# Physics!

74,459 results, page 44

1. ### physics

Pls what is the specific of water? Is think is 4200 but my mates are saying it's 4180

1) A roller coaster (398 kg) moves from A (3.82 m above the ground) to B (29.4 m above the ground). Two non-conservative forces are present: friction does -1.82 x 104 J of work on the car, and a chain mechanism does +5.49 x 10^4 J of work to help the car up a long climb. What ...
3. ### Physics check

A speeder traveling at 41 m/s passes a motorcycle policeman at rest at the side of the road. The policeman accelerates at 3.3 m/s2. To the nearest tenth of a second how long does it take the policeman to catch the speeder? Im sorry I am new to physics this is my first year and...
4. ### Physics/Math

A can of sardines is made to move along an x axis from x1 = 0.2 m to x2 = 1.2 m by a force given by F = iF0exp(-0.4x), with x in meters and F0 = 4.5 N. (Here exp is the exponential function.) How much work is done on the can by the force? For Further Reading * Physics/Math - ...
5. ### physics

gravational force deimos, a satellite of amrs, has an average radius of 6.3 km. If the gravational force between deimos and a 3.0 kg rock at its surface is 2.5x10(-2)N..what is the mass of deimos ? Use the Universal Law of gravitation: Force= G Mm/distance^2 Solve for M. i did...

In a physics laboratory experiment, a coil with 170 turns enclosing an area of 10cm^2 is rotated from a position where its plane is perpendicular to the earth's magnetic field to one where its plane is parallel to the field. The rotation takes 5.0×10^2 s . The earth's ...

Distruive interference? Unless you put C in the line between A and B, this the asnwer is at infinity. Now on the line between A and B, the distance from A to C has to be an odd multiple of halfwavelength greater than C to B. Now, the distance between the speakers is two ...
8. ### PHYSICS

Long, long ago, on a planet far, far away, a physics experiment was carried out. First, a 0.250 kg ball with zero net charge was dropped from rest at a height of 1.00 m. The ball landed 0.350 s later. Next, the ball was given a net charge of 7.60 muC and dropped in the same ...

A person is riding a bicycle, and its wheels have an angular velocity of 26.0 rad/s. Then, the brakes are applied and the bike is brought to a uniform stop. During braking, the angular displacement of each wheel is 17.6 revolutions. (a) How much time does it take for the bike ...
10. ### PHYSICS

Could u help with physics hw! i keep trying but i keep getting the wrong answer? a 71g autographed baseball slides off of a 1.3 m high table and strikes the floor a horizontal distance of .83m away from the table. 1.how fast was it rolling on the table before it fell off? ok ...
11. ### physics

Hi, I am confused about physics, more specifically force. I know that the formula for force is: f=ma So what if an object traveling at constant speed (acc equals zero) collides with a wall? How would you calculate the force, since there is no acceleration? There IS force upon ...
12. ### senior courses

this is a reply to Ms.Sue's question yesterday. my college and career goals are to do with Foods. cooking, culinary arts .. but i don't think that i can chose my next year (12th grade) courses according to that, can i? those are my plans for college right now i'm having ...
13. ### Physics

An airliner is at point A and is trying to fly to point B, which is 1000 km due North of point A. The pilot of the airliner wishes to reach point B in 2.5 hr. A wind is blowing from the Northwest (45 degrees) at 100 km/hr. In what direction and at what speed must the pilot fly...
14. ### physics

Answer the following question:Be sure to show all work. Include formulae and units.Be sure to include relavant, meaningful diagram and a complete circuit diagram with circuit related problem. take enough space, don't try to squeeze everything on a small space!(problems are ...
15. ### AP Physics

Using what's only in chapter one The Nature of Science Models, Theories, and Laws Measurement and Uncertainty; Significant Figuers Units, Standards, and SI System Converting Units Order of Magnitude: Rapid Estimating Dimensions and Dimensional Analysis How am I suppose to ...
16. ### active physics

a 25 mewton force pushes against a 5 kg. mass. what is the acceleration??? what formula do i use?? F=ma
17. ### Physics II

How much work (in joules) is done in moving a charge of 2.5μC a distance of 35 cm along an equipotential at 12~V?

19. ### physics

If a car travels westward with a constant velocity of 20 m/s, what is the net external force acting on it?
20. ### Physics

2.A 4430 kg helicopter accelerates upward at 2.2 m/s2. What lift force is exerted by the air on the propellers?
21. ### Physics

2.A 4430 kg helicopter accelerates upward at 2.2 m/s2. What lift force is exerted by the air on the propellers?

HOW WOULD YOU integrate this equation between zero and pi/2 1/(1+(tan^2008)xdx
23. ### Physics

How does the idea of magnetic fields arising from circulating currents relate to permanent magnets?
24. ### Physics

How does the idea of magnetic fields arising from circulating currents relate to permanent magnets?
25. ### Physics

What is the number of the highest harmonic that could be heard by a person who is capable of hearing frequencies up to 1.00×104 Hz?
26. ### Physics

i cant get this right. what is the measured resistance of a 1000ohm, 500ohm and a 100 ohm resistor. and there % error
27. ### Physics

A 4610 kg helicopter accelerated upwards at 2 m/s^2. What lift force is exerted by the air on the propellers?
28. ### Physics

Displacement is to distance as velocity is to: a. acceleration b. mass. c. speed. d. time I chose C....is this correct?
29. ### Science-- Physics

Does an object need to have a velocity of 0 meters per second to be in equilibrium and why/why not?
30. ### Physics

How many electrons must be removed from an electrically neutral silver dollar to give it a charge of +2.8 µC?
31. ### Physics

How do the mainsail and the jib of a sailboat help the boat sail? What do these two sails have to do with force?
32. ### Physics

Aircraft with acceration of magnitude of 42.5 m/s. If starting from rest how long will it take to travel a 2.6 km runway?
33. ### Physics

Why are the armature and field windings of an electric motor usually wound on an iron core?

35. ### physics

does a ball moving at a constant speed around a circular track produce acceleration?
36. ### physics

In a red glass filter, of the colors that make up white light, which if any are reflected or absorbed?
37. ### Physics

what is the purpose of the double bell jars that surround the international prototype of the kilogram in Paris?
38. ### Physics

If you are viewing a hologram and you close one eye, will you still perceive depth? Explain.
39. ### physics

lenses that always diverge light rays that strike them is that convex or concave? I am not sure.
40. ### Physics

Explain how the photoelectric effect is used to open automatic dooes when someone approaches.
41. ### physics

Calculate the force of gravatational attraction between two spheres of mass 10.1 kg and 45.4 kg that are 38.5 m apart. F = G(m1)(m2)/r^2 = 6.67 x 10^-11(10.1)(45.4)/38.5^2 = 2.06 x 10 ^-11 N
42. ### Physics check

In 1923, Robert Millikan won the Nobel Prize for discovering the mass of the .... electron?
43. ### Physics check

The two quantities conserved in all nuclear equations are....... mass and number?
44. ### Physics

If the third harmonic of a standing wave in a vibrating string is 600 Hz, what is the fundamental frequency?
45. ### physics

Does an object need a net force acing on it in order to move at constant velocity?
46. ### Physics

A student photographs a 18cm flower so it fills half of a 24mm slide. What is the magnification?
47. ### Physics

Two identical charges are 36 mm apart. The electrostatic force between them is 1.3 N. What is the size of each charge?
48. ### college physics

the speed of light is about 3.00 x 10^8 m/s. convert this figure to miles per hour

im not procrastinating i really don't understand it. im not asking for the answers im just asking for a little more help??
50. ### physics

can anyone give me a site that "best explains" about Rotational motion/Angular. thanks a lot.. :)
51. ### Physics

can anyone give a site that have problems about pressure with solution.. urgently needed.. thanks :)
52. ### physics

What is the evidence for the claim that iron exists in a relatively cool outer layer of the sun?
53. ### physics (emergency!)

How much work is required to stop an electron (m = 9.11 10-31 kg) which is moving with a speed of 1.99 106 m/s?

What force is needed to accelerate a 10 kilogram shopping cart 3 m/s^2 (squared)?
55. ### PHYSICS

lIST THE PARTICLES THAT MAKE UP AN ATOM. wHAT ARE THEIR CHARGES? hOW ARE THEY ARANGED? wHAT IS THE APPROXIMATE AMU OF EACH PARTICLE?
56. ### Physics

List the particles that make up an atom. What are their charges? How are they arranged? wHat is the approximate amu of each particle?
57. ### physics

An object experiences an impulse, moves and attains a momentum of 200 kg m/s. If its mass is 50 kg, what is its velocity?
58. ### physics

Why can't you put your heels firmly against a wall and then bend over without falling?
59. ### Physics

What are some possible uses for gelled methanol and why was it never used as a fuel in transportation?
60. ### Physics

If 2.4 m3 of a gas initially at STP is compressed to 1.6 m3 and its temperature raised to 30oC, what is the final pressure?
61. ### physics

If an 80kg sprinter can accelerate from a standing start to a speed of 10 m/s in 3 s, what average power is generated?
62. ### Physics

What is the work required for a 1000kg truck to increase in speed from 30 m/s to 40m/s? Is the answer 350 kJ?
63. ### Physics

What Net Force is necessary to give a 2.0 kg mass initially at rest an acceleration of 5.0 m/s^2? Is the answer 10. N?
64. ### physics

how much work can a 50.0kg wreckin ball traveling at 5.00m/s do when striking a building
65. ### Physics

How does mass affect the motion of objects falling freely under the influence of gravity?
66. ### Physics

How can you easily increase the magnetic field strength inside a current carrying coil?
67. ### Physics

What is the de Brogile wavelength of an electon that strikes the back of the face of a TV screen at 1/10 the speed of light?
68. ### Physics

A cube of ice weighing 18 grams sublimes into vapor. How many liters of gas will you get?
69. ### Physics

What does shifting the phase between the sources in a double slit experiment do to the interference pattern?
70. ### Physics

An object is thrown upwards with a speed of 14.0 m/s. How long does it take to reach its maximum height
71. ### Physics

Could someone tell me the formula for finding distance when time is given and the acceleration is constant?
72. ### Physics

What is the value of a if the object is moving with constant velocity? What does this equation reduce to in such a case?
73. ### physics

The acceleration of a certain rocket is given by a=bt where b is positive cnstant, find the position function Xo and Vo at t=o?
74. ### Physics

The acceleration of a certain rocket is given by ax=bt where b is positive constant, find the position and velocity at t=5.0s if Xo=0 and Vo=0 and b=3.0m/s^3?
75. ### physics

Is it possible to calculate the torque acting on a rigid body without specifying the origin?
76. ### physics

A 1100 kg sports car accelerates from 0m/s to 33m/s in 13s What is the average power of the engine?
77. ### physics

A 4430-kg helicopter accelerates upward at 2.2 m/s2. What lift force is exerted by the air on the propellers?

79. ### physics

A 1.5 volt battery will increase the potential energy of ________________ coulombs of charge by 0.18 joules.
80. ### physics

What happens when you walk across a carpet and receive a shock when you touch a metal object.
81. ### physics

A particle at rest undergoes an acceleration of 2.1 m/s2 to the right and 5 m/s2 up. a) What is its speed after 7.9 s? Answer in units of m/s.
82. ### physics

If a car is traveling westward with a constant velocity of 20 m/s, what is the net external force acting on it?
83. ### Physics

If the change in position Dx is related to velocity v (with units of m/s) in the equation Dx = Av, the constant A has which dimension? a. m/s^2 b. m c. s d. m^2 I chose b?
84. ### physics

How can you easily increase the magnetic field strength inside a current-carrying coil?
85. ### Physics

How does the idea of magnetic fields arising from circulating currents relate to permanent magnets?
86. ### physcal science/physics

what is the kinetic energy in joules of a 1000 kg car travelling at 90km/h
87. ### Physics

What is the de Broglie wavelength of an electron that strikes the back of the face of a TV screen at 1/9 the speed of light?
88. ### Physics

Thanx DRWLS! Worked like a charm and I checked behind myself with the same formula!!!
89. ### Physics

Another one, sorry! =P This stuff is really confusing.. Why doesn't friction depend on surface area?
90. ### physics

how many electrons must be removed from an electrically neutral silver dollar to give a charge of +2.8 uc
91. ### Physics

At what temperature is the rms speed of helium molecules half its value at STP (0 C}, 1.0 atm)?
92. ### physics

if a block of wood dropped from a building has attained a velocity of 78 m/s how long has it been falling?
93. ### Physics

what is the mass of hydrogen peroixide, H2O2, in 350 grams ofa 20% by weight solution?
94. ### Physics

A mass of gas has a volume of 380 cm3 at a pressure of 560 mm Hg and a temperature of 7C. What is its bolume at s.t.p.?
95. ### physics

how much energy is gain by an electron accelerated through a potential differenc of 30000v?

what is the index of refraction of a medium in which the speed of this radiation is 2.54X10^8 m/s? I don't even know where to start...
97. ### physics

Determine the percent error in this approximate value. (There are 365.24 days in one year.)
98. ### physics

What is the number of the highest harmonic that could be heard by a person who is capable of hearing frequencies up to 1.00×104 ?
99. ### Physics

What experiment can be used to prove that the value of gravity near the earths surface is constant ie. 9,8m.s
100. ### physics

A crane lifts 1 tonne of concrete through a height of 25 m. How much work does it do? (1 kg has a weight of 9.81 N.)