2010* -
## science

a hydrauli press has a ram of 30 cm diameter and plunger of 4.5cm diameter. find the the weight lifted by the hydraulic press when the force applied at the plunger is 500N

*asked on August 22, 2017* -
## math

32.17Grams rounded to the nearest gram

*asked on May 21, 2017* -
## math

One pipe fills a storage pool in 20 hours. A second pipe fills the same pool in 15 hours. when a third pipe is added and all three are used to fill the pool , it takes only 6 hours. Find how long it takes the third pipe todo the job.

*asked on December 4, 2012* -
## Statistics / Math

A tourist in Ireland wants to visit seven different cities. If the route is randomly selected, what is the probability that the tourist will visit the cities in alphabetical order?

*asked on February 26, 2008* -
## Trigonometry

A calculator is broken so that the only keys that still work are the sin, cos, tan, cot, sin^-1, cos^-1, and tan^-1 buttons. The display initially shows 0. In this problem, we will prove that given any positive rational number q, show that pressing some

*asked on October 31, 2013* -
## calculas

Use left and right endpoints and the given number of rectangles to find two approximations of the area of the region between the graph of the function and the x-axis over the given interval. (Round your answers to four decimal places.) g(x) = 7 sin x, [0,

*asked on May 7, 2016* -
## Physics

to strengthen his arm and chest muscles, an 82-kg athlete who is 2.0 m tall is doing push ups. his center of mass is 1.15 m from the bottom of his feet, and the centers of his palms are 30.0cm from the top of his head. find the force that the floor exerts

*asked on November 7, 2012* -
## English Grammar

For greetings, is it "Haven't talk to you for a while" or "Haven't talked to you for a while" past tense or not:=?

*asked on November 14, 2008* -
## Statistics

A college statistics class conducted a survey of how students spend their money. They asked 25 students to estimate how much money they typically spend each week on fast food. They determined that the mean amount spent on fast food is $31.52 with a

*asked on October 14, 2016* -
## physical

A box slides downwards at a constant velocity on an inclined surface that has a coefficient of friction uK = .58 The angle of the incline, in degrees?

*asked on July 30, 2013* -
## calculus

If f is the focal length of a convex lens and an object is placed at a distance p from the lens, then its image will be at a distance q from the lens, where f, p, and q are related by the lens equation 1/f = 1/p + 1/q What is the rate of change of p with

*asked on May 6, 2011* -
## calculus

Consider a window the shape of which is a rectangle of height h surmounted by a triangle having a height T that is 1.1 times the width w of the rectangle If the cross-sectional area is A, determine the dimensions of the window which minimize the perimeter.

*asked on April 1, 2013* -
## chemistry

what is the molality of a 10.5% by mass glucose solution?. density of the solution is 1.03g/ml can someone please explain how to do this question. please and thank you

*asked on February 10, 2011* -
## Reading

In adventures of Isabel the only one of Isabel's enemies who survives is a? A.the bear B. the witch C. the giant D. the doctor

*asked on February 8, 2016* -
## Calc 2: Area under the curve

Find the area of the region enclosed between y=2sin(x and y=3cos(x) from x=0 to x=0.4pi Hint: Notice that this region consists of two parts. Notice: I'm getting 1.73762 but apparently that is wrong.

*asked on April 20, 2011* -
## calculus

A box weighing 450 N is hanging from two chains attached to an overhead beam at angles of 70 degrees and 78 degrees to the horizontal. Determine the tensions in the chains.

*asked on February 14, 2010* -
## math 10

a British researcher developed a formula to determine walking or running speed based on hip height and stride length. The formula is s= 0.78l ^1.67/ h^1.17 where s is speed in meters per second l is stride length in meters, and hi is the individual hip

*asked on December 5, 2017* -
## physics

Calculate the net work output of a heat engine following path ABCDA in Figure 14.30, where V1 = 5.0 10-3 m3 and V2 = 20.0 10-3 m3.

*asked on December 6, 2013* -
## Physics

A skateboarder shoots off a ramp with a velocity of 6.7 m/s, directed at an angle of 53° above the horizontal. The end of the ramp is 1.0 m above the ground. Let the x axis be parallel to the ground, the +y direction be vertically upward, and take as the

*asked on October 5, 2011* -
## biology

1. Record your observations of the roots of the bean and radish plants in the appropriate data chart. Be sure to include a sketch of each plant’s roots. Answer: Data Chart: Bean Plant Nodules present? Number of nodules Number of pink nodules Number of

*asked on June 1, 2011* -
## Chemistry

A student is given a sample in lab which contains one of the ions listed below. After adding a few drops ofsolution to part of the unknown sample, the student got a greyish precipitate. After adding a few drops ofsolution to another part of the unknown

*asked on April 6, 2010* -
## Math

A shop owner blends three types of coffee,A,B,C.in the ratio 3:5:7 a) calculate the weight of each type of coffee in 45kg of three blended mixture. b) given that type A coffee cost $7 per kg, type B coffee costs $10 kg and type C coffee costs $13 per kg,

*asked on December 31, 2016* -
## algebra

The loudness, L L, of a sound (measured in decibels, dB) is inversely proportional to the square of the distance, d d, from the source of the sound. Round to 3 decimal places. A person 15 feet from a jetski, it is 75 decibels loud. How loud is the jetski

*asked on February 9, 2016* -
## Physics

A basketball player is running at 5.00 m/s directly toward the basket when he jumps into the air to dunk the ball. He maintains his horizontal velocity. (a) What vertical velocity does he need to rise 0.750 meters above the floor? (b) How far from the

*asked on March 17, 2014* -
## Physics

The planet Krypton has a mass of 7.1 × 1023 kg and radius of 3.3 × 106 m. What is the acceleration of an object in free fall near the surface of Krypton? The gravita- tional constant is 6.6726 × 10−11 N · m2/kg2. Answer in units of m/s2

*asked on December 1, 2011* -
## math

Form a polynomial f(x) with real coefficients, with leading coefficient 1, having the given degree and zeros. Degree: 4; zeros: -4+3i and 1; multiplicity of 2

*asked on July 3, 2020* -
## Math

Convert $e^{-\pi i}$ to rectangular form. Not sure how to start this problem, should I use Euler's formula? Can anyone help provide the steps please? Thanks

*asked on January 11, 2017* -
## Chemistry

How many grams of sodium carbonate are in a sodium carbonate sample that contains 1.773x10^17 carbon atoms? How do I work this out?

*asked on September 22, 2014* -
## Math-PLEASE check my answers

What types of problems can be solved using the greatest common factor? What types of problems can be solved using the least common multiple? Complete the explanation. *** Use the words 'same' and 'different' to complete the following sentences.*** Problems

*asked on September 11, 2014* -
## Chemistry

To identify a diatomic gas (X2), a researcher carried out the following experiment: She weighed an empty 5.3-L bulb, then filled it with the gas at 1.30atm and 27.0 ∘C and weighed it again. The difference in mass was 7.9g . Identify the gas. Express your

*asked on August 20, 2014* -
## chem110

What is the value of the smallest bond angle in XeF4?

*asked on December 6, 2010* -
## English

Choose the sentence that is written in active voice. A. A serious accident was prevented on the highway by Roger's quick thinking. B. Roger's quick thinking prevented a serious accident on the highway. C. A serious accident was prevented on the highway. D.

*asked on November 22, 2015* -
## physics

A large tank is filled with water to a depth of d = 18 m. A spout located h = 13 m above the bottom of the tank is then opened as shown in the drawing. With what speed will water emerge from the spout?

*asked on January 17, 2010* -
## math

Could someone explain topologically equivalent to me. I am to figure out if a pretzel is topologically equivalent to a pencil, a pipe or a trophy and I just don't understand please help

*asked on September 24, 2009* -
## MATH

HOW IS ONE WHOLE,ONE TENTH,AND ONE HUNDREDTH RELATED ?

*asked on May 19, 2015* -
## calc

integral: sqrt (16 + 6x − x^2) dx

*asked on June 27, 2014* -
## physics

A)Eddie the Eagle, British Olympic ski jumper, is attempting his most mediocre jump yet. After leaving the end of the ski ramp, he lands downhill at a point that is displaced 53.0 m horizontally from the edge of the ramp. His velocity just before landing

*asked on January 31, 2014* -
## chemistry

Finding molarity and molality(best answer)? An aqueous solution is prepared by diluting 3.30 mL acetone,(d= 0.789g/mL) with water to a final volume of 75.0 mL. The density of the solution is 0.993 g/mL. What is the molarity, molality and mole fraction of

*asked on October 7, 2011* -
## Algebra

Three quarters are tossed and a tail appears on at least one of them. What is the probability that at least one head appears? Express as a common fraction.

*asked on April 14, 2011* -
## government

Which statement BEST describes the philosophy of Sir Robert Filmer? A. Kings derive their power from the consent of their subjects. B. Kings have a divine right to absolute authority over their subjects. C. Government’s principle duty is to protect the

*asked on September 8, 2014* -
## Chemistry

What is the freezing point of a solution that contains 10.0 g of glucose (C6H12O6) in 100 g of H2O? Kf for water is 1.86oC/m

*asked on July 17, 2012* -
## English

What is the climax of the white knight

*asked on June 4, 2019* -
## Math

Suppose that 32 feet of fencing is available to enclose a rectangular garden., one side of which will be against the side of a house. What dimensions of the garden will guarantee a maximum area?

*asked on January 9, 2017* -
## Physics

A pendulum bob has a mass of 1kg. The length of the pendulum is 2m. The bob is pulled to one side to an angle of 10degree from the vertical. What is the velocity of the pendulum bob as it swings through it's lowest point? What is angular velocity?

*asked on March 10, 2016* -
## physics

A helicopter weighs 3920 newtons, caculated the force on it if it is ascending up at a rate of 2m/s squre ,what wil b force on helicopter if it is moving up with the constant speed of 4m/s .

*asked on September 15, 2014* -
## physics

The velocity of a ball changes from ‹ 8, −5, 0 › m/s to ‹ 7.88, −5.28, 0 › m/s in 0.04 s, due to the gravitational attraction of the Earth and to air resistance. The mass of the ball is 140 grams. I calculated the acceleration and got what is

*asked on June 28, 2014* -
## Physics helppp

Figure 5-53 shows a man sitting in a bosun's chair that dangles from a massless, frictionless pulley and back down to the mans's hand. The combined mass of man and chair is 94 kg. Fig. 5-53 With what force magnitude must the man pull on the rope if he is

*asked on July 14, 2010* -
## Physics

Just before a bouncy ball hits a wall, it is traveling parallel to the ground at 18 m/s, and it then bounces directly backwards at 17 m/s. The interaction time with the wall was 0.40 ms (4.0 x 10-4 s). If the ball's mass is 0.17 kg, what is the average

*asked on June 30, 2018* -
## Math

The perimeter of a rectangular garden is 108 meters. The length is 6 meters longer than twice the width. Find the dimensions of the garden.

*asked on November 1, 2017* -
## Math - Precalculus - Parametric Equations/Geometry

A hockey puck of diameter 3 inches is spinning around its center at a speed of 3 counterclockwise rotations per second. The center of the puck is traveling at a speed of 24 inches per second at an angle of 45 degrees to the positive real axis. (a) At time

*asked on December 11, 2013* -
## math

In 6 hours,an experienced cook prepares enough pies to supply a local restaurant's daily order. Another cook prepares the same number of pies in 7 hours. Together with a third cook, they prepare the pies in 2 hours. Find how long it takes the third cook to

*asked on December 4, 2012* -
## Statistics

Suppose that 40 students take a quiz and everyone in the class scores an 80. The standard deviation of scores for this quiz is: 80 2 0

*asked on October 14, 2016* -
## Physics

In lacrosse, a ball is thrown from a net on the end of a stick by rotating the stick and forearm about the elbow. If the angular velocity of the ball about the elbow joint is 30.0 rad/s and the ball is 1.05 m from the elbow joint, what is the velocity of

*asked on March 17, 2014* -
## math

Mark averaged 60 miles per hour during the 30-mile trip to college. Because of heavy traffic he was able to average only 40 miles per hour during the return trip. What was Mark's average speed for the round trip?

*asked on March 24, 2013* -
## Chemistry

One mole of each of the following compounds is added to water in separate flasks to make 1.0 L of solution. Which solution has the largest total ion concentration? a. aluminum hydroxide b. silver chloride c. sodium chloride d. calcium carbonate e.

*asked on May 9, 2011* -
## Vibration and Waves

1. A girl on a playground swing makes a complete to-and-fro swing each 2 seconds. The frequency of swing is 1. (0.5 hertz) 2. (1hertz) (ANSWER) 3. (2 hertz) And the period is (FROM THE QUESTION BEFORE) 1. (0.5 seconds) (ANSWER) 2. (1 second) 3. (2 seconds)

*asked on January 24, 2010* -
## chemistry

balance equation by electron balancing method cl2 + oh- = cl- + clO3- + h2O

*asked on December 14, 2019* -
## Physics

You are watching your friend play hockey. In the course of the game, he strikes the puck in such a way that, when it is at its highest point, it just clears the surrounding 2.96 m high Plexiglas wall that is 14.5 m away. (Ignore any effects due to air

*asked on July 5, 2015* -
## Geometric Series question? Help!?

A bouncy ball bounces to 2/3 of its height when dropped on a hard surface. Suppose the ball is dropped from 20 m. What is the height of the ball after the 6th bounce? Answer = 1280/729 m OR 1.75 m What is the total distance travelled by the ball after 10

*asked on May 29, 2013* -
## Statistics Question

Consumer Reports rated airlines and found that 80% of flights involved in the study arrived on time (that is, within 15 minutes of scheduled arrival time). Assuming that the on-time rate is representive of the entire commercial airline industry, consider a

*asked on December 14, 2011* -
## physics

A wagon is rolling forward on level ground. Friction is negligible. The person sitting in the wagon is holding a rock. The total mass of the wagon, rider, and rock is 94.0 kg. The mass of the rock is 0.350 kg. Initially the wagon is rolling forward at a

*asked on October 22, 2011* -
## Math

Let U = {a, b, c, d, e, f} Let A = {a, c, e, f} Let B = {c, d, e} C = {e, f} Find each of the following: 1. A’ 2. B′ 3. C′ 4. B ∪ C 5. A ∩ C 6. B ∩ C 7. (A ∪ B)′ 8. A′ ∪ B′ 9. B′ ∩ C 10. A ∪ (B′ ∩ C)

*asked on June 18, 2020* -
## Algebra 1

Jaden has a prepaid phone plan (Plan A) that charges 15 cents for each text sent and 10 cents per minute for calls. 1. If Jaden uses only text, write an equation for the cost C of sending t texts. a. How much will it cost Jaden to send 15 texts? Justify

*asked on September 5, 2017* -
## Trignometry

In Philadelphia the number of hours of daylight on day t (t is the number of days after january 1) is modeled by the function L(t)= 12+2.83sin((2*Pi)/365(t-800) a. Which day have about 10 hours of daylight? b. How many days of the year have more than 10

*asked on April 15, 2017* -
## Chemmistry

Use this percentage to calculate the mass of fluorine (in g) contained in 54.0 g of copper (II) fluoride.

*asked on February 21, 2016* -
## physics

In a police ballistics test, a 10.0-g bullet moving at 300 m/s is fired into a 1.00-kg block at rest. The bullet goes through the block almost instantaneously and emerges with 50.0% of its original speed. What is the speed of the block just after the

*asked on May 13, 2015* -
## math

there are fewer than 6 dozen eggs in a basket. If I count them by 2's there is 1 left over. If I count them by 3's there are 2 left over Three are left if I count by 4s. Four are left if I count by 5s. how many egs are there

*asked on March 31, 2012* -
## Pre-cal

The equation of the line joining the complex numbers -5 + 4i and 7 + 2i can be expressed in the form az + b*overline{z} = 38 for some complex numbers a and b. Find the product ab. Any help?

*asked on September 1, 2014* -
## Chemisrty

What volume of oxygen, measured at STP, can be prepared by heating 2.16g HgO?

*asked on April 10, 2013* -
## Chemistry

What is the activity coefficient of H^+ in a solution containing 0.073 M HCl and 0.0090 M Ca(ClO4)2? What is the pH of the solution? I believe I have to find the ionic strength of the solution first, but I don't know how to find it when 2 solutions are

*asked on February 4, 2013* -
## Chemistry

If the standard enthalpy of combustion of octane, C8H18(l) is -5471 kJ/mol, calculate the enthalpy change when 1.00 kg of octane are burned. the molar mass of octane is 114 g/mol

*asked on October 20, 2012* -
## physics

A coil has an inductance of 9.00 mH, and the current in it changes from 0.200 A to 1.50 A in a time interval of 0.300 s. Find the magnitude of the average induced emf in the coil during this time interval.

*asked on April 27, 2017* -
## Math

Two towns are 420 miles apart. A car leaves the first town traveling toward the second town at 55 mph. At the same time, a second car leaves the other town and heads toward the first town at 65 mph. How long will it take for the two cars to meet?

*asked on April 18, 2013* -
## physics

Joe pushes horizontally on a heavy box across a rough surface at constant speed. Which one of the following statements concerning this situation is false? If Joe stops pushing on the box, the box will stop sliding eventually. If Joe doubles his force on

*asked on June 8, 2014* -
## Maths

Hi, I am just doing some maths revision in light of my maths GCSE resit, which is very soon. I am sitting the higher paper for the first time, so some of the questions towards the end of the paper are very testing of my knowledge. At the moment I am going

*asked on June 5, 2013* -
## math

The quotient of a number and 3, minus 1, equals 5/3. Find the number.

*asked on December 4, 2012* -
## Physics

The blades of a ceiling fan have a radius of 0.348 m and are rotating about a fixed axis with an angular velocity of +1.63 rad/s. When the switch on the fan is turned to a higher speed, the blades acquire an angular acceleration of 2.16 rad/s^2. After

*asked on October 28, 2012* -
## chemistry

what is the density of a solid object with a mass of 1.65 lb and a volume of 170ml?

*asked on September 10, 2010* -
## sra mcguin

Question -- va a viajar a peru tu primo andres? My answer: No, mi primo ya viajo a peru Andres

*asked on January 26, 2008* -
## Math

Suppose T is a transformation from ℝ2 to ℝ2. Find the matrix A that induces T if T is reflection over the line y=−3/2x. Please give me the solution

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

In each of the following, relationships among marked angles are given below the figure. Find the measures of the marked angles. b. m(∠AOB ) is 30° less than 2m (∠BOC ) c. m(∠AOB ) – m(∠BOC ) = 50

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

Scores on a marketing exam are known to be normally distribute with mean and standard deviation of 60 and 20, respectively. The syllabus suggests that the top 15% of the students will get an A in the course. What is the minimum score required to get an A?

*asked on September 25, 2014* -
## Physics

how much energy is required to change 40 g of ice at -10 C to steam at 110 C?

*asked on January 12, 2014* -
## Physics

On a hot summer day in the state of Washington while kayaking, I saw several swimmers jump from a railroad bridge into the Snohomish River below. The swimmers stepped off the bridge, and I estimated that they hit the water 1.5s later. a) How high was the

*asked on October 2, 2011* -
## Math

What is the next number in the pattern 20,000; 4,000; 800; 160?

*asked on January 13, 2011* -
## Chemistry

Calculate K at 25°C for the reactions given below. (a) IO3-(aq) + Fe2+(aq) equilibrium reaction arrow Fe3+(aq) + I2(aq) (b) Zn(s) + Ag+(aq) equilibrium reaction arrow Zn2+(aq) + Ag(s)

*asked on March 25, 2019* -
## MAth

IN RECTANGLE ABCD ,AB=25CM, BC=15CM. IN WHAT RATIO DOES BISECTOR OF ANGLE C DIVIDES AB?

*asked on April 23, 2017* -
## Social Studies Help ASAP Please!

Resistance to Immigration Nativists believed that some immigrants did not fit into American culture because their customs were to different ---> Prejudice and violence grew as the number of Chinese immigrants increased ---> ? Based on your reading, which

*asked on February 25, 2017* -
## phy113

An ungraduated mercury thermometer attached to a millimeter scale reads 22.8 mm in ice and 242mm in steam at standard pressure. What will the millimeter read when the temperature is. 20oC?

*asked on March 26, 2014* -
## physics

9. A stone is thrown at an angle of 30° above the horizontal from the top edge of a cliff with an initial speed of 19.6 m/s. A stop watch measures the stone's trajectory time from top of cliff to bottom to be 6.7 s. How far out from the cliff's edge does

*asked on June 10, 2010* -
## Genetics

If the litter resulting from the mating of two short-tailed cats contains three kittens without tails, two with long tails, and six with short tails, what would be the simplest way of explaining the inheritance of tail length in these cats? Show genotypes.

*asked on May 8, 2019*