74,641 results, page 74

1. ### physics

Two forces 5N &10N are acting at an angle of 120° between them. Find the resultant force in magnitude and direction.
2. ### physics

1) How many seconds does it take a car traveling 40 mph, decelerating at a rate of 7 miles per second, to come to a complete stop? 2) How many feet?
3. ### physics

A 0.150-kg ball, moving in the positive direction at 12 m/s, is acted on by the impulse of 4N*s what is the balls final velocity
4. ### physics

at what angle with respect to the horizontal should the shot put be launched if the starting height is 2.0m to have the greatest range?
5. ### physics

Why do many musicians wear earplugs during their performances even though the intensity of the sounds produced is lower than the threshold of pain?
6. ### Physics-Electricity

Consider three charged particles placed along the x-axis. The particle with q1 = 9.30 nC is at x = 6.87 m and q2 = 4.09 nC is at x = 0.600 m. Where must a positive charge, q3, be placed such that the resultant force on it is zero? x=?m
7. ### Physics

what type of heat transfer does solar hot water heating use? (conduction, convection, radiation)
8. ### Physics

An object is in free fall. At one instant, it is traveling at 41 m/s. Exactly 3.2 s later, what is its speed? The acceleration of gravity is 9.8 m/s2 . Answer in units of m/s
9. ### physics

I have do a project on graphical methods representing vector quantities with 5 examples and graphs. Please let me know where will I get the required info.
10. ### Physics

Michael Jordan’s vertical leap was measured to be 122 cm. What was his takeoff speed, and how long would he be in the air?
11. ### Hurricane Project for Physics Class

1) Please describe the typical path(s) for hurricanes. Is this part of the pattern of convection?
12. ### Physics Dynamics

An arrow has an initial launch speed of 32 m/s. If it must strike a target 38 m away at the same elevation, what should be the projection angle?
13. ### physics

How fast will a roller coaster, with a mass of 1200 kg, be moving at the bottom of an 18 meter tall hill?
14. ### Physics

What is the change in momentum for a 5,000 kg ship in outer space that experiences no net force over a 1 hr period?
15. ### physics

a man weighing 500N runs up a staircase half a minute he rise up by 4m. a.what work did he do? b.what was his power?
16. ### physics

A body is projected vertically upwards at a speed of 63m/s. if g = 9.8m/ s². Find the maximum height reached?
17. ### physics

If there were no air drag, how fast would drops fall from a cloud 2.4 kilometer above the Earth's surface? answer in m/s.
18. ### Physics

A stone is thrown vertically upward, after't'second it covers a distance of's' metre, where 's'=80t-16t2. It's velocity after 2 second?
19. ### physics

A kangaroo jumps straight up to a vertical height of 1.19m, how long was it in the air before returning on earth
20. ### physics

Electric power is found by multiplying ___ by current. Is voltage or potential difference a better choice to use?
21. ### Physics

A satellite that is 4175 miles from the center of the earth, orbits with a period of 90 minutes. What is its centripetal acceleration?
22. ### PHYSICS

Which simple machine has more mechanical advantage a pulley or a inclined plane? PlEASEE HELP SUPER CONFUSED
23. ### PHYSICS

Calculate the centripetal force on a 2100 kg carrounding a curve of 175 m radius at a speed of 60 kph.
24. ### Physics

What is the power of an engine that pulls a 1000kg automobile at a steady speed of 10m/s along a level road?
25. ### Physics

How much work did the movers do to push a 49.0 kg crate 10.3 m across a rough floor at a speed of 2.9 m/s with a horizontal pushing force of 48 N ?
26. ### physics

suppose that the two person,each of mass 100kg are 3meter a part in outer space.what is the magnitude of the gravitational
27. ### Physics

A traffic light is hanging from two cables tilted at 37 and 42 degrees. If it has a mass of 2.3 kg find the tension in each cable.
28. ### physics

A speedboat increases in speed from 19 m/s to 31.4 m/s in a distance 193 m. Find the magnitude of its acceleration. Answer in units of m/s
29. ### PHYsics 101

How much heat must be added to 4.00 kg of aluminum to cause its temperature to rise from 22°C to 252°C unit of answer must be Joule
30. ### Physics

The earth has a radius of 6380 km and turns around once every 24 hours. What is the average speed of a person resting at the equator?
31. ### Physics

Repairing a spaceship CJ drops a hammer and it took .68 s to fall .90 m to the ground. What is the magnitude of the gravitational accerleration on mars
32. ### Physics

A laser is aimed at the moon. The spot of light is seen on the lunar surface 2.37 s later. What is the distance from Earth to the mooon
33. ### Physics

From what height would a car weighing 9990 N have to fall to gain the kinetic energy equivalent to what it would have when traveling 64.87 mi/hr?
34. ### Physics

Why do we rationalize a denominator? The only reason I can think of and can find in a search is to reduce it because it makes it simpler but is not necessary. Help! I have to write a paper on it.
35. ### physics

How many times will the incident beam shown in Figure P25.3 (x = 1.10 m, y = 1.80 m) be reflected by each of the parallel mirrors? mirror on the right
36. ### Physics

Eight books, each 4.1 cm thick with mass 1.8 kg, lie flat on a table. How much work is required to stack them one on top of another?
37. ### physics

If a person does 80 J of work in moving a 30 \rm{kg} box over a 13 m distance on a horizontal surface, what is the minimum force required?
38. ### physics

What amount of energy is used if 800 C of charge passing through a load with a potential difference of 120 v? answer is 9.6e+4
39. ### Physics

How much work is needed to move a -8.00 uC charge from the ground to a point whose potential is +75.0V ? I know -8.00 uc = -0.8 x 10^-6 then I used W = Fd but I can't seems to get right answer any hint is appreciated.
40. ### physics

an object undergoes an acceleration of 10m/s2 starting from rest. find the distance travelled by it in seconds
41. ### physics

a50g ball is hit to roll by a force of 100N.it rolls over 20m.what was its initial speed
42. ### physics

An object sits 29m above the ground and has a mass of 47 kg. How much potential Energy does it posses 1.5 seconds after falling?
43. ### physics

car doing 60 mph and skids for 52.3 meters what is the speed at end of skid co/friction is 0.693 urgent help please
44. ### physics

power applied to a particle varies with times as p=3t^2-2t+1 Watt where t is in second. And the change in its kinetic energy b/w time t=2s t=4s
45. ### Physics

What is the acceleration of a skateboard down a ramp inclined at 19.5 degrees to the horizontal? 3.271 is the answer. This shouldn't be too tough, but I can't get it. Thanks!
46. ### Physics

I don't understand what formula to use for this question: Points A and B each have an electric potential of +9 V. How much work is required to take 1 mC of charge from A to B? Thank you
47. ### physics

you slide down a pole at a mass of 80kg with an acceleration of 4m/s^2, How do you show that the friction force that acts on you is 480N?
48. ### Science Physics

How many Btu of heat must be added to 1200 lb of copper to raise its temperature from 100°F to 450°F
49. ### Physics

A race car moving at 35 m/s is uniformly slowed to a stop in 50 s. Find 1) acceleration, and 2) stopping distance.
50. ### physics

1. At what distance above the Earth (mass of 5.97 x 1024 kg and radius of 6.38 x 106 m) would a satellite have a period of 125 min?
51. ### physics

While running a race, Abigail’s heart was beating at 170 beats per minute. What was the period of her heartbeat?
52. ### Physics

Calculate the earth's orbital angular speed in radians/sec due to its motion around th sun.
53. ### 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
54. ### hi

Find the book's acceleration (positive for up, negative for down). .... physics An object with mass m = 20 kg is released from a height h = 60 m above the ground.
55. ### physics

you chop 50 g of ice at 0 degrees celsius into 200g of water at 40 degress celcius. What is the final temperature?
56. ### physics

a skater holds her arms outstretched as she spins at 140 rpm. What is the speed of her hands if they are 125 cm apart?
57. ### physics.

Describe constructive and destructive interference in terms of the combining of crests and troughs and the reesulting amplitude.
58. ### Physics

a 10-kg bos slides down a frictionless ramp with acceleration 3.6 m/s calculate the weight....the angle and normal force
59. ### Physics

a 10-kg bos slides down a frictionless ramp with acceleration 3.6 m/s calculate the weight....the angle and normal force
60. ### physics

How close must two 1.0 C charged objects be for their mutual force to exceed 1.0 N? Compare that distance to something in your everyday life.
61. ### physics

What is the magnitude of force required to accelerate a car of mass 1.7 Ã— 10Â³ kilograms by 4.75 meters/secondÃ†?
62. ### physics

Find the first two harmonics of a linear mass density .002 kg/m and length 0.60m when it is subjected to tension of 50 N.
63. ### Physics

The length of wire is 25.5cm and it's radius is 1.02mm. Calculate the percentage error in mesurement of its volume
64. ### physics-heat transfer-urgent pls

Calculate the energy absorbed when 8.5g of ice is melted at 0 Celsius. thank you
65. ### AP Physics

How fast (in rpm) must a centrifuge rotate if a particle 6.0 cm from the axis of rotation is to experience an acceleration of 130000 g's
66. ### Physics

A ball starts 1.175 meters off the ground and shot at an angle of 40 degrees with a velocity of 3.2 m/s. Where does it land?
67. ### physics

If you use a horizontal force of 30.0 N to slide a 12.0 kg wooden crate across a floor at a constant velocity, calculate the acceleration.
68. ### physics

Explain the statement: the saturation vapour pressure of water at 60 degree Celsius is 149.4 mm of Mercury. Thanks
69. ### Physics

A magnifying glass (a positive lens) with a focal length of +6 cm is placed 2 cm above a page of print. What is the magnification of this image?
70. ### physics

How would you determine the value of the specific latent heat of steam in the laboratory? What precautions are necessary to obtain an accurate results
71. ### Physics

Two forces whose resultants is 100N are perpendicular to each other. If one of them makes an angle of 60 degree with the horinzontal. Calculate its magnitude
72. ### physics

What is the longest wavelength for standing sound waves in a 102.0 cm long tube that is open at both ends?
73. ### physics

Charge polarization is normally produced by: nuclear interactions. contact. induction. friction. electrostatic means.

Could someone provide me with a simple explanation of how the Doppler Effect is used to determine the speed and direction of moving object
75. ### Physics

a 10-kg bos slides down a frictionless ramp with acceleration 3.6 m/s calculate the weight....the angle and normal force
76. ### physics

a 200N sign is held by two wires that have 150 degree angle between them. find the tension in each wire.
77. ### physics

A large boulder is ejected vertically upward from a volcano with an initial speed of 41.0 . Air resistance may be ignored.
78. ### physics

I'm trying to find the pressure exerted by an object that has a force of 180 newtons on an area of 10 square centimeters
79. ### Physics

A block weighing 9.7 N requires a force of 2.6 N to push it along at constant velocity. What is the coefficient of friction for the surface?
80. ### physics

a particle moving on a circlehas a velocity of m/s and normal acceleration of 10m/s2.determine the radius of the circle.
81. ### physics

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

Find the entropy change when 51g of steam condenses to water at 100 ∘C.
83. ### Physics

A body is thrown up with a velocity of 78.4m/s.find how height will with rise and how much time if it take to return its point of rejection?
84. ### Physics help

how would you investigate if the half life of water dripping from a burette is constant? I know the method but what equation and principle would ya'll use?
85. ### physics

A motorcycle of mass 350kg has an acceleration of 3m/s when the resistance against motion is 200N.Calculate the force required
86. ### Physics

The voltage across a lamp is (6.0 +_ 0.1) V and the current flowing through it is (4.0 +_ 0.2) A. Find the power consumed with maximum permissible error in it?
87. ### Physics

How many calories are absorbed by a copper spoon with a mass of 200 grams as it changes from 28°C to 33°C? A) 0.00027 B) 3 C) 90 D) 13,000 And this one. How do i solve this one?
88. ### Physics

How much heat must be transferred to each kilogram of aluminum to bring it to its melting point, 660°C, from room temperature, 20°C?
89. ### physics

harry takes a space voyage and returns to find his twin sister has aged more than he has. This is evidence that they have been in different?
90. ### physics

With an average acceleration of -.56 m/s2, how long will it take a cyclist to bring a bicycle with an initial speed of 13.3 m/s to a complete stop?
91. ### Physics

Given a free falling object that is initially at rest, what are the objects displacement, velocity, and acceleration after 9 seconds?
92. ### Physics

if the body describes a vertical circle then the minimum velocity at angle theta from lowest position is
93. ### Physics

If the rate of continental drift were to abruptly slow from 1.0 cm/y to 0.5 cm/y over the time interval of a year, what would be the average acceleration?
94. ### physics

A bicycl rider starts from rest and moves with uniform acceration of 1.5m\s^2 it is velocity reachs 7.5m\s of a distance .......
95. ### physics

A square conducting slab with 7 m sides carries a net charge of 89 mu or micro CC. what is the electric field?
96. ### physics

Why do many musicians wear earplugs during their performances even though the intensity of the sounds produced is lower than the threshold of pain?
97. ### physics

What is the maximum acceleration a car can undergo if the coefficient of static friction between the tires and the ground is 0.24? a_{max} =
98. ### Physics

How high will you be when you stop rising if you jump upward with an initial vertical speed of 2 m/s? Answer to the nearest 0.1 m, and use g = 9.80 m/s2.
99. ### Physics

How much work does spike do when he pulls a 50 kg sled with a force of 200 N with a rope at an angle of 30 degrees above the horizontal, 20 m?
100. ### Physics

A certain radioactive element has a half liv of 20days, how long does it take 3/2 of the atom originally present to disintegrate