# Physics!

74,730 results, page 80
1. ## Physics

Determine the stopping distances for a car with an initial speed of 93 km/h & human reaction time of 0.80 s, for an acceleration a=−4.0m/s2.?
2. ## physics

A rock is thrown upward at an angle of 50 degrees with respect to the horizon. As it rises, its vertical component of velocity does what?
3. ## physics 11

a small 900kg sports car can deliver 100Hp to the pavement. how quickly can it reach 30m/s from rest?
4. ## Physics

An unbalanced forced of 2.5x10^3N is applied to an object with a weight of 3.0x10^3N on a frictionless surface. What is the objects acceleration?
5. ## Physics

A pendulum has a mass of 2.7 kg, a length of 1.7 meters, and swings through a (half)arc of 22.7 degrees. What is its amplitude to the nearest centimeter?
6. ## Physics 2

How many grams of steam at 100C must be mixed with 200g of water at 20C in order for the equilibrium temperature to be 50C?
7. ## physics (science)

A body travels from rest with acceleration 8m/s square . Find its velocity when it has covered a distance of 100m
8. ## physics

You are driving north on a highway. Then, without changing speed, you round a curve and drive east. Does your velocity change
9. ## Physics

What gravitational force do yhe two protons in the helium nucleus exert on each other? There separation is approximately 1.0 fm. I know that 1 fm is 10^-15 m i didn't know if that was how you figured it out to get it to N?
10. ## physics

a fan rotates speed of 600rev per min the power is cut it stopped after 60 rev find time
11. ## Physics Help

An electron with velocity v = 2.4 × 106 m/s i encounters an electric field E = 1250 N/C i. How long will it take for the speed to be one fourth its original value?
12. ## physics

a bullet fired into a target loses half its velocity after penetrating 25cm.How much further will it penetrate before coming to rest ?
13. ## Physics

Find the minimum initial speed of a projectile in order for it to reach a height of 2022 km above the surface of the earth.
14. ## physics

consider an electron near the equator. in which direction does it tend to deflect by the magnetic field of the earth if its velocity is directed a.northward
15. ## physics

Given x(t) = xm cos 2ðt/T for a spring with constant k and attached mass m sketch as a function of t, (a) the displacement x, (b) the velocity v, (c) the acceleration.
16. ## Physics

A police cruiser is travelling at 24 m/s and slows down at a rate of 0.65 m/s2 until it stops. The distance traveled by the cop while slowing down is closest to
17. ## Physics help

How fast would you need to be travelling relative to an observer in order for them to see a 15% increase in your mass? How do I rearrange the formula to solve for v m = n/sqrt(1-(v^2)/c^2))
18. ## Physics

This problem is about the work-energy theorem. What is the final speed of the particle? Express your answer in terms of K_f and M.

Explain three ways in wich you can help to adress poverty and aids in s.a
20. ## Physics

Show that 480 W of power is expended by a weightlifter when lifting a 60-kg barbell a vertical distance of 1.2 m in a time interval of 1.5 s.
21. ## Physics

A 16-kg child sits on a 5-kg sled and slides down a 143-meter, 30-degree slope, to the nearest m/s what is his or her speed at the bottom?
22. ## Physics

If you look at yourself in a shiny Christmas tree ball with a diameter of 10.5 cm when your face is 35.0 cm away from it, (a) where is your image? (b) Is it real or virtual? (c) Is it upright or inverted?
23. ## science,physics

The focal length of a mirror is given by 1/f=1/u+1/v where u and v represent object and image distances respectively,The maximum relative error in f is ?
24. ## Physics

If two sound waves undergo complete destructive interference, what must be true? A. They have the same amplitude. B. They have the same frequency. C. They are 180° out of phase. D. all of the above
25. ## Physics

A car requires velocity of 36 km/h in 10sec just after the start . It takes 20sec to stop . Calculate the acceleration in both the cases .
26. ## Physics

A skier is gliding along at 5.0{\rm m/s} on horizontal, frictionless snow. He suddenly starts down a 15{\rm ^{\circ}} incline. His speed at the bottom is 15{\rm m/s} .
27. ## Physics

Ivan rides his motorcycle 4.5 times around a circular track that has a radius of 100 m a)what is the distance traveled and b)what is the displacement?
28. ## physics

the frequency of middle C on a piano is 261.6hz. What is the wavelength of sound as it travels @room air and in water?
29. ## physics repost

A 1.00-kg ball is attached to a string of 0.50 m and swung in a horizontal circle with a velocity of 2.00 m/s. Find the centripetal acceleration. ac=v^2/r = 2.00^2/.50 = 8.0 m/s^2
30. ## physics

If your initial speed was 19 , and you were heading due west, what was your average velocity during braking? Assume constant deceleration
31. ## physics

If a flea can jump straight up to a height of 0.310 m, what is its initial speed as it leaves the ground? How long is it in the air?
32. ## Physics

A bomber is flying at a velocity of 200.0 km/hr with an altitude of 1.5 km. How far (horizontally) from its intended target should the plane drop the bomb?
33. ## Physics

A police cruiser is travelling at 24 m/s and slows down at a rate of 0.65 m/s2 until it stops. The distance traveled by the cop while slowing down is closest to A. 0.44 km. B.0.38 km. C.0.42 km. D.0.36 km. E. 4.0 km.
34. ## science (physics)

a skaterboarder is moving 5.25 m/s when he starts to roll up a frictionless hill. how much higher is he when he comes to a stop? (energy problem)
35. ## Physics

The frequency of an electon orbiting a nyclear is 1000000000 cps and the radius is 5 * 10 to the -12m. Find the velocity of the electron.
36. ## physics little folks

a mass is attached at the spring perform SHM with frequency of 15 hz find the acceleration when displacement is 1.6cm
37. ## physics

what frequency and period would be required for sally and her hard-working partner to produce a standing wave with three nodes?
38. ## Physics

A box with a mass of 10 kg slides along a horizontal surface. A force of 50 N is needed to keep it moving. What is the coefficient of kinetic friction?
39. ## physics

A flower pot with a mass of 3.8kg is hanging by 2 wires that make an angle of 48° from the horizontal. what is the tension in each wire?
40. ## physics

A softball bat is rotating at 460 rotations per minute at contact with the ball. What is the angular velocity in radians?
41. ## Physics

What is the average braking force required of a 1200kg car in order for it to come to rest from 60km/h in a distance of 25m
42. ## physics

Calculate the Coriolis acceleration of an aeroplane flying along the equator due east at a speed of 300m s−1.
43. ## physics

A body moving with a velocity of 3m/s is brought to rest by a constant force after travelling 15m, calculate the retardation.
44. ## college physics

How fast (in rpm) must a centrifuge rotate if a particle 9.50 cm from the axis of rotation is to experience an acceleration of 113000 g's? Need help please.
45. ## PHYSICS

a swimmer develops an average of 200 watts in a distance of 100m in 80 seconds. what is the force resistance in the water?
46. ## physics

Two freight cars, each with a mass of 3.9 105 kg, collide and stick together. One was initially moving at 3.2 m/s and the other was at rest. What is their final speed in m/s?
47. ## physics

A flower pot with a mass of 3.8kg is hanging by 2 wires that make an angle of 48° from the horizontal. what is the tension in each wire
48. ## physics

a circuit consist of an inductance of 0.05H, a resistance of 20ohms , a capacitor of 100uF and an angle of 100cos200t. find (i) and (q) given that q=0,and i=0 at t=0.
49. ## Physics

A 3kg block is resting on a table with a coefficient of friction of 0.4. It is now pushed with a force of 15n. What is the acceleration of the book?
50. ## college physics

Estimate the rotational kinetic energy of Earth, assuming it to be a solid sphere of uniform density.
51. ## Physics

A steel wire, 150 m long at 10°C, has a coefficient of linear expansion of 11 ´ 10-6/C°. Give its change in length as the temperature changes from 10°C to 45°C.
52. ## physics

a hot air ballon is 2.5m high, moving at 2/ms. when someone throws a camera at 13m/s to the baloon. at which height do they meet?
53. ## Physics

A baseball was hit at 45m/s at an angle of 45 degrees above the horizontal. How long did it remain in the air? How far did it travel horizontally?
54. ## physics

A wooden cube of side 10cm has mass 700g.What part of it remains above the water surface while floating?
55. ## physics

What is the acceleration (in meters/second^2) of a freely falling 73.0 kg sky-diver, if air resistance exerts a force of 273 N?
56. ## physics

How far should and object be from a concave sperical mirror of radius 36cm to form a real image one-ninth it's size?
57. ## Physics

Show that 480 W of power is expended by a weightlifter when lifting a 60-kg barbell a vertical distance of 1.2 m in a time interval of 1.5 s.
58. ## Physics

Two planes approach each other head-on. Each has a speed of 765 km/h, and they spot each other when they are initially 11.0 km apart. How much time do the pilots have to take evasive action?
59. ## physics

a ball is thrown from level ground at 24 m/s, 30 degree above horizontal. How much time will it take to reach its maximum height? solution
60. ## Physics

Two bowling balls each have a mass of 6.8kg. the speres are located nest to one another with their centers 21.8 cm apart. what gravitational force do they exert on each other?
61. ## principles of 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 ____________________. A) 0.5 m/s. B) 1 m/s. C) 1.5 m/s D) 2 m/s E) 2.5 m/s.
62. ## physics

a particle completes 4 revolution/sec on a circular path of radius 0.25m.calculate angular velocity
63. ## Physics

It takes you 9.5min to walk with an average velocity of 1m/s to the north from the bus stop to the museum entrance. What is your displacement?
64. ## physics

If the 60-kg player is running forward at 7.0m/s when she makes contact with the dummy, what is the players velocity at the end of the 1.20s impact?
65. ## Physics

Which object has a greater momentum, a stationary tractor-trailer or a tossed tennis ball? Explain your answer please.
66. ## Physics

A large merry-go-round completes one revolution every 17.5 s. Compute the acceleration of a child seated on it, a distance of 5.80 m from its center.
67. ## Physics

if light touching a surface has an intensity of about 1000W/m^2, how many numbers of photons per m^2 per sec does this show? wavelength of P=600nm
68. ## physics

The velocity of a diver just before hitting the water is -8.8 m/s, where the minus sign indicates that her motion is directly downward. What is her displacement during the last 0.93 s of the dive?
69. ## physics

The velocity of a diver just before hitting the water is -8.8 m/s, where the minus sign indicates that her motion is directly downward. What is her displacement during the last 0.93 s of the dive?
70. ## physics

A loaded truck can accelerate at 8.8 m/s 2 . It loses its load so that it is only 0.6 as massive. By what factor must the acceleration change for the same driving force?
71. ## physics

Measuring in foot pounds of toque what pressure can the world’s strongest man exert by pulling on an object?
72. ## Physics

I need help figuring this out. I am asked to write about similarities of two different ways of determining the value of g. One of them is using the slope of the line, and one of them is using the average. Each method used the same L and T values.
73. ## Science - PHYSICS

im having problem understanding what motion equation to use. " A motercycle moving 12 m/s [W] accelerates at 6.0 m/s [W]. How long will it take to experience a displacement of 63 m [w] ? "
74. ## physics

a man walked 32.5m souhward and 78m westward. if it took him 30 minutes to reach his destination.find his average speed?
75. ## Physics

How long will it take a motor with an output power of 4000 W to lift a 250 kg container vertically upwards 25 m? how would u do the calculation?
76. ## physics

A 0.5 kg air-hockey puck is initially at rest. What will its kinetic energy be after a net force of 0.3 N acts on it for a distance of 0.5 m
77. ## physics

a box of treasure with a mass of 92 kg and volume of 0.031metrecubic lies at the bottom of the ocean.how much force is needed to lift it?
78. ## Physics

If a person jumped off the side of a ship from 20 feet high what speed would they be travelling at when they impact the water? Thanks Mike
79. ## Physics

Force acting on conductor when placed in magnetic field from east to west horizontal component is 3.0 and current is 10A
80. ## Physics B

A car slows down from 23 m/s to rest in a distance of 85m. What is its constant acceleration? I got -6.224, but a friend was telling me it's -3.11 and that I had to divide by 2. Why is that?
81. ## Physics

Two ants race across a table 58cm long. One travels at 4.8 cm/s and the other at 3 cm/s. When the first one crosses the finish line, how far behind is the second one? Answer in units of cm
82. ## Physics

An airplane lands and starts down the runway at a southwest velocity of 43 m/s. What constant acceleration allows it to come to a stop in 1.2 km?Answer is in ___ m/s2.
83. ## Physics

A rocket accelerates from rest at 17 m/s2 for 11 s. How far will it cover during this time? Answer in units of m. How do I solve this? do I multiply 17m/s2 by 11 seconds??
84. ## Physics??

A car is traveling at a speed of 62 on a freeway. If its tires have diameter 24.0 and are rolling without sliding or slipping, what is their angular velocity?
85. ## Physics

A soccer player kicks a rock with an initial velocity of 0.50 m/s from a height of 4.0 meters. What is the speed of the ball 0.70 second after it is released? Vi = 0.50 m;s h = 4 m t = 0.70 s
86. ## Physics

A 1200kg car accelreates from 0mph-60mph in 8.5 seconds. Calculate the force needed to accelerate the vehicle.
87. ## physics

Stand on a 200 meter high building and, at noon, drop a ball. At what time does it hit the ground
88. ## Physics

How would you use a concave mirror of radius of convatrue 18cm to give a four time magnified erect image of an object?
89. ## Physics

How would you use a concave mirror of radius of convatrue 18cm to give a four time magnified erect image of an object?
90. ## PHYSICS

What is the acceleration (in meters/second^2) of a freely falling 73.0 kg sky-diver, if air resistance exerts a force of 273 N?
91. ## Physics

A car accelerates uniformly from rest to a speed of 23.9 km/h in 8.2 s. Find the distance it travels during this time. Answer in units of m
92. ## physics

By what length is a light ray displaced after passing through a 4.7 cm thick sheet of material (n=1.38) with an incident angle of theta = 33.5°.
93. ## Physics

Three particles have charges +20μC each.They are fixed at the corners of an equilateral triangle of side 0.5m .The force on each of particle has magnitude
94. ## physics

How long would it take a car that starts from rest and accelerates uniformly in a straight line at 5 m/s 2 to cover a distance of 400 m?
95. ## Physics

Problem 3- If a bug can jump straight up to a height of 0.5 m. a) what is its initial speed as it leaves the ground? b) How long is it in the air?
96. ## Physics

How does Rutherford's model of the atom account for the back-scattering of alpha particles directed at the gold foil?
97. ## Physics

A boy sledding down a hill accelerates at 2.33 m/s2 . If he started from rest, in what distance would he reach a speed of 8.70 m/s? Answer in units of m
98. ## Physics

What is gravitational force of a 65kg person that is on the surface of the moon has a mass of 7.348 x 10^22kg and radius of 1731km?
99. ## physics

By what length is a light ray displaced after passing through a 4.7 cm thick sheet of material (n=1.38) with an incident angle of theta = 33.5°.
100. ## physics

10. How much current is required to produce a force of 0.96 N on a 75 cm long wire oriented at right angles to a 0.24 T magnetic field? A. 0.050 A B. 0.17 A C. 5.3 A D. 0.19 A 5.3 A (<--- (0.96)/((75.0e-2)*(0.24)) )