# Physics!

74,459 results, page 47

1. ### physics

How do we compensate for thermal expansion /contraction in the construction of metal pipes for carrying steam?
2. ### physics

Name Two solid materials having very low linear expansivity ?
3. ### physics

A liquid expands on heating. Explain briefly how its density will change with rise in temperature
4. ### physics

Name Two solid materials having very low linear expansivity ?
5. ### physics

A liquid expands on heating. Explain briefly how its density will change with rise in temperature
6. ### physics

a rock was thrown at the height of 50.0 m above the ground with an initial velocity of 20.0 m/s straight upward.
7. ### physics

A women walks 2m in the direction 60degrees north of east. find her final displacement.
8. ### physics

A women walks 2m in the direction 60degrees north of east. find her final displacement.
9. ### physics

A car starts from rest and accelerates for 6.7 s with an acceleration of 1.6 m/s2 . How far does it travel? Answer in units of m
10. ### Physics

From the position vs time graph of an object moving with constant acceleration, how could you find the velocity
11. ### physics

A ball is thrown straight up with an intial velocity of 85 ft/s. At what times will it have a height of 200 ft?
12. ### 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
13. ### Physics

What is the acceleration experienced by the tip of the 1.5 cm-long sweep second hand on your wrist watch?
14. ### physics

A 3.00 kg rock is dropped from a bridge and strikes the water below with a velocity of 40.0 m/s. What is the momentum at impact?
15. ### physics

How far (in meters) must a 800 kg pile driver fall, if it is to do 18000 J of work?
16. ### physics

How much work in joules must be done to stop a 5000 kg car traveling at 120 km/hr?
17. ### PHYSICS HELP

what is the minimum amount of energy required to accelerate horizontally a 3.0g bullet from rest to a speed of 40.0 m/s?
18. ### Physics

A woman drops a basketball, how far does it fall in one second? use formulas
19. ### physics

what is the power of a 6 ohm bulb when 3 of such bulbs ar econnected in a 12 volt parallel circuit?
20. ### Physics

What is the resonant frequency in an RLC circuit if R=5 , C=6, and L=12 mH, and V-115 V? (a) 593 (b) 41,400 (c) 1560 (d) 1793
21. ### 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.
22. ### physics

A drag racer accelerated from 0 to 475km/h in 4.88 s. Assuming a constant acceleration, how far did it travel?
23. ### physics

A 8.20 cm tall object is placed 30.0 cm in front of a concave mirror with a focal length of 4.20 cm. What is the magnification?
24. ### physics.pls help

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

What is the speed of a transverse wave in a rope of length 1.50 m and mass 69.0 g under a tension of 500 N?
26. ### Physics

A car slows to a stop over a certain distance. What could cause the stopping force to be greater?
27. ### Physics

What exerts the force obn a rocket in outer space to make it move forward?
28. ### physics

What is the acceleration experienced by the tip of the 1.5 cm long sweep second hand on your wrist watch
29. ### physics

a car accelerates along a straight road from the rest to 90 km/h in 5 s what is the magnitude of its average acceleration
30. ### Physics

Air in a balloon does 25 J of work while absorbing 81 J of heat. What is the change in internal energy?
31. ### physics

how long does a car with an acceleration of 2.0 m/s^2 take to go from 10m/s to 30m/s?and show the solution how do you get the answer.
32. ### physics

A 2.40- bullet embeds itself in a 1.20- block, which is attached to a spring of force constant 770 .
33. ### physics

A family drives 400 milles in 8 hours. Explain how the acceleration of their car changed?
34. ### physics

A family drives 400 milles in 8 hours. Explain how the acceleration of their car changed?
35. ### Physics

How much energy is stored in the 120 uf capacitor of a defibrillator if the potential across the plates is 4 x 10^3 V?
36. ### physics

if a 40.0-g stone is whirled horizontally on the end of a 0.60-mstring at a speed of 22m/s what is the tension in the string?
37. ### Physics

How much heat energy is required to convert 0.1000kg of ice at -10.0 C into water at 50 C?
38. ### Physics

A dynamics cart m1 attached to has a hanging mass m2 m1 = 0.20 kg, and m2 = 1.3 kg. The magnitude of the acceleration of this system will be what approximately?
39. ### physics

a plane is flying at 250 km hr an hit a 50 km hr headwind what is its resultantt speed relative to the ground
40. ### physics

what is your final velocity after 680 meters if you start out at 90km/hr and acceleration is 9 m/s
41. ### physics

how do you find time when all you're given are two different speeds the height and the angle?
42. ### physics

if you exert a force of 500N to walk 4M up a flight of stairs in 4S , how much power do you use?
43. ### physics

find the altitude change of a 10000-kg fighter which clims and in so doing, loses 100 m/s of airspeed
44. ### physics

Calculate the speed (in m/s) of a skateboarder who accelerates from rest for 4 seconds down a ramp at an acceleration of 3 m/s2.
45. ### mathematical method of physics

expand 3sin(4x)+4cos(10x) in to functional series of e(exp)ix
46. ### physics

How much work is needed to stop a 20g bullet moving with speed of 150m/s
47. ### physics

In the figure below, qA = 6.0 µC, qB = 2.6 µC, qC = 1.3 µC, dAB = 4.00 cm, and dAC = 3.00 cm. Determine the magnitude and direction of the net force on qA
48. ### physics

What will be the magnitude of work if a force of 25N pulls a stone through distance of 5m in its direction ?
49. ### physics

A jet travels at 434 m/s. How long does it take to travel 294 m? Answer in units of s
50. ### physics

find the apparent weight of a 18 cm by 12 cm by 6 cm block of concrete with a mass of 1.82 kg that is submerged under water.
51. ### physics

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

A boy hops on his bike and rides 135 meters in 20 seconds. What is his average speed?
53. ### physics

A boy hops on his bike and rides 135 meters in 20 seconds. What is his average speed?
54. ### physics

Find the constant acceleration of a particle whose velocity changes by 3.06 m/s every 0.093 s.
55. ### physics

a pendulum with a length of .600 m has a period of 1.55 s. what is acceleration due to gravity at the pendulums location
56. ### physics

what net force is needed to accelerate a 2.0kg mass from rest to a velocity of 10m/s in 5.0s
57. ### physics

Describe in detail an experiment to find out the half life of a radioactive material
58. ### Physics

How long does it take light traveling from the sun at 3.0 x 10^8 m/s to reach Jupiter, which is 780 x 10^6 km away?
59. ### physics

what force is necessary to stop a 20 g bullet moving at 200 m/s as it penetrates a wood at a distance of 4 m?
60. ### Physics

A nurse counts 76 heartbeats in one minute. What are the period and frequency of the heart's oscillations?
61. ### Physics

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

How long does it take a motor cyclist to come to rest?which travels at 12m/s decelerates at 3m/s^2
63. ### physics

This isn't so much a question, but a query: What does this mean? K.E. = 1/2 mv2 I can do the homework on my own if someone lets me know. Thanks.
64. ### physics

what is the greatest acceleration can be generated by a runner if coefficient of friction between shoes and road is 0.95
65. ### physics

Calculate the watts of power expended when a force of 1.8 N moves a book 2.0 m in a time interval of 1.0 M/S
66. ### PHYSICS

a 1500kg sports car accelerates from 0 to 30 m/s in 8 seconds. Whaat is the power of its engine? Please help
67. ### Physics

Under what conditions would an applied force increase the Kinetic energy of an object?
68. ### physics

explain why a child on a swing comes to rest directly below the top of the swinng
69. ### Physics

If a shoe is dropped from a height of 40m, what is its speed after falling for two seconds?
70. ### Physics

Calculate the gravitational force between two identical 100-kg masses separated by 1 m.
71. ### physics

how much force can be applied to the top block without the blocks slipping apart
72. ### physics

how much force can be applied to the top block without the blocks slipping apart
73. ### physics

I am moving 3 blocks with a force of 3 newtons over a distance of 1 meter in 10 seconds. What is the power?
74. ### Physics

Using volume of a sphere, calculate the average density of Saturn (radius = 60,268 km).
75. ### physics

How far does a point on the circumference travel if the wheel is rotated through an angle of 26.2 rev?
76. ### Physics

Why do we see more mirages in southern states and in the summer than at other times or places
77. ### physics

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

Roads seldom go straight up a mountain, they wind back and forth. Explain why this is useful
79. ### Physics

What is the instantaneous speed 3 seconds into the journey of a car traveling at a constant velocity of 10 m/ s?
80. ### Physics

Find the velocity of microwaves having wavelength of 0.75m and frequency 2.75X10^10hz
81. ### physics

Your friend of mass 80 kg can just barely float in freshwater.Calculate her approximate volume.
82. ### Physics

A Brass rod 50.0 cm long expands 0.0734 cm when heated. Find the temperature change.
83. ### physics

What is the density of nitrogen gas (molecular mass = 28 u) at a pressure of 1.2 atmospheres and a temperature of 284 K?
84. ### Physics

Why is it that interference effects don't show up regularly in glass window panes with two surfaces?
85. ### physics ! HELP PLEASE !!!!1

what are the methods of computing the veolicty of a particle in one- dimensona motion from a graph ?
86. ### physics

What is the minimum work in joules needed to push a 1540 kg car 44.0 m up a 12.5 degree incline?
87. ### physics

a projectile is fired at an angle of 60 degrees with the horizontal and with the initital velocity of 80 m/s. What is the time of flight?
88. ### physics - help !!!!!!!!

The magnitude of a vector is always : - a positive number - greater than 1 - an integer - none of the above. Thank you
89. ### physics

The magnitude of a vector is always : - a positive number - greater than 1 - an integer - none of the above.
90. ### physics

Calculate the internal energy of 25.0 g of low-density oxygen gas (O2) at a temperature of 255 K.
91. ### physics

define black body, emissivity, solar constant in relation to heat transfer.
92. ### Physics

If a car delivers 76.2 hp of power, how much time will it take for the engine to do 5.78e5 J of work?
93. ### 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)
94. ### physics

a gun shoots a potato from a height of 6 feet. how long does it take to hit the ground.
95. ### 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
96. ### 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
97. ### physics

what force must the woman in Figure 3.38 exert on the floor with her hands in order to do a pushup?
98. ### 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?
99. ### Physics

A 70 g ball moves 45m/s. If its speed is measured to an accuracy of 0.10% what is the minimum uncertainty in its position?
100. ### PHYSICS

A car speeds up at 5m/s if the driver was already moving at 7m/s find his velocity after 3 seconds