Most popular questions and responses by ashley --- HELP PLEASEE!!!
1. 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?

2. 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?

3. 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.]

4. 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

5. 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)

6. physics

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

7. 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

8. 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 A

9. is a wall a conductor?

is a wall a conductor?

10. 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

11. 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

12. 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

13. 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?

14. 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?

15. 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

16. 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

17. 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

18. 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

19. HiSTORY ....helpppppp

why is yellow journalism important in the Spanish American war?

20. 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

21. 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

22. 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.

23. 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?

24. 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.

25. physics

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 of the mass, when the spring's restoring

26. 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??

27. 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

28. 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

29. 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

30. 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)

31. 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

32. 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

33. 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.

34. 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

35. physics

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

36. 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

37. physics

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

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

39. 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

40. physics -- projectile motion

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

41. 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?

42. physics

Will the photoelectric effect change for different targets

43. 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.

44. 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

45. 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?

46. physics ---- really dnt get this at all

Will the photoelectric effect change for different targets

47. 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

48. HiSTORY ....helpppppp

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

49. Eminent Domain

how does the third amendment affect eminent domain

50. calc

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

51. Psychology

How are glial cells connected to stem cells?

52. 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.

53. 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

54. 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

55. 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

56. physics

how does the doppler effect relate to destructive interference?

57. 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.

58. 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

59. physics

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

60. 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

61. 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

62. 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

63. 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

64. 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

65. 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

66. trig

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

67. trig

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

68. math

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

69. science

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

70. 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

71. physics

What is the units for impact?

72. 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?

73. Psychology

How are glial cells connected to nanotechnology?

74. Psychology

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

75. physics

How are electric potential and electric field strength related?

76. physics

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

77. science

is a wall a conductor or insulator ?

78. physics

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

79. physics

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

80. physics

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

81. 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

82. 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

83. 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

84. physics

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

85. physics

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

86. physics -- waves

How does rarefraction affects the frequency of waves ?

87. physics

how does a cardboard boat float?

88. 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

1. calc

thanks that helps alot

posted on December 27, 2011

is it towards the proton?

posted on May 14, 2011
3. physics

so its 40?

posted on May 14, 2011
4. 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

posted on May 10, 2011
5. physics ---- really dnt get this at all

thank u so much it makes sense

posted on April 10, 2011
6. HiSTORY ....helpppppp

thanks. +)

posted on March 22, 2011
7. HiSTORY ....helpppppp

ok. so then a

posted on March 22, 2011
8. HiSTORY ....helpppppp

I THINK ITS C

posted on March 22, 2011
9. HiSTORY ....helpppppp

e . MARCUS GARVEY

posted on March 22, 2011
10. HiSTORY ....helpppppp

i think its C

posted on March 22, 2011
11. HiSTORY ....helpppppp

i think B

posted on March 21, 2011
12. physics

thank u

posted on March 5, 2011