Friday

April 18, 2014

April 18, 2014

Total # Posts: 61

**algebra**

20+2x/5-x For what value of x is the rational expression below equal to zero?

**geometry**

If J is the midpoint of MN and JM=5x-5 and JN=4x+2, find the length of MN.

**geometry**

If P is the midpoint of RS and RS=17x-8 and RP=8x+1, find the values of x and PS.

**geometry**

Points A, B, and C are collinear, and C is between A and B. If AB=8x-4, BC=x+2, and AC=x^2, find the values of x.

**math**

When 6 gallons of gasoline are put into a car's tank the indicator goes from 1/4 of a tank to 5/8. What is the total capacity of the gas tank?

**physics**

An electron is accelerated in the uniform field E = 2.0 x 104 N/C between two parallel charged plates (Negative charged plate is on the left and positively charges plate is on the right). The separation of the plates is 1.5 cm. The electron is accelerated from rest near the ne...

**physics**

Imagine a car involved in a head-on crash. The driver, whose mass is m, is to be brought uniformly to rest within the passenger compartment by compressing an inflated air bag through a distance sc. Write an expression for the average force exerted on the bag in terms of m, vi,...

**physics**

Show that if a satellite orbits very near the surface of a planet with period T, the density (mass per unit volume) of the planet is p(rho)=3pi/(GT)^2

**physics**

If the mass of the Moon is 7.4 x 1022 kg and its radius is 1.74 x 106 m, compute the speed with which an object would have to be fired in order to sail away from it, completely overcoming the Moon’s gravity pull.

**physics**

An 8.0 kg puck floating on an air table is travelling east at 15 cm/s. Coming the other way at 25 cm/s is a 2.0 kg puck on which is affixed a wad of bubble gum. The two slam head-on into each other and stick together. Find their velocity after the impact. How much kinetic ener...

**physics**

A +5.7 C and a -3.5 C charge are placed 25 cm apart. Where can a third charge be placed so that it experiences no net force? (Restrict your analysis to a linear one.)

**physics**

Four 7.5 kg spheres are located at the corners of a square of side 0.60 m. Calculate the magnitude and direction of the gravitational force on one sphere due to the other three.

**physics**

If a negative charge is initially at rest in an electric field, will it move towards a region of higher potential or lower potential? What about a positive charge? How does the potential energy of the charge change in each case?

**physics**

Why do you lose weight when you enter a tunnel passing through a mountain tunnel or walk inside a skyscraper?

**physics**

we are hurt because wen the weight falls on our hand it applies force on our hand but when the hand tries to pass the force over to the table it does not pass . this is because the force of the table on the hand is higher than the force of the hand on the table.......is this c...

**physics**

It is fairly easy to catch a 20 N steel weight dropped from a height of 0.25 m or so. But if you attempt to catch the weight while resting your hand flat on a table, you are likely to be injured. Explain.

**physics**

the square shape is for mu.....

**physics**

Point X and Y are 30.0 mm and 58.0 mm away from a charge of +8.0 C. a. How much work must be done in moving a +2.0 C charge from point Y to point X? b. What is the potential difference between points X and Y? c. Which point is at the higher potential?

**physics**

m nt good at physics .....i don't understand physics so well .....i try to do the problems but they don't make sense at all .....so i ask it here ...and wen someone helps me ...i understand them and then only write them ......m not cheating .....i just need help to und...

**physics**

Point X and Y are 30.0 mm and 58.0 mm away from a charge of +8.0 C. a. How much work must be done in moving a +2.0 C charge from point Y to point X? b. What is the potential difference between points X and Y? c. Which point is at the higher potential?

**physics**

thanx elena :-)

**physics**

Two identical charges, q1 = q2 = 6.0 C, are separated by 1.0 m. a. Calculate the electric field and electric potential difference at point P, midway between them. b. Replace one of the charges with a charge of the same magnitude but opposite sign and repeat the calcula...

**physics....plzzz help**

thanx elena :-)

**physics....plzzz help**

To move a charge of +180 nC from a position where the electric potential difference is +24 V to another position where the potential difference is +8 V, how much work must be done?

**physics**

thanx elena :-)

**physics**

If the electric potential energy between two charges of 1.5C and 6.0 C is 0.16 J, what is their separation?

**physics**

Thanx elena for all the answers :-)

**PHYSICS**

can u pls explain to me y is it the and B) ....thank you very much elena .... :-)

**PHYSICS**

What major obstacle did Henry Cavendish face when measuring the gravitational force between two objects on Earth? A) The masses required had to be very small. B) The gravitational force between the two masses was very small. C) The distance between the two masses had to be ext...

**PHYSICS**

Two balls collide on a horizontal, frictionless table. Ball A has a mass of 0.175 kg and travelling at 1.20 m/s [E 40o S]. Ball B has a mass of 0.225 kg and is travelling at 0.68 m/s [E]. The velocity of ball B after collision is 0.93 m/s [E 23o S]. What is...

**physics....**

A 32.0 kg child descends a slide 4.00 m high. She reaches the bottom with a speed of 2.40 m/s, was the mechanical energy conserved? Explain your reasoning and identify the energy transformations involved.

**physics**

Jane hopes to meet Tarzan by sliding down a rope, made of nylon stockings, from her treetop home. The stockings will break if the tension in them exceeds 400 N. Jane has a mass of 60 kg. What is the maximum acceleration with which she can slide down the stocking rope?

**physics**

Two toboggans are pulled across the ice with a force of 1.2 x 102 N. The rope of the toboggan makes an angle of 55o with the horizontal. The first toboggan has a mass of 25 kg, and the second toboggan has a mass of 16 kg. Assume that the ice surface is smooth enough to be cons...

**physics**

A 1000 kg car is travelling on the highway at a constant speed of 110 km/h. The highway makes a turn that is banked at an angle of 10o and has a radius of 160 m. What is the coefficient of friction between the car tires and the pavement in the curve?

**physics**

A mass of 300 g is attached to a string that is 1.21 m in length. The mass is whirled in a horizontal circle on a surface and completes 7.00 rotations in a time of 2.71 s. The force of tension in the string is 92.7 N. Determine the force of friction between the mass and the su...

**physics**

A car is driving up a curvy mountain road. If the car navigates at the same speed two corners that have the same radius of curvature, but the second curve is banked at twice the angle of the first, what effect will this have on the vehicle?

**physics**

You want to design a curve, with a radius of curvature of 35.0 m, so that a car can turn at a velocity of 15 m/s on it without depending on friction. At what angle must the road be banked?

**physics**

A motorcycle stunt rider wants to do a loop-the-loop within a vertical circular track. If the radius of the circular track is 10.0 m, what minimum speed must the motorcyclist maintain to stay on the track? Suppose the radius of the track was doubled. By what factor will the mo...

**physics**

A space shuttle orbiting Earth at an altitude of 295 km completes an orbit in 90.0 min. Calculate its acceleration and compare it to the acceleration at Earth’s surface.

**physics**

bt how do u find the mass......the mass is not given in the question

**physics**

Thank you.... :-)

**physics**

A wet bar of soap slides freely down a ramp 2.0 m long inclined at 6.8o. How long does it take to reach the bottom? Neglect friction.

**physics**

Two equal weight monkeys each hang from the ends of a rope passing over a weightless, frictionless pulley. If one accelerates up the rope, what happens to the other?

**physics**

Devise a method for measuring the coefficient of friction between two surfaces using an inclined plane

**government**

. Describe two ways the federal bureaucracy helps to shape laws passed by Congress.

**Math**

thanks

**Math**

There are 28 pears on 4 trees. There are the same number of pears on each tree. How many pears on each tree? If Jomel picks 10 pears, how many pears will be left on the trees? My answers: 7 pears on each tree. 18 pears will be left on the trees. Is this correct?

**priciples of business**

how to make a project presentation on , International Organization Enviornment

**Informal Logic**

21{4[1(10)54]}> Choose the pair of words/phrases among the choices that exhibits the same logical relationship as the words/phrases in the following pair. heavy : weight (Points : 1)

**Informal Logic**

11{1[2(06)06]}> Reporter: A new campaign finance reform bill being considered by Congress would limit the amount of campaign contributions that political candidates can receive. However, a survey of candidates running for mayor, governor, and senate seats shows that not one...

**chemistry **

How many grams of ethylene glycol, HOCH2CH2OH, are present in 2.6 gallons of a 4.61 m solution with a density of 1.88 g/mL? i think that this is a dimensional analysis type of question. 1 gal ~ 3485.41 ml. i just need help with the set up, i think...

**A U**

<11{7[1(01)77]}> Detective: The robbery at the mall was carried out by a mall employee acting alone roughly one hour after the mall closed last Saturday night. The only employees present at the mall at the time of the robbery were security guards Evans and Clark. Since t...

**lgebra**

How do I solve this litreal equation? Solve q = 1 - p for p in terms of q.

**chemistry**

How many compounds would there be in a combinatorial library of ester compounds made from every isomer of monofluorobenzoic acid and every possible alkyl alcohol with 4 or less carbon atoms? 1. 11 2. 24 3.12 4.21 i know its either 21 or 24 but im not sure :S can someone help m...

**Algebra**

0.3x-0.2y=4,0.5x+0.5y=-15/9 solve

**social studies **

in what two regions do the appalachians lie?

**algebra**

Melissa is 31 years younger than her dad. The sum of their ages is 61. How old is Melissa? How old is her dad?

**Trigonometry**

Suppose that after you are loaded into a FerrisWheal car, the wheel beguins turning at 3 revs/min.The wheal had a diameter of 20m and the bottom of the seat of the wheel is 2m above the ground. Express the hight of the seat above the ground as a function of time (t seconds), a...

**chemistry**

is the answer supposed to be 87297?

**chemistry**

When a student plotted ln [vapor pressure of a gas] vs. inverse Kelvin temperature, she obtained a straight line with a slope equal to -1.0500 x 10^4 K. According to the Clausius Clapeyron equation, Hvap is kJ/mol. ?

**MATH**

100.231

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