# Physics!

74,459 results, page 92

1. ### physics

What average force is required to stop an 1900 car in 6.0 if the car is traveling at 80 ?
2. ### physics

A sound wave has a frequency of 707 Hz in air and a wavelength of 0.50 m. What is the temperature of the air?
3. ### physics

An inflated basketball has a gauge pressure of 9.0 lb/in^2. What is the actual pressure inside the ball?
4. ### Physics

A car experiences an average acceleration of 5.00 km/hr/s for 3.50 sec. What is the change in velocity of the car?
5. ### physics

A force of 1260 N is needed to accelerate a motorcycle at 4 m/s2. What is the mass f the motorcycle and its rider?
6. ### physics

A system is provided 50 J of heat and work done on the system is 10 J. What is the change in internal energy
7. ### Physics

Why do roller coasters use clothoid loops instead of circular loops?
8. ### Physics

A 110 V, 60 Hz AC line is connected to a 6.55 mH coil. Find the current through the coil.
9. ### Physics

a car travels at 20km/h for 1.5h, at 30km/h for 2.0h, and at 40kmh for 0.75 h. What is the car average velocity
10. ### PHYSICS

Evaluate the following intergal:- çMvdv , with upper limit 'v' and lower limit 'u'
11. ### Physics

A centrifuge spins a suspension at 2500 rpm in a radius of 20 cm. What is the acceleration of the suspension?
12. ### Physics

A 2.0 kg mass swinging at the end of a 0.5 m string is travelling 3.0 m/s. What is the centripetal force on the mass?
13. ### Physics - Converting

Convert each of the following measurements to its equivalent in metres. A. 1.1cm B. 76.2 pm I don't get how to convert :\
14. ### Physics

A Styrofoam ball of radius 60 cm falls with a terminal velocity of 8.65 m/s. What is the mass of the ball?
15. ### physics

The successive dis- placements are 5.7 m to the north, 6.3 m 45  north of east, and 9.3 m 50 west of south.
16. ### physics

It takes 5.50 J of work to stretch a spring 5.90 cm from its unstressed length. What is the spring constant k in N/m?
17. ### physics

It takes 9.10 J of work to stretch a spring 5.10 cm from its unstressed length. What is the spring constant k in N/m?
18. ### physics

The speed of sound in air at 20 degrees C is 343m/s. This corresponds to a speed of ____mi/hr.
19. ### physics

What happens to the size of a hole in a metal plate when the plate is heated / cooled
20. ### physics

What happens to the size of a hole in a metal plate when the plate is heated / cooled

If a mass lies on an incline, what is the reaction force to the weight of the mass?
22. ### Physics

A boy has a mass of 45 kg and is running with a velocity of 8 m/s. Find the boy's kinetic energy.
23. ### physics

Brad tosses a rock straight up at 38.4 m/s. What is the rock's velocity after 2.0 seconds?
24. ### physics

An object is located 87.6 cm from a concave mirror that has a focal length of 17.0 cm. Where is the image located?
25. ### Physics

the coefficient of friction between a 78 kg box and a warehouse floor is .21. what is the friction force?
26. ### Physics

What is the fundamental frequency for a 62 cm banjo string if the speed of waves on the string is 470 m/s?
27. ### physics

a force of 20 n is applied to a 10 kg mass on a level frictionless surface what is the acceleration of the mass?
28. ### Physics

Suppose A=3i-2j+k, B=-i-4j+3k&C is a vector lying along x-axis with the property that A.(B+C)=0. Then find vector C.
29. ### Physics

A rocket expels gases at a rate of 1.30 x 10^3 kg/s with a speed of 3.00 x 10^4 m/s. What is the force exerted on the rocket?
30. ### physics

A constant friction force of 15 N acts on a 70 kg skier for 20 s. What is the skier's change in velocity?
31. ### physics

Which of these two is faster-a plane traveling at 250km/hr and a cat running at 250km/hr
32. ### physics

a comet experiences a uniforn acceleration from 60m/s to 183m/s what is the rate of acceleration?
33. ### physics

Mr.FIsher can kick a 2 kg football upwards at 20m/s, how high does the football travel?
34. ### physics

A capacitor that is connected to a 70.0 V source contains 105.0 µC of charge. What is the capacitor's capacitance?
35. ### Physics

How much energy is need to raise 50 kg of warm water from 45 celcius to 80 celcius?
36. ### Physics

Charges of -10.8 nC and -24.2 nC are separated by 0.813 m. What is the potential midway between the two charges?
37. ### Physics

A parallel plate capacitor has a capacitance of 1.71 nF. There is a charge of 0.809 μC on each plate.
38. ### Physics

What is the acceleration of an 0.4m aluminum cube with a density of 2.72 in a beaker of methanol, which has a density of .791?
39. ### physics

e relative to the ground. The airplane’s speed relative to the air is 77.9 km/h. Answer in units of km/h
40. ### physics

The car has a mass of 1200kg Calculate the kinetic of the car when it travels at a speed of 12 m/s.
41. ### Physics

A 0.168kg hockey puck slides at 11.4m/s. what is the work needed to stop the puck?
42. ### Physics - grade 11

The speed of light of a plastic is 1.4x10^8. What is the index of refraction in the plastic?
43. ### physics

You walk 50 m to the north, then turn 60° to your right and walk another 45 m. How far are you from where you originally started?
44. ### physics

You walk 50 m to the north, then turn 60° to your right and walk another 45 m. How far are you from where you originally started?
45. ### PHYSICS HELP!!!!!!!

You walk 50 m to the north, then turn 60° to your right and walk another 45 m. How far are you from where you originally started?
46. ### physics

Suppose the water waves have a velocity of 1.2m/s and wavelength of 2.4m What is the frequency of the waves?
47. ### physics

An electromagnetic wave in a vacuum has a magnetic field with a magnitude of 1.7 x 10^-6 T. What is the intensity S of the wave?
48. ### physics

If you shout across a canyon and hear the echo 0.42 s later, how wide is the canyon?
49. ### Physics

If the two input voltages to a 2-input summing amplifier are +2 V and +5 V, what is the output voltage?
50. ### Physics

If the critical frequency of a low-pass filter is 5 kHz, what is the filter bandwidth?
51. ### Physics

If you can see the face of a friend who is underwater, can she also see you? Please explain. Thanks :)
52. ### physics

If the critical angle of a liquid is 41.4 degrees find the index of refraction for that liquid
53. ### physics

if a person is pushing a cart with a force of 40 Newtons and it accelerates at 0.5 m/s2 , what is the mass of the cart ?
54. ### physics

When an electron jumps from the 4th orbit to the 2nd orbit which series line does it get?
55. ### Physics

A car is initially traveling at 20 m/s when it accelerates to 35 m/s in a time of 5 seconds. What is the acceleration of the car in m/s^2?
56. ### Physics

What is the fundamental frequency for a 58 cm banjo string if the speed of waves on the string is 450 m/s?
57. ### Physics

A spring vibrates at 8Hz,when a mass of 0.82kg is hung from it.What is the spring constant?
58. ### physics

What is the fundamental frequency for a 60 cm banjo string if the speed of waves on the string is 480 m/s?
59. ### Physics

At a certain distance from the center of the Earth, a 4.00-kg object has a weight of 1.95 N. Calculate this distance.
60. ### physics 1

a car is being pulled out of the mud by two two ropes
61. ### PHYSICS

SILICON DENSITY 1.05G/CM3 1MTR x 1MTR x4MM HEIGHT
62. ### physics

How much work can a 22 kW car engine do in 60 seconds if It is 30% efficient It is 100% efficient
63. ### physics

An 21.0 , 12.0 , and 5.0 resistor are connected in series with an emf source. The current in the 12.0 resistor is measured to be 4.00 A.
64. ### physics

A plane traveling at 260m/s has a speed of Match 0.80. What is the speed of sound in the air
65. ### physics

Give an example of an object that moves in a direction opposite the direction of its acceleration
66. ### Physics

Give an example of an object that moves with constant acceleration and constant speed.
67. ### physics

A lead ball has a volume of 94.3 cm3 at 19.3°C. What is the change in volume when its temperature changes to 34.3°C?
68. ### Physics

A lead ball has a volume of 94.3 cm3 at 19.3°C. What is the change in volume when its temperature changes to 34.3°C?
69. ### Physics Diploma Q?

a photon drops from -22 eV to a ground state of -89.2 eV. the frequency the photon emits is? [1.62]
70. ### Physics

which do you prefer to use, an instrument which is more precise or one which is more accurate? WHY? thanks po! :)
71. ### physics

Find the tension T2 of the box hanging from the rope if 1 = 25°, 2 = 65°, T1 = 60.58 newtons, and W = 143.4 newtons
72. ### Physics

vertically up at 28m/sec, gravity 9.8 meters/sec^2 = what is max. height
73. ### Physics

Add (9.3x10^3) + (9.3x10^4) + (0.011x10^6) using correct significant figures?
74. ### Physics

An arrow is shot horizontally from a cliff at 15 m/s land 30 m away. How high is the cliff?
75. ### Physics

An arrow is shot horizontally from a cliff at 15 m/s land 30 m away. How high is the cliff?
76. ### physics

If an 8N force is applied to a wall for 2 minutes and the wall does not move, how much work is done?
77. ### physics

list the contact and non contact forces in mathematics. What is the cold welding?
78. ### physics

from equation t equal to root x+3 find velocity and acceleration t equal to 1second
79. ### physics

from equation t equal to root x+3 find velocity and acceleration t equal to 1second
80. ### physics

Why should we add a the value 273 to change a celcius value in to kelvin.?
81. ### physics

A ball is dropped from a height of 18.6 m. What is the velocity of the ball the instant it hits the ground?
82. ### physics

How do I find the acceleration on a velocity time graph when the graph has an irregular shape.
83. ### physics

A football is kicked 66.6 meters. If the ball is in the air 5.39 s, with what initial velocity was it kicked?
84. ### Physics

How many calories will take to convert 5 grams of 90C degree water to 0 C degree?
85. ### physics

If Joe weighs 100N on the moon how much will Joe weigh on earth? N & kg
86. ### physics

What is the magnitude of displacement for a person that walks 6.0-km North-East, 4.0-km East, and 6.0-km South?
87. ### physics

What is the magnitude of displacement for a person that walks 6.0-km North-East, 4.0-km East, and 6.0-km South?
88. ### physics

A soccer ball kicked with a force of 14.8 N accelerates at 6 m/s2 to the right. What is the mass of the ball?
89. ### physics

an object accelerates at 0.8m/s2 when a resultant force of 200n is acting on it what is the mass of the object
90. ### physics

what is acceleration of an object over a 4second period if its starting velocity is 8 m/s and it velocity is 20 m/s?
91. ### Physics

a spring with a spring constant k= 1340 N/m is oriented find the rate of compression
92. ### physics

The pendulum on a cuckoo clock is 5.00 cm long. (a) Determine the period of this pendulum. (b) What is its frequency?
93. ### Physics

What is the equivalent resistance of two resistors of 2 ohm and 3 ohm connected in parallel?
94. ### physics

find the magnitude of vector by scalar and vector A= ? + 4j +4k B= ? + 2j + 3k if the angle between them 15 degrees.
95. ### physics

The index of refraction of a certain type of glass is 1.58 what is the speed of light in the glass ?
96. ### physics

It takes 2.5 J of energy to stretch a helical spring by 15 cm. Determine the spring constant.
97. ### physics

Haloke does 179 J of work lifting himself 0.296 m. What is Haloke's mass?
98. ### physics

A car is moving at 37 m/s. It slams on its brakes and comes to a stop in 22 m. What was the acceleration from the brakes?
99. ### Physics

An arrow was shot vertically upward at a velocity of 50.0 m/s. What was its velocity after 2.00 seconds?
100. ### Physics

What force is needed to give a 0.25-kg arrow an acceleration of 196 m/s2? A. 0.25 N B. 49 N C. 196 N D. 748 N