# Math/Physics

215,876 results, page 57
1. ## Physics

A soccer ball is kicked with an initial speed of 27 m/s at an angle of 20° with respect to the horizontal.
2. ## physics

If the density of a medium is 1000 kg/m3 and the propagation speed is 1540 m/s, the impedance is rayls.
3. ## physics

Explain the changes in frequency with respect to changes in mass, length tension on sonometer bridge.
4. ## physics

How much spring elasticity would be needed to make a 50 pound child jump higher
5. ## physics

The three vectors in the figure below have magnitudes a = 2.45 m, b = 3.15 m, and c = 15.0 m and angle θ = 36.5° find x component of vector a
6. ## physics

calculate the speed of an 7.3*10^4kg airliner with a kinetic energy of 1.4*10^9J. answer in units of m/s.
7. ## Physics

The minimum distance between particles in a wave that have the same displacement and are moving in the same direction is called?
8. ## physics

A man walks 5.0m due east and then 10.0m N30oE . Find his resultant displacement
9. ## physics

Can an adult male be rescued from a fall by tying a rope to a car's axle?
10. ## physics

A spaceship has a momentum of 20,000 kg·m/s to the left; its mass is 500 kg. What is the magnitude of its velocity?
11. ## physics

How much heat (in kJ) will it take to bring 56 kg of ice at -8°C to dry steam? Answer to 3 significant figures
12. ## physics

what has no beginning and no end. it is also considered as the medium for light in einstein's theory of relativity
13. ## Physics

what is your power output if you climb a 2m ladder in 10 seconds? suppose your height is 565N.
14. ## Physics

What distance does Anna covered by running on a circular track of length 500m?
15. ## physics

how much heat is required to change 400g of ice at -20c into steam at 120c
16. ## Physics - projectile

a ball is thrown straight up at 50 m/s. What speed will it be when it returns to the thrower's hand?
17. ## PHYSICS!!

free body diagram of a 4 kg bucket accelerating downward 2 meters per second squared
18. ## Physics

(a) Calculate the speed of a proton after it accelerates from rest through a potential difference of 285 V.
19. ## physics

State how the centripetal force is provided in the case of a satelite orbiting the earth
20. ## physics

5. What is the electric potential at the center of the square shown in the figure below? Assume that q1 = 1 x 10-8 C, q2 = -2 x 10-8 C, q3 = 3 x 10-8 C, q4 = 2 x 10-8 C and d = 1 meter.
21. ## Physics

A 4.26 kg block starts up a 33.0 degree incline at 7.81 m/s. How far will it slide if the coefficient of kinetic friction is 0.23?
22. ## Physics

What is the net force required to accelarate a 2000kg car to 6m/sec us equation F=ma
23. ## Physics

How close would the masses 0.545 kg and 0.109 kg have to be in order for the gravitational force between them to have a magnitude of 1.03 N? Please Help!
24. ## Physics

Find the maximum height reached by a ball thrown upward at a velocity of 95 ft/s
25. ## physics

If a spring has a constant of 20N/m how much potential energy does it store if it is compressed 2m in joules? <3
26. ## physics

a 10-kg bos slides down a frictionless ramp with acceleration 3.6 m/s calculate the weight anlge? f ?
27. ## physics

A force of 3000 N is applied to a 1500-kg car at rest. (a) what is its acceleration? (b) what will its velocity be 5 s later?
28. ## physics

c) A penny sits 12 cm from the center of a record turning at 33 1/3 rpm. What is the tangential speed in m/s?
29. ## physics

a 27,000kb freight train starting at 12m/s then speeds up to 45 m/s in 35 seconds. what is the acceleration?
30. ## Physics

KNOWNS: Diverging (convex) mirror Radius of curvature = 60 cm (f = 30 cm) M = 1/5 Hi = 20 cm UNKNOWNS: Ho? Di? Do? EQUATIONS: 1/Do + 1/Di = 1/f M = Hi/Ho = -Di/Do
31. ## Physics

Charges q1 and q2 lie on x axis at points x= -a and x= 5, respectively. (a) how must q1 and q2 be related for the net force on charge +Q at x = a/2 to be zero ? (b) and if +Q is placed at x = 3a/2.
32. ## physics

Devise a method for measuring the coefficient of friction between two surfaces using an inclined plane
33. ## physics

Find the density of a substance whose mass is 28 grams and whose volume is 4 cubic centimeters
34. ## Physics 11

A girl stands 2.5 m infront of a plane mirror. If she sees someone else 2.0 m behind her, how far is she from the image of that person?
35. ## physics

Much much force is needed to push a container with wheels that weighs 250 pounds
36. ## physics

what force must the woman in Figure 3.38 exert on the floor with her hands in order to do a pushup?
37. ## Physics

90.0g of copper (c=390J/kg*oC) at 80.0°C are added to 270g of water at 20.0°C. What is the final temperature of the mixture?
38. ## Physics

When calculating delta Tsample,why is th initial temperature taken to be 100 degrees Celsius
39. ## 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?
40. ## physics

An electron with initial speed = 2.54×10^7 m/s is traveling parallel to an electric field of magnitude = 1.66×10^4 N/C .
41. ## physics

Consider the static equilibrium diagram below. What is the net force acting along the positive x-axis?
42. ## Physics

If the cosmic microwave background radiation (CMBR) is at a temperature of 2.7K, what is its peak wavelength?
43. ## physics

calculate the impulse necessary to stop a 1500 kg car travelling at 90km/hour
44. ## Physics

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

If a racer runs at an average speed of 7m/a how far will she run in 1 min 45 seconds?
46. ## physics

what is the height of the ball if the bottom of the swing is zero, speed is 2.8m/sec, 9.81 acceleration of gravity
47. ## physics

What is the evidence for the claim that iron exists in a relatively cool outer layer of the sun?
48. ## physics

Work out the gravitational potential energy of a 2kg brick at a height of 9 metres.
49. ## Quick Physics Question

Are both linear and angular momentum conserved in static equilibrium ?
50. ## physics

how much torque do you exert if you push perpendicularly on a door with a force of 30 N at a distance of 0.85 m from its hinges
51. ## physics

A wheels is turned at prequency at 2.0 revelation per second and then is allow to come to rest. If it those so in 30sec ? How far did it turn in aprocess
52. ## physics

How long would it take for a stone to fall 250m traveling at a speed of 10m/s squared?
53. ## physics

describe with the aid of a fully labelled diagram the features and their uses of a bicycle pump
54. ## Physics

What is the tension in a 1-meter string that is spinning a 0.5-kg rock in a horizontal circle 3 times per second?
55. ## physics

In what direction and with what speep must he push away his pack in order to return to his vehicle in 30s?
56. ## Physics

8. Fire engines used to be red. Yellow-green is now the preferred color. Why the change?
57. ## Physics

What is the significance in the observation of discrete spectral lines in the emission spectrum of hydrogen??
58. ## Physics

What is the rotational inertia of a 10 kg rod with a length of 0.9m and rotating about an axis passing through its end?
59. ## physics

An object is dropped onto the moon (gm = 5 ft/sec2). How long does it take to fall from an elevation of 250 ft.?
60. ## physics

Explain why you don’t need a displacement vs. distance graph for light, but you do for other traveling waves.
61. ## Physics

consider the circuit in the figure. find the current in the 13 ohm resistor. Answer in units of A
62. ## physics

A constant 6.0N net force acts for 4.0 s on a 12 kg object. what is the objects change of velocity
63. ## Physics

A polar satellite is launched at 850 km above earth.find its orbital speed
64. ## physics

What is the gravitational potential energy of a ball with a weight of 72 N when it is sitting on a shelf 1.4 m above the floor?
65. ## Physics help!!!

What potential difference is required in an electron microscope to give electrons a wavelength of 0.05 nm ?
66. ## Physics (HELP)

An object inside of the focal point of a concave mirror produces an image that is...
67. ## Physics

Sodium has bcc packing. If a distance between two nearest atoms is 3.7 A* then what is the lattice parameter?
68. ## physics

Which of the following is forward biased? (i canna draw so plz manage wid dis) (0V)-------pn-------(-2V) (-4V)-------pn-------(-3V) (-2V)-------pn-------(2V) (3V)-------pn-------(5V)
69. ## Physics

What is the average power output of a weightlifter who can lift 260 kg to a height of 1.9 m in 1.8 seconds?
70. ## Physics

Make an analogy between heat capacity and density. Describe which quantities correspond to one another. Thanks!
71. ## Physics

A cheeta can run with a speed of 29 m/s. Determine the distance travelled by a running cheetah in 8.6 s. D= 29/8.6 = 3.3s
72. ## Physics

At what speed must a 950 kg subcompact car be moving to have the same kinetic energy as a 3.2*10^4 kg truck going 20 km/h ?
73. ## physics

a car starts from rest and accelerates uniformly at 2m/s for 10second. what is its velocity at the end of 10 second?
74. ## Physics

What is the kinetic energy of a 1100 kg sports car traveling down the road with a speed of 22 m/s?
75. ## Physics (HELP)

A real image is usually inverted, but can be upright in special cases. True or false?
76. ## physics

a gun shoots a potato from a height of 6 feet. how long does it take to hit the ground.
77. ## Science physics

How would the voltage output be affected if the armature is made to spin faster?
78. ## Physics

How long does it take a car to change it velocity from 15m/s if it accelerarate uniformly at 5m/s square?
79. ## Physics

The index of refraction of water is 1.33. What would be the speed of a light wave passing through at this medium? 4 x 10^8 m/s 2.3 x 10^8 m/s 4.4 x 10^-9 m/s 2.6 x 10-^9 m/s
80. ## Physics

The index of refraction of water is 1.33. What would be the speed of a light wave passing through at this medium? 4 x 10^8 m/s 2.3 x 10^8 m/s 4.4 x 10^-9 m/s 2.6 x 10-^9 m/s
81. ## Physics

A 3200kg helicopter must accelerate up at 1.0m/s^2. What minimum lift do the rotors need to produce? Thanks for answering!
82. ## Physics

A fuel has heat of combustion equal to 30 kJ / g. How much energy is released when 5 kilograms are oxidized?
83. ## physics

How much energy becomes unavailable for work in an isothermal process at 440 K, if the entropy increase is 25 J/K
84. ## Physics

In what distance can a 25 gram bullet traveling at 250m/s be stopped by force of 5000N?
85. ## Physics (HELP)

The index of refraction of diamond is 2.42. What would be the speed of a light wave passing through a this medium? 8.1 x 10 ^-9 m/s 1.2 x 10^8 m/s 7.3 x 10^8 m/s 9 x 10^-9 m/s
86. ## Physics 30

If a truck moving at 30km/hr accelerates at 2.5m/s^2 to 50 km/hr, what time (in sec) does it take? a. 2.22s b. 5.56s c. 8 s d. 28.8s
87. ## Physics

What is the typical wavelength of an X-ray ? I searched google and I couldn't find it. If you know the answer I'd appreciate it .
88. ## physics

An arc lamp operates at 80V . suggest a method to use it with 240 V d.c. source
89. ## physics

If one walks straight up a 10 degree incline, what is the height achieved after walking 10 kilometers ?
90. ## Physics

a westward force of 20 N acts on a 2.0 kg object moving eastward at 60 m/s for 2.0 s. What is the resulting velocity?
91. ## Physics

What is the capacitance of a capacitor that stores 5.2 μC of charge on its plates when a voltage of 4.8 V is applied between them?
92. ## physics

what is the maximum downward accelaration you can give your hand in m/s^2 i was thinking 10 due to gravity
93. ## physics

An electron and a proton that are placed in an electrical field both accelerate equally. True or False?
94. ## physics

if a bowling ball with a 22 cm diameter is half way submerged in a bucket of water, what is its mass?
95. ## Physics

As a rocket accelerates upward, its thrust remains constant but its acceleration increases. what is the cause of this?
96. ## physics

what pressure would you expect if the gas in the flask were heated to 150 degrees celsius?
97. ## Physics

What is the amount of CO2 added to the earth's atmosphere each year from fossil fuels?
98. ## Physics

Air in a balloon does 50 J of work while absorbing 70 J of heat.What is its change in internal energy?
99. ## physics

using well labelled diagrams,briefly describe how you would determine the density of an irregular object
100. ## physics

A particle starts moving with acceleration 2 m/s2. distance travelled by it in 5th half second is..??