74,851 results, page 89
1. ## physics

Four 7.5 kg spheres are located at the corners of a square of side 0.60 m. Calculate the magnitude and direction of the gravitational force on one sphere due to the other three.
2. ## Physics

An astronaut on board a spacecraft is in orbit around the earth in uniform circular motion. Is her velocity speed and acceleration constant?
3. ## Physics

If the heat of 110J is added to a gaseous system, change in internal energy is 40J, then the amount of external work done is?
4. ## Physics Need help plz

An 1900 kg car is traveling with a speed of (22 +- .22) m/s. With what maximum accuracy can its position be determined? delta x= in meters Can someone please help me out I am lost on this on...Thank you
5. ## 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?
6. ## Physics

a roller coaster moves 85m horizontally, then travels 45m at an angle of 30.0 above the horizontal. What is displacement from its starting point?
7. ## Physics

What average force is needed to accelerate a 8.00-gram pellet from rest to 135 m/s over a distance of 0.800 m along the barrel of a rifle?
8. ## 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?
9. ## physics

A 55.0-kg skydiver free falls for a period of time before opening his parachute. What is his kinetic energy when he reaches a velocity of 16.0 meters/second?
10. ## Physics

Four 7.5 kg spheres are located at the corners of a square of side 0.74 m. Calculate the magnitude and direction of the gravitational force on one sphere due to the other three.
11. ## 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?
12. ## Physics check

According to Bohr, an electron in an excited state could give off ..... a continuous cascade of photons for a high-level transition.
13. ## Physics

There is a flash of lighting that gives out a 25 C of negative charge from cloud to ground. Determine the amount of electrons involved? Do i use the formula F=qE I know one coulomb is 1.6 * 10 ^-19
14. ## physics

A 75 kg hockey player glides across the ice on his skates with steel blades. What is the magnitude of the force of friction acting on the skater?
15. ## physics

How much energy expressed in units of food Calories (that is, kilocalories) is required to operate a 100 W light bulb for 14.70 hours?
16. ## physics

An object 5 cm high is placed at a distance of 60 cm in front of a concane mirror of focal length10cm .Find the position and size of image
17. ## physics

A box is sliding down a ramp sloping 25° above the horizontal. The coefficient of kinetic friction is 0.15. What is the acceleration? The answer is 2.8 m/s^2. How can this be solved with out mass?
18. ## physics

a car traveling initially at +7.0 m/s accelerates uniformly at the rate of +0.80m/s2 for a distance of 245 m. what is its velocity at the end of the acceleration?
19. ## physics help

A flywheel turns through 32 rev as it slows from an angular speed of 2.1 rad/s to a stop. How much time is required for it to complete the first 16 of the 32 revolutions?
20. ## physics

An ox exerts a force of 7100N to the horizontal direction without slipping. If the ox has a weight of 8000N, what is the minimum coefficient of static friction?
21. ## 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?
22. ## Ap Physics

On a clear day at the equator with the sun directly overhead, how long would it take to warm 10 kg of water 15 Co if the emissivity of the 1.0 m 2 surface is 1? can someone help me work this out?
23. ## Physics

Two uncharged metal spheres, spaced 20.0 cm apart, have a capacitance of 28.0 pF. How much work would it take to move 14.0 nC of charge from one sphere to the other? *Please report answer in Joules.
24. ## Physics

A racing car has a mass of 1530 kg. The acceleration of gravity is 9.8 m/s^2. What is its kinetic energy if it has a speed of 136 km/h? Answer in units of J.
25. ## physics

How strong an electric field is needed to accelerate electrons in a TV tube from rest to one-tenth the speed of light in a distance of 4.9 cm ?
26. ## physics

how does mass energy relate to the hydrogen bomb? i can't find anything that simply explains this to me and i need6 it for a powerpoint presentation tomorrow please help.
27. ## Physics

Three charges (q1 = 8.7 nC, q2 = -7.2 nC, and q3 = -4.8 nC) are at the corners of a square of side a = 9.2 cm, as shown in the picture. Determine the magnitude of the resultant electric force on each charge.
28. ## physics

a body moves in such a way that has a dislacement of 12m towards east,5m towards the north and then 9m vertically upwards. compute the magnitude of its resultant displacement.
29. ## Physics

A wire length 2m and radius 1mm is stretched by 25mm on application of a force of 1000N.Calculate the young modulus
30. ## physics

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

An automobile of mass 1200kg accelerates from rest to a speed of 20.0m/s in 12.0 seconds. What is the magnitude of the net force acting on the auto?
32. ## physics

1 A steel wire, 150 m long at 10¢XC, has a coefficient of linear expansion of 11 „e 10ƒ{6/C¢X. Give its change in length as the temperature changes from 10„aC to 45„aC. 5.8 cm
33. ## Physics

A motorcycle with a mass of 350 kg is accelerated from rest to a velocity of 30 m/s by a force of 4000 N. calculate the distance over which this acceleration occurred.
34. ## Physics

A construction worker exerts 209N to move a load of bricks a distance of 10m across the parking lot,how much work does he do?
35. ## physics

when preparing to undergo an MRI scan, why are patients advised to remove eyeglasses, watches, jewelry, and other metal objects?
36. ## Physics

A construction worker exerts 209N to move a load of bricks a distance of 10m across the parking lot,how much work does he do?
37. ## physics

A small rocket is fired directly upwards with an initial velocity of 100m/s, How many seconds will it take to reach its maximum height?
38. ## physics

A particle is drop from a vertical height (h) and falls freely for a time(t) with the aid of a sketch explain how (h) varies with (I) t (ii) t square
39. ## Physics

What will happen to the time of collision if you add weight to a cart but keeps its speed the same and send it rolling down a incline towards a force sensor?
40. ## 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?
41. ## physics

a d'arsonval meter movement deflects to 0.8mA. what is the peak value of the alternating current if the instrument uses full-wave rectification?
42. ## Physics

a roller coaster moves 85m horizontally, then travels 45m at an angle of 30.0 above the horizontal. What is displacement from its starting point?
43. ## Physics

A cyclist moving on a corcular track of radius 40m completes half a revolution in 40 sec. Its average velocity is nearly
44. ## Physics

Find the volume occupied by 3.14 moles of an ideal gas at standard conditions of pressure and temperature (P = 1.00 atm, T = 273 K).
45. ## 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?
46. ## physics

a plank will break if a forces of 350 N is applied to its center.What is the largest weight it can support if it is titled to an angle of 35degrees?
47. ## Physics

Suppose that a disk rotates through two revolutions in 5.5 seconds. (a) What is its displacement in radians in this time? (b) What is its average rotational velocity in rad/s?
48. ## 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?
49. ## Physics

A tumor of 120 g absorbs a total of 1.7 J of energy. Determine the absorbed dose in rads. I got 1417 rad, am I correct? Thanks!
50. ## physics

A ball thrown straight up takes 5.80 seconds to go up and come back down to its starting point. Neglecting air resistance, how high (in m) does it go?
51. ## physics

two vhiles move in opposite dirctions to each other with constant speeds of 20 m/s and 30 m/s if the initial distance betwen the vehicles is 100 km. how many second later do they meet
52. ## physics 11th class

Calculate the power of a crane in watts which lifts a man of 100kg to a height of 10m in 20sec
53. ## physics

What must be the radius of an unbanked (flat) curve so that a car can safely travel at a maximum speed of 39 m/s? The coefficient of static friction is 0.70.
54. ## physics

As a projectile shot at an upward angle rises and falls what happens to its horizontal component of its velocity if we neglect air resistance?
55. ## physics

An automobile tire is rated to last for 60,000 miles. To an order of magnitude, through how many revolutions will it turn? I don't know what circumference i should use for 1 rev
56. ## Physics

How much work is done pushing a wheel barrow full of cement 5.3m forward if a force of 500N is applied 20 degrees from the vertical?
57. ## Physics

Calculate the potential energy of a 40 gram sparrow resting on a branch 30 feet above the ground. (Hint: 1 foot = 0.305 m)
58. ## physics!!

A circuit contains a 12V power source, and a 3ohms, 4ohms, and 6ohms, resistor. How should the resistors be arranged for the current through the battery to be 2A? Please help!THANKS!
59. ## Physics

A 6.5-kg bowling ball thrown with a speed of 5.4 m/s hits a stationary 1.75-kg pin. What is the velocity of each object? Assume that the coefficient of restitution is 0.75.
60. ## physics

At what displacement from the equilibrium is the total energy of a simple harmonic oscillator one - sixths KE and five - sixth PE? Answer should be in terms of the amplitude A.
61. ## physics

Charge of uniform surface density (0.2 nC/m2) is distributed over the entire xy plane. Determine the magnitude of the electric field at any point having z = 2 m.
62. ## physics

The edges of a shoebox are measured to be 11.9 cm, 17.3 cm, and 29 cm. Determine the volume of the box retaining the proper number of significant figures in your answer.
63. ## physics

an object weighs 10N on earth .what is the objects weight on a planet one tenth the earths mass and one half its radius?
64. ## physics help

Assuming a typical efficiency for energy use by the body, how many slices of pizza must you eat to walk for 3.0 hr at a speed of 5.0 km/hr ? (Assume your mass is 68 kg).
65. ## 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.
66. ## 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
67. ## 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 )
68. ## Physics

A ceiling fan of radius 1.0 m is rotating with a frequency of 300 RPM. How fast (in m/sec) is the tip of one of the blades moving?
69. ## physics

An airplane whose airspeed is 295 km/h flies parallel to the direction of a wind with a speed of 40.0 km/h. What are the two possible speeds of the plane relative to the ground?
70. ## physics

Two 72.0 kg hockey players skating at 7.00 m/s collide and stick together. If the angle between their initial directions was 120 degrees, what is their speed after the collision?
71. ## Physics

The steel I-beam in the drawing has a weight of 5.22 × 103 N and is being lifted at a constant velocity. What is the tension in each cable attached to its ends?
72. ## Physics

A dense plastic toy of mass 1.8 kg is floating just beneath the surface of a pond. What is the buoyant force on it? Answer in units of N.
73. ## physics

Find the angular velocity of a body rotating with an acceleration of 2 rev/s square as it completes the 5th revolution after the start.
74. ## Physics

The condensing pressure is 260psig and the metering device inlet temperature is 100 degrees for R-22 what is the total subcooling in the system?
75. ## 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.
76. ## physics

A solid sphere of mass 2 kg is rolling without slipping on a table with linear speed of 0.5 m/s. Calculate its total kinetic energy.
77. ## 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?
78. ## physics

A 55.0-kg skydiver free falls for a period of time before opening his parachute. What is his kinetic energy when he reaches a velocity of 16.0 meters/second?
79. ## physics

how the frequency of the sound produced will change in the case of aluminium sting of length 15cm when the string is tied between two ends
80. ## physics]

a body moving along a straight line at 20 m/s undergoes an acceleration of 4 metre per second square.after two seconds what will be its speed? also, find the displacement .
81. ## physics

You want to design a curve, with a radius of curvature of 35.0 m, so that a car can turn at a velocity of 15 m/s on it without depending on friction. At what angle must the road be banked?
82. ## physics

Does anyone know what this is about? please help I would be more than grateful.. How does Rutherford’s model of the atom account for the back – scattering of alpha particles directed at the gold leaf
83. ## 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.
84. ## physics

The brakes on your automobile are capable of creating acceleration of 14 ft/s2. If you are going 66 mi/hr and suddenly see a state trooper, what is the minimum time required to get your car to 55 mi/hr?
85. ## Physics

How large must the coefficient of static friction be between the tires and the road if a car is to round a level curve of radius 85 m at a speed of 95 km/h?
86. ## physics

can someone please help me with this question quick... Which of the following equations expresses Newton's law of universal gravitation? a. Fc=MVt^2/r b. Fg=M1M2/r c. g=Gme/r^2 d. Fg=Gmme/r^2 i really need help..thanks:-)
87. ## Physics

An echo in Cowboys Stadium is heard after 2 seconds. How far is the person standing from the wall if the speed of sound is 340 m/sec?
88. ## physics

A 912 kg drag race car accelerates from rest to 108 km/h in 0.795 s. What change in momentum does the force produce?
89. ## physics

a gazelle attempts to leap a 2.1m fence. assuming a 45 degree takeoff angle, whats the min speed for the jump
90. ## physics

A 4.5 kg object is accelerated from rest to a speed of 39.2 m/s in 76 s. What average force was exerted on the ob- ject during this period of acceleration? Answer in units of N
91. ## Physics

When a body slides along an inclined plane of height 'h' and describes a vertical circle of radius r on reaching the bottom Ans:h =5R/2
92. ## Physics

A particle covers an angle of 120¡ã while moving along the circumference of a circle. Find distance and displacement.
93. ## AP physics

Two locomotives approach each other on parallel tracks. Each has and average spend of 150 km/h with respect to the ground. If they are initialy 8.5 km apart, how Long will it be before they reach each other?
94. ## Physics

How fast (in rpm) must a centrifuge rotate if a particle 69-cm from the axis of rotation is to experience an acceleration of 200438 g's? (can you show me how you get the answer) be thorough
95. ## Physics

Calculate the work done in lifting a 600-N barbell 1.6m above the floor. Express your answer to two significant figures and include the appropriate units.
96. ## Physics

What is the magnitude of the force per meter of length on a straight wire carrying an 8.50 -A current when perpendicular to a 0.55 -T uniform magnetic field?
97. ## Physics

Find the angle of elevation of a gun which fire a shell with velocity 120m/s and hit a target on the same level but at 1300m