# Math/Physics

215,588 results, page 86
1. ## Physics

An airplane lands and starts down the runway at a southwest velocity of 43 m/s. What constant acceleration allows it to come to a stop in 1.2 km?Answer is in ___ m/s2.
2. ## Physics

Two planes approach each other head-on. Each has a speed of 765 km/h, and they spot each other when they are initially 11.0 km apart. How much time do the pilots have to take evasive action?
3. ## physics

A 350-Hz tuning fork is held above a closed pipe. Find the spacings between the resonances when the air temperature is 20°C.
4. ## Physics

Calculate the net charge on a substance con- sisting of a combination of 1.9 × 10^13 protons and 3.9 × 10^13 electrons. Answer in units of C.
5. ## physics

How far should and object be from a concave sperical mirror of radius 36cm to form a real image one-ninth it's size?
6. ## Physics

i spent so much time putting this equation together, but now I'm so confused solving for T 110 g x 4.816 J/g/C x (T-17)+31g x 0.385J/g/C x (T-300)=0 Can you help me
7. ## physics

A car accelerates uniformly from rest to a speed of 24.2 km/h in 5.1 s. Find the distance it travels during this time. Answer in units of m
8. ## Physics/Science

If a lever problem asks you to find a way to "lift" something, does that mean to balance the object(s), or to tilt it past the equilibrium?
9. ## physics

an airplane has a takeoff speed of 80 meters per second which it reaches 35 seconds after starting from rest. What is the minimum length of the runway?
10. ## Physics

If 500 grams of a metal requires 70 calories of energy to raise its temperature by 10 Kelvin, what is its specific heat?
11. ## Physics

at what distance would a convex magnifing lens that has a focal length of 10 cm have to be held for an image to appear upright and 3 cm tall? [6.67cm]
12. ## 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?
13. ## physics

What potential difference is needed to stop an electron having an initial speed of 3.70x 105 m/s? Answer in volts
14. ## 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
15. ## Physics

Calculate the net charge on a substance con- sisting of a combination of 1.9 × 10^13 protons and 3.9 × 10^13 electrons. Answer in units of C.
16. ## Physics

If it takes a particle in SHM 0.20 s to travel from the equilibrium position to the maximum displacement (amplitude), what is the period of oscillation?
17. ## Physics

Calculate the net charge on a substance con- sisting of a combination of 1.9 × 10^13 protons and 3.9 × 10^13 electrons. Answer in units of C.
18. ## Physics

An arrow is launched vertically upward from a crossbow at 98.2 m/s. Ignoring air friction, what is its instantaneous acceleration 4.20 s into the flight?
19. ## physics

Charge polarization is normally produced by ____________________. A) nuclear interactions.B) contact.C) induction.D) friction.E) electrostatic means.
20. ## Physics

A bomb explores in mid air into two equal fragments.what is the angle between their direction of motion? Ans:- 180°
21. ## Physics

Please help me with this question How much work is done by a boy of mass 70kg who ran up a flight of 31steps each15m high. Take g=10m/s^2
22. ## physics

a uniform plank of lenght 5m and a mass1kg support two masses of 500g and 300g . determine the centre of gravity
23. ## physics

What is the acceleration (in meters/second^2) of a freely falling 74.0 kg sky-diver, if air resistance exerts a force of 264 N?
24. ## Physics Project

I was wondering what would be some advantages of having a spherical shaped object travelling through air and/or water, as opposed to other shapes?
25. ## PHYSICS

IT TAKES YOU 9.5 MIN TO WALK AN AVREAGE VELOCITY OF 1.2 M/S TO THE NORTH FROM THE BUS STOP TO THE MUSEUM ENTRANCE. WHAT IS YOUR DISPLACEMENT?
26. ## Physics

1. What is happening to that air between the instruments and your ears? 2. How can you produce the change in the frequency? 3. Describe how the notes are produced in a violin?
27. ## Physics

A satellite is to be put into a circular low earth orbit at 149 km above surface. What orbital speed (km/s) is required?
28. ## PHYSICS

The velocity of a diver just before hitting the water is -8.7 m/s, where the minus sign indicates that her motion is directly downward. What is her displacement during the last 0.89 s of the dive?
29. ## Physics

Measurements can be described as accurate and/or precise. Define accuracy and precision and give examples of how those terms could be used to describe a measurement.
30. ## physics

a particle completes 4 revolution/sec on a circular path of radius 0.25m.calculate angular velocity
31. ## physics

If the 60-kg player is running forward at 7.0m/s when she makes contact with the dummy, what is the players velocity at the end of the 1.20s impact?
32. ## physics

to view full image of an object 160 cm high, the minimum size of the plane mirror required is?
33. ## Physics

By how much shoould a pair of light rays from a common source differ in length to produce destructive interference?
34. ## Physics 101

Consider two waterfalls, one twice the height of the other. The kinetic energy of each kilogram of water falling to the bottom of the taller waterfall is about?
35. ## 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
36. ## physics

Two positive charges of 6.83 µC each are 673 cm apart. Find the electric ﬁeld midway between them. The value of the Coulomb constant is 8.98755 × 10 9 N · m2 /C 2 .
37. ## physics

Calculate the time required for an astronaut to free-fall 50 m on the Moon. Please show and explain steps answer is 7.9s
38. ## physics

016 (part 1 of 2) 10.0 points A speedboat increases in speed from 17.9 m/s to 31.8 m/s in a distance 188 m. Find the magnitude of its acceleration.
39. ## physics

we just did an experiment on spectral fingerprinting and i was just curious, what if the elemental vapors were mixed in one discharge tube, how can i know what the individual elements are?
40. ## physics

a simple pendulum has a period of 2.0s and an amplitude of swing 5.0cm.calculate the maximum magnitude of the acceleration of the bob
41. ## physics

A 0.2 kg sponge is dropped from rest , pulled down by gravity. How fast will it be traveling in 6.0s , if a 0.5 N force of air resistance acts on it
42. ## Physics

What is the minimum work in joules needed to push a 1840 kg car 14.0 m up a 12.5 degree incline? (Ignore friction.)
43. ## physics

An athlete executing a long jumper leaves the ground at a 27.0 degree angle and travels 7.89 m. What was the takeoff speed?
44. ## Physics

Rain drops hitting the side window of a car in motion often leave diagonal streaks if there is no wind. Why?
45. ## physics

An object is dropped from a platform 400 ft high. Ignoring wind resistance, how long will it take to reach the ground?
46. ## physics

A sharp image is located 83.0 mm behind a 62.0 mm focal-length converging lens. Find the object distance by calculation.
47. ## 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?
48. ## Science Physics

You walk 30 m south and 30 m east. Find the magnitude and direction of the resultant displacement both graphically and algebraically
49. ## physics

By what length is a light ray displaced after passing through a 4.7 cm thick sheet of material (n=1.38) with an incident angle of theta = 33.5°.
50. ## physics

A police cruiser is travelling at 24 m/s and slows down at a rate of 0.65 m/s2 until it stops. The distance traveled by the cop while slowing down is closest to
51. ## Physics

It takes you 10min to walk with an average velocity of 1.2m/s to the north from the bus stop to the restaurant entrance. What is your displacement?
52. ## Physics

An object is thrown with speed of 17 m/s at an angle of 550. find the time it takes to reach its maximum height.
53. ## Physics

A soccer player launches a ball at an angle of 40 degrees, with an initial velocity of 23 m/s. What are the horizantal and vertical for this problem??
54. ## Physics- Help

Five forces act on an object. (1) 63 N at 90° (2) 40 N at 0° (3) 75 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?
55. ## PHYSICS:

A boy weighing 350N runs up a flight of stairs consisting of 20 steps each 10 cm high in 10 seconds.what is his power?
56. ## physics

Show that 480 W of power is expended by a weightlifter when lifting a 60-kg barbell a vertical distance of 1.2 m in a time interval of 1.5 s.
57. ## physics

By what length is a light ray displaced after passing through a 4.7 cm thick sheet of material (n=1.38) with an incident angle of theta = 33.5°.
58. ## physics

A ball is thrown directly downward with an initial speed of 8.95 m/s, from a height of 29.0 m. After what time interval does it strike the ground?
59. ## College physics

A skier traveling at 30.9 m/s encounters a 21.5 degree slope. If you could ignore friction, to the nearest meter, how far up the hill does he go?
60. ## 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.
61. ## principles of 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 ____________________. A) 0.5 m/s. B) 1 m/s. C) 1.5 m/s D) 2 m/s E) 2.5 m/s.
62. ## Physics

A student travels 6.0 m [E] in 3.0 s and then 10.0 m [N] in 4.0 s. Draw a vector diagram to determine the resultant displacement. Q: How do you know where the starting point is on the graph?
63. ## physics

A man walked 5cm east and 10cm north calculate the distance covered and the magnitude of his displacement
64. ## physics

A wooden cube of side 10cm has mass 700g.What part of it remains above the water surface while floating?
65. ## physics

Calculate the average velocity for a remote controlled vehicle that starts with a speed of 1.0 m/s [forward] and then accelerates at 0.08 m/s2 [backward] for 4.0 s.
66. ## Science (physics)

A powerful motorcycle can accelerate from rest to 28 metre per second in only 4 seconds what is the average acceleration? How far does it travel in that time
67. ## Physics

When an objects acceleration is 0 at an instant t in time, its velocity is 1. zero at t. 2. negative at t. 3. positive at t. 4. not changing at t. My teacher never taught us this, can someone help me figure it out?
68. ## physics

a fan rotates speed of 600rev per min the power is cut it stopped after 60 rev find time
69. ## PHYSICS

What is the direction (vertical or horizontal) of the transmission axis of Polaroid sunglasses? Give the physical reason for your answer.
70. ## Physics

A Ferris wheel has a radius of 14 m. What period of rotation would give the occupants a feeling of "weightlessness" at the top? __s
71. ## physics

if a 400g ball moving 1.2 m/s [north], receives an impulse that changes its direction and speed to 2.8 m/s [east], what is the change of momentum?
72. ## 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?
73. ## Physics

A 16-kg child sits on a 5-kg sled and slides down a 143-meter, 30-degree slope, to the nearest m/s what is his or her speed at the bottom?
74. ## Physics projectile

If a body projected vertically upwards, give a graph showing variation in its kinetic energy
75. ## Physics- Help

Five forces act on an object. (1) 63 N at 90° (2) 40 N at 0° (3) 75 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?
76. ## physics

During an Olympic bobsled run, the Jamaican team makes a turn of radius 7.9 m at a speed of 97.4 km/h. What is their accelaration in g-units?
77. ## physics

Find the limiting velocity of a rain drop assuming diameter of 5.0×10^-4m.The density of air relative to water is 1.3×10^-3
78. ## Physics

Can someone help me with finding out the magnitude of the gravitational force a person with a mass of 67.5 kg would experience while standing on the surface of Earth? Thanx in advance.
79. ## Physics- Help

Five forces act on an object. (1) 63 N at 90° (2) 40 N at 0° (3) 75 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?
80. ## physics

32 kg child practicing rock climbing, she feel but the rope hung on with a tension of 253N. find acceleration??
81. ## Physics

Problem 3- If a bug can jump straight up to a height of 0.5 m. a) what is its initial speed as it leaves the ground? b) How long is it in the air?
82. ## Physics

A golf ball is struck with a five iron on level ground. It lands 85.0 m away 4.60 s later. What was the magnitude and direction of the initial velocity
83. ## Physics

If a projectile is fired straight up at a speed of 10 m/s, the total time to return to its starting position is about ? When I use the quadratic formula, I get -8.97
84. ## PHYSICS

What is the direction (vertical or horizontal) of the transmission axis of Polaroid sunglasses? Give the physical reason for your answer.
85. ## Physics

How much work did the movers do horizontally pushing a 160-kg crate 10.3m across a rough floor without acceleration, if the coefficient of friction was 0.50?
86. ## physics

A car accelerates uniformly from rest to a speed of 21.5 km/h in 6.9 s. Find the distance it travels during this time. Answer in units of m
87. ## Physics

Find x and y components of a vector which is 10 units in length and 40 degrees below the +x axis. I honestly don't even know how to begin this problem .. Please help me !
88. ## physics

A softball bat is rotating at 460 rotations per minute at contact with the ball. What is the angular velocity in radians?
89. ## Physics

A bullet fired target loses half of it velocity in penetrating 15cm .how much further it will penetrate before coming to rest
90. ## Physics

The velocity of a diver just before hitting the water is -8.7 m/s, where the minus sign indicates that her motion is directly downward. What is her displacement during the last 0.98 s of the dive?
91. ## Physics

What should the theoretical maximum value of the uniform acceleration of a object freely rolling down an inclined plane and what would the angle of elevation be?
92. ## physics

If a trapeze artist rotates once each second while sailing through the air and contracts to reduce her rotational inertia to one-third of what it was, how many rotations per second will result?
93. ## physics

The pendulum swings past the pole 14 times in 21 seconds. The weight of the bob is 10g. Calculate the period?
94. ## physics

a car travelling at 60km/h uniformly retards for 10s and reaches a velocity of 45km/h. find the retardation.
95. ## physics

If Vx= 8.00 units and Vy= -6.40 unis, determine (a)the magnitude and (b)direction of ->V(vector) b) theta= ______ degrees below the positive x-axis.
96. ## physics

A person is kayaking in the ocean at 5.6 m/s 75° to the horizon when he experiences a current of 3.8 m/s 45° south of west. What is the speed and direction of his kayak?
97. ## Physics - Help!

All, Please just help me in this, I will need you to please give me the clue-thanks. a flashlamp bulb is marked '2.5V,0.30A' and has to be operated from a dry battery of e.m.f 3.0V for the current p.d. of 2.5V to be produced across it. Why?
98. ## physics

A piano wire has length L and mass M. If its fundamental frequency is f, its tension is: i got T=(lambda*f)^2m/L, but their answer is 4LMF^2 and i cant figure out how to get that
99. ## physics

A football is thrown upward at a 30 degree angle to the horizontal. To throw a 40.0-m pass, what must be the initial speed of the ball?
100. ## physics

A moto of a crane is lifting a 100 kg load 20m high using 25 kj of electrical energy. calculate the efficiency