# physics please HELP !

74,641 results, page 62

1. ### Physics

Two identical gliders slide toward each other on an air track. One moves at 2 m/s and the other at 1 m/s. If they stick together, the combination slides at? Why?
2. ### physics

D=m/V=m/ð•R^2•h Find the density of a 4.2- kg solid cylinder that is 13 cm tall with a radius of 5.0 cm. I am lost on the numbers to plug into this one please help
3. ### physics

Calculate the distance you will travel if you maintain an average speed of 12km/h for one-half hour.
4. ### physics

if 20g of steam at 100 c is mixed into 80 g of water at 20 c what is the final temperature if no heat lost
5. ### physics

What is the period and frequency of a 10-pound weight oscillating (as a pendulum) on a 5-meter-long rope?
6. ### physics

What is the longest wavelength for a standing wave, in the same length tube, that is open at one end and closed at the other?
7. ### physics

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

A 100g bird siis in its nest. what is the Fnet(net force) in this case?
9. ### physics

A stone is thrown straight up. To reach a height of 6.74 m above its release point, what must its initial speed be in m/s
10. ### physics

A car travels in a straight line for 4.5 h at a constant speed of 61 km/h . What is its acceleration? Answer in units of m/s2.
11. ### ap physics

You measure the radius of a wheel to be 4.16 cm. If you multiply by 2 to get the diameter, should you write the result as 8 cm or as 8.32 cm? Justify your answer.
12. ### physics

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

A aluminum wire has a diameter and uniform electric field of imposed along its entire length
14. ### Physics

If a man weighs 900 N on the earth, what would he weigh on jupiter, where acceleration due to gravity is 25.9 m/s^2?
15. ### Physics

If a force of 15.0 N directed east acts on a stationary 5.00 kg mass, what are its acceleration, displacement, and velocity after 10.0 s?
16. ### PHYSICS

compute for the density of a brake fluid used in a car which has a volume of 600cm^3 and a mass of 100 g?
17. ### Physics

Calculate the radial acceleration of an object on the ground at the earth's equator in m/s2, turning with the planet.
18. ### Physics

Janetjumpsoffahighdivingplatformwith ahorizontalvelocityof2.96m/sandlandsin thewater2.8slater. Howhighistheplatform ?Theacceleration ofgravityis9.8m/s2.
19. ### Physics

h t t p : / / b i t . l y / 9 S F F F o a) What is the minimum value of F needed to move the two blocks? b) If the force is 10% greater than your answer for (a), what is the acceleration of each block?
20. ### PHYSICS

a 3000 N car is moving at 12.0m/s comes to a stop while skidding a distance of 25.0m. what is the coefficient of kinetic friction?
21. ### Physics

A 5 N force directed to the west acts on an object for 2.0 seconds. What is the change in momentum of the oject? Would it be 5 X 2?
22. ### physics

a baseball is thrown horizontally at a velocity of 35 m/s from a height of 1.5 m. How long does it take to hit the ground? how far does it travel?
23. ### physics

what is the distance traveled by a vehicle in 12 minutes, if it's speed is 35km/h? And the answer I got was 7km but I got it wrong. Please help!
24. ### 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?
25. ### physics

A spring has k = 88 N/m. Use a graph to determine the work needed to stretch it from x = 3.6 cm to x = 5.6 cm, where x is the displacement from its unstretched length.
26. ### Physics

Two violin players tuning their instruments together hear 8 beats in 2 s. What is the frequency difference between the two violins
27. ### 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
28. ### 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?
29. ### pure maths, agriculture,life sciences, physics

i want to know what does those subject i choose fall under which career
30. ### physics

Power applied to a particle varies with time as P=(3t^2-2t+1)W. Find the change in kinetic energy between t=1s and 4s.
31. ### Physics

1. Could a horizontal axis of rotation be used satisfactorily in an experiment uniform circular motion? Explain
32. ### Physics

What is the gravitational force between a proton and an electron in a hydrogen atom if they are separated by distance of 5.29x10^-9 cm.
33. ### Physics

With what maximum speed can an unsecured passenger stay in their seat on a Ferris wheel that has a diameter of 12 m.
34. ### Physics

is that right ideal gas only obey the boyles law under high temp and low pressure?
35. ### Physics

What minimum speed does a 170 g. puck need to make it to the top of a 6.0 m. long, 27 frictionless ramp?
36. ### physics

Calculate the velocity time graph of a body at rest is given an initial uniform acceleration .
37. ### 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?
38. ### physics

Calculate the velocity time graph of a body at rest is given an initial uniform acceleration.
39. ### physics

If an armadillo can leap to 0.5m height, how fast must he be moving vertically when his feet just lift off the pavement?
40. ### Physics

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

Two objects attract each other gravitationally with a force of when they are 0.25 m apart. Their total mass is 4.00 kg. Find their individual masses
42. ### physics

Using gauss's law,calculate the electricfield at a distance r=20cm from a point charge q=4microcoulomb.
43. ### physics

a2kg hockey puck is sliding across the frictionless ice at 6m/s.how much force is required to keep it moving at 6m/s
44. ### physics

a block of wood of 200g is thrown vetically with a veloncity of 20mls what is the pontential energy?
45. ### Physics

A 1200 kg sports car accelerates from 0m/s to 27m/s in 10s. What is the average power of the engine?
46. ### Physics

You throw a ball downward from a window at a speed of 2.7 m/s. How fast will it be moving when it hits the sidewalk 2.9 m below?
47. ### Physics

Two protons, an infinite distance apart are brought together to a separation of 1 nm. What is the initial potential energy of the system?
48. ### 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?
49. ### physics

What is the magnitude of the momentum of a car weighing 1,555 N when it is moving at a speed of 23 m/s? Express your answer in kg m/s.
50. ### physics

A bus is moving at a speed of 20m/s beyond to slow at a constant rate of 3m/s each second find how far it goes before stopping
51. ### Physics HELP!!

What is the de Broglie wavelength of an electron that strikes the back of the face of a TV screen at 1/10 the speed of light?
52. ### physics

Write the equation for fill factor in terms of V_max, V_oc, J_max, and J_sc. FF =
53. ### PHYSICS Gr.11

i am completely confued :( what are balanced and unbalanced forces? How can u tell by looking at a free body diagram and/or a problem? thanks
54. ### 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?
55. ### 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?
56. ### Physics

find the altitude change of a 10,000 kg fighter which climbs and in doing so loses 100 m/s of airspeed
57. ### 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)
58. ### Physics

How many calories of heat will a person lose by evaporating 1250g of water and perspiration in a day?
59. ### physics

You throw a ball downward from a window at a speed of 1.9 m/s. How fast will it be moving when it hits the sidewalk 2.2 m below?
60. ### 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
61. ### PHYSICS ASAP!

A Football is kicked 66.6 meters in 5.39 seconds. What was the initial velocity? Magnitude and Direction
62. ### Physics

A 83.0-kg person, hanging from a rope, is being pulled away from a burning building by a firefighter, as shown in the figure below.
63. ### 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?
64. ### Physics

A 200kg motorcycle is driving in a circular path at 1 rev per 5 seconds and the circle has r=12m
65. ### physics

a 10,000hg car rounds a curve of radius 1200ft at 50mph what is its centripetal acceleration?
66. ### physics

light from the sun travels 1.5x10km to reach the earth .how long does it journey take in minutes?
67. ### physics

A ball is thrown from a height h and another from 2h.find the ratio of time taken by the two balls to reach the ground.
68. ### 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?
69. ### 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?
70. ### physics

Calculate the time elapsed if the speed of a truck going south is reduced from 80 km/h to 44 km/h in a distance of 250 m.
71. ### 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?
72. ### Physics/ Science

Cars A and B, each moving at 70 km/h, are approaching one another on a straight highway. After how many seconds will they meet if they were initially 1 km apart?
73. ### Physics

why do photoelectrons emitted from a metal surface has energy distribution for an incident radiation of frequency?
74. ### Physics

Two bullets have masses of 4.6 g and 11 g, respectively. Each is fired with a speed of 41.0 m/s. a) What is the kinetic energy of the first bullet? Answer in units of J.
75. ### physics

vector b has x,y, and z components of 4.0, 6.0, and 3.0 units, respectively. Calculate the magnitude of b and the angles that b makes with the coordinate axes.
76. ### physics

An airplane reaches a velocity of 71m/s^2 when it takes off. What must its acceleration be if the runway is 1.0km long
77. ### Physics

Describe the acceleration time graph of a car traveling forward and applying its brakes.
78. ### Physics

A student walks from her apartment a distance d=139m to the bus stop at a speed of v1= 1.40m/s.
79. ### PHYSICS

Calculate the radial acceleration of an object on the ground at the earth's equator in m/s2, turning with the planet.
80. ### physics

Frequency and period are related, in that they are which of the following?A) inverses of each other.B) None of these.C) both on the same wavelength.D) directly proportional to each other.E) two expressions for much the same thing.
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. ### Physics

Explain atomic line spectra in terms of transitions between discrete energy levels.
83. ### Physics

If a car engine has a power,P. Write an expression for the time it will take to accelerate from w to 4w. Note that P=wt where t is torque.
84. ### Physics

a 52kg person riding a bike rotates her wheels in a circle of 17 cm what is her max tourque
85. ### physics

If you throw a ball straight upward at a speed of 11 m/s, How long will it take to return to its starting point?
86. ### PHYSICS

TWO WEIGHTS ARE ATTACHED TO BOTH ENDS OF A WIRE AND SLIDED ON A BLOCK OF ICE.INVESTIGATE THIS PHENOMENON?
87. ### physics

If you throw a ball straight upward at a speed of 11 m/s, How long will it take to return to its starting point?
88. ### physics

in einstein's famous equation e=mc^2, describing the relationship between matter and energy, the units for E are m=====>kg, c=====>m/s a) kg m/s b)kg m/s^2 c) m^2/s^2 d)kg m^2/s^2 I think its either B or D but indecisive...
89. ### physics

How long will it take a 1030 W motor to lift a 330 kg piano to a sixth-story window 13.0 m above?
90. ### Physics

With the energy needed to warm up some amount of water from 40C to 64C, how high could you lift it?
91. ### physics

Sound waves have which of these properties? A) Reflection.B) All of these.C) Refraction.D) Interference.E) Capable of producing beats.
92. ### physics

Doubling the frequency of a wave source doubles the speed of the waves. ( True or False)
93. ### physics

a racing car has a uniform acceleration of 4ms-2. what distances will it cover in 10s after start?
94. ### physics

a rolling ball covers a distance of 650m in 20 min. its speed in kilometer per hour will be what?
95. ### physics

A cylindrical container 1.7 tall contains mercury to a certain depth, . The rest of the cylinder is filled with water
96. ### physics

If a DeLorean rolls gently (vo = 0) off a vertical cliff, how long does it take it to reach a downward velocity of 78 km/h?
97. ### physics

A ball is thrown from a height h and another from 2h.find the ratio of time taken by the two balls to reach the ground.
98. ### physics

3 person are moving triangle place.their velocity are equal. they are follow each other after which time they should meet with each other?
99. ### PHYSICS

If a DeLorean rolls gently (vo = 0) off a vertical cliff, how long does it take it to reach a downward velocity of 78 km/h?
100. ### physics

Frequency and period are related, in that they are which of the following?A) inverses of each other.B) None of these.C) both on the same wavelength.D) directly proportional to each other.E) two expressions for much the same thing.