Questions and answers by

ashley --- HELP PLEASEE!!!

Questions (88)

Find dy/dx given x^2+ y^2= 2xy. Im not sure how to find dy/dx
1. 1 answer
2. 406 views
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
1. 3 answers
2. 915 views
A machine lengthens a metal cylinder by rolling it under pressure. The radius of the cylinder decreases at a constant rate of
1. 4 answers
2. 1,054 views
How are glial cells connected to nanotechnology?
1. 1 answer
2. 353 views
How are glial cells connected to stem cells?
1. 2 answers
2. 1,011 views
How does glial cells affect parkinson's disease? How does glial cells affect neurotransmitters ?
1. 2 answers
2. 510 views
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
1. 1 answer
2. 743 views
Consider a situation where immediately after birth, twins are separated. One continues to live on earth, while the other is
1. 2 answers
2. 757 views
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
1. 4 answers
2. 4,404 views
expressions for the force experienced by the charge when it enters the magnetic field at an angle?
1. 1 answer
2. 414 views
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
1. 3 answers
2. 1,015 views
Which of the following is correct for the charge in a magnetic field?Choose one answer. a. A stationery charge can experience a
1. 2 answers
2. 1,028 views
A current-carrying conductor experiences a force upward in a magnetic field that acts perpendicularly to and out of the plane of
1. 4 answers
2. 1,670 views
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
1. 3 answers
2. 1,157 views
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
1. 3 answers
2. 954 views
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
1. 2 answers
2. 1,144 views
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
1. 3 answers
2. 1,592 views
What is the resistance of the coil A at 600 kelvin if its resistance at 300 kelvin is 50 ohms? (Assume the temperature
1. 2 answers
2. 791 views
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
1. 2 answers
2. 844 views
Can the charges of a material be different on a different point of a material
1. 1 answer
2. 315 views
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
1. 4 answers
2. 1,393 views
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
1. 2 answers
2. 565 views
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
1. 4 answers
2. 1,904 views
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
1. 2 answers
2. 611 views
A capacitor has a capacitance of 3 pF. What potential difference would be required to store a charge of 21 pC?Choose one answer.
1. 2 answers
2. 612 views
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
1. 3 answers
2. 926 views
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
1. 1 answer
2. 712 views
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
1. 3 answers
2. 1,087 views
The capacitance of a capacitor is 10 μF. The distance between the plates is made half and area is doubled. The capacitance of
1. 3 answers
2. 739 views
How are electric potential and electric field strength related?
1. 1 answer
2. 518 views
How will changing charge change the equipotential at a distance of 2 meters?
1. 1 answer
2. 962 views
How will changing the charge change the electric field strength at a distance?
1. 1 answer
2. 351 views
How will changing the distance change the electric field strength for a given charge?
1. 1 answer
2. 381 views
A hollow metal ball carrying an electric charge produces no electric field at a point:is it inside the ball?
1. 2 answers
2. 678 views
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
1. 3 answers
2. 920 views
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
1. 2 answers
2. 1,158 views
Two electrostatic point charges of +30 μC and +25 μC exert a repulsive force of 200 N on each other. What is the distance
1. 4 answers
2. 1,150 views
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
1. 6 answers
2. 3,386 views
is a wall a conductor?
1. 11 answers
2. 5,392 views
is a wall a conductor or insulator ?
1. 2 answers
2. 962 views
Under what conditions can a balloon become charged and not charged?
1. 1 answer
2. 426 views
A 15.0-kilogram mass is moving at 7.50 meters per second on a horizontal, frictionless surface. What is thetotal work that must
1. 4 answers
2. 6,560 views
A child, starting from rest at the top of aplayground slide, reaches a speed of 7.0 meters per second at the bottom of the
1. 4 answers
2. 7,204 views
A small electric motor is used to lift a0.50-kilogram mass at constant speed. If the mass is lifted a vertical distance of 1.5
1. 4 answers
2. 4,688 views
What total mass must be converted into energyto produce a gamma photon with an energy of 1.03 × 10^–13 joule
1. 4 answers
2. 2,730 views
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
1. 10 answers
2. 16,366 views
How will the current in a wire change as the wavelength of light changes?I have no idea how to do this.
1. 1 answer
2. 924 views
Will the photoelectric effect change for different targets
1. 1 answer
2. 355 views
Will the photoelectric effect change for different targets
1. 1 answer
2. 401 views
How will the current in a wire change as the wavelength of light changes?I have no idea how to do this.
1. 1 answer
2. 326 views
A point source of light produces photoelectrons from a photo cell with certain velocity. Which of the following is correct for
1. 1 answer
2. 480 views
Which of the following summarizes Rutherford's model of the atom?Choose one answer. a. Electrons are embedded in a positive
1. 2 answers
2. 764 views
Which of the following is correct when the intensity of the light source is increased?Choose one answer. a. The number of
1. 2 answers
2. 639 views
A metallic surface emits photo electrons when green light falls on it. But the metal does not emit when yellow light falls on
1. 2 answers
2. 587 views
Marks: 1In which of the following cases is the wavelength of the emitted radiation greatest? Choose one answer. a. Electron
1. 1 answer
2. 485 views
Marks: 3If the velocity of the particle is reduced by a factor of two, by what factor does the de Broglie wavelength change?
1. 1 answer
2. 393 views
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
1. 2 answers
2. 928 views
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
1. 2 answers
2. 775 views
Which of the following is correct according to Rutherford's atom model?Choose one answer. a. Atomic spectra should be line
1. 1 answer
2. 740 views
A metal emits photoelectrons when yellow light is made to fall on it. Which of the following is correct when the metal is
1. 1 answer
2. 521 views
Which of the following is true for the transition of electrons from a higher energy to a lower energy state?Choose one answer.
1. 2 answers
2. 1,106 views
A point source of light produces photoelectrons from a photo cell with certain velocity. Which of the following is correct for
1. 2 answers
2. 636 views
Which of the following is correct for the energy levels in an atomic system?Choose one answer. a. The energy value increases
1. 1 answer
2. 488 views
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
1. 3 answers
2. 418 views
Which of the following statements is true about a mass, which is attached to a spring and moves with simple harmonic motion on a
1. 4 answers
2. 674 views
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
1. 2 answers
2. 563 views
To the nearest order of magnitude, how many times greater than the speed of sound is the speed of light?104 106 1010 1012
1. 3 answers
2. 1,202 views
Monochromatic light passes through two parallel narrow slits and forms an interference pattern on a screen. As the distance
1. 5 answers
2. 3,252 views
if friction is set to zero and on planet Earth. Now, if you attach a mass to the spring from its initial equilibrium position,
1. 3 answers
2. 529 views
3sin(2x)-2cos(x)=0
1. 2 answers
2. 1,353 views
4cos(2x)+2cos(x)+3=0
1. 2 answers
2. 500 views
How does rarefraction affects the frequency of waves ?
1. 4 answers
2. 546 views
how does the doppler effect relate to destructive interference?
1. 1 answer
2. 486 views
how does a cardboard boat float?
1. 1 answer
2. 409 views
if you the cosine of a angle can you determine the measure of the angle
1. 1 answer
2. 325 views
Is it possible that waves can be turned into a sourse for energy and/or power ?
1. 3 answers
2. 1,011 views
The Ku Klux Klan of the postwar period differed from its original Reconstruction-era incarnation in all of the following ways
1. 7 answers
2. 959 views
One unintended consequence of the immigration restrictions passed in the 1920s was to:A. end legal immigration from east Asia.
1. 4 answers
2. 681 views
The most prominent advocate of "Negro nationalism" during the early twentieth century wwasA. Claude McKay B. Alice Paul C. Zora
1. 4 answers
2. 995 views
Which of the following strategies did the NAACP employ to secure civil rights forA. Urging African Americans to vote for
1. 4 answers
2. 712 views
Temperance groups in the 1910s focused on:A. boycotts of saloons and companies that sold or transported alcohol. B. convincing
1. 4 answers
2. 440 views
what did it mean to be modern in the 1920's?
1. 3 answers
2. 363 views
why is yellow journalism important in the Spanish American war?
1. 3 answers
2. 842 views
why does a projectile of 45 degrees have the greatest range?
1. 4 answers
2. 1,536 views
What is the units for impact?
1. 3 answers
2. 479 views
Which of the following statements about the U.S. annexation of Hawaii is true?A. It was universally popular in the United
1. 2 answers
2. 980 views
how does the third amendment affect eminent domain
1. 1 answer
2. 463 views
if you attach a mass to the spring from its initial equilibrium position, it vibrates forever in simple harmonic motion. Why
1. 3 answers
2. 1,409 views

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