Me and I

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

Questions

The following questions were asked by visitors named Me and I.

Guide me through this plz. A single 1,300 kg cargo train car is rolling along a train track at 2.0 m/s when 400 kg of coal is dropped vertically into it. What is its velocity right afterward? Assume a closed system. (Points : 1) 1.5 m/s 2.0 m/s 6.5 m/s 0....

Am I correct? Two carts have a compressed spring between them and are initially at rest. One of the carts has total mass, including its contents, of 5.0 kg, and the other has total mass of 3.0 kg. If the 3.0 kg cart is moving at 3.0 m/s after the spring i...

Am I correct? Which statement explains why a bicycle is stable when a rider pedals quickly? (Points : 1) The angular momentum vector resists directional change. <------- Applying a torque does not change the angular velocity of the wheel. A rotating objec...

It has a graph but i cant paste it on here, could you guide me through plz Which is a root of f(x) = 0 with a multiplicity of 2? -4 -3 3 4

Can anyone please teach me how to divide polynomials using long division? It's quite confusing. Like give me a problem to solve and guide me through it.

I need help with my lab, it's telling me to measure the mass of cup 1, but i don't understand how to measure it... I have a digital scale does that measure mass? or is there a certain equation to measure it?

(30)(Cm)Δ+(335.5)(4.18)Δ(21)=0 I need to find the specific heat of the masses, but i don't know how to, i'm currently doing a lab and these are the mass and temp. numbers that i plugged in...

How would i solve this? (30)(Cm)Δ+(335.5)(4.18)Δ(21)=0

Help please, I don't understand how to do this... Give an example of an arithmetic sequence that is found in the real world. Find the common difference and write a recursive and iterative rule for the sequence. Use one of the rules to find another term of...

How much heat is required to completely boil away 0.200 kg of water (Hv = 2.26 × 10^3 kJ/kg)? (Points : 1) 4.52 × 102 kJ 2.26 × 103 kJ 4.52 × 103 kJ 1.13 × 104 kJ

I don't understand this question... What is the change in entropy for a system that has 250 J of heat added to it at 25°C? (Points : 1) 10 J/K 0.84 J/K 0.84 J/K 10 J/K

Help please A 200.0 g copper block absorbs 2.34 × 10^3 J of heat to raise its temperature by 30.0 K. What is the specific heat of copper?

Help me understand this please You have a 2.00 kg block of lead. Lead melts at 327.5°C. CPb = 130.0 , and Hf for lead is 2.04 × 10^4 J/kg. Say you start at room temperature (25.0°C). How much heat must you transfer to melt all the lead?

Help me with this, please... A ball is dropped vertically from a height of 80 meters. After each bounce, the ball reaches a maximum height equal to 60 percent of maximum height of the previous bounce. a. Write the first three terms of the sequence. Explai...

Help me please I'm stuck on this question 2.In a thunderstorm at 20.0°C, Karen sees a bolt of lightning and hears the thunderclap 3.00 s later. How far from Karen did the lightning strike? Show your work.

Last question i'm stuck on please help me through this. Five waves pass a dock in 2.0 s. If the waves are traveling at 10.0 m/s, then what is the wavelength of the waves?

Help me with this question please There are 12 red checkers and 3 black checkers in a bag. Checkers are selected one at a time, with replacement. Each time, the color of the checker is recorded. Find the probability of selecting a red checker exactly 7 ti...

Please help me out with this The numbers 1 through 50 are written with red marker on slips of paper while the numbers 51 through 100 are written with blue marker on slips of paper. All the papers are put into a bag and shuffled. One card is randomly selec...

am i correct? 1(2x)^3 + 3(2x)^2*(-5y)^1 + 3(2x)^1*(-5y)^2 + 1(-5y)^3 answer (2x-5y)^3

Help me with this please There are 12 red checkers and 3 black checkers in a bag. Checkers are selected one at a time, with replacement. Each time, the color of the checker is recorded. Find the probability of selecting a red checker exactly 7 times in 10...

How would i do this? Use the binomial theorem to expand (2x – 5y)^3

What was the role of the northwest ordinance and what was its effect on the banning of slavery?

Help me please The table shows the distance and costs of flights for a given airline with the same starting destination and different ending destinations. Distance (miles) 1281 2796 790 150 3211 7810 812 210 7742 3578 1346 3214 Cost (dollars) 473 683 508...

Please help me go through this F = q1q2/r^2, i know this is the equation, but i don't know how to get the answer, please help. What is the electric force between a +2 µC point charge and a –2 µC point charge if they are separated by a distance of 5.0 cm?...

Help needed Which of the following is equivalent to one ampere? 10 s/10 C 10 C/10 m 1.5 C/1.5 s 15 C/10 s

am i correct? A stream of moving charges results in a current of 5.6 A. How long does 116 C of charge take to flow past a fixed point? 2.0 s 5.6 s 11.2 s 21 s <--- i believe its D, because 116 C/5.6 A = 20.7 s

Am i correct? Which of the following is a reasonable power rating on an electric oven? 220 V 8.0 A <-- this one seems reasonable 10.0 kW 50.0 kW-h

Help me with this please When a 20 V battery is hooked up to a 10 Ω resistor in a circuit, how much current flows through the circuit? 0.5 A 2 A 20 A 200 A

I'm confused with this one, here's what i got 45.0 v/ 40.0Ω = 1.125 A is the answer b? A 10.0 Ω resistor is in parallel with a 30.0 Ω resistor and supplied by a 45.0 V battery. What is the total current drawn from the battery? 0.003 A 1.10 A 6.00 A 338 A

A 10.0 Ω resistor is in parallel with a 20.0 Ω resistor and supplied by a 9.0 V battery. What is the current passing through the 20.0 Ω resistor? (Points : 1) 0.45 A 0.90 A 1.35 A <--- 6.00 A

what is AB? A= 3 , 5 B = 4 2 , 8 -7 this is a matrix, but it wont let me put in the brackets

A 10.0 Ω resistor is hooked up in series with an 8.0 Ω resistor followed by a 27.0 Ω resistor. The circuit is powered by a 9.0 V battery -Calculate the equivalent resistance. -Calculate the voltage drop across each resistor in the circuit.

A 15.0 kΩ resistor is hooked up to a 45.0 V battery in a circuit with a switch. a.) What is the current flowing through the resistor? b.) What is the power dissipated by the resistor?

Help me with this question, please How will the total voltage of a string of light bulbs in series change as you add more bulbs to the string? A. The total voltage will decrease B. The total voltage will stay the same C. The total voltage will increase d....

am i correct? An electric oven has a resistance of 10.0Ω and a voltage of 220 V. How much current does it draw? A. 2.2 A B. 22 A <--- c. 220 A d. 2,200 A

Help me with this please A 10.0 Ω resistor is in parallel with a 20.0 Ω resistor and supplied by a 9.00 V battery. What is the total current passing through the circuit? A. 0.38 A B. 0.75 A C. 1.35 A D. 6.00 A

One 10.0 Ω resistor is wired in series with 10.0 Ω resistors in parallel. A 45.0 V battery supplies power to the circuit. What is the total current through the circuit? A. 3.0 A B. 1.5 A C. 0.75 A D. 0.33 A

What is the equivalent resistance of a parallel circuit with a 5.0 kΩ resistor, a 2.5 kΩ resistor, and 10.0 kΩ resistor? A. 0.10 kΩ b. 0.83 kΩ c. 10 kΩ d. 1.4 kΩ e. 18 kΩ

Am i correct? If a 10.0 kW device pulls 20.0 A of current, what voltage exists across it? A. 5.0 *10^0 V B. 5.0 *10^1 V C. 5.0 *10^2 V D. 5.0 *10^3 V <---

Which of the following is an appropriate measure of electric power on a toaster label? A. 110 V B. 2.0 A C. 220 W D. 55 Ω

Help me with this please A 6.0 m section of wire carries a current of 5.2 A from east to west in the earth's magnetic field of 1.0 × 10^-5 T at a location where the magnetic field points south. In which direction does the magnetic force act on the wire? n...

Help please The center of a circle is at (-5 , 1) and it has a radius of 9. What is the equation of the circle? A.(x-5)^2+(y+1)^2= 81 B.(x-5)^2+(y+1)^2= 3 C.(x+5)^2+(y-1)^2= 81 D.(x+5)^2+(y-1)^2= 3

Help please A wire carries a current of 5.2 A from east to west through a 6.0 m section of wire in the earth's magnetic field of 1 × 10^-5 T at a location where the magnetic field points south. What is the magnitude of the magnetic force acting on the wir...

with this one i'm confused i'm not sure if it's b or d The current in a solenoid is changed from 1.1 A to 4.4 A. By what factor does the magnitude of the magnetic field inside the solenoid increase? 2 4 0.5 0.25 1.1/4.4= 0.25 0r 4.4/1.1= 4

Am i correct? A plane intersects only one nappe of a double-napped cone. It is neither perpendicular to the cone's axis nor parallel to its generating line. Which conic section is formed? point circle ellipse <--- parabola

Am i correct? My work 0.10/0.20= .5 = 1/2 or is it the other way around? .20/.10? Suppose a magnetic field of 0.20 T is applied to the area within a circular loop of wire. The strength of the field is then changed to 0.10 T. By what factor is the magnetic...

I'm not really sure on this one... Am i correct? A maglev train requires which of the following? A. track and the train must have the different magnetic poles B. track and the train must have the same magnetic poles <--- C. magnetic poles must alternate b...

Am i Correct? 2.0 cm*.044T*/.10 s= 0.88 V Each side of a square loop of wire measures 2.0 cm. A magnetic field of 0.044 T perpendicular to the loop changes to zero in 0.10 s. What average emf is induced in the coil during this change? A. 1.8 V B. 0.088 V...

Help please How do the dark lines of an atom's absorption spectrum relate to the bright lines of its emission spectrum? A. The bright lines are at the same energies as the dark lines. B. The dark lines are at higher energies than the bright lines. C. The...

Bernardo divided one polynomial by another, as shown below. (9x2-9x-10)/(3x+2) What is the quotient? A. 3x-1 + -8/3x+2 B. 3x-1 + -12/3x+2 C. 3x+5 D. 3x-5

How would i solve this? A 10.0 kg ball falling at 10.0 m/s hits a pile of feathers and comes to a complete stop in 10 s. What force does the pile of feathers exert to stop the ball? 10 N 20 N 100 N 200 N

A forklift exerts an upward force of 2.00*10^3 N on a box as it moves the box 5.00 m higher. How much work does the forklift do? 500 J 1.00*10^3 J 1.00*10^4 J <--- 0.00 J

A singer moves a note up one octave. How has the sound changed? The amplitude has decreased The wavelength has increased The speed has increased The frequency has increased <-- im not sure, but i'm thinking that it's this one

Okay last question I need help with Monochromatic light of 605 nm falls on a single slit, which is located 85 cm from a screen. The first dark band appears at 5.4 mm from the center. How wide is the slit? 0.001 mm 0.050 mm 0.095 mm 1.50 mm

Consider the function f(x) = x4 – 3x3 – 7x2 + 15x + 18. Use synthetic division to divide f(x) by x – 3. Use the answer to explain whether or not x – 3 is a factor of f(x).Factor f(x) completely.

Consider the system below. {4x-2y=-12} {3x-y=-3} Solve the system by using a matrix equation.

An object is 30.0 cm to the left of a convex lens with a focal length of +8.0 cm. Calculate the distance from the lens. Would it be upright or inverted?

Answers

The following answers were posted by visitors named Me and I.

OK, thank you, I understand :)

I believe these are correct answers. So, i'll stick with them. :)

Ok :), thank you

i believe it could be A or C, i'm not sure though :(

ok, i got it right!

OK, thank you! :)

the scale is in kilograms, thx for helping me understand :)

thank you so much!! :)

nvm.. i found this one out...

2,340 / 0.20 / 50.0 = i got 234 as an answer?? is it right?

nvm, i think my above answer is wrong i got another answer .39 J/g*k is this right???

nvm, i think i found this one out :)

thank you so much :D, you really helped me out

how did you get 4m?

ok, thank you for explaining

ok thank you so much for showing me how to solve this!!! :)

Ok,thank you guys! :)

so the answer is 0.0017?

oh nvm srry posted wrong one i already found out how to do this one

(9x 10^9)/(.05m)^2, is this what i should be calculating?

okay great, thank you :)

nvm got this one

wouldn't it be b?

okay, thx, i take online school and it's much harder for me

thank you, i actually understood how to do this from your last post on my other question.

nvm i got this one

okay, thx for the help :)

4= x - 4 +4 +4 8= x

20/3= 6.666 9/6.666 c?

thx, i did not know that, so the answer is D :)

ohh oops, i did 15/45, thank you, Damon

thx, MathMate and Damon :)

10x10^3 W 10,000/ 2A = 5000 which would be D right?

i mean its, C :) 10,000/ 20 A = 500

thank you, Damon :)

thx, you helped me out a lot :)

thank you, Damon :)

nvm i got this one, i think 5.2*6.0*.0001 .000312= 3.1*10^-4 N so is this A?

thank you, Steve :)

okay great, thx

nvm i got this one

nvm, i think i figured this one out :)

oh okay, thanks Damon :)

i'm thinking it's c?

thank you, Steve :)

I appreciate the help thank you, Damon