74,641 results, page 84

1. ### Physics

Two positive charges one 2uc and the other 7uc are separated by a distance of 20cm, what is the magnitude of the electrostatic force that each charge exerts upon the other
2. ### physics

An ox exerts a force of 7100N to the horizontal direction without slipping. If the ox has a weight of 8000N, what is the minimum coefficient of static friction?
3. ### Physics

A man (80kg) jumps from a 17 storey balcony (51 metres). How long would it take for him reach the ground? ~Sorry for the morbid example, we were just having a chat about it lol
4. ### physics

What will be the equilibrium temperature when a 273 g block of copper at 298°C is placed in a 132 g aluminum calorimeter cup containing 815 g of water at 11.4°C?
5. ### Physics

A motorcycle with a mass of 350 kg is accelerated from rest to a velocity of 30 m/s by a force of 4000 N. calculate the distance over which this acceleration occurred.
6. ### physics

A 3kg basketball is dropped from the top of a 120m building. if all of the energy is converted into KE, what is the velocity of the ball just before it hits the ground
7. ### Physics

an airplane is flying in a horizontal of radius 1.0 km what must be the speed of the plane if the pilot is to experience a centripetal acceleration three times that of gravity.
8. ### physics

An aeroplane taking off from a field has a run of 500 meters. What is the acceleration and take off velocity if it leaves the ground 10 seconds after the start ?
9. ### Physics

What is the magnitude of the electric field at a point midway between a −8.3μC and a +5.4μC charge 10cm apart? Assume no other charges are nearby.
10. ### Physics

A plane travels with a uniform velocity of 3.399x10^1 m/s for a period of 2.267x10^0 seconds. What distance is travelled during this time, in meters
11. ### physics

How much force does an 71 {\rm kg} astronaut exert on his chair while sitting at rest on the launch pad? Express your answer using two significant figures.
12. ### physics

A golf ball is hit with an initial velocity of 50 m/s at an angle of 45 degrees with the horizontal. How far will it travel horizontally before it hits the ground?
13. ### Physics

Two positive charges one 2uc and the other 7uc are separated by a distance of 20cm, what is the magnitude of the electrostatic force that each charge exerts upon the other
14. ### Physics

A football is kicked at 45 degrees and travels 82 meters before hitting the ground. A) What was its initial velocity? B) How long was it in the air? C) How high did it go?
15. ### physics

A 68.0 kg crate rests on a level floor at a shipping dock. The coefficients of static and kinetic friction are 0.770 and 0.470, respectively.
16. ### Physics!

How many joules of potential energy does a 1.2-kg book gain when it is elevated 4.0 ? Express your answer to two significant figures and include the appropriate units.
17. ### physics

True or false. Electric energy is transferred from generating stations to consumers' premises at extremely low voltage?
18. ### Physics

A compact disc spins at 2.7 revolutions per second. An ant is walking on the CD and finds that it just begins to slide off the CD when it reaches a point 2.8 cm from the CD's center.
19. ### physics

How will changing charge change the equipotential at a distance of 2 meters? I honestly just don't even know where to start with this. If someone could at least point me in the right direction, that would be great!
20. ### physics

A bus starts frm rest and moves with a uniform acceleration of (1m/secondsquare) for 5 minutes. calculate the velocity and distance??
21. ### physics

The steel I-beam in the drawing has a weight of 1.53 × 103 N and is being lifted at a constant velocity. What is the tension in each cable attached to its ends?
22. ### Physics

A man was lost in the woods. He wanders 3 km north, then 7 km east, then 7 km south, then 4 km west. What is the magnitude and direction of his resultant displacement?
23. ### Physics

A ball is thrown at 21m/s at 30degree above the horizontal from the top of a roof 16m high.calculate the time of flight
24. ### physics

As a projectile shot at an upward angle rises and falls what happens to its horizontal component of its velocity if we neglect air resistance?
25. ### physics

Two 72.0 kg hockey players skating at 5.25 m/s collide and stick together. If the angle between their initial directions was 125 degrees, what is their speed after the collision?
26. ### Physics

What is the length of a simple pendulum that marks seconds by completing a full swing from left to right and then back again every 2.0s? explain plz
27. ### Physics

Calculate the specific heat of a metallic element if 314 joules of energy are needed to raise a 50.0 g sample from 25 to 50 degress C ? :)
28. ### physics

pipe to know how the inner diameter changes. Rank in order from largest to smallest the gas speeds va, vb, and vc at points a, b, and c. Explain in complete sentences.
29. ### physics

Use the fact that the speed of light in a vacuum is about 3.00 108 m/s to determine how many kilometers a pulse from a laser beam travels in exactly 4.9 hour(s)
30. ### physics

A 600 kg car is moving on a level road at 30 m/s. How large of a braking force is needed to stop it in a distance of 75m?
31. ### Physics

A ball is thrown with a speed of 100m/s attains a height of 150m.Calculate <a>the time of flight the angle of projection
32. ### physics

If a burning log is a black object with a surface area of 0.35 m2 and a temperature of 800 ¢ªC, how much power does it emit as thermal radiation?
33. ### Physics

An Object moves along x-axis such that its position varies with time according to the relation x=50t-5t^2.Here x is in meters and t in seconds.Average Speed between t=0 to t=6s.
34. ### physics

The graphs below show position as a function of time for three different objects. Describe the similarities and differences of these motions. Explain your answer.
35. ### physics 1

a helicopter is flying at an altitude of 1000 m above the ground, with a horizontal velocity of 50 m/s, how far from the rally point should the relief package be dropped?
36. ### Physics

A basketball player throws a ball at an angle of 30º above the horizontal. At what point does the magnitude of the acceleration reach a minimum?
37. ### physics

Two 72.0-kg hockey players skating at 7.00 m/s collide and stick together. If the angle between their initial directions was 130 degrees , what is their speed after the collision?
38. ### physics

Two wires run parallel to each other with currents I1 = -60.3 A, and I2 = 44.1 A. If they are a = 0.12 m apart, what is the magnitude of the force (N) per meter of length? I used the formula (f/L)=Uo(I1)(I2)/(2(pi)(r)) I got 4.43810^-2(N/m)but it was wrong..I'm not sure what ...
39. ### physics

the magnitude of 2 vectors are 4 and 5 units and the angle b/w them is 30,taking first vectoron x-axis.find the magnitudeof resultant vectorand its direction?
40. ### Physics

A baseball with a mass of 0.145 kg is thrown straight down at the ground. At a particular speed, it has a drag force of 0.4 N acting on it. What is its acceleration at that time? a. -7.0 m/s2 b. -2.8 m/s2 c. -9.8 m/s2 d. -12.6 m/s2
41. ### physics

Use the fact that the speed of light in a vacuum is about 3.00 108 m/s to determine how many kilometers a pulse from a laser beam travels in exactly 4.9 hour(s)
42. ### PHYSICS

IF EARTH WERE TO ROTATE FASTER THAN ITS PRESENT SPEED THEN WEIGHT PF OBJECT WILL DECREASE AT EQUATOR BUT REMAIN UNCHANGED AT POLES why?
43. ### physics

three forces f1,f2and f3,along the same line are acting on abody. if f1=40Nto the right,f2=60N to the right, and f3 is 160N to the left,what is the resultant force of the body?
44. ### Physics

An object is dropped from a platform 100 feet high. Ignoring wind resistance, what will its speed be when it reaches the ground?
45. ### physics

A uniform sheet of surface current density Ks=Ky ay in z=0 plane. find the magnetic field strength H everywhere using ampere's law.
46. ### Physics

What is the total kinetic energy if a 0.30 kg block is sliding on a smooth horizontal surface at 2.5 m/s, heading towards a light spring that is in equilibrium?
47. ### physics

A electric model train travels at 0.339 m/s around a circular track of radius 1.75 m. How many revolutions does it perform per second, i.e, what is the motion's frequency?
48. ### physics

rare element very low carbon are composed of symmetrical triangle that have very much, and which are closely linked in the mirror and solid form what can ...
49. ### Physics

The deepest point in the ocean is 11km below sea level, deeper than Mt. Everest is tall.What is the pressure in atmospheres at this depth?
50. ### physics

A sound registers 77.9 decibels on a detector. What is the intensity in W/m2? Assume the threshold of human hearing is 1.0×10-12 W/m2. Give your answer in picowatts/m2. 1 pW = 1×10-12 W/m2
51. ### physics

A fighter jet is flying at Mach 3.2 in air of temperature 2 degrees C. What is the planes speed? I really don't understand how to do this question. I'd appreciate your help!
52. ### physics

What is the centripetal force of an object undergoing uniform circular motion when its radius is doubled and its speed remains constant?
53. ### PHYSICS

forces of 3N and 4N and 12N act at a point in mutually perpendicular directions. Tha magnitude of the resultant force in newton is
54. ### Physics

A = 145 rock is hoisted upward with an acceleration of 1.46 by a vertical chain of negligible weight. What is the free body diagram?
55. ### physics

what is the minimum effort required to raise a load of 5kg in an ideal pulley system taking gravity to be 10m/s/s
56. ### Physics

Two ants race across a table 76 cm long. One travels at 5.2 cm/s and the other at 2 cm/s. When the first one crosses the finish line, how far behind is the second one? Answer in units of cm. Can you teach me how to do this plz?
57. ### Physics

Compare your weight with the attraction ( or repulsion) force of two One Coulomb charges separated one kilometer. Is it larger, smaller or similar?
58. ### Physics, Class XI

If a force of 15 kg. weight acts on a mass of 14 kg, what will be its velocity after 8 seconds? What is the process to apply the formulas in this question? Please help me fast!
59. ### Physics

If a tank is standing up i.e 1.200 dia x 1.100 high with 650 kg inside, How much water pressure to lift it Cheers
60. ### physics

1 A steel wire, 150 m long at 10¢XC, has a coefficient of linear expansion of 11 „e 10ƒ{6/C¢X. Give its change in length as the temperature changes from 10„aC to 45„aC. 5.8 cm
61. ### physics

How much work must be done to roll a metal safe, mass 116 kg, a distance of 15.0 m across a level floor? The coeffecient of friction is 0.050.
62. ### physics

If a professional jumper jumps in a running trainn and remains in air (say,4 ~5 sec),does he returns back his original position?
63. ### Physics

if a baseball is thrown 30 m/s backwards from a truck moving 50 m/s, how fast will the ball strike the glove of a ground based catcher?
64. ### physics

a 150 metre long train crosses a bridge of length 250 metres in 25 seconds find its velocity
65. ### physics

A electric model train travels at 0.339 m/s around a circular track of radius 1.75 m. How many revolutions does it perform per second, i.e, what is the motion's frequency?
66. ### Physics

If you ask a friend to drive a small nail into a piece of wood placed on top of a pile of books on your head. Why doesn't this hurt you?
67. ### physics

a motorboat travels 25.0 km/h in still water. what will be the magnitude and direction of the velocity of the boat if it is directed upstream on a river that flows at the rate of 4.00 km/h?
68. ### Physics

The deepest point in the ocean is 11km below sea level, deeper than Mt. Everest is tall.What is the pressure in atmospheres at this depth?
69. ### Physics

A dense plastic toy of mass 2.8 kg is floating just beneath the surface of a pond. What is the buoyant force on it? Answer in units of N.
70. ### Physics

Calculate the work done in lifting a 600-N barbell 1.6m above the floor. Express your answer to two significant figures and include the appropriate units.
71. ### Physics

Calculate the radial acceleration of an object at the equator of Jupiter (which takes 0.410 day to spin once), turning with the planet. (in )
72. ### Physics

how far to the nearest tenth of a meter can a runner running at 7.9 m/s run in the time it takes a rock to fall from rest 65 meters?
73. ### explian why please its physics

expliain y the very high specific heat capacity of water leads to formation of land and sea breezes???
74. ### physics

The position of a particle moving along the x-axis is given by x = (13 + 11t − 1.5t2), where t is in seconds and x is in meters. What is the average velocity during the time interval from t = 1s to t = 4 s?
75. ### physics

In a vacuum, a stone and feather fall at the same time. Can you make the assumption that the acceleration of gravity acting on both objects is the same? Explain.
76. ### Physics

A wire length 2m and radius 1mm is stretched by 25mm on application of a force of 1000N.Calculate the young modulus
77. ### Physics

A wire length 2m and radius 1mm is stretched by 25mm on application of a force of 1000N.Calculate the young modulus
78. ### Physics

An object of mass 20kg slides down an inclined plane at an angle of 30 degree to the horizontal. The coefficient of static friction is?
79. ### physics

calculate the impulse imparted to the object in the following collision: a 0.5 kg hockey puck moving a5 35 m/s hits a straw bale, stopping in 1 second.
80. ### Physics

Yes - if it is the same person answering it - it is me again! My question has STILL not been answered... How would I solve for upwards acceleration with this kind of image, assuming mass and force are given.
81. ### Physics

Why "weighing" individual atoms is a particular challenge? Using A small beam arranged as a cantilever, can be utilized as part of a sensing device.
82. ### Physics

A racing car has a mass of 1530 kg. The acceleration of gravity is 9.8 m/s^2. What is its kinetic energy if it has a speed of 136 km/h? Answer in units of J.
83. ### Physics

What is the free-fall acceleration in a location where the period of a 0.594 m long pendulum is 1.55 s s? Answer in units of m/s^2 Show equation too please.
84. ### physics

A 0.15 kg ball is attached to the end of a 0.82 m string and moved in a horizontal circle at 4.3 m/s what net force is needed to keep it in a circular path
85. ### physics

Determine how much water would be present in a 10 tonne sample of lignite, has a moisture content of 65%, before crushing and drying. 10 tonnes is 10,000 kg.
86. ### physics

a baseball is released at rest from the top of a building.it hits the ground after falling for 6seconds . what was the height from which the ball was dropped
87. ### Physics

Three charges (q1 = 8.7 nC, q2 = -7.2 nC, and q3 = -4.8 nC) are at the corners of a square of side a = 9.2 cm, as shown in the picture. Determine the magnitude of the resultant electric force on each charge.
88. ### physics

A 75 kg hockey player glides across the ice on his skates with steel blades. What is the magnitude of the force of friction acting on the skater?
89. ### science/physics

I was in a crosswalk, struck by a truck weighing 3,400 lbs. (traveling at about 8 K/hr) - what was the force per square inch exerted on me?
90. ### Physics

What is its initial vertical speed? The acceleration of gravity is 9.8 m/s 2 and maximum height is 4.7 m ,. Neglect air resistance. Answer in units of m/s
91. ### physics

A sample of charcoal from an archaeological site contains 55 g of carbon and decays at a rate of .877 Bq. How old is it? ok I am totally lost, I don't know where to start
92. ### Physics

If a satellite is orbitting the earth 710km above the earths surface, and it's velocity is 7,406.8 meters/sec, what is it's cetripedal acceleration??
93. ### physics

a hairdryer turns 250J of electrical energy into 50J of heated air. how efficient is this machine and how much is wasted to sound?
94. ### Physics

The wheel is attached to an electric generator and the rotation rate drops from 290 to 230 in 3.5 . What is the average power output?
95. ### 11 grade / physics

a body reaches the max height of 80m when projected at the angle of 30degree find the horizontal component
96. ### physics

When moving at highway speed, a Triumph America motorcycle is capable of accelerating at 2.1 m/s2. At this rate, how long does it take to accelerate from 103 km/h to 88 km/h?
97. ### physics

In order to clearly read a book 16 cm away, a farsighted girl needs an image to be 36 cm from her eyes. What focal length is needed for the lens in her eyeglasses?
98. ### AP Physics

A ball has an initial velocity of 3 m/s. If there is no friction, what is the highest it could roll? What would the qualitative bar graphs and energy flow diagram look like?
99. ### physics

what will be the centipetal acceleration on a man whose mass is 80 kg,when resting on a ground at the equator if the radius of the earth'R' is 6.4x10 power 6 meter.
100. ### physics

For a given velocity of projection in a projectile motion, the maximum horizontal distance is possible only at ө = 45°. Substantiate your answer with mathematical support. 20.5 m/s