# Physics!

74,459 results, page 91

1. ### Physics

please help: "george drops a stone from atop a cliff of 25m. How long does it take to hit the ocean below, what velocity is it travelling when it gets there?"
2. ### physics

Acceleration in meters per square second. A car begins at rest at a stop sign, it accelerates 25m/s over a time of 8.6sec
3. ### Physics 1

A football is thrown upward at an 48◦ angle to the horizontal. The acceleration of gravity is 9.8 m/s^2. To throw an 80.4 m pass, what must be the initial speed of the ball? Answer in units of m/s.
4. ### Physics

Find analytically the sum or resultant of the following displacements: A= 10m Northwest , B= 20m 30 degree north of east and C = 35m due Souh
5. ### Physics

What is the magnitude of the electric field at a point midway between a −8.3μC and a +5.4μC charge 10cm apart? Assume no other charges are nearby.
6. ### physics

The position of a particle moving along the x-axis is given by x = (13 + 11t − 1.5t2), where t is in seconds and x is in meters. What is the average velocity during the time interval from t = 1s to t = 4 s?
7. ### Physics

The first leg of a relay race is semi circle of diameter 50m. If the runner covers the distance in 11s.calculate the average speedâ€
8. ### Physics

When an objects acceleration is 0 at an instant t in time, its velocity is 1. zero at t. 2. negative at t. 3. positive at t. 4. not changing at t. My teacher never taught us this, can someone help me figure it out?
9. ### Physics

Steve can paddle his canoe at 10 km/h in still water. If he paddles directly against a river’s current that is moving at 3 km/h, what is Sam’s velocity relative to the shoreline?
10. ### physics

Determine the mass of the flywheel if it is a solid disc and the dimensions are as follows: Outer diameter = 500mm Thickness = 50mm Material density = 7500 kg/m^3
11. ### Physics

Once a favorite playground sport, dodgeball is becoming increasingly popular among adults of all ages who want to stay in shape and who even form organized leagues. Gutball is a less popular variant of dodgeball in which players are allowed to bring their own (typically ...
12. ### English

Hello! I will type 2 exercises from the lesson I am teaching on Wednesday-english as a foreign language - 8th graders ( it will be graded) I need you to help me with some ideas. It says: LEAD- IN: A Here is a list of some natural sciences: BIOLOGY CHEMISTRY PHYSICS BOTANY ...
13. ### Physics

An equipotential surface that surrounds a +2.7 x 10^-7 C point charge has a radius of 0.13 m. What is the potential of this surface?
14. ### PHYSICS

THE TYPICAL RADIO WAVE HAVE A PERIOD OF 1 US EXPRESS THIS PERIOD IN SECONDS
15. ### physics

why are lightweight tires preferred over lightweight frams in bicycle racing?
16. ### Physics RC

how does the circuit potential difference,v, across the capacitor varies with R(resistance)in an RC circuit??
17. ### physics

The,net,force,on,an,object,is,zero.Can,you,conclude,that,the,object,is,at,rest?Explain
18. ### Physics

A satellite is in orbit 2500km above the surface of Earth. What is the velocity of the satellite in m/s?
19. ### Physics

Compare 940 on the AM dial to 94 on the FM dial. Which has the longer wavelength and by what factor is it larger?
20. ### Physics

Why are interference colors more apparant for thin films than for thick films?
21. ### Physics

How could an element emit alpha and beta particles and result in the same element?
22. ### physics repost

Calculate the sound level in decibels of a sound wave that has an intensity of 2.25 µW/m2. F
23. ### PHYSICS

how could an element emit alpha and beta particles and result in the same element?
24. ### physics

when a hot object warms a cooler object, does temperature flow between them
25. ### Physics

In what way are fission and fusion reactions similar? What are the main differences in these reactions?
26. ### Physics

If the distance between massive objects doubles, what happens to the force between them?
27. ### Physics

How do you find the focal length of a concave lens using a convex lens?
28. ### physics

How much does a 600 N spaceship weigh on the moon if the moon's gravity is 33% of Earth's?
29. ### Physics

How could it be possible thaat an object with a density greater than that of water could float on water.
30. ### physics

finding the acceleration of a simple pendulum g= 4pi^2 x length/T^2 T^2= 2.28 length= 70cm
31. ### physics

what can be said about the speed of an object if the net work done on that object is zero?
32. ### Physics

There is a figure q1= 23 uC and q2= 16 uC. The force on q1 points in the -x direction. q1 is at (0,1) q2 is at (2,0) q3 is at (2,2) What is the magnitude of the force on q1? I am doing this (9*10^9)(23*16)(-4ihat)7^3 where did i go wrong?
33. ### Physics

If the rectangular coordinates of a point are given by (4,y), and its polar coordinates are (r,25 degrees), determine y and r.
34. ### Physics

the sun's mass is 1.99*10^30 kg and it has a radius of 6.96*10^8 m.What is the Sun's gravitational field strength at its surface.
35. ### Physics

the sun's mass is 1.99*10^30 kg and it has a radius of 6.96*10^8 m.What is the Sun's gravitational field strength at its surface.
36. ### physics

What is the force between two balloons with negative charge of 2.3 x 10^-12 C if the balloons are 46 cm apart?
37. ### physics

Is it true or false that momentum is conserved when total mechanical energy is conserved?
38. ### Physics

The Moon's period of revolution around the Earth is 27.3 d. How far away is the moon?
39. ### physics

Is it true or false that momentum is conserved when total mechanical energy is conserved?
40. ### physics

The amplitude of an oscillator decreases to 69.0% of its initial value in 15.5s. a) What is the value of the time constant?
41. ### physics

A soccer ball kicked with a force of 13.5 N accelerates at 6.5 m/s2 to theright.What is the mass of the ball
42. ### Physics

Two joules of energy are required to extend a spring by .25 m. What is the spring constant?
43. ### Physics

A single 11 Newton force is applied to an object of mass 19 kg. What is the acceleration of this object in m/s2
44. ### Physics

A object of mass 2 kg experiences an acceleration of 4 m/s2. What is the net force on the mass in Newtons?
45. ### physics

How do you convert from nanometres - metres and vice versa? I need to convert 0.6 X 10-6 (the -6 is an expom to nm...
46. ### physics

A particular machine has "mechanical disadvantage". What is the purpose of using such a machine?
47. ### PHYSICS!!!

If a machine cant multiply the amount of work , what is the advantage of using such a machine?
48. ### PHYSICS!!!

If a machine cant multiply the amount of work , what is the advantage of using such a machine?
49. ### Physics

A particular machine has "mechanical disadvantage". What is the purpose of using such a machine?
50. ### physics

metal ball and rubber ball dropped in the 20 ft building in the same time.
51. ### physics

If you are initially 1.50 km [E] of home and 0.65 hours later you are 0.75 km [N 45 degrees E] of home, what is your change in displacement?
52. ### physics

If you are initially 1.50 km [E] of home and 0.65 hours later you are 0.75 km [N 45 degrees E] of home, what is your change in displacement?
53. ### Physics

How will the weight of a 20kg object change in an elevator if the elevator moves downwards with 4 m.s?
54. ### physics

a 10kg block is allowed to slide down a ramp with Mk=0.15. what is the acceleration of the block?
55. ### physics

What is the wavelength of the radio waves broadcast by an FM radio station with a frequency of 90.5 MHz?
56. ### physics

If we push on a heavy crate to the right and it slidesw, what is the direction of friction on the crate?
57. ### physics

If you shout across a canyon and hear an echo 3.6 s later, how wide is the canyon?
58. ### Physics

How much work (in J) is done to accelerate a car which has a mass of 3300 kg from a speed of 7 m/s to a speed of 16 m/s?
59. ### Physics

Wave amplitude is related to what? (a) wave velocity (b) frequency (c) energy (d) wavelength
60. ### Physics - Momentum

Under what circumstances is the change in momentum of a system equal to zero?
61. ### physics

An object with an initial velocity of 5 m/s accelerates uniformly for 15 s. (a) If the final velocity is 37 m/s, what is the acceleration?
62. ### Physics

What average force is required to stop an 1700 car in 7.0 if the car is traveling at 75 ?
63. ### Physics

What average force is required to stop an 1700 kg car in 7.0 s if the car is traveling at 75 km/h?
64. ### Physics

How do we prove that the displacement for a trip is equal to the sum of the dispalcements for each leg of the trip?
65. ### physics

a basketball player can leap upward 0.5m. what is his initial velocity at the start of the leap?
66. ### physics

A ball is kicked at a 37 degree angle, with a velocity of 14.6 m/s. How high and far does the ball go?
67. ### physics

What average force is required to stop an 1300 -kg car in 9.0 s if the car is traveling at 90 km/h?
68. ### physics

If a stone is thrown vertically up in a moving lorry,where will the stone fall? Explain.
69. ### physics !!

How do I calculate the person of error in Centripetal force if it arises from 1% error of the Radius = 5.4 ?
70. ### Physics

What average force is required to stop an 1600 -kg car in 8.0 s if the car is traveling at 80 km/h?
71. ### physics

A 3.00 kg book is dropped from a height of 2.2 m. The acceleration of gravity is 9.81 m/s2 . a) What is its acceleration? Answer in units of m/s2.
72. ### PHYSICS

The boy on the tower (20 m) throws a ball a distance of 60 m. At what speed, in m/s, is the ball thrown?
73. ### Physics

Help how to find work If a worker pulls a 10kg bucket up a 25 m well, how much work has he or she done?
74. ### physics

a child on a merry go round at 1.5 m is moving ______ times faster than child at .5 m
75. ### physics

a projectile is shot up 25 m/s at an angle of 34 degress how high imto the air does the projectile go?
76. ### Physics

Which of the following is not a unit of power? a)hp b)J c)W d)J/s I answered d. J/s because its measuring speed and not power. I don't know if its correct or not.
77. ### Physics

a book weighs 4 N. When held at rest in your hands, the net force on the book?
78. ### physics

a 0.180 kg ball falls 2.5m. How much work does the force of gravity do on the ball?
79. ### physics

What provides the force when a car makes a turn? (This is dealing with centripetal force)
80. ### physics

in pl spectrum what is the red shift and blue shift and also give the interpretaion
81. ### physics

how can we calculate potential energy if we don't have mass but we have force or newtons?
82. ### Physics

A tiny spring, with a spring constant of 1.20 N/m, will be stretched to what displacement by a 0.005 0-N force?
83. ### physics

Pulling up on a rope, you lift a 4.05-{\rm kg} bucket of water from a well with an acceleration of 2.20 m/s^2. What is the tension in the rope?
84. ### physics

Block A (70 N) and block B (21 N) are connected by a massless cord and are at rest. Given ìs = 0.8. What is friction A ?
85. ### physics

Block A (60 N) and block B (40 N) are connected by a massless cord and are AT REST. Given ìs = 0.8. The friction on A is : 1. 40 N 2. 0 N 3. 24 N 4. 48 N 5. 20 N 6. 60 N 7. 16 N
86. ### Physics

A constant friction force of 10 N acts on a 85 kg skier for 20 s. What is the skier's change in velocity?
87. ### Physics

How much heat must be added to 60 g of ice at 0 C to melt the ice completely?
88. ### physics

A 40 kg rock is accelerating down a hill at 3 m/s2. What is the net force exerted on the rock
89. ### Physics

(c) A force vector with a magnitude of 44 lb that is in the third quadrant with an x component whose magnitude is 38 lb.
90. ### Physics

A +3.0 nC charge is at x=0 cm and a -1.0 nC charge is at x=4 cm. At what point or points on the x-axis is the electric potential zero?
91. ### physics

a 2.5 kg rifle fires a 20 g bullet at 400 m/s. What is the magnitude of the recoil velocity of the rifle?
92. ### physics

a 2.5 kg rifle fires a 20 g bullet at 400 m/s. What is the magnitude of the recoil velocity of the rifle?
93. ### Physics

The force on a 0.80 m wire that is perpendicular to Earth's magnetic field is 0.12 N. What is the current in the wire?
94. ### Physics

an object moves from the position (1,3,-5) to the position (-1,4,8) during time 8 s. what is the average speed?
95. ### Physics

An object moves from the position (1,3,-5) to position (-1,4,8) during time 8 s. what is the average velocity?
96. ### physics

why is distance usually on the bertical axis even if the distance is the independent variable?
97. ### physics

an object is moving so that its kinetic energy is 83.8 J and the magnitude of its momentum is 27 kg m/s what is the speed of the object
98. ### astrology of GEO PHYSICS

3 point 666 point one fifth degree
99. ### physics

when a stone is thrown into the air it's surface will be in contact with the surrounding air
100. ### Physics

An 8.5 x 10^2 elevator is pulled up at a constant velocity of 1 m/s by a 10 kW motor. Calculate the efficiency of the motor.