# Math/Physics

214,834 results, page 86

1. ### physics

carbon dioxide forms into solid (dry ice)at approximately -150 F. What temperature in degree celsuis does this correspond to?
2. ### physics

water is moving at a velocity of 2m/s through a hose with an internal diameter:1.60cm. What is the flow rate in liters per second?
3. ### Physics

Five forces act on an object. (1) 63 N at 90° (2) 40 N at 0° (3) 83 N at 270° (4) 40 N at 180° (5) 50 N at 60° What are the magnitude and direction of a sixth force that would produce equilibrium?
4. ### Physics

how fast would you have to be traveling at in a spaceship in order to appear to age 20% slower than your classmate left behind on earth
5. ### Physics

Three resistors 2.5 Ù, 3.5 Ù and 4 Ù are connected in parallel. What is the equivalent resistance? I know you must use 1/Req = 1/R1 + 1/R2 + 1/R3 But then I get .935 and I don't think that's correct. What am I missing? Thanks

Two nitrogen atoms are separated by 4 cm. Each atom has 2 extra electrons. What is the force between them? is it attractive or repulsive? Explain.
7. ### Physics

A stone popelled from a catalpult with the speed of 50m/s attained a height of 100m. Calculate the time of flight and angle of projection.
8. ### physics

what frequency and period would be required for sally and her hard-working partner to produce a standing wave with three nodes?
9. ### Physics

Calculate the magnitude of the drag force on a missile 63 cm in diameter cruising at 220 m/s at low altitude, where the density of air is 1.2 kg/m3. Assume C = 0.75.
10. ### Physics

A satellites are placed in a circular orbit that is 1.62 × 108 m above the surface of the earth. What is the magnitude of the acceleration due to gravity at this distance?
11. ### physics

How fast is a city on the earth's equator (such as Singapore) moving due to our planet's daily spin on its axis?
12. ### Physics

in a wire AB of uniform cross section in which a potential gradient of 0.1 V/m exist.If the balancing point is foung to be 180 cm from A then what is the Emf of the cell?
13. ### Physics

An electric filament can heat 200 cm3 of water from 5°C to 95°C in 6 minutes. If the voltage source is a 12 V battery, how much current does it draw?
14. ### physics

A 71.1 kg man steps out a window and falls (from rest) 1.24 m to a sidewalk. What is his speed just before his feet strike the pavement?
15. ### Physics

What is the total kinetic energy if a 0.30 kg block is sliding on a smooth horizontal surface at 2.5 m/s, heading towards a light spring that is in equilibrium?
16. ### Physics

What is the total kinetic energy if a 0.30 kg block is sliding on a smooth horizontal surface at 2.5 m/s, heading towards a light spring that is in equilibrium?
17. ### physics

if a cyclist takes one minute to comple half revolution on a circular path 120 m radius.what is the average velocity?
18. ### physics

2 balss,one of iron and the other of aluminium,will experience the same upthrust, when dipped in water when both have equal what?
19. ### 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?
20. ### Physics/Optics

What would the image size of the moon be if you photographed it at Cassegrain focus of a 24-inch telescope with a focal length of 9600mm?
21. ### Physics

Moment of inertia of a 'non-uniform' ring of mass M and radius R about axis through centre and normal to its plane is
22. ### physics

A group of hikers hears an echo 2.50 s after shouting. If the temperature is 20.0°C, how far away is the mountain that reflected the sound wave?
23. ### Physics

An object of mass 20kg slides down an inclined plane at an angle of 30 degree to the horizontal. The coefficient of static friction is?
24. ### physics

A production line inspector wants a mirror that produces an image that is upright with a magnification of 7.1 when it is located 10.0 mm from a machine part. What is its radius of curvature?
25. ### PHYSICS

A SPRING WITH A CONSTANT K = 8N/m IS STRETCHED 5CM AND RELEASED. IT BOBS UP AND DOWN EVERY 2.5 SECONDS. WHAT IS ITS FREQUENCY, PERIOD, ABD AMPLITUDE
26. ### physics

The distance between two planets is 1.6 x 10^6 m. How much time would the light signal take to go from one planet to the other?
27. ### Physics

Temperature of a diatomic gas is 300k. If the moment of inertia of its molecules is 8.28*10^-38 gm-cm^2. Calculate their root mean square angular velocity.
28. ### Physics to Elena

Ex=0 ; Ez=0 Ey = 10   sin(3.14x - 6.08e8 t) what is the time-averaged Poynting vector (magnitude and direction) for the position x=y=z=−3 ?
29. ### PHYSICS/CHEMISTRY

Can someone explain to me, what does Metastable isotope means? I already read the definitions on the internet but I really don't understand it. Thanks in advance.
30. ### physics

a 75-kilogram bicylcist coasts down a hill at a constant speed of 12 meters per second. what is the kinetic energyof the bicyclist?
31. ### physics

How many calories of heat must be added to 455 g of steel to raise its temperature from 20 °C to 192 °C? (Note: csteel = 0.115 cal./g. °C.)
32. ### physics

How far to the nearest tenth of a meter can a runner running at 5.33 m/s run in the time it takes a rock to fall from rest 67 meters?
33. ### 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.
34. ### Physics

At what distance should an object be placed in front of a convex lens of focal length 20 cm to obtain an image of double its size
35. ### science (physics)

a skaterboarder is moving 5.25 m/s when he starts to roll up a frictionless hill. how much higher is he when he comes to a stop? (energy problem)
36. ### Physics

An arrow of mass 1000kg was fired from rest with a velocity of 15m/secs for a period of 0.5secs.calculate the applied force.
37. ### physics

a monatomic gas initially at 19 degree celsius is suddenly compressed to 1/10th its original volume .what is temperature after compression?
38. ### physics

two ropes are tied on a post and applied with forces of 8 and ion.If the amgle between them is 60degrees. Find the resultant vector
39. ### Physics

A block weighing 6.2 N requires a force of 2.2 N to push it along at constant velocity. What is the cooefficient of friction for the surface? Plsssss help asap..
40. ### physics

What mass would you hang on the right side of the system in the figure to balance it -- that is, to make the clockwise and counterclockwise torques equal? (Let x1 = 30 cm and x2 = 12 cm.)
41. ### Physics

The flux through a window whose surface is parallel to magnetic field lines is zero. Answer True False
42. ### Physics

A material that remains highly magnetized after a magnetization cycle has a large hysteresis area. Answer True False
43. ### physics (fluids)

If a object of radius 3 cm is attached to the ground in a 3 m deep sea, what is the vertical force in N with which the water (density = 1000 kg/m^3) presses on it?
44. ### physics

Using a small pendulum of length 0.171 m, a geophysicist observes that it completes 1 cycle every 0.833 s. What is the value of g at his location?
45. ### physics

An 8 hour exposure to a sound level of 95.0 dB may cause hearing damage. What energy in joules falls on a 0.850 cm diameter eardrum so exposed?
46. ### physics

An 8 hour exposure to a sound level of 95.0 dB may cause hearing damage. What energy in joules falls on a 0.850 cm diameter eardrum so exposed?
47. ### physics

An 8 hour exposure to a sound level of 95.0 dB may cause hearing damage. What energy in joules falls on a 0.850 cm diameter eardrum so exposed?
48. ### physics 2

calculate the mass of air inside a 500 liter container at a pressure of 200 kpaa and temperature is 30 degree celsuis
49. ### Physics

“Strontium-90 is a pure beta source.” How could a physicist test this statement? I am stuck on this one, but I was thinking through measurement of radioactivity.
50. ### physics

A bullet was fired horizontally from the top of a 1.5x10^2 m tall tower at 2.8x10^2 m/s. Determine its speed on impact with the ground below.
51. ### Physics

If Joe rides south on his bicycle in a straight line for 29 min with an average speed of 14.8 km/h, how far has he ridden? Answer in units of km
52. ### Physics

A boy sledding down a hill accelerates at 1.24 m/s2 . If he started from rest, in what distance would he reach a speed of 8.88 m/s? Answer in units of m
53. ### Physics

An elevator is moving upward 1.17 m/s when it experiences an acceleration of 0.33 m/s2 downward, over a distance of 0.75 m. What will its ﬁnal speed be? Answer in units of m/s
54. ### Physics

If a car is going .197 meters per second, how long will it take to go 5 kilometers (assuming the ground is perfectly flat).
55. ### Physics

A ball rolling down a hill was displaced at 19.6m while uniformly accelerating from rest. If the final velocity was 5.00 m/s what was the rate of acceptation?

a rubber ball is thrown downwards off a balcony. after it travels 55m it has a speed of 46.5m/s. what is the initial velocity
57. ### physics

If you push a box a distance of 2,000 meters with a force of 1 newton, how many Calories have you used? 1 Calorie= 4,187 Joules
58. ### physics

What is the angular separation between the first-order images on either side of the central maximum? Answer in units of degrees.
59. ### physics

A violin string vibrates at 298 Hz when unfingered. At what frequency will it vibrate if it is fingered one sixth of the way down from the end?
60. ### Physics

What happens to your tongue when you lick an aluminum ice cream scrapper just after it has been used? Does it stick to the scraper? Why?
61. ### Physics

What happens to your tongue when you lick an aluminum ice cream scrapper just after it has been used? Does it stick to the scraper? Why?
62. ### 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 64 km/h at the end of 75 m?
63. ### 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?
64. ### Physics

In a vacuum, two particles have charges of q1 and q2, where q1 = +3.7 µC. They are separated by a distance of 0.22 m, and particle 1 experiences an attractive force of 3.5 N. What is q2 (magnitude and sign)?
65. ### Physics

If you stood atop a ladder that was so tall that you were twice as far from Earth's center, how would your weight compare with its present value?
66. ### physics

A ray of light goes through the centre of a semicircular glass disk, n = 1.58, and onto a wall (x = 19.4 cm, y = 5.06 cm). What is the incident angle, θ?
67. ### Physics

How much charge is contained in 9kg of electrons? Express your answer to two significant figures and include the appropriate units.
68. ### Physics

How much charge is contained in 9kg of protons? Express your answer to two significant figures and include the appropriate units.
69. ### physics

What is the expected period of beats formed when two tuning forks sound simultaneously and have the frequencies f1= 250Hz and 242Hz?
70. ### physics

a framed painting weighs 220 newtons. the 2 wires support an angle of 120 degrees with each other. what are the tensions on the wire?
71. ### physics

Find the pottential energy of a boy of mass 10kg standing on a building floor 10 meters above the ground level p.e?
72. ### physics

A 750 kg rocket accelerates straight upward from the ground at 60 m/s2. What is the force (thrust) provided by the engine? with a gravitational pull of 10 m/s2 down
73. ### physics

you are driving up a long, inclined road . after 1.20 mi you notice that signs along the roadside indicate that your elevation has increased by 550 ft.
74. ### physics

How far to the nearest tenth of a meter can a runner running at 10 m/s run in the time it takes a rock to fall from rest 99 meters?
75. ### Physics

A 172 N sign is supported in a motionless position by two ropes that each make an angle of 36° with the horizontal. What force does each rope exert?
76. ### physics

Five forces act on an object. (1) 57 N at 90° (2) 40 N at 0° (3) 77 N at 270° (4) 40 N at 180° (5) 50 N at 60° What are the magnitude and direction of a sixth force that would produce equilibrium?
77. ### Physics

The peak wavelength and observed color of a 50,000 K star is 58nm and too blue to see with the human eye. True or False.
78. ### physics

A 1200kg car travels at a constant speed of 12 m/s around a horizontal, circular track with a radius of 45m. What is the magnitude of the centripetal for
79. ### Physics

two objects attract each other gravitationally with a force of (2.5)(10^-10)N when they are 0.25m apart. Their total mass is 4.0 kg. Find their individual masses.
80. ### Physics

If m1 = 4.72kg, what mass m2 is required to balance the system? (two masses are connected by a rope. m1 is sitting on an incline and m2 is hanging from a pulley)
81. ### physics

calculate the work done on a 1550kg elevator car by its cable to lift it 40 m at constant speed assuming friction average 125 n
82. ### physics

a car that's 1000 kg is stopped and the brakes exert a force of 3000 N over a distance of 891 meter, how much work is done?
83. ### physics

a bus starts from rest and achieves a velocity of 20m/s in 10s while moving westwards.calculate its avarage acceleration
84. ### physics

Two forces F1 and F2 ifF1is double that ofF2 and the resultant is perpendicular on F1 then the angle betwee them is Expain ans with reason and diagram
85. ### physics

Which of the following situations represents a negative displacement? (Assume positive position is measured vertically upward along a y-axis.)
86. ### physics

An american system of communication is based on the radio frequency of 76 Hz. Compute the wavelength of theses waves and compare it to the diameter of the earth.
87. ### physics

An electric stove operates on a larger 220 V line. How much power is needed to cook a pizza if 0.45 A of current is used.
88. ### Physics

The displacement, force, velocity, and acceleration vectors’ components are given. Calculate the magnitude and direction of each vector. (a) x = +15.0 cm, y = -12.3 cm. I am completely lost.
89. ### physics

The gravitational field strength of an unknown planet is 15.5 N/kg on its surface. Calculate the value of g if the planets mass and radius were both doubled.
90. ### Physics

A car of mass is 100 kg applies break from 40 km per hours to 0 .it takes 12 seconds .what amount of force is applied for breaks?
91. ### physics

A 31.4-kg diver free falls from the diving board and hits the water with a speed of 10.0 m/s. Based on this information, the height of the tower is __________
92. ### physics

Show that the critical velocity of body revolving in cercular orbit very close to the surface of a planet of radiuis R and meandencity.
93. ### Physics

Given an angle of 30 degrees, find the minimum initial speed of a cannon ball that travels in a horizontal distance of 15000 mi.
94. ### physics

A carton of juice remains intact even after you have sucked out all the drink from it. please explain
95. ### Physics

A body's temperature is increased from 900K to 1900K. By what factor does the total power radiated per unit area increase?
96. ### Physics

What is the threshold frequency for the photoelectric effect on lithium (phi= 2.93eV)? What is the stopping potential if the wavelength of the incident light is 400nm?
97. ### Physics

A television tube operates at 20,000V. What is min wavelength for the continuous x-ray spectrum produced when the electrons hit the phosphor?
98. ### Physics

Starting from rest, Mr.M's bus achieves a velocity of 25 m/s in a distance of 1.0 km. Find the time and the acceleration. I don't know which formula to use. Delta T = Vf - Vi / Aavg ?
99. ### Physics

A body's temperature is increased from 900K to 1900K. By what factor does the total power radiated per unit area increase?
100. ### Physics

What is the threshold frequency for the photoelectric effect on lithium (phi= 2.93eV)? What is the stopping potential if the wavelength of the incident light is 400nm?