# Physics!

74,730 results, page 57
1. ## physics

What is the volume of a metal which weighs 28g less in kerosene and the densty is 800 kgm3 than it does in air
2. ## Physics

what is the correct equation to use to find the velocity of the center of mass of a cylinder after it rolls down a hill
3. ## 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?
4. ## Physics

If a bullet was fired straight up at a speed of 30 m/s, what would be the total time for it to return to its starting point?
5. ## physics

what is the momentum of a free falling object that has a mass of 85 lbs. and falls for 20 seconds before it hits
6. ## Physics

Four 50-\mu {\rm{C}} charges are brought from far apart onto a line where they're spaced at 2.0-{\rm cm} intervals. How much work does it take to assemble this charge distribution?
7. ## physics

show that the acceleration is 7.5 m/s² for a ball that starts from rest and rolls down a ramp and gains a speed of 30 m/s in 4s
8. ## Physics

If a bullet was fired straight up at a speed of 30 m/s, what would be the total time for it to return to its starting point?
9. ## physics

An equipotential surface that surrounds a point charge q has a potential of 516 V and an area of 1.01 m2. Determine q
10. ## physics

What magnitude point charge creates a 13000 N/C electric field at a distance of 0.220 m?
11. ## physics

How much charge passes through a cross-sectional area of a copper wire in 0.8 s if I = 3.5 A? 1 C -Work equation?
12. ## physics

Compute the electric field about a uniformly charged plane sheet using gauss law.
13. ## Physics

An experimenter finds that no photo-electrons are emitted from tungsten unless the wavelength of light is less than 270nm.
14. ## Physics

What coefficient of friction is required to stop a hockey puck sliding at 12.8 m/s initially over a distance of 66.5 m?
15. ## physics

A ball tossed upward reaches a maximum height of 3.0m. Show that its initial speed was 7.7m/s.
16. ## physics

if a car moving 180km/h reduces to 72km, what is the percentage change in kinetic energy?
17. ## Physics

"At what point between two masses of 20kg and 15kg located 1.0m apart, will the gravitational field strength equal zero?"
18. ## physics

if a todler is moving at 15m/s and covering a distance of 1900m. how much time does it take to cover this distnace?
19. ## physics

Calculate the work done if a force of 300N Is applied at 30° to the horinzontal and body moves 20m
20. ## Physics

torque to move a block of m=200kg for 10m at an angle of 25 degree with a speed of 20m/s.
21. ## Physics

What is the direction of the displacement of a person who walks 10 km at 37 degrees south of east, then 14 km due west?
22. ## physics

a particle starts moving from rest with uniform acceleration . it travels a distance y in the next 2 sec
23. ## Physics 202

Find the period of a satellite with a circular orbit 350 above Earth's surface.
24. ## physics

An argon atom has a mass of 6.64 x 10 kg has 5.5x108 joules of kinetic energy. At What velocity is it moving?
25. ## Physics

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

How fast (in ) must a centrifuge rotate if a particle 8.00 from the axis of rotation is to experience an acceleration of 117000 's?
27. ## Physics

When you swim across a river does the time it takes to get to the other side depend on the rate of flow of the water?
28. ## physics

At what rate is a 60.0-kg boy using energy when he sprints up a flight of stairs 10.0 m high in 8.00 s? A. 75.0 W B. 48.0 W C. 735 W D. 480 W E. 4.80 kW
29. ## Physics (Waves)

Determine the intensity of light passing through a polarizer-analyzer combination with an angle of 45° between them.
30. ## physics

How long does it take a plane, traveling at a speed of 170 m/s, to fly once around a circle whose radius is 2900 m?
31. ## physics

If acoin roll at 1.5m/s and later rolls at 4.5m/s with an acceleration of 2 meters per squared second how long will it take to come to a stop, how far will it travel?
32. ## physics

A cars starts from rest and after 20 seconds its velocity becomes 108 km-1 find the acceleration of the car
33. ## Physics (Waves)

Determine the angle between a polarizer-analyzer combination that allows 33% of the incident light to pass through.
34. ## 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?
35. ## Physics

What is the formula to find magnetic field at the centre of the solenoid of hollow iron core??
36. ## Physics

How can you easily increase the magnetic field strength inside a current-carrying coil? Could someone help?
37. ## Physics

How many Joules of thermal energy must be added to 5 kg of water at 20 C to bring it to the boiling point (at 100 C)?
38. ## physics

explain why microwaves are better carriers of signals for long range transmission of radio waves?
39. ## physics

a 60kg sprinter accelerates from rest at 2.5m/s east for 4s. what force is acting and what is his final speed?
40. ## Physics

Two objects are near a bar magnet. One is about 1 cm away, while the other is 6 cm away. Compare and contrast the magnetic force that affects each object. What do they want me to do?
41. ## physics

How much heat is required to convert 3kg of ice at -5 degees C into steam at 125 degrees C?
42. ## Physics

A downward force of 5.1 N is exerted on a -7.3 mcirco C charge. What is the magnitude of the electric field at this point?
43. ## physics

calculate the friction force of an object? if weight=19600,vi=30ms-1,vf=0ms-1 and S=100m.
44. ## physics

Find the total force necessary to give a rocket of mass 25,000 slugs an acceleration of 28.0 ft/s2.
45. ## AP Physics

What is the potential energy of an electron and proton in a hydrogen atom if the distance between them is 5.3*10^-11? ANSWER k=9*10^9 Q=1.6*10^-19 q=1.6*10^19 Ue=? Ue=KQq/r Ue=-4.4*10^-18 j
46. ## physics

if a race car's velocity increases from 4 m/s to 36 m/s over a 4 s time interval, its average acceleration would be 10 m/s 2 ? IS THIS TRUE ?
47. ## physics

What force is necessary to keep a 2.00x10^3 car moving up a 15.0 degree incline at a constant velocity? (Mu=.200)
48. ## physics

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

Find the pressure exerted by a waterbed with dimensions of 2 m x 2 m which is 30 cm thick. (hint: use density of water)
50. ## physics

find the altitude change of a 10000-kg fighter which clims and in so doing, loses 100 m/s of airspeed
51. ## Physics

The position of some object moving along the x-axis is observed to be x(t)=9cos(pi*t/3+pi/4) meters. Find the frequency.
52. ## Physics

An airplane is flying at an altitude of 2,000 m with a speed of 216 m/s. What is the pressure of air outside the plane?
53. ## physics

If your boat weighs 1600 N, how much water will it displace when it’s floating motionless at the surface of a lake?
54. ## physics

suppose you apply 3 newtons of force to slide a box 2 meters in 6 seconds, how much work did you do?
55. ## Physics

A car travels in a straight line for 5.4 h at a constant speed of 79 km/h . What is its acceleration? Answer in units of m/s2.
56. ## physics

Describe how the energy from a rotating flywheel can be transferred to moving parts of a child's toy.
57. ## Physics

the teacher said something about doing the correct sig figs..im not sure if it applies to this, im so confused! 10.2* 7.5 =76.5? 27.1/5.31 =5.103578154425612?? 2.712 + 10.8= 13.512?
58. ## physics

a ball of mass m is thrown vertically upwards with Vo= 10j m/s. Study nature of motion
59. ## physics

The position of a particle moving along the x axis is given by x = (21 + 22t − 6t^2)m, where t is in s. What is the average velocity during the time interval t = 1s to t = 3s?
60. ## physics

Show that the acceleration is 7.5 m/s2 for a ball that starts from rest and rolls down a ramp and gains a speed of 30 m/s in 4 s
61. ## Physics

What is the tension in the string in (Figure 1) ? The volume of plastic ball is 95 cm3 and the density is 840 kg/m3.
62. ## Physics

A car travells 20 km due north and then on a bearing of 90 degrees for 12km. Use a scale drawing.
63. ## physics

sketch a postion time graph for a student walking east with a constant velocity how would that look
64. ## physics

"If you have an inductor that has an inductive reactance of 125 ohms, on a 60Hz frequency, what would be the inductance in henry's?"
65. ## physics

A train is travelling 20metres per second, accelerates at 0,5 cubic metres per second for 30 seconds.How far will it travel in this time?
66. ## physics

if a todler is moving at 15m/s and covering a distance of 1900m. how much time does it take to cover this distnace?
67. ## physics

how long do waves of frequency 7 hz and wavelength 5cm take to travel across a pool breadth 3.5 metres
68. ## physics

A positive and a negative charge, each with a magnitude of 1.41 x 10^-5 C, are separated by a distance of 0.44 m. Find the force on each of the particles.
69. ## Physics

An airplane lands and starts down the runway at a southwest velocity of 41 m/s. What constant acceleration allows it to come to a stop in 1.3 km?

Calculate the allowed wavelengths for the emission of a photon initially in the n=3 state in a hydrogen atom
71. ## physics

A 8.2 kg object undergoes an acceleration of 2.5 m/s2. What is the magnitude of the resultant force acting on it? Answer in units of N
72. ## physics

Mechanical energy is the difference between the kinetic and potential energies of an object. true or false?
73. ## Physics

An object that starts from rest completes 7 revs in 3 seconds. What is angular accel. in rad/s2?
74. ## physics

what is the kinetic energy of a 3 kg 20 cm diameter bowling ball with a linear velocity of 4m/s? (rolling and spinning)
75. ## physics

A stone of mass m kg is held h metres above the floor 50s.The workdone in joules over this period is
76. ## Physics

how fast would you have to be traveling at in a spaceship in order to appear to age 20% slower than your classmate left behind on earth
77. ## Physics

If the Kitty Hawk Flyer has 12 HP how would you express this power in the SI system and report the numerical value in kilowatts?
78. ## physics

what is meant by the change go temperature of 1 degree celcius on the scale of a plantinum resistance thermometer
79. ## Physics, Help!! URGENT!!!

A sprinter must average 24.0 mi/h to win a 100-m dash in 9.30 s. What is his wavelength at this speed if his mass is 84.5 kg?
80. ## Physics

a truck is traveling in a straight line goes 60km in 83minutes. what is its average speed in km per hour?
81. ## physics

A ball is thrown off a 30 m high cliff at 2 m/s, 50 degrees above the horizontal. How long does it take to hit the ground?
82. ## Another physics question...

Deduce the electric field strenght at a point midway between charges of 7.2*10^-6 C and -3.4*10^-6 C that are 2.0m apart from air. Thank you!
83. ## physics

What is the frequency of the EM wave emitted most strongly by a glowing element on a stove with temperature 1,500 K
84. ## Physics

How much work is required to bring a 1000 kg racing car traveling at a speed of 60 km/hr to rest?
85. ## Physics

Forces of 9.5 N and 5.12 N act at right angles on a reddish-green block of mass 3.19 kg. How much acceleration occurs?
86. ## physics

Two equal point charges of +3.00 * 10^ -6 C are placed 0.200 m apart. What are the magnitude and direction of the force each charge exerts on the other?
87. ## Physics

Describe the acceleration time graph of a car traveling forward and applying its brakes.
88. ## math in physics

find the force if f between charges of 100mc -50mc located 50cm a part?
89. ## physics

How will the weight of a 20kg object change if it was in a lift that accelerates downward at 4 meters per second squared?
90. ## physics

A body is executing s.h.m. of amplitude 1m .Its velocity while passing through the mean position is 10m/s.Find its frequency.
91. ## physics

A boy sledding down a hill accelerates at 1.20 m/s2. If he started from rest, in what distance would he reach a speed of 6.10 m/s?
92. ## Physics

find the altitude change of a 10,000 kg fighter which climbs and in doing so loses 100 m/s of airspeed
93. ## Physics

What coefficient of friction is required to stop a hockey puck sliding at 12.8 m/s initially over a distance of 66.5 m?
94. ## Physics

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

the speed of a train increases from 15 mi/h in a distance of 500 ft. calculate the average acceleration in ft/s squared
96. ## Physics

At its peak, a tornado is 60.0 m in diameter and carries 500 km/h winds. What is its angular velocity in revolutions per second?
97. ## Physics

a boy whose weight is 600 N runs up a flight of stairs 10 m high in 12 second .What is his average power?
98. ## physics

What is the magnification of a 4 cm tall object placed 40 cm from a concave mirror having a focal length of 10 cm? Choose one answer. a. 0.33 b. -0.33 c. 1.33 d. -1.33
99. ## Physics

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

You throw a ball upward from a window at a speed of 2.9 m/s. How fast will it be moving when it hits the sidewalk 2.2 m below?