127,101 results, page 5

### HELP!

The problem using elimination/substitution methods what is the solution set to 3x -2y =-4 and 5x=2y the choices a)(2,-5) b)(-2,-5) c)(2,5) d)(-2,5) Please, Please, Please, HELP! Between a and c I believe it is c is that correct? Yes.

### english

How do you diagram the sentence, My dad is mean, he makes me do push up, someone stop him before I die, please, please, please!

### math

please can you answer this is all about sums and differences of rational algebraic expression...please i need it please ?this is the problem....3/5+4/5=? another x/3-y/3=? another is 7/a+2/a

Ive tried using the formulas my teacher gave me, however I can't seem to get the right answers. Please help! A 1.4-kg block hangs from a spring. A 363-g body hung below the block stretches the spring 2.6 cm farther. What is the spring constant? When the 363-g body is removed ...

### physics

object kicked at 45 degree and travels 82 m b4 hitting the ground. what was its vo? how long was it in the air? how high did it go? please and thanks

### physics

Rubidium forms the postive Rb+ Is this ion larger or smaller then the neutral atom? Explain PLEASE

### Physics

Can someone please tell me how to calculate the percent of error for a set of data points? thanks so much!

### Physics

Can someone please tell me how to calculate the percent of error for a set of data points? thanks so much!

### PHYSICS

Can someone please tell me how to calculate the percent of error for a set of data points? thanks so much!

how do you rearrange this equation weight=T1sin57+[T1cos57/cos23.5]xsin23.5 when you're trying to isolate T1?????

### need physics help

d=2.1 a=? vi=0 and t=.60 and i have to use the formula d=vit+1/2at^2, how do i do this? can you please show work so i can understand.

### physics

What is the period of the hand on a clock that measures the minutes? What is the frequency? Please show work, Thank you, Abbie

### Physics

can you please help me in telling me the uses of each electromagnet wave? like explain each briefly and what are they used for? thankyou

### PHYSICS HELP

1 1200kg car is accelerating at 1.6m/s/s. If the coefficient of friction is .15, what is the force supplied by the engine? please help! urgent!

### physics

show that none of the principal moments of inertia can exceed the sum of the other two Please help me thank you

### Physics

How far above the surface of the earth would you have to be before your weight is reduced by 12.89%? Please Help !

How much time does it take a pulse of light to travel through 120 m of water?

### Physics

Calculate the total energy of 4.0 kg object moving horizontally at 20 m/s 50 meters above the surface. Please help me!!!!!

### Physics (fix)

In a string and pulley problem, will friction increase or decrease the tension.can you please explain if you can?

### physics

What is the momentum of the 200 g cart BEFORE the collision (LEAVE OUT units of kgm/s)? please help.

### physics

Earth is approximately a sphere of radius 6.37 × 106 m. What are (a) its circumference, (b) its surface area, and (c) its volume? please help

A 1250 kg car increases it's speed from 11 m/s to 27 m/s in 5.4 s. - What is the cars acceleration? - How much force is required?

### physics

Liquids exert pressure at Right Angles to the surface of container.Please explain this with an example

Calculate the allowed wavelengths for the emission of a photon initially in the n=3 state in a hydrogen atom

### physics

Fall time under g is sqrt 2h/g. Can someone give a derivation from the equations of motion please? Thanks.

the potential difference across a load is 9V. explain what this means in more fundamental terms.

### physics

damon,reiny,steve,ms sue.plz get a solution 2 my question please itz urgent!!!

### Physics

What is the centripetal acceleration of an automobile driving at 40 km/h on a circular track of radius 20m? Help ASAP please!!!

### physics

A boy sitting on the edge of a vertical cliff fires a rock with a slingshot at a velocity of 16.45758956 m/s and an angle of 59.78 degrees above the horizontal. The rock lands in a lake at the base of the cliff, a horizontal distance of 89.67 meters beyond the base of the ...

A 5.00 kg ball (ball 1), moving to the right at a velocity of +4.00 m/s on a frictionless table, collides head-on with a stationary 7.60 kg ball (ball 2). Find the final velocities of the balls if the collision is as specified below. (a) elastic collision ball 1 = -.825 ball 2...

### physics

Two hypothetical planets of masses m1 and m2 and radii r1 and r2, respectively, are nearly at rest when they are an infinite distance apart. Because of their gravitational attraction, they head toward each other on a collision course. Note: Both the energy and momentum of the ...

In the quantum mechanical picture of the hydrogen atom, the orbital angular momentum of the electron may be zero in any of the possible energy states. For which energy state must the orbital angular momentum be zero? n = 1 n = 2 n = 3 n = 4 Give your reasoning. I am not sure ...

### Science

Solve the system of equations algebraically. Show all of your steps. y=x^2+2x y=3x+20 Can someone please explain to me how to do this? I want to actually learn it, please. Thanks! :)

A mass of m1 = 12 kg is placed on an incline with an inclination angle of 50 degrees, a coefficient of kinetic friction of 0.16, and a coefficient of static friction of 0.89. m1 is tied to a rope which runs parallel to the incline and runs over a pulley to a hanging mass of m2...

A 16kg sled starts up a 28 degree incline with a speed of 2.4m/s . The coefficient of kinetic friction is = 0.27. part a)How far up the incline does the sled travel? part b)What condition must you put on the coefficient of static friction if the sled is not to get stuck at the...

A 16kg sled starts up a 28 degree incline with a speed of 2.4m/s . The coefficient of kinetic friction is = 0.27. part a)How far up the incline does the sled travel? part b)What condition must you put on the coefficient of static friction if the sled is not to get stuck at the...

### College Physics

A speck of charged dust with a mass of 39mu g. is kept levitating by putting it in an electric field. If you must apply a field of 10 N/C to keep it suspended in mid-air, what is the charge on the speck of dust? Can someone please help soon? I got this wrong on my last test ...

1) Find the period and the amplitude. y= 3 sin 2x Please explain!!! I do not know how to do this.

### Math

How to convert into polar form? z = 1 - i w = 1 - √3i

### English

1. Help me, please? 2. Will you help me, please? 3. Help me, please. ------------------------- Does #1 mean #2? Because of the question mark, #1 is different from #3, right?

Can you please explain your answer. How did you get blue lamda. Is it because red and green makes blue? How do I find the value of blue lambda? A mixture of red light (vacuum = 661 nm) and green light (vacuum = 551 nm) shines perpendicularly on a soap film (n = 1.35) that has ...

### Physics-Kinetic energy

Two 2.0 g bullets are fired with speeds of 40.0 m/s and 80.0 m/s, respectively. What are their kinetic energies? Which bullet has more kinetic energy? What is the ratio of their kinetic energies? A car has kinetic enery of 4.32* 10^5 when traveling at a speed of 23m/s. What is...

CONVERT : 1.67KG =___MG 2.70MM=___KM 3.55 DAYS=___MINS 4.37 FAHRENHEIT=___KELVIN BETTER IF WITH SOLUTIONS PLEASE AND HOW TO DO PLEASE

The tires of a car make 63 revolutions as the car reduces its speed uniformly from 94.0 km/h to 58.0 km/h. The tires have a diameter of 0.88 m. What was the angular acceleration of each tire? And If the car continues to decelerate at this rate, how much more time is required ...

A 5.00 kg ball (ball 1), moving to the right at a velocity of +4.00 m/s on a frictionless table, collides head-on with a stationary 7.60 kg ball (ball 2). Find the final velocities of the balls if the collision is as specified below. (a) elastic collision ball 1 ball 2 (b) ...

### physics

DRWLS: PLEASE SEE ADDITIONAL INFO AT THE BOTTOM its the second part of the question that I don't understand: according the graph shown, the net force acting on an object varies wth the object's displacement. Calculate the work down by the force on the object at the various ...

### Plz help Physics-bobpursley

A 200W lamp is totally immersed in 1500gm of water. How much will the temperature of the wtaer rise in 3 mins? Neglect heat losses from the water. Please don't put names in the subject...you limit yourself to who can respond, when others may be able and available. Again, ...

A certain wave is incident on an interface at an angle of 40 deg. The wave emerges into the other material at an angle of 30 deg. Crossing the interface, the wave: a. increased speed b. reduced speed c. maintained constant d. more info is needed I think reduces its speed, but ...

### Physics

i saw this question from physics book, can someone please help me solve this.. thank you.. A man pulls a 500 Newton block up a plane inclined 300 with the horizontal with a force of 300 Newton parallel to the plane. What net force tends to pull the block up the plane?

4.A mass of one kg of nickels has a monetary value in the US \$ of approximately: a. \$1 b. 10 cents c. \$10 d. \$1000 is it c?

### physics Again

bobpursley can you please check my reply to your post about my question? I am not sure if I did my equation correctly. Thanks

### physics

Calculate the energy released in the fusion reaction 2 3 4 1 1 H + 1 H->2 H +0 n. The atomic mass of 3 1 H (tritium is 3.016049 u. I am lost! help please!

### Physics

calculate the magnitude of the resultant of a pair of 100-km/h velocity vectors that are at right angles to each other. Please help me! thanks!

### physics

a guy throws a ball up and catches it 3.5 seconds later. what is the max height and initial velocity. Please help!

how do you measure uncertainy?? for instance.. if the average was .15 and the highest value among the data was .16 and the lowest is .13... how do you find the +-??

### PHYSICS

The force applied by the e-brake is F(eb) = m*a(eb) = -8.13*1452 = -12,100 N I didn't get the same answer - I got 11,804.76....please check

### physics (electric charges)

Hi, How can you charge an electroscope negatively? Is it by using a positively charged rod? Can someone please help me? Thank you :)

### physics (electric charges)

Hi, How can you charge an electroscope negatively? Is it by using a positively charged rod? Can someone please help me? Thank you :)

### physics

what is your age in seconds? this is a conversion problem. someone help please with all the multiplication and division... very confused. THANK YOU

### Physics

the relationship between linear speed and net force is inverse right? can someone explain why to me please.

### physics

What is the mass of a lead sinker witha volume of 3cm3? please show work I calculated 11.3*3 = 33.9 Is this correct.. Thank you.

show how you would you arrange to find f in terms of v,m and r from four equations below. f=1/t, f=ma,v=2piR/T,a=v^2/R Thanks

### science physics

i don't get how to solve this please help me Two resistors, 47 Ù and 82 Ù, are connected in series across a 45 V battery. What is the current in the circuit?

Find the power input of a force F=(7 N)ˆý + (3 N) ˆk acting on a particle that moves with a velocity v = (6 m/s)ˆý. Answer in units of W

When a 0.35 kg baseball is hit, its velocitychanges from 21 m/s to -29.5 m/s. What is the magnitude of the impulse de-livered by the bat to the ball? Answer in units of N · s

When the object is placed beyond 2f, where should you put your eyes for getting the clear image of it?

### Basic Physics

I don't understand how to work this problem out: Find x-component of vector a ⃗ = (7.0m/s 2 , - y-direction) Please help

### physics

car doing 60 mph and skids for 52.3 meters what is the speed at end of skid co/friction is 0.693 urgent help please

### Hurricane Project for Physics Class

1) Please describe the typical path(s) for hurricanes. Is this part of the pattern of convection?

### PHYSICS

without air resistance maximum range of projectile is obtained with an angle of ???? Can you please fill in the blank THANK YOU

### physics

please help The power rating of an electric motor which draws a current of 5 amperes from a 240-volt line is? a. 12.0 kW b. 1.2 kW c. 48.0 kW d. 4.8 kW

### Physics

What is the pressure at a depth of 80 m in the ocean? The density of seawater is 1. 03 × 10 3kg/m3. Please express your answer in units of atm.

### Physics

What is the pressure at a depth of 80 m in the ocean? The density of seawater is 1. 03 × 10 3kg/m3. Please express your answer in units of atm.

### Physics Plz help me

If a galaxy is traveling away from us at 2.0% of the speed of light, roughly how far away is it? t= light years I got 2.4x10^8 light years but its wrong please help me out...thank you Physics Plz help me - Anon, Monday, May 6, 2013 at 9:17pm 5.98x10^6 Thatz still wrong

### physics

Two small pith balls, each of mass m = 11.2 g, are suspended from the ceiling of the physics lab by 1.7 m long fine strings and are not moving. If the angle which each string makes with the vertical is è = 30.4°, and the charges on the two balls are equal, what is the ...

### physics

Two small pith balls, each of mass m = 11.2 g, are suspended from the ceiling of the physics lab by 1.7 m long fine strings and are not moving. If the angle which each string makes with the vertical is è = 30.4°, and the charges on the two balls are equal, what is the ...

### Physics

How much heat does a freezer need to remove from 1kg of water at 40°C to make ice at 0°C? (You will need to use the specific heat of water to drop the temperature first, before trying to make the phase change!) Show your work. Please help! Also, this site isn't about giving ...

### biology

are van der waals forces and ionic bonds similar ? How ? and are there also any difference beetween them? please please please help my brain is spinning! thank you so much!

### algebra

Help me please I get confused with the positives and negatives. Please be kind to check my work and let me know where am I going wrong -4x + 10 = 58 -4x + 10 -10 = 58 -10 (is it - or +10?) -4x = 48 or 68 (do i add 58&10 or sub?) -4x/-4 = 48/-4 or 68/-4 (is the 4 -or+) x=12 or ...

Could you please explain to me: how was the structure (Collosus of Rhodes) effective for it's stated purpose? I don't understand the question and I need something for my project. Pleaseee.

### Math

Is this a trick question? I need to write the number 79 in short word form, would it be seventy 10's and one 9 or 10 sevens and 9 ones? Please, please, please help me Thank You

### algebra

Solve by factoring: x^2 + 5x = −6 Please help! I have a test next week and this is one of the practice problems and I do not understand this. I will not graduate unless I get a C. Please, Please!! Thank you

### Physics

please show me how to work out this problem: A roller coaster moves 85 m horizontally, then travels 45 m at an angle of 30.0 degrees above the horizontal. what is its displacement from its starting point? use graphical techniques. the answer is 126 m at (1.0 * 10^1) above the ...

### Physics

Can someone please help me sort out this problem? "A boy standing at the equator jumps vertically into the air. Does he land in the exact same spot after landing?" I'm thinking that when he jumps he is also moving horizontally with the earth and so he will land in the same ...

A system does 210 J of work on its environment and gains 80.6 J of heat in the process. Find the change in the internal energy of (a) the system and (b) the environment. Physics(Please respond) - Elena, Thursday, June 21, 2012 at 2:33am ÄU = Q - W Where ÄU is the change in ...

Find sin(θ), cos(θ), tan(θ). Assume a = 40, b = 9, and c = 41. (Do not use mixed numbers in your answers.) Okay for some reason I keep getting this problem wrong. For sin(θ) I put 9/41, but it's wrong. Could someone please tell what I did wrong.

Can someone help break this down.. Please tell me if what I identified is so far correct. Also what equations should I use??? x1= 10m x2=? v1= 1.2 m/s v2=? a= -9.8 m/s^2 t= ? 1.) a diver runs horizontally with a speed of 1.2 m/s off a platform that is 10.0 meters above the ...

in physics terms what does vacuum mean?? i thought they meant a vacuum sweeper?? huh? The question is " The same object is dropped in a vacuum and then in air. Whaich of the parameters( distance,velocity,acceleration) vary and which remain constant during succeding seconds of ...

### Physics

A vertical spring with a spring constant of 450 N/m is mounted on the floor. From directly above the spring, which is unstrained, a 0.30 kg block is dropped from rest. It collides with and sticks to the spring, which is compressed by 3.0 cm in bringing the block to a momentary...

### Physics

Please help. Thanks. 1. Volt meter measures the potential between two large parallel plates to be 60 volts. The plates are 3cm apart. Find the magnitude of the electric field between them. 2. What work is done when 5C is raised potential by 12.45 volts? * I really don't have ...

### Physics

Please help. Thanks. 1. Volt meter measures the potential between two large parallel plates to be 60 volts. The plates are 3cm apart. Find the magnitude of the electric field between them. 2. What work is done when 5C is raised potential by 12.45 volts? * I really don't have ...