# Physics!

74,760 results, page 44
1. ## Physics

Let U=(13i3−i). What is U†? Explicitly indicate multiplication with a * symbol. For instance, you should write 3*i+2 instead of 3i+2.
2. ## Physics

How much energy is stored in the 120 uf capacitor of a defibrillator if the potential across the plates is 4 x 10^3 V?
3. ## Physics

Light travels at a speed 3x10^8 m/s. What distance does it travel in a time of 0.1s?
4. ## Physics

You throw a plate off your roof with a speed of 10.0 m/s. 4.00 seconds later it hits the ground? How far?
5. ## physics

ifv=(3i+4j+5k)m/s is the instantaneous velocity of a body mass 1.50kg calculate its K.E
6. ## physics

a spring has a force constant of 20000 N/m how far must it be strectched for its potential energy to be 43 J??
7. ## physics

if an iron cube of volume 400cm3 is immersed in water,the upthrust will be?
8. ## Physics

a sled is capable of reaching speeds of 450 m/s in 1.82 s then stopped in 1.92 s what is the acceleration
9. ## Physics

Who originally designed the planetary model of an atom? Bohr or Rutherford
10. ## mathematical physics

Solve the following ODE using the power series method (1-x^2)y"-2xy'+2y = 0
11. ## physics

Find d electrostaticforce of a q1 to other charges.express ur answer as magnitude n direction
12. ## Physics

Draw areal velocity versus time graph for Mars.
13. ## Physics

Find the centripetal acceleration of a car that rounds an 80 m radius curve at 10 m/s.
14. ## physics

two objects a and b have the same size but a is heavier than b .they reach the ground at the same time but a has greater______
15. ## Physics

What hanging mass will stretch a 1.9-m-long, 0.54 - diameter steel wire by 1.2 ?
16. ## physics

What would be the orbital speed and period of a satellite in orbit 1.50 ✕ 10^8 m above the Earth?
17. ## physics

How much force does an 60 kg astronaut exert on his chair while accelerating straight up at 8m/s squared?
18. ## Chemistry and physics

What causes a red glow when the iron and sulphur mixture is heated?
19. ## Physics

Under what conditions will a 0.0300 kg marble and a 3.00 kg rock have the same gravitational potential energy other than zero
20. ## physics

Calculate the number density of strontium titanate (SrTiO3), ρ = 5.12 g cm -3
21. ## Physics

A photon a. is a quantum of light b. is a wave c. means bundle of energy(I think it's this one)
22. ## Science

Name 3 physical (physics) occurances that happen within a roller coaster ride?
23. ## physics

What is the mass of an object that requires a force of 65N to accelarate it at a rate of 13 m/s2?
24. ## physics

need the formula to find jupiters orbital period in earth years
25. ## physics

find the magnitude and dirction of the resultant force of two perpendicular forces F1=3N and F2=4N
26. ## PHYSICS

What is the force of attraction between two masses 5kg and 8kg at a distance of 60cm apart.
27. ## Physics

the relationship between linear speed and net force is inverse right? can someone explain why to me please.
28. ## physics

Two charged spheres are 18.0 cm apart. They are moved, and the force on each of them is found to have been doubled. How far apart are they now? ______cm
29. ## physics

at what temprature is the average translational k.e of a molecule in an ideal gas equal to 1 ev?
30. ## physics

A 0.355-kg object undergoing SHM has ax = 2.30 m/s2 when x = 0.235 m. What is the time for one oscillation?
31. ## Physics

You have a circular table. You measured its radius to be 10 cm with an uncertainty dr =+/- 3mm. The area would be A +/- a cm^2. a. What is A? b. What is a?
32. ## physics 102

What are the wavelengths of electromagnetic wave in free space that have the following frequencies? (a) 3.00 10^19 Hz pm (b) 7.50 10^9 Hz cm
33. ## physics

Is the charge on the surface of the earth due to an excess or a deficit of electrons?
34. ## physics

the number of waves of wavelength 6000 angstrom in a path of 2 cm in vacuum are
35. ## Physics

A 74.0 kg firefighter climbs a flight of stairs 12.0 m high. How much work is required?
36. ## 9th grade conceptual physics

How do you find the cargo capacity for a boat?
37. ## physics

a boy drops a mango from a tree it falls without rebound what happens to it's momentum
38. ## Physics Ana

http://www.jiskha.com/display.cgi?id=1258760143
39. ## principles of physics

Find the density of a 4.2- kg solid cylinder that is 13 cm tall with a radius of 5.0 cm.
40. ## physics

Find the speed of a sleigh sliding 326 feet in 22 seconds.
41. ## Physics

A car speeds up from 12 m/s to 20 m/s in 6.4s.If its mass is 1200 kg,what force must its engine provide ?
42. ## physics

What is meant by the statement that the specific latent heat of steam is 2260000jkg
43. ## Physics

an elastic band is stretched a distance of 0.150m by a force of 100.0
44. ## physics

What is the length of a box in which the difference between an electron's first and second allowed energies is 1.30×10−19 ?
45. ## Physics

You have a circular table. You measured its radius to be 10 cm with an uncertainty dr =+/- 3mm. The area would be A +/- a cm^2. a. What is A? b. What is a?
46. ## Physics

What angle should you rotate a mirror so that a reflected ray rotates through 28 degrees. I got 20, but i am not sure, please help
47. ## physics

if you walk for 46 minutes at a speed of0.91 meters per second, how far will you have traveled? convert to km
48. ## physics

lava ball is shot straight up at 28m/s what is speed after 3 seconds
49. ## physics

Calculate the speed of an electron that is accelerated through the potential difference of 123 V.
50. ## physics 11

By how much would 1200 W kettle, which is 72% efficient raise the temperature of 0.60 kg of water in 3.0 min?
51. ## physics

How much work is done in lifting a 300 Newton rock 10 meters from the ground?
52. ## Physics

A mango is dropped and falls freely from rest what are its position and velocity after 1.0s,2.0s, and 3.0s
53. ## physics

An electron travels 7.63 m in 7.33 × 10−8 s. How fast does it travel? Answer in units of cm/s
54. ## physics

What is the concentration (in g/100ml ) of a solution which has 2,8g of NaCI dissolved into 88.0ml of water?
55. ## Physics

Acoustics. How do engineers design buildings to reduce noise pollution?
56. ## Physics

What is the resistance of a 4.00 m length of copper wire having a diameter of 2.00 mm at a temperature of 20 degrees?
57. ## Physics

Under what conditions would an applied force increase the Kinetic energy of an object?
58. ## Physics

An object moves with acceleration given by a = -6t^3 m/s^2. Its initial velocity at t = 0 is 5 m/s. How far will it move before stopping?
59. ## Physics

Calculate the gravitational force between two identical 100-kg masses separated by 1 m.
60. ## Physics

i need help with a very VERY long problem. its about speed and distance. will post question when someone is interested to help! :]
61. ## Physics

An object moves with acceleration given by a = -6t^3 m/s^2. Its initial velocity at t = 0 is 5 m/s. How far will it move before stopping?
62. ## Physics

A body of mass m moves under the influence of force F(r). Given it's trayectory r(t), find F(r).
63. ## Physics

What are the components of a vector of magnitude 1.5 m at an angle of 35 degrees from the positive x-axis?
64. ## physics

A spring has a force constant of 70000 N/m. How far must it be stretched for its potential energy to be 21 J?
65. ## Physics

A body of mass m moves under the influence of force F(r). Given it's trayectory r(t), find F(r).
66. ## Physics

A mass of 100 gram is fallen down,which will be the kinetic energy after 5 second of its fall?
67. ## Physics

Have no idea how to do this! Determine the weight of a 1768.0-kg car which is moving at a speed of 26 m/s.
68. ## physics

a suitcase weighs 30 kg wt.everytime i weigh it on a spring balance,the reading is different.WHY?
69. ## Physics

A body of mass m moves under the influence of force F(r). Given it's trayectory r(t), find F(r).

71. ## Physics

A 1400-kg race car can go from 0 to 90km/h in 6.0s . What average power is required to do this?
72. ## Physics

What takes more energy to raise its temperature by one degree, water or ice? Thanks!
73. ## PHYSICS

A hypothetical planet has a mass 1.55 times that of Earth, but the same radius. What is g near its surface?
74. ## Physics

What is the wavelength of visible light emit- ted at 4.2 × 108 MHz?
75. ## physics

A trolley while going down an inclined plane has an acceleration of 2 cm/s2.What will be the velocity 3 secs after its start?
76. ## physics

Determine the net force necessary to give an object with a mass of 1.8 kg an acceleration of 5.7 m/s2.
77. ## physics

What is the wavelength of the higher frequency limit (18 megahertz) in dry air at 0 C?
78. ## physics

what will happen to the bone structure if earth becomes more dense than its actual density?
79. ## physics

What is the mass of an object that requires a force of 65N to accelerate it at a rate of 13 m/s2?
80. ## Physics

what is the power dissipated in an ac circit in which current v=230sin(wt+90) and I=10sin(wt)...plz help me
81. ## Physics 112

Two point charges, +3.18 µC and -6.40 µC, are separated by 1.32 m. What is the electric potential midway between them?
82. ## Physics/chemistry

Describe the partcle Theory of a HOt air Balloon?
83. ## physics

Can a metal sphere of radius 1cm hold a charge of 1coloumb
84. ## physics

How much time will elapse between seeing lightening and hearing the thunder happening 8000 m from you?
85. ## physics

How much time will elapse between seeing lightening and hearing the thunder happening 8000 m from you?
86. ## Physics

What is the fundamental frequency on a 5 m rope that is tied at both ends if the speed of the waves is 24 m/s?
87. ## physics

If,an,object,is,at,rest,there,must,be,no,force,acting,on,it.Is,this,statement,correct?,Explain!
88. ## Physics

How much work does a weightlifter do on a 450 N barbell thathe lifts 2m into the air
89. ## physics

I can't fully understand Fermat's principle of least time (the modern version)
90. ## physics

determine the pressure of a 20 lb force is applied to an area of 10 inch squared
91. ## physics

A storage tank of negligible mass and 30 m high is filled with gasoline
92. ## physics

At what speed should an object be projected to reach the maximum range of 200 m ?
93. ## physics

determine the pressure of a 20 lb force is applied to an area of 10 inch squared
94. ## physics

what is the displacement of the ball? i.imgur. com/8ljWh . png i don't know calculus!
95. ## physics

if a force of 3000 n can move a crate at an acceleration of 10 m/s2, what is the mass of the object
96. ## Physics

Determine the x-intercepts of the polynomial function y=-6(x+7)^4 + 5. Round to two decimal places, if necessary.
97. ## Physics

Two vectors A. and B have magnitude A = 3.00 and B = 3.00. Their vector product is A x B= -5.00k + 2.00i. What is the angle between A and B?
98. ## physics repost

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
99. ## Physics

Two vectors A and B have magnitude A = 3.00 and B = 3.00. Their vector product is A x B= -5.00k + 2.00i. What is the angle between A and B?
100. ## physics

A man weighs 750.0 N on Earth at what altitude will he weigh 187.5 N?