# Math/Physics

214,413 results, page 84

1. ### physics

is it possible to change both the pressure and the volume of an ideal gas without changing the average kinetic energy of the molecules?
2. ### 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
3. ### Physics

Compute the derivative of the given function and find the slope of the line that is tangent to its graph for the specified value f the independent variable. f(x) = 9x^2 – 2x + 8; x =3.
4. ### physics

A 3 meter tall 40 degree inclined plane with a coefficient of friction of .3 with a box sliding from its top has this acceleration and final velocity.
5. ### physics

two pint charges are 4 cm apart. They are moved to a new distance of 2 cm. By what factor does the resulting mutual forces between them change. a. 1/2 b. 2 c. 1/4 d. 4
6. ### physics

What is the acceleration of the system if both blocks have a mass of 5.0 kg, and the coefficient of kinetic friction is 0.11? [___/4] (b) Determine the tension in the rope.
7. ### physics

Calculate the magnetic field at the center of a wire square that consists of 120 loops and has sides of length 5 cm and carries a current of 0.7 A.
8. ### Physics

How far from the center of the earth must a person be located in space so t hat his/her weight would be the same as when he/she is standing on the moon?
9. ### physics

two charged objects carry a negative charge of 2*10c. calculate their distance apart if the force between them is 10n
10. ### physics

Two point charges 1.5 cm apart have an electric potential energy -150 mu J. The total charge is 34 nC. what are q_1 and q_2?
11. ### Physics

Two objects attract each other gravitationally with a force of 2.1×10−10 N when they are 0.21 M apart. Their total mass is 4.00 KG Find their individual masses. .
12. ### physics

an electric field of 640 v/m is desired between two metal plats 11.0 mm apart. how large a voltage should be applied?
13. ### Physics

How much work (in J) must be done to lift a stack of bricks, which has a mass of 600 kg, from the ground to a height of 15 m? Acceleration due to gravity is 10 m/s2
14. ### physics

I have a Pressure in atm and a volume in liters how do i find the temperature in kelvins?? I know the formula pv=nRT works...but i don't know the number of moles so... I don't know what to do.
15. ### Physics

Calculate how far and apart two indentical charges of 1.0 C must be in order for the Coulomb force between them be less than 500 N
16. ### 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
17. ### Physics

Electrons are ejected from a photoelectric cell with a maximum kinetic energy of 1.20 eV. If the incident light has a wavelength of 410nm, what is the work funtion?
18. ### Physics

How much work does the electric field do in moving a -7.7 micro Coulomb charge from ground to a point whose potential is +55 V higher?
19. ### Physics

How far to the nearest tenth of a meter can a runner running at 11 m/s run in the time it takes a rock to fall from rest 90 meters?
20. ### Physics

"At what point between two masses of 20kg and 15kg located 1.0m apart, will the gravitational field strength equal zero?"
21. ### Physics

A pendulum has a mass of 3-kg, a length of 3 meters and swings through a (half)arc of .47 radians. To the tenth of a Joule, what is its Total Energy?
22. ### physics

How do the pressure variations with depth affect our ability to explore the ocean? Consider the challenges of scuba diving and submarines.
23. ### physics

A box is pushed without acceleration 9.0m along a horizontal floor against a frictional force of 100N. How much work is done?
24. ### physics

An electric field of 630 V/m is desired between two parallel plates 15.9 mm apart. How large a voltage should be applied?
25. ### physics

what is the shortest possible time in which a bacterium could drift at a constant speed of 3.5mm/s across a petri dish with a diameter of 8.4cm
26. ### physics

A man whose mass is 75kg walks up a flight of 12 steps each 20 cm high in 5 seconds . Find the power he develops in watts
27. ### physics

A bullet is shot straight down at a speed of 3.9 m/s. After 2.3 seconds, how fast is it moving? Use 10 m/s2 for gravity. Give answer in m/s.
28. ### physics

three point charges are located at the corners of a right triangle where q1=q3= 5uC,Q2= -2uC and r =10cm.(angle q1 q2q3=90 and q1q3=r)
29. ### physics

three point charges are located at the corners of a right triangle where q1=q3= 5uC,Q2= -2uC and r =10cm.(angle q1 q2q3=90 and q1q3=r)
30. ### physics

please HELP!!! What is the magnitude of the momentum of a baseball (m = 1.450 kg) traveling at a speed of 102 mi/h? Express your answer in SI units. I am unsure where to start
31. ### physics

Between which two orbits of the Bohr hydrogen atom must an electron fall to produce light of wavelength 434.2 ?
32. ### Physics

Estimate the work you do to mow a lawn 14m by 23m with a 0.5m-wide mower. Assume you push with a force of about 15N.
33. ### Physics

Estimate the work you do to mow a lawn 14m by 23m with a 0.5m-wide mower. Assume you push with a force of about 15N.
34. ### physics

what force is being applied to a meteor with a mass of 500 kg as it travels at a constant velocity of 5000 meters per second?
35. ### physics

what kind of information is indicted by a graph of the acceleration due to gravity versus ball's mass if the slope of the curve is zero?
36. ### physics

How long does it take for the ball to hit the ground 7 meters below if it's thrown straight up wit intial velocity of 2 m/s squared?
37. ### Physics

A plane travels with a uniform velocity of 3.399x10^1 m/s for a period of 2.267x10^0 seconds. What distance is travelled during this time, in meters
38. ### physics

For my question about the carton's speed must I do each step you laid out or just the last one? I got the wrong answer. Thanks for your help.
39. ### Physics

In the rope climb, a 68 athlete climbs a vertical distance of 9.0 in 13 . What minimum power output was used to accomplish this feat? In Watts
40. ### Physics

In the rope climb, a 68 kg athlete climbs a vertical distance of 9.0 m in 13 s. What minimum power output was used to accomplish this feat? In Watts
41. ### Physics

A weight lifter cleans and jerks 150kg, lifting it 2m above the ground in 1.5s. What is his power output? How do you set this problem up i know the units?
42. ### Physics

What force is required to accelerate an object of 1.484x10^0 kg over a frictionless surface at -2.3580x10^0 m/s2 expressed to three significant figures.
43. ### physics

How long does it take a plane, traveling at a speed of 170 m/s, to fly once around a circle whose radius is 2900 m?
44. ### physics:energy

How much power is needed to push a box (mass 27 kg) over a surface (coefficient of friction μk=0.5) with a velocity of 1.1 m/s?
45. ### Physics

How fast must a 138 g baseball travel in order to have a de Broglie wavelength that is equal to that of an x-ray photon with A = 100. pm?
46. ### physics

What is the magnitude of the apparent weight of a 69 kg astronaut 5200 km from the center of the Earth's Moon in a space vehicle moving at constant velocity?
47. ### Physics

A flywheel has a moment of inertia of 2.6 kg·m2. What is the average power needed to spin it up from rest to an angular velocity of 100 rad/s in 30 seconds?
48. ### physics

A 4kg box starts up a 30 degree incline with 128J of kinetic energy. How far will it slide up the plane if the co-efficient of friction is 0.3?
49. ### physics

A 4kg box starts up a 30 degree incline with 128J of kinetic energy. How far will it slide up the plane if the co-efficient of friction is 0.3?
50. ### Physics

A rock climber part way up a cliff face drops a piton and it falls for 2.0 s before hitting the ground. How high up is he?
51. ### PHYSICS ---HELP!

A man doing push-ups pauses. His mass is 80-kg. Determine the normal force exerted by the floor on each hand and on each foot. a = 40 cm b = 95 cm c = 30 cm W = mg = 784 N
52. ### PHYSICS ---HELP!

A man doing push-ups pauses. His mass is 80-kg. Determine the normal force exerted by the floor on each hand and on each foot. a = 40 cm b = 95 cm c = 30 cm W = mg = 784 N
53. ### Physics

A skydiver has a terminal velocity of 9.0 m/s. If they have a mass of 98, what is their k value for their air resistance? Use g = 10 m/s/s and do not report units on your answer, they should be N s/m.
54. ### Physics

Calculate the radial acceleration of an object at the equator of Jupiter (which takes 0.410 day to spin once), turning with the planet. (in )
55. ### physics

What is the magnitude of the apparent weight of a 79 astronaut 5200 from the center of the Earth's Moon in a space vehicle moving at constant velocity?
56. ### physics

Using Kepler's constant (9.84 X 10^-14), calculate the orbital radius of an artificial satellite whose period of revolution around the Earth is 1.43 X 10^4s(3.64 h).
57. ### physics

A car's maximum acceleration on a dry road is 10 m/s2. What speed should it have to be able to make a turn with a radius of 47 meters?
58. ### physics

A car's maximum acceleration on a dry road is 10 m/s2. What speed should it have to be able to make a turn with a radius of 47 meters?
59. ### physics

A dinner plate drops and breaks. This best illustrates the ______ law of THERMODYNAMICS A. 1st b. 2nd c. 3rd d. 4th
60. ### physics

A ball is thrown straight up with an initial speed of 60 m/s. How high does it go? Assume the accelera- tion of gravity is 10 m/s22 2)How long is it in the air?
61. ### physics

An automobile manufacturer claims that its product will travel 1.2 km in 27 s, starting from rest. What is the magnitude of the constant ac- celeration required to do this? Answer in units of m/s2.
62. ### physics

Q 2) A particle executes simple harmonic motion with an amplitude of 10 cm. At what distance from the mean position are the kinetic and potential energies equal ?
63. ### physics

two charges +1.2*10^-8 C and -1.6*10^-8 C are placed at the corners A and B of a right angled triangle ABC in which AB=3cm, AC=5cm. find the electric field at C.
64. ### physics

What are the magnitude and direction of the electric field at a point midway between a -7.0 µC and a +6.0 µC charge 2.5 cm apart? Assume no other charges are nearby.
65. ### Physics: Fluids

A sample of an unknown material weighs 260 N in air and 175 N when immersed in alcohol of specific gravity 0.700.
66. ### PHYSICS: Waves in Media

An organ pipe is open at one end and has a length of 3 m. What is its fundamental frequency if the speed of sound is 336 m/s?
67. ### physics

The coefficient of kinetic friction for a 22 kg bobsled on a track is 0.20. What force is required to push it down a 6.0° incline and achieve a speed of 70 km/h at the end of 75 m?
68. ### Physics

What is the difference in blood pressure (mm-Hg) between the top of the head and bottom of the feet of a 1.008 m-tall person standing vertically?
69. ### AP Physics B

An object of mass 3.2 kg is allowed to fall from rest under the force of gravity for 3.5 s. What is the change in its momentum? Ignore air resistance.
70. ### Physics

Determine the initial acceleration of a 1 kg solid aluminum chunk (density = 2,700 kg/m3) released from rest by a diver 10 m under the ocean.
71. ### physics

An object sits 29m above the ground and has a mass of 47 kg. How much potential Energy does it posses 1.5 seconds after falling?
72. ### physics

calculate the horizontal force that must be applied to produce an acceleration of 1 g for 1 kg. puck on a horizantal frictiom-free air table.
73. ### 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?
74. ### Physics

Carbon dioxide forms into a solid (dry ice) at approximately -157°F. What temperature in degrees Celsius does this correspond to?
75. ### Physics

1. A 2,000 kilogram truck traveling at 60km/h strikes a tree and stops in 0.75 seconds. How large is the force that causes this to occur?
76. ### Physics

How much work is done by a boy weighing 450. Newtons while carrying a 20.0 kilogram package up a 2.00 meter flight of stairs?

one kilogram is poured into a cylandrical vase and fills it to a depth of 8 cm. find the cross section of the cylander. how do i do this?
78. ### Physics

A projectile is fired straight up at a speed of 16 m/s. How long does it take to reach the top of its motion? The acceleration of gravity is 9.8 m/s2 . Answer in units of s.
79. ### physics

a 35.5kg box slides down an incline plane with a 25 degree angle at a constant rate. how do i calculate the coefficient of friction
80. ### physics

the sound from a mosquito is produced when its wings vibrates at an average rate of 500 vibrations/sec.What is the tine period of the vibration?
81. ### physics

for starting from rest and moving in a straight line,runner achieves a velocity of 7m/s in a time of 2 seconds .what is the average acceleration of the runer.
82. ### Physics

Two bullets have masses of 4.6 g and 11 g, respectively. Each is fired with a speed of 41.0 m/s. a) What is the kinetic energy of the first bullet? Answer in units of J.
83. ### physics

activity to demonstrate the fact that for a metallic wire of uniform material density and thickness, the resistance increases directly with its length.

a gun tilted upward at 30 degrees fires a bullet with a speed of 215 m/s. what is the bullets velocity parallel to the ground
85. ### College Physics

how much work is required to completely separate two charges (each -1.4 microcoulombs) and leave them at rest if they were initially 8 mm apart?
86. ### physics

CALCULATE THE ACCELERATION FOR A 10.0 KG BLOCK WHICH IS BEING PULLED UP A 35.0 DEGREE SLOPE BY A FORCE OF 140 N IF THE COEFFICIENT OF SLIDING FRICTION IS 0.100
87. ### physics

CALCULATE THE ACCELERATION FOR A 10.0 KG BLOCK WHICH IS BEING PULLED UP A 35.0 DEGREE SLOPE BY A FORCE OF 140 N IF THE COEFFICIENT OF SLIDING FRICTION IS 0.100
88. ### Physics

A 70-kg ancient statue lies in the bottom of the sea. It’s volume is 3.0 x 10 4 cm 3 How . much force is needed to lift it? (Use g=10 m/s 2 and the density of water is 1.0 x 10 3 kg/m 3
89. ### physics

Zephram is on roller blades on a hill. He starts from rest and skates for 5.5s accelerating uniformly at 3.5m/s2. Show that the distance traveled is 53m.
90. ### Physics

Two objects attract each other gravitationally with a force of 2.3×10−10 when they are 0.21 apart. Their total mass is 4.50 . Find their individual masses.
91. ### Physics

Two objects attract each other gravitationally with a force of 2.7×10−10 when they are 0.65 apart. Their total mass is 4.4 Find their individual masses.
92. ### Physics

What is the magnitude of the apparent weight of a 65 astronaut 3600 from the center of the Earth's Moon in a space vehicle moving at constant velocity?
93. ### Physics

About how much pressure do the feet of a 6000-kg elephant exert on the ground? Assume each foot has area of 0.10 square meters.
94. ### physics

A snowboarder of mass 71.8 kg (including gear and clothing), starting with a speed of 4.8 m/s, slides down a slope at an angle θ = 37.1° with the horizontal.
95. ### physics

A transverse wave, frequency 15.0 Hz, travels along a string. Distance between a crest and an adjacent trough is 3.50m. What is its wavelength?

Could someone provide me with a simple explanation of how the Doppler Effect is used to determine the speed and direction of moving object
97. ### Physics

How fast (in rpm) must a centrifuge rotate if a particle 9.00cm from the axis of rotation is to experience an acceleration of 115,000g's?
98. ### Physics

If you tried to smuggle gold bricks by filling your backpack, whose dimensions are 55cm* 30cm *16cm , what would its mass be?
99. ### physics

Solid and hollow cylinders both roll from rest down an inclined plane. Explain the difference in speeds at the bottom.
100. ### physics

1. How far apart must two protons be if the electrical force of repulsion acting on either one is equal to its weight?