# Physics!

74,459 results, page 100

1. ### physics

Why we use square root of density in Grahms law instead of simpl density?
2. ### physics

an airplane rolls down the runaway. compared to which reference point is the airplane in motion?
3. ### physics

Forces of 8.85 N and 2.21 N act at right angles on a stack. What is the mass of the stack if it accelerates at a rate of 4.4 m/s^2?
4. ### Physics

A circular ring of radius 10 cm has a continuous charge distribution of 4C/m . How many total electrons are on the ring?
5. ### Physics

Use the equation for acceleration to determine the acceleration for the following motion. Time(s) 0 1 2 3 4 Velocity(m/s) 0 2 4 6 8
6. ### physics

n object is dropped from rest. What is the acceleration after 6 s? The acceleration of gravity is 9.8 m/s 2 . Answer in units of m/
7. ### physics

An electron floats at rest above a sheet of charge with uniform charge density x. What is x in C/m^2
8. ### physics

If my kinetic coefficient and static coefficient are both 1.02, how can I explain why they are the same???? (For a horizontal surface)
9. ### Physics

At 1:00 p.m. a car, traveling at a constant velocity of 80 km/h toward the west, is 31 km to the west of our school.
10. ### Physics

A 0.40 g fruit in a tree has a gravitational potential energy of 200 J. How high from the ground is the fruit?
11. ### physics

A 2.0 kg rock is dropped from the top of a building. I lands 14.0 seconds later. How tall was the building?
12. ### Physics 221

What is the magnitude and direction of the electric field at a point 0.75 m away from a point charge of +2.0 pC?
13. ### physics

two forces 5N and 7N act on an object respectively.When will the resultant of the two vectors be at a maximum?
14. ### Physics

What affect does changing the mass of an object on a ramp have on the efficiency of the ramp? Explain.
15. ### physics

A man walks 10km due south. The displacement of the man from the initial position is
16. ### Physics

A penny is dropped from a 50 m high bridge, how fast was the penny moving when it hit the water?
17. ### Physics

A penny is dropped from a 50 m high bridge, how fast was the penny moving when it hit the water?
18. ### Physics

A car experiences a constant acceleration of 2.3 m/s2. How long does it take (in s) for the car's speed to increase from 6.6 m/s to 17.9 m/s?
19. ### Physics

On an unknown planet, a pendulum of length 1.5 m swings with a period of 3.3 s. What is the acceleration of gravity on this planet?
20. ### physics

he x-component of a velocity vector that has an angle of 44∘ to the +x-axis has a magnitude of 4.3m/s . What is the magnetude velocity?
21. ### Physics

A boat takes 2.0hr {\rm hr} to travel 26km {\rm km} down a river, then 6.0hr {\rm hr} to return.
22. ### Physics

A boat takes 2.0hr {\rm hr} to travel 26km {\rm km} down a river, then 6.0hr {\rm hr} to return.
23. ### Physics 2

An antenna is connected to a car battery. Will the antenna emit electromagnetic radiation? Why or why not? Explain
24. ### physics

The charge carried by one electron is e = -1.6 × 10-19 C. The number of electrons necessary to produce a charge of -1.0 C is:
25. ### physics

A coin is dropped from a height of 40 meters. How fast is the coin traveling after 3 seconds?
26. ### physics

what is the magnetic flux of a magnetic field of 3.5 x 10 T lassing a given circular surface with radius 30 cm
27. ### physics

a ball is dropped from the top on an 80-m high building. what speed does the ball have in falling 3.5 s?
28. ### Physics

What element results if two protons and two neutrons are ejected from a radium nucleus?
29. ### Physics

what will be the final temp of 500g of 21c waterbullets are dropped in? when 500g of 324c lead
30. ### physics

When heat transfers into a system, is the energy stored as heat? Explain briefly.
31. ### physics

In a typical electron microscope, the momentum of each electron is about 1.4 10-22 kg-m/s. What is the de Broglie wavelength of the electrons?
32. ### Physics

A certain planet is located 3.54 x 10^11 m from its sun. If its orbital period is 4.9 x 10^7 s, find the mass of its sun.
33. ### Physics

A certain planet is located 3.54 x 10^11 m from its sun. If its orbital period is 4.9 x 10^7 s, find the mass of its sun.
34. ### Physics

A certain planet is located 3.54 x 10^11 m from its sun. If its orbital period is 4.9 x 10^7 s, find the mass of its sun.
35. ### physics

A steel sphere of radius 6.5 mm is dropped into a lake. What is the terminal speed of the sphere?
36. ### Physics

A steel sphere of radius 6.5 mm is dropped into a lake. What is the terminal speed of the sphere?
37. ### physics

A steel sphere of radius 6.5 mm is dropped into a lake. What is the terminal speed of the sphere?

Multiple choice please help :) Which of the following is equivalent to one ampere? 10 s/10 C 10 C/10 m 1.5 C/1.5 s 15 C/10 s
39. ### Physics

What is the centre of mass if the mass of the earth is 81 times that of the moon and the distance between them is 384 Mm=60 rj ?
40. ### physics

A car with a mass of 2,000 kg has a kinetic energy of 900,000 J. How fast is it traveling?
41. ### physics

An astronaut on Triton throws a 0.142 kg baseball straight up with a velocity of 24 m/s. How high does the baseball go?
42. ### Physics

3) What is the emf of a battery with an internal resistance of 0.15 if the battery delivers 1.5 A to an externally connected 5.0 resistors?
43. ### Physics

why does the temperature of boiling water remain the same as long as the heating and boiling continue?
44. ### Physics 2

State Lenz’s law and explain Briefly explain the operation of an electric generator
45. ### physics

A snail moved 0.14 m between two cabbages in 3.0 minutes. The average speed of the snail is
46. ### physics

how many litres of 15%(mass/volume)sugar solution would it take to get 75g of sugar?
47. ### Sociology

Which of the following was a topic of study in early sociology? a. Astrology b. Economics c. Physics d. History
48. ### Physics

A car slows from 23 m/s to 3.4 m/s at a constant rate of 2.1 m/s2. How many seconds are required before the car is traveling at 3.4 m/s?
49. ### physics

The position of a particle as it moves along the x axis is given by x = 15eƒ{2t m, where t is in s. What is the acceleration of the particle at t = 1.0 s? 4.
50. ### physics

A certain circuit breaker trips when the rms current is 50.0 A. What is the corresponding peak current?
51. ### Physics

An electron has an initial speed of 2.24 × 10^5 m/s. If it undergoes an acceleration of 2.2 × 10^14 m/s^2, how long will it take to reach a speed of 5.37 × 10^5 m/s
52. ### physics

The resistivity of copper is 1.3×10^-9 ohms. What is the length of a wire whose resistance is 0.25 ohms, diameter 10^-8 m.
53. ### physics

If a ball hits a wall going 10 m/s, and bounces off going 7 m/s. What is the coefficient of restitution?
54. ### Physics

Two light bulbs of resistance R1 and R2 (>R1) are connected in a series. Which is brighter? What if they are connected in parallel?
55. ### physics

In 10 seconds a car accelerates 3m/s^2 to 90m/s. How fast was the car going before it accelerated?
56. ### physics

Forces of 8.85 N and 2.21 N act at right angles on a stack. What is the mass of the stack if it accelerates at a rate of 4.4 m/s^2?
57. ### physics

A bicycle tire rotates at 30 radians/s. If the bicyclist travels at 10m/s, what is the diameter of the tire?
58. ### physics

a net force of 72 n is applied to a 48 kg box starting from rest for 8 s. what is the final velocity of the box?
59. ### Physics

Does potential energy equal to kinetic energy within the limits of experimental error?
60. ### Physics

The initial speed of a body is 3.01 m/s. What is its speed after 3.89 s if it accelerates uniformly at 3.63 m/s 2 ? Answer in units of m/s
61. ### physics

a 0.12 kg is sitting on a record with a diameter of 0.30 meters. the record completes one turn on 0.40 seconds
62. ### physics

a 0.12 kg is sitting on a record with a diameter of 0.30 meters. the record completes one turn on 0.40 seconds
63. ### Physics

What is the horizontal component of the force of an object sloped at a 45° angle. pulling with a force of 110N.
64. ### physics

Calculate the potential energy of a 9.00 g bullet traveling 4.00 m above the ground at 50.0 m/s with respect to the ground
65. ### physics

The initial speed of a body is 6.64 m/s. What is its speed after 1.38 s if it accelerates uniformly at 4.7 m/s 2 ? Answer in units of m/s
66. ### physics

a force of 10n cause a spring to extened by 20 mm find? the extension of the spring when 25n is applied
67. ### physics

if the radius from the discus to the axis of rotation is 1.4m, what is the linear velocity of the discus at the time of release?
68. ### Physics~

The moon's gravity is one-sixth that of the earth. What is the period of a 0.25 m long pendulum on the moon?
69. ### physics

5000J of heat is supplied to 10kg of water at 30degrees. What will be the water's final temperature
70. ### Physics

Why do citizens have a responsibility to have some basic understanding of nature's rules?
71. ### mathematics,science,physics,agriculture and geograph.

which work i surpose to do?caus geograph confuse me!
72. ### physics

the brakes of a car provide an acceleration of -5.0 m/s^2 . how long will it take for a car traveling at 20.0 m/s to stop ?
73. ### physics

Suppose that you balance a 5 kg ball on the tip of your finger that has an area of 1 cm2. What is the pressure on your finger?
74. ### physics

A canoe has a velocity of 0.31m/s southeast relative to the earth. The canoe is on a river that is flowing
75. ### Physics

Two forces of 5N and 7N respectively act on an object,When will the resultand of the two vectors be at max?
76. ### physics

A 200-kg rock is being pulled upward with an acceleration of 3 m/s2. The net force on the rock is
77. ### physics

A 2011 kg elevator moves with an upward acceleration of 1.9 m/s2. What is the tension in the cable that supports the elevator?
78. ### physics

what is the electric force exerted on a test charge of 3.86 x 10^-5 C if it is placed in an electric field of magnitude 1.75 x 10^4 N/C ?
79. ### physics

What average force is required to stop a 920kg car in 7.7s if the car is traveling at 83km/h ?
80. ### physics

a pendulum is 0.75 meters long and has a period of 4.17seconds is this pendulum on the earth moon or mars?
81. ### Physics

A car that slows down uniformly from 20 m/s to 5 m/s has an impulse of 30,000 kg m/s. Determine the mass of the car
82. ### Physics

Carl hits a 0.05 kg golf ball giving it a speed of 65 m/s. What impulse does he impact to the ball?
83. ### physics

At what force would a 16k object travelling at 25mph hit a stationery object
84. ### Physics

Carl hits a 0.05 kg golf ball giving it a speed of 65 m/s. What impulse does he impact to the ball?
85. ### Physics

A 65 kg sprinter completes a 100 m race in 9.83 s. Calculate the average kinetic energy of the sprinter.
86. ### Physics

an object falls from a 3m height what is the speed of the object just before it touches the ground?
87. ### Physics

What is the focal length of a lens that has a center of curvature of 18 meters from one of the curves of the lens?
88. ### PHYSICS

Find the mass of water that vaporizes when 4.04 kg of mercury at 210 °C is added to 0.498 kg of water at 81.6 °C.
89. ### PHYSICS

Find the mass of water that vaporizes when 4.04 kg of mercury at 210 °C is added to 0.498 kg of water at 81.6 °C.
90. ### Physics

Vectors A and B are added to produce C, that is A+B=C. If B=-5x+5y and C=2x-3y. Find the unit vector of A, that is find A (in component form).
91. ### physics

a man goes 10m towards north,then 20m towards east then displacement is what
92. ### physics

what acceleration is imported to a football when the player kicked it with a force of 25 N mass of football 0.40kg
93. ### Physics

if the distance and height of a track increase, does the car's accepted velocity and acceleration increase?
94. ### experiment physics

experiment vector and addition. is it necessary to label the first load ? explain
95. ### Physics

A 100 kg load is lowered by means of a cable with a downward acceleration of 5.0 m/s^2. What is the tension in the cable?
96. ### Physics

Leila walks south for 20m and then west for 20m. What is her resultant displacement graphically?
97. ### Physics

A body falls freely from rest for a 6sec find the distance traveled in the last 6sec.
98. ### Physics

A ball is dropped from rest and takes 0.43 s to fall to the floor. At what height was the ball released?
99. ### physics

When a car moves up an incline, does the kinetic energy and potential energy decrease or increase?
100. ### Physics

A ball is tossed straight up into the air with a velocity of 37 m/s. What is its velocity at the top of its flight?