rick

This page lists questions and answers that were posted by visitors named rick.

Questions

The following questions were asked by visitors named rick.

tell me about science apparatus They are used in science. You need a much more specific question to get a useful answer. For instance: What is the Hoffman apparatus, and how is it used?

How many electrons must be removed from an electrically neutral silver dollar to give it a charge of +2.8 µC?

An electron and a proton are initially very far apart (effectively an infinite distance apart). They are then brought together to form a hydrogen atom, in which the electron orbits the proton at an average distance of 5.11 10-11m. What is EPEfinal - EPEin...

A car battery has a rating of 200 ampere·hours (A·h). This rating is one indication of the total charge that the battery can provide to a circuit before failing.

A car battery has a rating of 200 ampere·hours (A·h). This rating is one indication of the total charge that the battery can provide to a circuit before failing. What is the total charge (in coulombs) that this battery can provide? Determine the maximum c...

A toaster uses a Nichrome heating wire. When the toaster is turned on at 20°C, the initial current is 1.50 A. A few seconds later, the toaster warms up and the current has a value of 1.22 A. The average temperature coefficient of resistivity for Nichrome...

The average power dissipated in a stereo speaker is 54 W. Assuming that the speaker can be treated as a 4.0- resistance, find the peak value of the ac voltage applied to the speaker.

There is a 0.225 T magnetic field directed along the +x axis and a field of unknown magnitude along the +y axis. A particle carrying a charge of 7.20 10-5 C experiences a maximum force of 0.455 N when traveling at a speed of 2 104 m/s through the region w...

An electric power line carries a current of 1600 A in a location where the earth's magnetic field is 4.0*10-5 T. The line makes an angle of 75° with respect to the field. Determine the magnitude of the magnetic force on a 130 m length of line.

The average emf induced in the secondary coil is 0.10 V when the current in the primary coil changes from 3.2 to 2.0 A in 0.10 s. What is the mutual inductance of the coils?

The coil of a generator has a radius of 0.12 m. When this coil is unwound, the wire from which it is made has a length of 5.5 m. The magnetic field of the generator is 0.10 T, and the coil rotates at an angular speed of 25 rad/s. What is the peak emf of t...

A generating station is producing 1.3*10^6 W of power that is to be sent to a small town located 7.0 km away. Each of the two wires that comprise the transmission line has a resistance per kilometer of length of 5.0*10^-2 /km. (a) Find the power lost in h...

If sin = 4/5 with A in QII, and sin B = -3/5 with B in QIV find cos(A-B)

If sin = -3/5 with A in QIV, find cos A/2

Prove the identity sin (3 pi/2 + x) + sin (3 pi/2 -x) = -2 cos x

In astronomy, distances are often expressed in light-years. One light-year is the distance traveled by light in one year. The distance to Alpha Centauri, the closest star other than our own sun that can be seen by the naked eye, is 4.7 light-years. Expres...

The human eye is most sensitive to light having a frequency of about 5.3*10^14 Hz, which is in the yellow-green region of the electromagnetic spectrum. How many wavelengths of this light can fit across the width of your thumb, a distance of about 2.0 cm?

1.0 X 21 = 21 or 210 because of the decimal point, I just don't remenber how the decimal point works.

A camera is supplied with two interchangeable lenses, whose focal lengths are 35.0 and 150.0 mm. A woman whose height is 1.80 m stands 7.00 m in front of the camera. What is the height (including sign) of her image on the film, as produced by (a) the 35.0...

From a distance of 60 m, a photographer uses a telephoto lens (f = 300.0 mm) to take a picture of a charging rhinoceros. How far from the rhinoceros would the photographer have to be to record an image of the same size using a lens whose focal length is 4...

A law enforcement officer in an intergalactic "police car" turns on a red flashing light and sees it generate a flash every 1.5 s. A person on earth measures that the time between flashes is 2.9 s. How fast is the "police car" moving relative to the earth...

An owl has good night vision because its eyes can detect a light intensity as small as 5.0*10^-13 W/m2. What is the minimum number of photons per second that an owl eye can detect if its pupil has a diameter of 7.0 mm and the light has a wavelength of 545...

An electron and a positron each have a mass of 9.11*10^-31 kg. They collide and both vanish, with only electromagnetic radiation appearing after the collision. If each particle is moving at a speed of 0.55c relative to the laboratory before the collision,...

A laser emits 1.44*10^18 photons per second in a beam of light that has a diameter of 1.98 mm and a wavelength of 524.5 nm. (a) Determine the average electric field strength (b) Determine the average magnetic field strength for the electromagnetic wave th...

this is a sped class. how or how is easiest to teach them?

Which organ sterilizes ingested food? A. Salivary glands C. Pancreas B. Stomach D. Liver (B)

in a 4 1/2 mile relay race there were 9 runners what part of a mile did each run

how many ounces in a cup?

A 114g sample of sucrose undergoes incomplete combustion according to the reaction C12H22011 + 5O2 ---> 4C + 6CO + 2CO2 + 11H2O using the chart of enthalpies of formation determine the enthalpy released by the sample i think that it is a simple enthalpy p...

propanoic acid ch3ch2cooh is a weak acid which has a value for dissociation content of ka = 6.3 x 10^-6 calculate the pH of an aqueous solution of propanoic acid containing 37 g of propanoic acid per litre. i'm stumbled on this one.. i calculated that the...

determine whether the following salts will form acidic, neutral or basic solutions in water. Na2HPO4 CaNO2 NH4CH3COO Al2SO4 NaF Please, i need the answer to this question within 2 hours of when i post this!

Ok I have a bunch of questions, please bare with me and i'd appreciate it VERY much if you could help me with these! 1. Assume that you are given the equations of three planes. Without solving the system, describe a "test" with rationale, that you could u...

An architect is designing the floors for a hotel. Each floor is to be rectangular and is allotted 720 ft of security piping around walls outside the rooms. What dimensions of the atrium will allow an atrium at the bottom to have maximum area?

An object that is tossed downward with an initial speed (velocity) of will travel a distance of s meters, where and t is measured in seconds. Solve for t.

true or false. because resources are plentiful, people must make choices.

Question: Use logical equivalnces to show that the propositions !p -> (q->r) and q -> (p v r) are logically equivalent. I AM SO DAMN CONFUSED! I tried to solve !p -> (q -> r) first and I only got to !p -> (!q v r) I cant see any other rule that would appl...

waterline in my back yard is represented by the equation Y=-1/4x +8 What is the slope of the equation what is the Y intercept of the equation?

Is this true or false? In an experiment involving matched pairs, a sample of 13 pairs of observations is collected. The degree of freedom for the t statistic is 11.

how much money would have to be invested in an account at 3.98% annual interset to achieve a balance of 25,000 in 17 years if a. The account pays simple interest b. the account compound interest qrtly c. the account compounds interest continuously

A 3Kg projectile is fired straight upward from earth's surface with a speed that is one-fourth the escape speed. Neglecting air resistance. a) What is the Kinetic energy of this projectile when it is launched? b) what is the gravitational potential energy...

structured design (pseudocode only) driving a car

Create a 6-slide Microsoft® PowerPoint® presentation, including speaker notes, tracing the nutrition needs of both a man and a woman throughout the various stages of life. Be sure to address what their nutritional needs are: o As infants o As teenagers o...

a sample of a radioisotope had a mass of 100.0 grams. After exactly 24 days, 6.25 grams remained. The half life of the isotope is _________

What is a u square?

what is the concentration of a solution with 5 grams of HBr dissolved in 2 liters of water?

what steps would you take to answer 2(x-3)-17=13-3(x+2)

if 10.0g of NaF and 20.0 g of HF are dissolved in water to make one liter of solution, what will the pH be? For HF, Ka=6.8x10-4.

Factor each of the following trinomials: (14 marks) A)15s2 + 26s + 8 B) x4 – 5x2 – 36 (hint: let a = x2) C) t2 + 4t – 2 D) 2w2 – w – 4

When px^3 – 2px^2 + 3x – p is divided by (x – 1), the remainder is -5. Find p. (2 marks)

When px^3 – 2px^2 + 3x – p is divided by (x – 1), the remainder is -5. Find p.

Let f(x) = ax^3 + bx^2 + 3x – 4. If f(x) is divided by (x – 2), the remainder is 2. When it is divided by (x – 1), the remainder is -2. Find a and b.

Let f(x) = ax^3 + bx^2 + 3x – 4. If f(x) is divided by (x – 2), the remainder is 2. When it is divided by (x – 1), the remainder is -2. Find a and b.

When px^3 – 2px^2 + 3x – p is divided by (x – 1), the remainder is -5. Find p.

Let f(x) = ax^3 + bx^2 + 3x – 4. If f(x) is divided by (x – 2), the remainder is 2. When it is divided by (x – 1), the remainder is -2. Find a and b.

When px^3 – 2px^2 + 3x – p is divided by (x – 1), the remainder is -5. Find p.

Solve the following polynomial inequalities. a) 4x - 5 ≤ 2(x - 7)

Solve the following polynomial inequalities. A) x^3 - 5x^2 + 2x ≥ -8 B)2(x3 - 2x2 + 3) < x(x - 1)(x + 1)

The Pythagorean Theorem gives the relationship between the sides of a right triangle. The following identities show the relationships between the trigonometric functions of a particular angle. sin2 θ + cos2 θ = 1 tan2 θ + 1 = sec2 θ 1 + cot2 θ = csc2 θ Wh...

In a bird sanctuary 41 different special of birds are being studied. Three large bird feeders are constructed, each providing a different type of bird feed. One feeder has sunflower seeds. A second feeder has a mixture of seeds, and the third feeder has s...

The queen asked her cook how many guests had attended a recent banquet. “I do not know, my lady” he said, “but every two guests shared a plate of fruit between them, every three used a bowl of broth among them, and every four shared a platter of beef. I u...

Multiply using Area Models – Draw the model a. 1/3 x 4/5 b. 3/4 x 1/5

Whole numbers can be represented by rectangular arrays of tile. What kind of numbers have more than one rectangular array?

what volume of 1M NaOH is needed for the reaction with 1L of 1M HCl?

7/12, 14/30 approximation which is greater

Final Global Business Plan Paper and Presentation for paraguau

A projectile is shot straight up from the earth's surface at a speed of 1.50×104 .

a state of indiana lotto ticket pays winners $0, $5, $25, and $200 with probabilities of 0.94, 0.03, 0.02, and 0.01 respectivley. the expected value of this ticket is

which metal react most vigorously? metals aluminum, copper, magnesium, lead, tin, zinc 1. which metal will react most quickly? 2. which will take the longest time to react? 3. which will react most vigorously and least vigorously? 4. list metals from orde...

The marketing manager at Massimino & McCarthy, a chain of retail stores that sells men's clothing, is reviewing marketing research data to try to determine if changes in marketing strategy are needed. Which of the following sources of data would be a seco...

The average temperature for the month of April is 65 degrees. The temperatures ranged from 12 degrees warmer or colder. Write and solve an absolute value equation to represent this information. Write you answer in a sentence format to explain your answer.

the slope of a mountain if 10, 560 feet lenghth and 5,280 feet widthe

what is th value of 4!

What is one way that “The Maori: Genealogies and Origins in New Zealand” contrasts with “The Raven and the First Men: The Beginnings of the Haida”?

A theater that is rectangular in shape seats 720 people.The number of rows needed to seat the people would be 4 less if each row held 6 more people.How many people would then be in each row?

graph inequality k<-1

I need an example how to graph for an inequality solution. eq. 5<x+31

solve inequality and graph a-1/4 > 5 3/4

-5+b<-19 solve inequality and graph

a store manager is accipting applications for part time workers. He can hire no more than 14 people. So far he has hired 9 people. Write and solve an inequality to determine how many more people the manager can hire

-4x<-64 4/5h>-2 solve each inequality

A box slides down a frictionless 35 degree incline. Determine its acceleration. If the incline is 10.0 m long and the box starts from rest, how much time does it take to get to the bottom?

Answers

The following answers were posted by visitors named rick.

i don't know what you mean about the charge of the electron? or what number do you times it by.

where are you getting 22.95% and what is delta T

still don't understand where the 20.8V comes into it how u get that?

1.0 X 21 = 21 or 210 because of the decimal point. I just don't remember how it works ?.

still don't understand where does wavelength and number of photons go too? do you divdide them to get energy or what?

how do you figure out and what is the easiest way to teach it.

C (introducing a new concept

thank you very much

2-9 = -7 6 * -7 = -42 1 - (-42) = 43 3 * 43 = 129 I think that's the answer.

velocity = displacement/time 4m/s = 20/time 20/4 = 5s so any time less than 5 seconds is enough to beat vincent. I think that's the answer..

sin^-1(.6) = 36.8 degrees cos36.8 = .80 tan36.8 = .748

someone? anyone? help!

thank you very much. i did 47/74 instead of 37/74. I knew the steps to answer the question but the confusing part was forming the balanced equation because i didn't know how to do it and the question didn't offer one. May I ask how you got that? how do yo...

Thank you sooo much!

(135/180) x 100 = 75% x/(180 + 50) x 100 = (75 +5) x = 184 184 - 135 = 49 so basketball player would have to make 49 out of 50 free throws.

150 dollars/1.2 = 125 euros for the room

looks good to me

I know part B formula but I don't know which mass to plug in for m2? I have no idea how to solve part D? please help.

im sorry i really don't get how you got that

as in where did you get the 13g/12=65

O ok thanks i reaally appreciate it

An n-channelJFET is biased such that VGS= -2V using self bias. The gate resistor is connected to ground

how did you get 40 hours?

9 x 5 adults + 7 (8-5)= 66 45 + 7 (3)kids = 66 45 + 21 = 66 Now I found 5 adults by multiplying 9 x 5=45 just because that's the only way I know... Now I have no idea how to find x other than that. I am trying to help my 3rd grader with that. Please help.

what are the two unit rates that she might compute

If I had to spinners what the possibility of the spinner adding up to 5. If the spinner only had the numbers 1,2,or3.

What is the reaction of the earth pulling down on a pen that is lying on a table

daniel rolls two cubes 36 times. how many times should he expect to roll a 4?

how many glasses of water is 2/5th

The answer is purple because aliens don't wear hats on Sundays.... (common core math) lol

rick rick rick rick rick rick rick rick rick rick rick

off i correct trust me

oof is correct trust me

II HATE YOU wOrK hArD pLaY hArD

never gonna give you up