# Math/Physics

214,834 results, page 87

1. ### Physics

A television tube operates at 20,000V. What is min wavelength for the continuous x-ray spectrum produced when the electrons hit the phosphor?
2. ### Physics

What is the threshold frequency for the photoelectric effect on lithium (phi= 2.93eV)? What is the stopping potential if the wavelength of the incident light is 400nm?
3. ### Physics

A television tube operates at 20,000V. What is min wavelength for the continuous x-ray spectrum produced when the electrons hit the phosphor?
4. ### physics

Consider the following specific case of the system described in the example above. Suppose the angle θ is 78.0° and the mass of the ball is 7.00 kg.
5. ### physics

A power line 10 meter high carries a current 200 amperes .Find the magnetic field of the wire at ground?
6. ### Physics

Which method of sliding a block of ice requires less force—(a) pushing or (b) pulling at the same angle above the horizontal?
7. ### physics

for the uniform T shaped structure with mass 3M moment of inertia about an axis normal to the plane & passing through O would be

Thirty microcoulombs of NEGATIVE charge experiences an electrostatic force of 27. mN. What is the magnitude and direction of the electric field?
9. ### physics

the mass of the truckand its contents is 7460kg. find the magnitude of the forces exerted by the ground a) the front wheels b)the rearwheels of the truck.
10. ### physics

why is it that drivers place cement blocks and other heavy items in the trucks of their vehicles? (think of friction and normal force)
11. ### Physics

If you are at the top of a toboggan run that is 44.3 m high, how fast will you be going at the bottom, provided you can ignore friction between the sled and the track?
12. ### physics

draw a particle model and a motion diagram for A bike travels at constant speed of 4.0 m/s for 4 s then slow down to come at rest in 3 s.
13. ### 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?
14. ### Physics

1) Please describe the structure of a hurricane,and how they work. Include a discussion of how energy is transferred from the warm ocean water up to the sky.
15. ### physics

A 1.2 lead ball is launched off a cliff top at 16 m/s Determine the balls kinetic energy at position P. Ignore friction
16. ### physics

A circular swimming pool has a flat bottom and a 4.39 m diameter. It is filled with water to a depth of 1.51 m. There is 1.36 atm of pressure on the top surface.
17. ### physics

The coldest and hottest temperatures ever recorded in the United States are -83°F and 135°F, respectively. What is the speed of sound in air at each temperature?
18. ### physics

A glacier advances at 4.3 × 10−6 cm/s.How far will it move in 6.4 years? Assume there is 365 days each year. Answer in units of cm. Thanks in advance!!
19. ### physics

A red flower seen in the light of mercury vapour lamp through a green filter wil appear in what colour?
20. ### Chemistry/Physics

When 1mol of a gas burns at constant pressure, it produces 2430J of heat and does 5kJ of work. Calculate change in H, q, and in kJ?
21. ### physics

A car of mass 200g moving at 15.0m/s is accelerated to 25.0m/s in a time of 10.0 seconds determine the accelerating force and calculate the work done on the body
22. ### physics

A robot arm expends 15J of work to extend a spring 10cm from its equilibrium position. How much force is required?
23. ### PHYSICS

An airplane accelerates down a runway at 3.20 m/s 2 for 32.8 s until is finally lifts off the ground. Determine the distancetraveled before takeoff.
24. ### physics

How much thrust is required to launch a 5 kg bottle rocket with an upward acceleration of 6.4 m/s2? I've gotten 32 because F=MA but I don't understand how to account for gravity. Please help!
25. ### 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.
26. ### physics

two forces of the same magnitude act at a point.the square of their resultant is 3 times the product of their magnitudes.the angle between them is?
27. ### physics

A quantity of steam (750 g) at 122°C is condensed, and the resulting water is frozen into ice at 0°C. How much heat was removed?
28. ### physics

A ball is thrown straight up and reaches a maximum height of 6.57 m . What was its initial speed? The accelera- tion of gravity is 9.8 m/s2 . Answer in units of m/s
29. ### Physics

an aircraft lands on a runway with length of 205 m at a speed of 295 km/h what is the minimum constant deceleration required for a safe landing
30. ### physics

The equation of a SHM of a 600 g object is given as x = 0.45 cos 6.4 t where the displacement x is in meters and time in seconds. What is the total energy of the system?
31. ### physics

You work at a garden store for the summer. You lift a bag of fertilizer with a force of 122 N, and it moves upward with an acceleration of 0.760 m/s2.
32. ### Physics

While rearranging a dorm room, a student does 312 J of work in moving a desk 2.0 m. What was the magnitude of the applied horizontal force?
33. ### Physics

Calculate the components parallel and perpendicular to the plane of 150N gravitational force acting on an object on a slope at 20 degrees to the horizontal ?
34. ### physics

Two forces of the same magnitude act at a point.the square of their resultant is 3 times the product of their magnitudes.the angle between them is?
35. ### Physics

A group of students observes that a wooden block (m = 0.40 kg) on the end of a string with a radius of 0.7 meters makes 9 rotations in 20.7 seconds when twirled.
36. ### physics

A group of students observes that a wooden block (m = 0.40 kg) on the end of a string with a radius of 0.7 meters makes 5 rotations in 20.7 seconds when twirled.
37. ### physics

An object 5 cm high is placed at a distance of 60 cm in front of a concane mirror of focal length10cm .Find the position and size of image
38. ### physics

what is the magnitude kinetic frictional force between a 1500 kg car decelerating at a rate of 5.0m/s^2 skidding across a horizontal road.
39. ### physics

The two sets of magnetic-field coils,used to form the pictures on the screen, are _______ to each other. Parallel or perpendicular
40. ### Physics

A construction crane's cable lifts a 59.5-kg box upward with an acceleration of 1.38 m/s^2. Find the tension in the rope. 501.585 is incorrect.
41. ### Physics

1.For the following simple see-saw calculate: 1. the load that could be lifed, 2. the maechanical advantage (assume the lever is 100% efficient).
42. ### physics

A student, 90.0 m away from the foot of a cliff, claps her hands and hears the echo 0.50 s later. Calculate the speed of sound in the air.
43. ### physics

Calculate the gauge pressure inside a soap bubble 0.0002m in radius using the surface tension for soapy water
44. ### physics

A camera with a lens of focal length 10 cm takes a picture of a 160 cm girl standing 24.0 m away. What is the approximate height of the image?
45. ### mathematical physics

Using Green's theorum evaluate the integral [ integration from c x^2ydx-xy^2dy] where c is the closed curve along the circle. x^2+y^2 = 4
46. ### Physics

What is the linear speed of a child standing 0.4 m from the centre of a steadily rotating merry go around? It makes one complete revolution in 16.0 s.
47. ### Physics

You drop a rock from a 300-meter cliff. How long will it take to reach the ground? Assume it has no significant air resistance
48. ### PHYSICS

A Hammer weighing 3kg strikes the head of a nail with a speed of 2m/s and drives it by 1cm into the wall. find the impulse?
49. ### physics

How long would it take to bring a 318 kg car moving at 11.2 m/s to a complete stop if a 602.8 N breaking force is applied?
50. ### physics

Tony£¬a 110kg football player£¬has a fever of 39celcius. What mass of water must evaporate from his body to cool him to 37celcius£¿
51. ### physics

pls...help, QUESTION = At what depth below the free surface of oil having a density of 600kg/m^3 will the pressure be equal to 1bar.
52. ### physics

an object fall from rest of total height h and covers a distance of h/2 in last second find out time it remain in air
53. ### physics

Calculate the capacitance of a planet, assuming it is a spherical capacitor of radius R = 9050.0 km with charge distributed throughout the volume of the sphere.
54. ### Physics

A 250kg car initially at rest was travelling with acceleration of 10m/s square. Calculate the kinetic energy after 3 seconds
55. ### Physics

Calculate the work required to pull a wagon along a horizontal road for 4.0x10^2 m at a constant speed of 3.0 m/s if the force of friction is 8.0 N.
56. ### Physics

a 4.0 cm high object is placed 5.10 cm from a concave mirror whose redius of curvature is 21.2 cm. Find the inmage distance and the image size.
57. ### Physics

A 5.0cm tall object is placed 16cm from a convex lens with a focal length of 8.4cm. What are the image height and orientation?
58. ### physics

The distance between the midpoints of two metal balls,P and Q,respectively of masses 55 kg and 70 kg,is 80 cm (a)calculate the gravitational force that P exerts on Q thanks in advance
59. ### physics

If the building absorbed so much heat that it turned into a liquid, then it would have undergone a phase change known as _________.
60. ### Physics

Find x and y components of a vector which is 10 units in length and 40 degrees below the +x axis. I honestly don't even know how to begin this problem .. Please help me !
61. ### physics

a fan rotates speed of 600rev per min the power is cut it stopped after 60 rev find time
62. ### physics

An aeroplane lands on the runway at velocity 180km/hour and decelerates at 0.4 m/s^2 find the time taken until it stops and the displacement.
63. ### Physics

How Much Work Is Done Against Gravity In Sliding A 500g Object Through 2m Up A Smooth Plane That Is Inclined 30degree To The Horizontal(g=9.8)
64. ### Physics

An airplane has a takeoff speed of 66m/s. Assuming a constant acceleration of 1.62m/s^2, how long is the plane accelerating down the runway?
65. ### Physics

Two people pushing a stalled car from rest generate a net force of +840N for 5.0s. What is the cars final velocity?
66. ### physics

Two springs have force constant K1&K2 (K1>K2) .each spring is extended by same farce F. If their elastic potential energy are E1&E2then E1/E2)is?
67. ### Physics

A rocket accelerates from rest at 17 m/s2 for 11 s. How far will it cover during this time? Answer in units of m. How do I solve this? do I multiply 17m/s2 by 11 seconds??
68. ### Physics

Calculate the height through which a crane can lift a load of 4 ton when it's motor of 4 H.P operates for 10 sec. Acceleration due to gravity is 10 m/s2
69. ### physics/algebra

82.35 m = (0)t + 1/2(-9.8)t^2 t = 4.1 s is correct Could someone please walk me through this? I could not get an answer because of the negative (maybe my order of operations is wrong) I have no idea!
70. ### Physics

A boy sledding down a hill accelerates at 2.33 m/s2 . If he started from rest, in what distance would he reach a speed of 8.70 m/s? Answer in units of m
71. ### physics

an object falls directly from a plane flying horizontally at an altitude of 10000ft at 50mi/h. how long will it take to hit the ground?
72. ### Physics

Forces of 10.3N north, 19.5N east, and 15.2N south are simultaneously applied to a 4.06kg mass as it rests on an air table. What is the magnitude of its acceleration?
73. ### 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?
74. ### physics

when starting a foot race a 66 kg sprinter exerts an average force of 640 N backward on the ground for 0.85s. What is his final speed in m/s?
75. ### Mabel hill, physics

Two force,3N and 4N act on a body in the direction due north and east respectively. Calculate their equilibrium?
76. ### Physics

If a rocket is launched at an initial speed of 120m/s at an angle of 25 degrees, find the time of flight, range, and it's highest height.
77. ### Physics

How does an electric motor work, linking to the theory of electromagnetism? I have already identified a few laws: -Ohms -Faraday's
78. ### Physics

The steel I-beam in the drawing has a weight of 5.22 × 103 N and is being lifted at a constant velocity. What is the tension in each cable attached to its ends?
79. ### Physics

Since friction is a force, how do you determine its magnitude and direction? Use a box sliding across a carpet to illustrate your answer
80. ### physics

So basically I got this question and it's baffling. Over a distance of 5m the speed of a bicycle increase's from 2ms to 5ms what I's the magnitude of acceleration?
81. ### Physics HELP

A bug on a picnic table travels 10 cm east, then 18 cm northward, and finally 20 cm westward. What is the bugs displacement relative to its original position?
82. ### physics

Explain two different reasons why fibreglass is used to fill the space between the concrete block and the metal casing.
83. ### physics

if a worker pushes a box 3 times as far as you do and exerts double the force you applied, which one of you does more work and by how much?
84. ### Physics

A ceiling fan of radius 1.0 m is rotating with a frequency of 300 RPM. How fast (in m/sec) is the tip of one of the blades moving?
85. ### physics

A skier (m=55.0 kg) starts sliding down from the top of a ski jump with negligible friction and takes off horizontally. If h = 4.90 m and D = 10.6 m, find H.
86. ### physics

How much would the time keeping of a pendulum clock be affected by taking it to the moon? Gravity is 1.6m/s ^2, compared with 10m/s ^2 on the earth.
87. ### Physics

An astronaut on board a spacecraft is in orbit around the earth in uniform circular motion. Is her velocity speed and acceleration constant?
88. ### physics

What must be the radius of an unbanked (flat) curve so that a car can safely travel at a maximum speed of 39 m/s? The coefficient of static friction is 0.70.
89. ### physics

a stone propelled from a catapult with a speed of 50ms-1 attains a height of 100m. Calculate the time of flight and the angle of projection
90. ### physics dimention

the force of capillarity in plant is given by F=yrgh/2,where y is the coefficient of surface tension.Is this equation correct or not? justify your answer.
91. ### PHYSICS

A ball is thrown upwards .the distance covered by it during of last 2 second before it reaches the maximum height is ???? Find answer
92. ### Physics

A 26-lb. force vector that makes an angle of 101° counterclockwise from the -y direction. Determine the x and y components of the following three vectors in the xy plane.
93. ### Physics

In what ratio the mass 4m should split so that value of gravitational force comes Maximum for a fix distance d between the masses?
94. ### Physics

In what ratio the mass 4m should be split so the value of gravitational force comes maximum for a fix distance d between the masses? F=G(4m-x)/r^2 G/r^2(4m-x^2)
95. ### Physics

with what minimum speed must a ball be thrown straight up in order to reach a height of 34 meters above the launch position?
96. ### physics

a man holds a child on his shoulders while watching a football match. How much work has he done if the game lasts for 2 hours
97. ### Physics

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

W.K.T, Magnetic Force qvB=mv^2/r ... n we know how to prove it too.... But how to show that the radius of curvature of the circular path is proportional to the linear momentum of the charge ?
99. ### Physics

A dense plastic toy of mass 1.8 kg is floating just beneath the surface of a pond. What is the buoyant force on it? Answer in units of N.
100. ### 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