Thursday
July 31, 2014

Posts by ashley --- HELP PLEASEE!!!


Total # Posts: 101

calc
Find dy/dx given x^2+ y^2= 2xy. Im not sure how to find dy/dx

calc
An object moves along a parabolic path defined by the equation y = 2x 2 + 1 in such a way that the y-value is decreasing at a constant rate of 2 units per second. At what rate is the x-coordinate changing when x = 3/2?

calc
thanks that helps alot

calc
A machine lengthens a metal cylinder by rolling it under pressure. The radius of the cylinder decreases at a constant rate of 0.05 inches per second while the volume stays constant at 128π cubic inches. At what rate is the length L changing when the radius r is 1.8 inches...

Psychology
How are glial cells connected to nanotechnology?

Psychology
How are glial cells connected to stem cells?

Psychology
How does glial cells affect parkinson's disease? How does glial cells affect neurotransmitters ?

physics
A square coil of side 0.5 m is placed with its plane perpendicular to the direction of the magnetic field. What is the flux change in the coil if the magnetic field changes from 0.1 Tesla to 0.5 Tesla? Choose one answer. a. 0.1 Weber b. 0.2 Weber c. 0.8 Weber d. 1.6 Weber the ...

physics
Consider a situation where immediately after birth, twins are separated. One continues to live on earth, while the other is whisked away in a space ship at 90% of the speed of light. After 65 years they are reunited. Will they look the same? I know that the twin that was whisk...

physics
In a lightning strike, a charge of 18 coulombs is transferred between a cloud and the ground in 2.0 × 10-2 second at a potential difference of 1.5 × 106 volts. What is the average current produced by this strike? 3.6 × 10-1 A 9.0 × 102 A 3.0 × 104...

physics
expressions for the force experienced by the charge when it enters the magnetic field at an angle?

physics
A circular loop of area 0.8 m2 is inclined at an angle 60° in a uniform magnetic field of 0.4 Tesla. What is the magnetic flux associated with the loop? Choose one answer. a. 0.32 Weber b. 0.16 Weber c. 0.28 Weber d. 0.14 Weber

physics
Which of the following is correct for the charge in a magnetic field? Choose one answer. a. A stationery charge can experience a force in a magnetic field. b. A moving charge parallel to the direction of the magnetic field can experience a force. c. A moving charge perpendicul...

physics
A current-carrying conductor experiences a force upward in a magnetic field that acts perpendicularly to and out of the plane of the paper. What is direction of the current in the conductor? Choose one answer. a. The current in the conductor is toward right. b. The current in ...

physics
A moving proton with a speed of 0.3 m/s experiences a force of 1.5*10^-20N, when it enters at a right angle to the direction of the magnetic field. What is the magnitude of the magnetic field? Choose one answer. a. 0.3 Tesla b. 0.5 Tesla c. 0.9 Tesla d. 1.3 Tesla

physics
A conductor of length 0.8 m carrying a current of 2.5 A is kept in a magnetic field of 0.6 Tesla. What is the magnitude of the force experienced by the conductor if it is inclined at an angle 30° to the direction of the magnetic field? Choose one answer. a. 0.6 N b. 1.0 N ...

physics ---- really dnt get this at all
A total charge of 25 mC passes through a cross-sectional area of a nichrome wire in 10 s. How many electrons pass through the cross-sectional area in 16 s? Choose one answer. a. 2.5 x 1017 electrons b. 2.5 x 1019 electrons c. 2.5 x 1016 electrons d. 2.5 x 1021 electrons

physics
A total charge of 25 mC passes through a cross-sectional area of a nichrome wire in 10 s. What is the current in the wire? Choose one answer. a. 2.5 A b. 2.5 mA c. 25 mA d. 2.5 µA

physics
What is the resistance of the coil A at 600 kelvin if its resistance at 300 kelvin is 50 ohms? (Assume the temperature coefficient of resistance of the coil is .007/ degrees C)

physics
A wire of length L m has 2 ohms resistance. It is stretched twice its original length and its area becomes half of its original area. What is its new resistance?

physics
Can the charges of a material be different on a different point of a material

physics
Three resistors, each of resistance 6 Ω, are connected in such a way that that they form the three sides of a triangle. What is the equivalent resistance between any two vertices of the triangle?

physics
Three resistors, each of resistance 6 Ω, are connected in such a way that that they form the three sides of a triangle. What is the equivalent resistance between any two vertices of the triangle?

physics
Several light bulbs, each of resistance 1.5 Ω, are connected in a series across a 120 V source of emf. If the current through the circuit is 2 A, how many light bulbs are there in the circuit?

physics . really need help
An electric iron of 500 W power is used daily for 30 minutes. If the cost per kW.h is $0.10, what is the weekly expense in using the electric iron??

physics
A capacitor has a capacitance of 3 pF. What potential difference would be required to store a charge of 21 pC? Choose one answer. a. 3 V b. 21 V c. 7 V d. 0.14 V

pleaseeeee help - physics
is it towards the proton?

pleaseeeee help - physics
Four charges are placed at the four corners of a square of side 15 cm. The charges on the upper left and right corners are +3 μC and -6 μC respectively. The charges on the lower left and right corners are -2.4 μC and -9 μC respectively. The net electric for...

physics
Four charges are placed at the four corners of a square of side 15 cm. The charges on the upper left and right corners are +3 μC and -6 μC respectively. The charges on the lower left and right corners are -2.4 μC and -9 μC respectively. The net electric for...

physics
A proton and an electron in a hydrogen atom are separated by a distance of 5.3 x 10-11 m. The magnitude and direction of electric field set up by the proton at the position of the electron is: a. 5.1 x1011 N/C away from the proton b. 5.1 x1011 N/C toward the proton c. 5.1 x101...

physics
so its 40?

physics
The capacitance of a capacitor is 10 μF. The distance between the plates is made half and area is doubled. The capacitance of the capacitor will now be: i think its 20 im not sure tho

physics
How are electric potential and electric field strength related?

physics
How will changing charge change the equipotential at a distance of 2 meters?

physics
How will changing the charge change the electric field strength at a distance?

physics
How will changing the distance change the electric field strength for a given charge?

physics
A hollow metal ball carrying an electric charge produces no electric field at a point: is it inside the ball?

physics
Four charges are placed at the four corners of a square of side 15 cm. The charges on the upper left and right corners are +3 µC and -6 µC respectively. The charges on the lower left and right corners are -2.4 µC and -9 µC respectively. The net electric...

physics
Two point charges +4q and +q are placed 30 cm apart. At what point on the line joining them is the electric field zero? (a) 15 cm from charge 4q (b) 20 cm from charge 4q (c) 7.5 cm from charge q (d) 5 cm from charge q

physics
Two electrostatic point charges of +30 μC and +25 μC exert a repulsive force of 200 N on each other. What is the distance between the two charges?

physics
Two point charges +4q and +q are placed 30 cm apart. At what point on the line joining them is the electric field zero? (a) 15 cm from charge 4q (b) 20 cm from charge 4q (c) 7.5 cm from charge q (d) 5 cm from charge q

is a wall a conductor?
Well it was a lab and the balloon was a insulator with a negative charge it was attracted to the wall so does that mean the wall is a insulator or conductor

is a wall a conductor?
is a wall a conductor?

science
is a wall a conductor or insulator ?

physics
Under what conditions can a balloon become charged and not charged?

physics
A 15.0-kilogram mass is moving at 7.50 meters per second on a horizontal, frictionless surface. What is the total work that must be done on the mass to increase its speed to 11.5 meters per second?

physics
A child, starting from rest at the top of a playground slide, reaches a speed of 7.0 meters per second at the bottom of the slide. What is the vertical height of the slide? [Neglect friction.]

physics ---- really dnt get this at all
A small electric motor is used to lift a 0.50-kilogram mass at constant speed. If the mass is lifted a vertical distance of 1.5 meters in 5.0 seconds, the average power developed by the motor is

physics
What total mass must be converted into energy to produce a gamma photon with an energy of 1.03 × 10^–13 joule

physics
A 3.1-kilogram gun initially at rest is free to move. When a 0.015-kilogram bullet leaves the gun with a speed of 500. meters per second, what is the speed of the gun?

physics
How will the current in a wire change as the wavelength of light changes? I have no idea how to do this.

physics
Will the photoelectric effect change for different targets

physics ---- really dnt get this at all
Will the photoelectric effect change for different targets

physics
How will the current in a wire change as the wavelength of light changes? I have no idea how to do this.

physics
A point source of light produces photoelectrons from a photo cell with certain velocity. Which of the following is correct for the photoelectrons if the distance between the photo cell and the source of light is increased? Choose one answer. a. Velocity will increase. b. Veloc...

physics
Which of the following summarizes Rutherford's model of the atom? Choose one answer. a. Electrons are embedded in a positive region of spherical dimension. b. Electrons revolve around the nucleus without emitting radiation. c. Electrons revolve around the nucleus like plan...

physics
Which of the following is correct when the intensity of the light source is increased? Choose one answer. a. The number of photons emitted by the light source in unit time increases. b. The total energy of the photons emitted per unit time decreases. c. Photons are emitted wit...

physics
A metallic surface emits photo electrons when green light falls on it. But the metal does not emit when yellow light falls on it. Which of the following is correct when red light falls on the metallic surface? Choose one answer. a. The number of photoelectrons will be more. b....

physics
Marks: 1 In which of the following cases is the wavelength of the emitted radiation greatest? Choose one answer. a. Electron jumps from third orbit to second orbit. b. Electron jumps from third orbit to first orbit. c. Electron jumps from fourth orbit to first orbit. d. Elect...

physics ---- really dnt get this at all
Marks: 3 If the velocity of the particle is reduced by a factor of two, by what factor does the de Broglie wavelength change? Choose one answer. a. 2 b. 4 c. 1/2 d.1/4

physics
A train is moving with a speed of 50 miles per hour. A man standing in the rear of a train car throws a ball toward the front of the train with a speed of 10 miles per hour. If a stationary observer outside the train sees this happen, what speed is the ball moving with? Explai...

physics
The period of a simple pendulum is measured to be 4.0 seconds in a frame of reference. Which of the following is correct when the period of the pendulum is measured by an observer moving with half the speed of the light? Choose one answer. a. The time period of the pendulum re...

physics
Which of the following is correct according to Rutherford's atom model? Choose one answer. a. Atomic spectra should be line spectra. b. Electrons do not radiate while revolving in an orbit. c. Atomic spectra should be continuous spectra. d. Electrons are embedded in a posi...

physics
A metal emits photoelectrons when yellow light is made to fall on it. Which of the following is correct when the metal is irradiated by a violet light? Choose one answer. a. The speed of electrons would increase. b. The speed of electrons would decrease. c. The number of elec...

physics
Which of the following is true for the transition of electrons from a higher energy to a lower energy state? Choose one answer. a. The greater the energy difference between the levels, the more is the wavelength of the photons emitted. b. The greater the energy difference betw...

physics
A point source of light produces photoelectrons from a photo cell with certain velocity. Which of the following is correct for the photoelectrons if the distance between the photo cell and the source of light is increased? Choose one answer. a. Velocity will increase. b. Veloc...

physics
Which of the following is correct for the energy levels in an atomic system? Choose one answer. a. The energy value increases with the distance from the nucleus. b. The energy value decreases with the distance from the nucleus. c. The energy value remains the same for all the ...

physics
A 5.00 cm tall candle is placed at a distance of 50.0 cm from a double convex lens having a focal length of 15.0 cm. What is the image distance? Choose one answer. a. -21.4 cm b. 21.4 cm c. 65 cm d. 35 cm

physics
Which of the following statements is true about a mass, which is attached to a spring and moves with simple harmonic motion on a frictionless horizontal surface? Choose one answer. a. The kinetic energy of the mass is maximum at the end positions. b. The kinetic energy of the ...

physics
What are the first, second, and third frequencies audible from a 20 cm long organ pipe when (A) only one end is open and when (B) both ends are open. The speed of sound through the air inside the organ pipe is 343m/s.

physics
To the nearest order of magnitude, how many times greater than the speed of sound is the speed of light? 104 106 1010 1012

physics
Monochromatic light passes through two parallel narrow slits and forms an interference pattern on a screen. As the distance between the two slits is increased, the distance between light bands in the pattern on the screen will 1) decrease 2) increase 3) remain the same

physics ---- really dnt get this at all
thank u so much it makes sense

physics ---- really dnt get this at all
if friction is set to zero and on planet Earth. Now, if you attach a mass to the spring from its initial equilibrium position, it vibrates forever in simple harmonic motion. Why doesn't it come to rest after stretching by a distance 'd'; proportional to the weight ...

trig
3sin(2x)-2cos(x)=0

trig
4cos(2x)+2cos(x)+3=0

physics -- waves
How does rarefraction affects the frequency of waves ?

physics
how does the doppler effect relate to destructive interference?

physics
how does a cardboard boat float?

math
if you the cosine of a angle can you determine the measure of the angle

science
Is it possible that waves can be turned into a sourse for energy and/or power ?

HiSTORY ....helpppppp
thanks. +)

HiSTORY ....helpppppp
ok. so then a

HiSTORY ....helpppppp
d

HiSTORY ....helpppppp
The Ku Klux Klan of the postwar period differed from its original Reconstruction-era incarnation in all of the following ways except: A. it had a broad base of support outside the South. B. it tried to influence politics. C. it achieved most of its goals. D. it was strongly na...

HiSTORY ....helpppppp
I THINK ITS C

HiSTORY ....helpppppp
One unintended consequence of the immigration restrictions passed in the 1920s was to: A. end legal immigration from east Asia. B. decrease the number of immigrants from southern and eastern Europe. C. increase the number and proportion of immigrants from Mexico and Latin Amer...

HiSTORY ....helpppppp
e . MARCUS GARVEY

HiSTORY ....helpppppp
The most prominent advocate of "Negro nationalism" during the early twentieth century wwas A. Claude McKay B. Alice Paul C. Zora Neale Hurston D. W.E.B. Du Bois E. Marcus Garveyas

HiSTORY ....helpppppp
i think its C

HiSTORY ....helpppppp
Which of the following strategies did the NAACP employ to secure civil rights for A. Urging African Americans to vote for Democrats in return for support of civil rights legislation in Congressfrican Americans in the 1920s? B. Efforts to gain entrance to labor unions for Afric...

HiSTORY ....helpppppp
i think B

HiSTORY ....helpppppp
Temperance groups in the 1910s focused on: A. boycotts of saloons and companies that sold or transported alcohol. B. convincing individuals of the evils of alcohol. C. passing local laws outlawing the sale and production of liquor. D. fighting organized crime's control of ...

HiSTORY ....helpppppp
what did it mean to be modern in the 1920's?

HiSTORY ....helpppppp
why is yellow journalism important in the Spanish American war?

physics -- projectile motion
why does a projectile of 45 degrees have the greatest range?

physics
thank u

physics
What is the units for impact?

HiSTORY ....helpppppp
Which of the following statements about the U.S. annexation of Hawaii is true? A. It was universally popular in the United States. B. The U.S. went to war with European powers to obtain the islands. C. It made both military and economic expansion in the Pacific easier. D. It c...

Eminent Domain
how does the third amendment affect eminent domain

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