74,851 results, page 60
1. ## physics

Explain how an object can orbit a planet & why astronauts float around in the orbiting space shuttle
2. ## physics

What is the magnitude of the displacement of a car that travels half a lap along a circle that has a radius of 170m ?
3. ## Physics

what is the mass of hydrogen peroixide, H2O2, in 350 grams ofa 20% by weight solution?
4. ## Physics

Two spherical objects with a mass of 7.60 kg each are placed at a distance of 2.93 m apart. How many electrons need to leave each object so that the net force between them becomes zero?
5. ## Physics

What is the de Broglie wavelength of an electron that strikes the back of the face of a TV screen at 1/9 the speed of light?
6. ## physics

a cyclist does work at the rate of 500w while riding. how much force does her foot push with, when she is traveling at 8.0 m/s?
7. ## PHYSICS

If a DeLorean rolls gently (vo = 0) off a vertical cliff, how long does it take it to reach a downward velocity of 78 km/h?
8. ## Physics

Find the electric potential at the centre of the square of side 1m at the four corners of charges of q1, q2,q3,and q4 are placed having values 3×10^-8C,-3×10^-8C,-5×10^-8C and 6×10^-8C respectively.
9. ## physics

Find the minimum kinetic energy needed for a 3.7×104-kg rocket to escape the Moon.
10. ## physics

what minimum initial velocity must aprojectile have to reach atarget at a distance of 25m away? (g: 10m/s)
11. ## physics

An elevator is moving upward at 0.93 m/s when it experiences an acceleration 0.29 m/s2 downward, over a distance of 0.67 m. What will its final velocity be?
12. ## Physics

A 5 N force directed to the west acts on an object for 2.0 seconds. What is the change in momentum of the oject? Would it be 5 X 2?
13. ## physics

two equal vectors of magnitude 2A are inclime perpendicular to each other find the resultant and direction of vector.
14. ## physics

For an object in equilibrium the sum of the torques acting on it vanishes only if each torque is calculated based on your:
15. ## physics

An elevator is moving upward at 1.00 m/s when it experiences an acceleration 0.28 m/s2 downward, over a distance of 0.74 m. What will its final velocity be?
16. ## physics

What is the frequency of the EM wave emitted most strongly by a glowing element on a stove with temperature 1,500 K
17. ## physics

Rubidium forms the postive Rb+ Is this ion larger or smaller then the neutral atom? Explain PLEASE
18. ## Physics

When you swim across a river does the time it takes to get to the other side depend on the rate of flow of the water?
19. ## physics

Find the rms speed of H2O molecules in atmospheric water vapor at a temperature of 13.2° C.
20. ## Physics

What is the maximum circular speed the astronaut can have before he breaks free of gravity and goes drifting off into space?
21. ## physics

My teacher needs us to formulate a question for the science fair. Till now, we have only learned the Kinematics equations, HELP, please....
22. ## PHYSICS

A girl rows 10 km downstream in 2 h. Her return trip takes 4 h. How fast can she row in still water. in km/h?
23. ## Physics

why do photoelectrons emitted from a metal surface has energy distribution for an incident radiation of frequency?
24. ## Physics

What is the final velocity of a hoop that rolls without slipping down a 5.00-m-high hill, starting from rest?
25. ## Physics

With what maximum speed can an unsecured passenger stay in their seat on a Ferris wheel that has a diameter of 12 m.
26. ## physics

During a hard sneeze, your eyes might shut for 0.43 s. If you are driving a car at 125 km/h, how far does it move during that time?
27. ## Physics - Magnetism

The direction of magnetic lines of force change if an iron piece is placed in its field. Why?
28. ## Physics

At its peak, a tornado is 60.0 m in diameter and carries 500 km/h winds. What is its angular velocity in revolutions per second?
29. ## physics

How long will it take a 1280 W motor to lift a 345 kg piano to a sixth-story window 19.0 m above?
30. ## Physics

What is the efficiency of a crane that used current of 8A at 150V to raise 450kg load at the rate of every minutes?
31. ## Physics

Calculate the length of a displaced pendulum Bob which pass through its lowest point twice every second. Take g=10m/s²
32. ## physics

Consider the motion of the tip of the minute hand of a clock. In one hour, the displacement and average velocity is .......
33. ## physics

What is the volume of a metal which weighs 28g less in kerosene and the densty is 800 kgm3 than it does in air
34. ## physics

Where must an object be placed to have a magniﬁcation of 3.74 in front of a converging lens of focal length 14.1 cm?
35. ## physics

What is the minimum work in joules needed to push a 1540 kg car 44.0 m up a 12.5 degree incline?
36. ## Physics

A 1300 kg sports car accelerates from rest to 85 km/h in 6.2 s. What is the average power delivered by the engine?
37. ## Physics

a 52kg person riding a bike rotates her wheels in a circle of 17 cm what is her max tourque
38. ## Physics

Suppose that you want to take a photograph of yourself as you look at your image in a flat mirror 1.6 away. For what distance should the camera lens be focused?
39. ## physics/electrical circuits

if there are eleven resistors of 33k ohms each in parallel, what is the total resistance?
40. ## PHYSICS

AN OBJECT MASS OF 10KG IS PLACED ON AN INCLINED PLANE AT 30 degree at the horizontal calculate recreation between two su
41. ## physics

Earth is approximately a sphere of radius 6.37 × 106 m. What are (a) its circumference, (b) its surface area, and (c) its volume? please help
42. ## Physics

What will a spring scale read for the weight of a 75 kg woman in an elevator that moves upward with acceleration 0.30 g? w=?
43. ## physics

The boats have a mass of 30 kg. The stopping splash lasted about 1.5 s. What acceleration is required to stop the flume?
44. ## physics

a plane travels 5.0 x 10^2 while being accelerated uniformly from rest at the rate of 5.0 m/s. what final velocity does it attain?
45. ## Physics

Calculate the speed of an 7.8×104 kg airliner with a kinetic energy of 1.0 × 109 J. Answer in units of m/s.
46. ## 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?
47. ## physics

A boy sledding down a hill accelerates at 2.00 m/s2. If he started from rest, in what distance would he reach a speed of 5.20 m/s?
48. ## AP Physics

What is the potential energy of an electron and proton in a hydrogen atom if the distance between them is 5.3*10^-11? ANSWER k=9*10^9 Q=1.6*10^-19 q=1.6*10^19 Ue=? Ue=KQq/r Ue=-4.4*10^-18 j
49. ## Physics

What is the formula to find magnetic field at the centre of the solenoid of hollow iron core??
50. ## PHYSICS

An airplane accelerates down a runway at 3.20 m/s 2 for 32.8 s until is finally lifts off the ground. Determine the distancetraveled before takeoff.
51. ## 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? Why?
52. ## Physics

How much work is required to bring a 1000 kg racing car traveling at a speed of 60 km/hr to rest?
53. ## physics

a 5kg suitcase slides 2m down a frictionless ramp incline at 45 degress. How fast is it going at the bottom?
54. ## physics

the mathematical form of the thin-lens equation predicts that a graph of 1/p vs 1/q should have a slope of -1, explain?
55. ## Physics

What is the time it takes a mosquito to flap its wings once if the frequency of their wing beats is 440Hz?
56. ## Physics

Why is it that interference effects don't show up regularly in glass window panes with two surfaces?
57. ## Physics

Assuming the earth to be a uniform sphere of radius 6400 km and density 5.5g/c.c. find the value of g on the surface where G=6.67×10
58. ## physics

a projectile is fired at an angle of 60 degrees with the horizontal and with the initital velocity of 80 m/s. What is the time of flight?
59. ## Physics

A boy sledding down a hill accelerates at 1.70 m/s2. If he started from rest, in what distance would he reach a speed of 7.40 m/s?
60. ## physics

C1=3.00uF and Vab = 120V. The charge on capacitor C1 is 150 uC. Calculate the voltage across the other two capacitors.
61. ## physics

If wind blows at 44 m/s over a house, what is the net force on the roof if its area is 180 m^2 and is flat?
62. ## physics

A 30.0 kg block falls from a height of 30,4 m. assuming a closed system its speed just before hitting the ground is about?
63. ## GENERAL PHYSICS

Two long, parallel wires separated by 90 each carry currents of 2.0 in a horizontal direction.
64. ## physics

How many times a minute does a boat bob up and down on ocean waves that have a wavelength of 43.0 m and a propagation speed of 5.25 m/s?
65. ## Physics

A boy sledding down a hill accelerates at 1.70 m/s2. If he started from rest, in what distance would he reach a speed of 7.40 m/s?
66. ## physics

How long will it take a 1630 W motor to lift a 285 kg piano to a sixth-story window 16.0 m above?
67. ## physics

what is the wavelength of radar waves with the frequency of 6.0*10^10Hz? a. 0.0010m b.0.010m c.0.050m d.0.0050m
68. ## Physics

How much force is needed to hold a nearly weightless but rigid 1-L carton beneath the surface of water?
69. ## Physics

Two protons, an infinite distance apart are brought together to a separation of 1 nm. What is the initial potential energy of the system?
70. ## physics-magnetism

The direction of magnetic lines of force change if an iron piece is placed in its field. Why?
71. ## Physics

In an experiment to explore the nature of the relationships between velocity, force, and acceleration, what important issues are being ignored?
72. ## physics

A stone is projected vertically upward with a speed of 20 m/s. a. What is its velocity at the end of 2s? b. What is the height reacted after 2s?
73. ## Physics

In an experiment to explore the nature of the relationships between velocity, force, and acceleration, what important issues are being ignored?
74. ## physics

How does one go about solving this? A skateboard rider starts from rest and accelerates at a constant +.50 m/s^2 for 8.4s. What is the riders displacement?
75. ## Physics

A 6.25 kg solid ball with a radius of 0.185 m rolls without slipping at 3.55 m/s. What is its total kinetic energy?
76. ## physics

A spring has k = 88 N/m. Use a graph to determine the work needed to stretch it from x = 3.6 cm to x = 5.6 cm, where x is the displacement from its unstretched length.
77. ## physics

A stone of mass m kg is held h metres above the floor 50s.The workdone in joules over this period is
78. ## physics

if a race car's velocity increases from 4 m/s to 36 m/s over a 4 s time interval, its average acceleration would be 10 m/s 2 ? IS THIS TRUE ?
79. ## physics

2)if a curved of radius 50m is banked at 30 degree will a car travelling at 60 km/hr along the curve will safe?
80. ## College physics

You have a collection of six 1.0 kilo ohm resistors. what is the smallest resistance you can make by combining them
81. ## physics

what potential difference delta V is required to accelerate protons from the rest to 10% of the speed of light?
82. ## physics

What is the gravitational force on a 20Kg satellite circling the earth (Re = 6.4 x 10^6 m, Me = 6 x 10^24Kg) with a period of 5hr?
83. ## Physics

explain the concept of electric potential difference in terms of work done in transferring the charge
84. ## Physics

explain the concept of electric potential difference in terms of work done in transferring the charge
85. ## Physics

Two violin players tuning their instruments together hear 8 beats in 2 s. What is the frequency difference between the two violins
86. ## physics

Which phase of matter consists of particles that are locked into place and unable to move past each other?
87. ## science (physics)

thank you for your help! my question is :how do you find the magnitude of the electric field that will balance the weight of an electron?
88. ## physics

"If you have an inductor that has an inductive reactance of 125 ohms, on a 60Hz frequency, what would be the inductance in henry's?"
89. ## Physics

A motor cyclist travelling at 12m/s decelerate at 3m/s(squared)? How far does he travel while coming to rest?
90. ## Physics

A bullet fired vertically upwards reaches a height of 500m. [g=9.8m/s2]. What is its initial velocity?

You want to show that V^2 - Vo^2 = 2 a (X - Xo) first rewrite that as: (V-Vo)(V+Vo) = 2a (X-Xo) now your average velocity during the interval = (V+Vo)/2 so X = Xo + t(V+Vo)/2 but V = Vo + a t so t = (V-Vo)/a so X = Xo +(V-Vo)(V+Vo)/2a we are there.
92. ## Physics

What is the gravitational force between two 10 kg iron balls separated by a distance of 0.1 m? How does this compare with the weight of one ball?
93. ## physics

the density of a block of wood with a colume of 50 cubic centimeters and a mass of 10o grams is
94. ## Physics

At highway speeds, a particular automobile is capable of an acceleration of about 1.52 m/s2. At this rate, how long does it take to accelerate from 74.0 km/h to 104.0 km/h? (in s)
95. ## Physics

Wat direction will the Electric Field Lines be in a parallel plate capacitor containing a dielectric ?
96. ## physics

when two lenses of focal length +10cm and -5cm are placed in contact then find the net power ?
97. ## Physics

Explain how a drop of water bulging over the edge of a coin demonstrates surface tension.
98. ## Physics

torque to move a block of m=200kg for 10m at an angle of 25 degree with a speed of 20m/s.
99. ## Intro to Physics

With scanning probe microscopy technology, we see not actual atoms but rather images of them. Explain.
100. ## physics

Show that the acceleration is 7.5 m/s2 for a ball that starts from rest and rolls down a ramp and gains a speed of 30 m/s in 4 s