Math/Physics

214,834 results, page 68

1. physics

A projectile is fired straight up at a speed of 15 m/s. How long does it take to reach the top of its motion? The acceleration of gravity is 9.8 m/s2 .
2. physics

A projectile is fired straight up at a speed of 15 m/s. How long does it take to reach the top of its motion? The acceleration of gravity is 9.8 m/s2 .
3. Physics

five hundred kcal of heat is added to 2-kg of water at 80 degree Celsius. how much steam is produced?
4. physics

A car traveling initially at 7.41 m/s accelerates at the rate of 0.752 m/s 2 for 2.74 s. What is its velocity at the end of the acceleration? Answer in units of m/s
5. physics

the constant velocity of a ball is (3x+2y)m/sec. find the distance traveled in the y direction in 2 seconds (x and y are unit vectors)?
6. physics

An airplane flies north at a constant speed for 6h and covers a distance of 2400km. What is the plane's velocity? The acceleration?
7. physics

George takes off for a long jump at an angle of 28 degrees, and lands 6.9 m away. How fast was he when he jumped?
8. physics

The force of tension of a rope is 300N. If a man is 50 m above the ground, what is the longest time it could take him to get to the bottom?
9. physics

a basketball player achieves a hang time of 0.996 s in dunking the ball. What vertical height will he attain?
10. physics

Find the amount of work done by a labourer,who carries 'n' number of bricks of mass 'm' kg each to the roof of a house of height 'h'.
11. Physics

At the end of a race a runner decelerates from a velocity of 7.00 m/s at a rate of 0.500 m/s2. (a) How far does she travel in the next 14.0 s in meters?
12. physics

A certain car can go from 0 to 100 km/h in 10 s. If the engine delivered twice the power to the wheels, how many seconds would it take?
13. physics

if a todler is moving at 15m/s and covering a distance of 1900m. how much time does it take to cover this distnace?
14. physics

if a todler is moving at 15m/s and covering a distance of 1900m. how much time does it take to cover this distnace?
15. physics

if a todler is moving at 15m/s and covering a distance of 1900m. how much time does it take to cover this distnace?
16. physics

A 1.0kg ball initially at rest rolls down a plane at 35 degrees. pls i really need help
17. Physics

How long will it take a 1830 W motor to lift a 285 kg piano to a sixth-story window 16.0 m above?
18. physics

a pitches takes 0.10 seconds to throw a baseball, which leaves his hand at a velocity of 30m/s. the balls acceleration is?
19. physics

a pitches takes 0.10 seconds to throw a baseball, which leaves his hand at a velocity of 30m/s the ball's acceleration is?
20. Physics

A 3.0 cmm high object is placed 10 cm from a concave mirror whose radius of curvature is 10 cm. Where is the image located?
21. Physics

What minimum strength of magnetic field is required to balance the gravitational force on a proton moving at speed 6*10^6 m/s?
22. physics

Two asteroids, each with a mass of 6 million kilograms are attracted gravitationally with a force of 0.75 N. How far apart are their centers?
23. Physics

Approximately how long does it take for an oxygen molecule to diffuse across the interior of a cell that is 230 ì m in diameter?
24. physics

The specific heat capacity of pure water at 15.0 degrees celsius is 4184J/(kg.k). Convert this to kcal/(kg.k). pls help
25. physics

How much centripetal force is needed to keep a 0.20 kg ball on a 1.50 m string moving in a circular path with a speed of 3.0 m/s?
26. physics

How much centripetal force is needed to keep a 0.20 kg ball on a 1.50 m string moving in a circular path with a speed of 3.0 m/s?
27. physics

radius of the earth = 6.37 × 10^6 what is the speed of a 90.6 kg person at the equator? I know that F=m(v^2/r) but I don't know the force. Is there another equation that I'm missing or I'm using the wrong one? Thanks
28. physics

a hlicopter takes off and travles 300 km due north then returns to its landing field. what is its displacment?
29. physics

How long will it take a 1030 W motor to lift a 330 kg piano to a sixth-story window 13.0 m above?
30. physics

What is the minimum velocity needed for a roller coaster , traveling on the ground , to make it over a 112 m hill?
31. honors physics

What is the minimum velocity for a tolerant coaster traveling on the ground to make it over 112 m hill
32. science physics

i don't get how to solve this please help me Two resistors, 47 Ù and 82 Ù, are connected in series across a 45 V battery. What is the current in the circuit?
33. Physics

calculate the initial speed of a bicyclist whose final velocity is 20m/s if he accelerates at a rate of 2 m/s2 in 5 seconds?
34. physics

compute the least acceleration with which a man of mass 75 kg can slide down a rope which can sustain a weight of 580 N
35. physics

Time() 0 2 4 6 8 10 12 14 16 Velocity() 0 0 2 5 10 15 20 22 22 By measuring the slope of your curve, find the magnitude of the instantaneous acceleration at times = 9s i don't know how to solve it
36. physics

An airplane reaches a velocity of 71m/s^2 when it takes off. What must its acceleration be if the runway is 1.0km long
37. physics

Who developed modern periodic table? Descibe particle arrangements & movement for each phase of matter. (Thank you for helping me)
38. physics

An object is dropped from rest. What is its instantaneous speed when it has been in motion for 8 s? The acceleration of gravity is 9.8 m/s2 . Answer in units of m/s
39. College Physics

An electron and a proton are a distance r = 8.5 × 10-9 m apart. How much energy is required to increase their separation by a factor of 6?
40. physics

A 60kg boy is riding his bike to school. His acceleration is 15 m/sec^2. Determine the magnitude of the force he is exerting.
41. Physics- moles and gas laws

What is the volume occupied by 8.0 g of hydrogen under a pressure of 2.8 atm and a temperature of 300 K?
42. physics

When boiling water begins to turn to steam, which of the following remains the same in both the liquid and the vapor?
43. physics

When boiling water begins to turn to steam, which of the following remains the same in both the liquid and the vapor?
44. physics

An object is to be thrown through a window 3.5 m high a distance 7.5 m away. It is launched at an angle 70 degreesabove the horizontal.
45. physics

Why is there always a difference between the experimentally calcuated error for resistance, and the actual components tolerance value?
46. Physics

How much work is done by a girl weighing 450N while carrying a 2kg package up a 2m flight of stairs?
47. physics

5. An object that has kinetic energy must have A) momentum. B) acceleration. C) a force applied to it. D) All of these. E) None of these.
48. physics

5. An object that has kinetic energy must have A) momentum. B) acceleration. C) a force applied to it. D) All of these. E) None of these.
49. Physics

1. Explain how the ff. works: a. ultrasound imaging device b. photocopying machine c. microwave oven Thank you so much in advance! :)
50. principles of physics

Calculate the change in potential energy of 7.8 million kg of water dropping 50 m over Niagara Falls.
51. physics

jeritex mass is 60kg. if he climbs up the flight of stairs 13 meters high in 20 seconds, what is his power output?
52. physics

a race car's velocity increases from 4 m/s time interval, its average acceleration would be 10 m/s2 ? true or false ?
53. 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 ?
54. physics

If you pull one end of the rope 1.0 m downward with a 50 N force, find the height you can lift a 150 N load.
55. Physics

What is the magnitude of buoyant force acting on a 720 cm^3 toy submarine floating in fresh water? (D_water =1 g/cm^3)
56. Physics

Sunlight strikes a fused quartz surface. At what angle of incidence is the reflected light completely polarized?
57. Physics

What minimum speed does a 100 g puck need to make it to the top of a 5.9 m-long, 29 degree frictionless ramp?
58. physics

What is the power delivered by a motor lifting an elevator weighing 1250kg up 89 floors at 16.8 meters per second

Find the power input of a force F=(7 N)ˆý + (3 N) ˆk acting on a particle that moves with a velocity v = (6 m/s)ˆý. Answer in units of W
60. Physics

Our eyes are sensitive to electromagnetic radiation with wavelengths from 400nm to 700nm. What is associated range of frequencies?
61. physics

A motorcyclist increases her speed along a straight road from 0 to 120 km/hr in 5 seconds. How much acceleration does she experience
62. physics

The grid in a high-vacuume triode is usually kept negatively charged with respect to the cathode so that the electrons may be
63. physics

Which of these two bodies gets its internal heat from nuclear processes? A) Both.B) Sun.C) Neither.D) Earth.
64. applied physics

Calculate the magnitude of the torque produced by two 25N forces that are 3m apart and in opposite directions
65. Physics

A 0.5kg puck traveling in a horizontal circle of radius 3.2m has a frequency of 0.5Hz. what is the centripetal force on the cord?
66. Physics

What is the upper tripper point (UTP) of a comparator with hysteresis if R1 = 47 kÙ, R2 = 68 kÙ and the maximum positive output voltage is 10V?
67. physics

Determine the magnitude of the force of gravity acting on a 340 kg satellite, 850 km above Earth's surface
68. physics

Determine the magnitude of the force of gravity acting on a 340 kg satellite , 850 km above Earth's surface.

When a 0.35 kg baseball is hit, its velocitychanges from 21 m/s to -29.5 m/s. What is the magnitude of the impulse de-livered by the bat to the ball? Answer in units of N · s
70. 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?
71. physics

Devise a method for measuring the coefficient of friction between two surfaces using an inclined plane
72. Physics

Some hydrogen occupies 120 ft at 60.0°F. Find the temperature when its volume is 132ft^3 if the pressure remains constant.
73. Physics

Some propane occupies 150 cm^3 at 12.4°C. Find the temperature when its volume is 132ft^3 if the pressure remains constant.
74. physics

Some hydrogen occupies 120 ft at 60.0°F. Find the temperature when its volume is 132ft^3 if the pressure remains constant.
75. physics

Given that the power consumed by a device is 1000 W operating on a 70-V line, calculate the amount of current it draws.
76. physics

Given that the power consumed by a device is 1000 W operating on a 70-V line, calculate the amount of current it draws.
77. physics

How much work does a refrigerator with a COP of 3.8 require to freeze 660 g of water already at its freezing point?
78. physics help!

Using the Bohr model, estimate the wavelength ë of the Ká characteristic X-ray for a metal an atom of which contains Z = 50 protons.
79. physics

Using the Bohr model, estimate the wavelength ë of the Ká characteristic X-ray for a metal an atom of which contains Z = 50 protons.
80. physics

What frequency would you need to produce a sound wave in room-temperature air with a wavelength of 9 m? the answer in Hz
81. physics

Beats in sound are the result of which of the follwing wave? A) resonance.B) refraction.C) reflections.D) amplitude changes.E) interference
82. physics

The quality of a musical tone has to do with a variety of which of the following? A) amplitudes.B) sound speeds.C) intensities.D) decibels.E) harmonics.
83. physics

Sound waves have which of these properties? A) Reflection.B) All of these.C) Refraction.D) Interference.E) Capable of producing beats.
84. physics

is increasing the current a valid method to increase the induced voltage when a magnet moves into a solenoid?
85. Physics

An object is executing circular orbits of radius 0.5 m. If it completes an orbit every 3 seconds, what is its tangential speed?
86. Physics

Two persons A and B are walking with a speed of 4 km/h and 5 km/h respectively in the same direction. Find how far will B be from A after 3 hours ?
87. physics

How much charge passes through a cross-sectional area of a copper wire in 0.8 s if I = 3.5 A? 1 C -Work equation?
88. physics

A 2630-kg car drives up a hill 769 meters high in 41.0 seconds. Calculate the power exerted
89. Physics

Vector A has magnitude 37 units and direction, counterclockwise from east, of 12.9 degrees. What is the value of its x component to 1 decimal place?
90. physics

Calculate the cost of operating a 65 W light bulb continuously for a 30-day month when electrical energy costs \$0.23/kW·h. \$ 1
91. physics

what has more inertia?a toy car going 1000 mph or a cruise ship sitting at the dock
92. Physics

What magnitude of acceleration will result when 60N and 80N forces in opposite direction if applied to a 5kg body?
93. Physics

A 0.2 kg glass cup at 20 C is filled with 0.4 kg of hot water at 70 C. Neglecting any heat losses to the environment, what is the equilibrium temperature?
94. Physics

a truck is traveling in a straight line goes 60km in 83minutes. what is its average speed in km per hour?
95. physics

Wally now lift the box of the floor and put it on a shelf. Does he doing any work? If not why? If so .what energy change is accurring?
96. PHYSICS

A 60.0 kg rocket accelerates upward from rest reaching a height of 23.4 m in 3.0 seconds. what is the thrust force produced by the engine?