# Math/Physics

215,588 results, page 71
1. ## physics

a cricket ball is takes 3 sec to reach the maximum height its initial velocity is???
2. ## Physics

2point charges of 1mc & 4mcr places 0.15m apart find the null point between them..?
3. ## Physics

Forces of 9.5 N and 5.12 N act at right angles on a reddish-green block of mass 3.19 kg. How much acceleration occurs?
4. ## Physics

Two negatively-charged bodies with -5.4e-5 C are 0.20 m from each other. What force acts on each particle? F=kqq/d^2 F=(9.0e9)(q)(q)/(.20^2) Would both q's equal -5.4e-5 C?
5. ## physics

find the altitude change of a 10000-kg fighter which clims and in so doing, loses 100 m/s of airspeed
6. ## physics

with a cart of unknown mass, could you still determine whether its total energy is conserved? explain your reasoning
7. ## Physics II

find the pressure at the bottom of a vessel 76cm deep when filled with a) water b)mercury (sp.g. 13.6)
8. ## Physics

To what potential a sphere of radius 10cm be charged so that the surface density of charge is equal to 1
9. ## Physics

The hamiltonian shows you that the energy levels are purtered by the electric fields.The form of the matrix,you can see?
10. ## 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?"
11. ## physics

A cars starts from rest and after 20 seconds its velocity becomes 108 km-1 find the acceleration of the car
12. ## physics

A boy hops on his bike and rides 135 meters in 20 seconds. What is his average speed?
13. ## Physics

An object with a mass of 3kg is dropped from 56.3 meters. How far above the ground is it's kinetic energy 1073J?
14. ## Physics

If a man weighs 900 N on the earth, what would he weigh on jupiter, where acceleration due to gravity is 25.9 m/s^2?
15. ## Physics

What coefficient of friction is required to stop a hockey puck sliding at 12.8 m/s initially over a distance of 66.5 m?
16. ## physics

A boy hops on his bike and rides 135 meters in 20 seconds. What is his average speed?
17. ## 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?
18. ## Physics

A car travels in a straight line for 3.9 h at a constant speed of 83 km/h . What is its acceleration? Answer in units of m/s2
19. ## Physics

How much force is required to accelerate a 1500kg car to a speed of 17m/s in a distance of 45m? Thank you.
20. ## physics

A ball is thrown off a 30 m high cliff at 2 m/s, 50 degrees above the horizontal. How long does it take to hit the ground?
21. ## physics

A car traveling at 60km/h. It then accelerates at 3.6m/s^2.How long does it take to reach a new speed. How far does it travel during acceleration.
22. ## physics

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

How will the weight of a 20kg object change if it was in a lift that accelerates downward at 4 meters per second squared?
24. ## Physics

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

How much potential energy is required to lift a 50 gram arrow to a height of 100 meters?
26. ## Intro to Physics

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

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

a 333 hz and 337 hz tuning forks are struck simultaneously. whats will be the beat frequency?
29. ## 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?
30. ## physics

light from the sun travels 1.5x10km to reach the earth .how long does it journey take in minutes?
31. ## Physics check

Atoms whose nuclei have the same number of protons but different numbers of neutrons are called.... isotopes?
32. ## College physics

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

A car travels in a straight line for 5 h at a constant speed of 73 km/h . What is its acceleration? Answer in units of m/s2
34. ## physics

determine the velocity and kinetic energy of neutrons having de broglie wave length 1 angstrom
35. ## PHYSICS HELP

1 1200kg car is accelerating at 1.6m/s/s. If the coefficient of friction is .15, what is the force supplied by the engine? please help! urgent!
36. ## Physics

Calculate the resistance of a 900 watt toaster operating at 120 volts. Which formula do you use?
37. ## physics

A car travels in a straight line for 2.8 h at a constant speed of 53 km/h . What is its acceleration? Answer in units of m/s 2
38. ## 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
39. ## Physics

How much time does it take for a car to come to rest if it has an initial speed of 22m/s and slows with a deceleration of 6.1 m/s^2 Will my answer be 3.6 m/s^2
40. ## physics

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

A 50kg person standing on both feet cover a surface about 13 cm x 12 cm. How much pressure is on the sole of their shoes?
42. ## Physics

How far from the center of the earth must a person be located in space so t hat his/her weight would be the same as when he/she is standing on the moon?

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.
44. ## 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?
45. ## physics

suppose you apply 3 newtons of force to slide a box 2 meters in 6 seconds, how much work did you do?
46. ## physics

Describe how the energy from a rotating flywheel can be transferred to moving parts of a child's toy.
47. ## 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?
48. ## 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.
49. ## PHYSICS

the following data were obtained for the position of a ball as it rolled along a straight track DISPLACEMENT (CM) TIME 2.90 0.60 7.40 2.10 11.00 3.30 22.70 7.20 31.10 10.00
50. ## physics

If you dropped the ball, cylinder and the ring at the same time from a height of 6.35 cm, in what order would the hit the ground?
51. ## mathematical method of physics

expand 3sin(4x)+4cos(10x) in to functional series of e(exp)ix
52. ## physics

if a pitcher throws a ball at 101 mph and it trvels 60.5 feet. How much wiil it drop?
53. ## 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?
54. ## Physics

An airplane lands and starts down the runway at a southwest velocity of 41 m/s. What constant acceleration allows it to come to a stop in 1.3 km?
55. ## physics

What is the longest wavelength for a standing wave, in the same length tube, that is open at one end and closed at the other?
56. ## Physics

What coefficient of friction is required to stop a hockey puck sliding at 12.8 m/s initially over a distance of 66.5 m?
57. ## physics

If I threw a ball vertically at an initial speed of 34.5 m/s, how many seconds would it take to reach its maximum height?
58. ## physics

A car traveling at 70 km/h. It then accelerates at 3.6m/s^2 to 90km/h. How long does it take to reach a new speed. How far does it travel during acceleration
59. ## conceptional physics

If a 35cm radius tire spins at a rate of 72 rad/s what is the rotating speed?
60. ## physics

Why does a conductor carrying current experiences force when held in a magnetic field at right angles to it?
61. ## physics

If an 80kg sprinter can accelerate from a standing start to a speed of 10 m/s in 3s, what average power is generated
62. ## physics

What is the period of the hand on a clock that measures the minutes? What is the frequency? Please show work, Thank you, Abbie
63. ## physics

if a pitcher throws a ball at 101 mph and it trvels 60.5 feet. How much wiil it drop?
64. ## PHYSICS

he following data were obtained for the position of a ball as it rolled along a straight track DISPLACEMENT (CM) 2.90 7.40 11.00 22.70 31.10 TIME 0.60 2.10 3.30 7.20 10.00
65. ## physics

When a transverse wave on a string is reflectred from the free end the phase change produced is-------
66. ## Physics, Help!! URGENT!!!

A sprinter must average 24.0 mi/h to win a 100-m dash in 9.30 s. What is his wavelength at this speed if his mass is 84.5 kg?
67. ## Physics

A car travels in a straight line for 2.9 h at a constant speed of 77 km/h . What is its acceleration? Answer in units of m/s^2
68. ## physics

It two objects are thrown off a tall building and one is three times the mass of the other, do they hit the ground at the same time?
69. ## Physics

A car travels in a straight line for 4 h at a constant speed of 63 km/h. What is its acceleration? Answer in units of m/s^2?
70. ## Physics

If U-238 splits into two even pieces, and each piece emits an alpha particle, what elements are produced?
71. ## Physics

I am curious how the earth work as an omnipresent conductive surface in an electrical distribution system?
72. ## Physics

How many moles are there in a 30 cm diameter basketball at a pressure of 160 kpa and temperature of 25 degree celcius.
73. ## physics - drwls?

The flywheel of a steam engine runs with a constant angular speed of 250 rev/min. When steam is shut off, the friction of the bearings stops the wheel in 2.1 h. At the instant the flywheel is turning at 75 rev/min, what is the tangential component of the
74. ## Math/Physics

The velocity v of a particle moving in the xy plane is given by v = (6.0t - 4.0t2) i + 4.0 j, with v in meters per second and t (> 0) is in seconds. What is the acceleration when t = 3.0 seconds? When is the acceleration zero? When is the velocity zero?
75. ## Physics

Trying to beat the heat of summer, a physics grad student went to the local toy store and purchased a child's plastic swimming pool. Upon returning home, he filled it with 154 liters of water at 25°C. Realizing that the water would probably not be cool
76. ## Math/Physics

An electron's position is given by r = 4.00t i - 6.00t^2 j + 5.00 k, with t in seconds and r in meters. In unit-vector notation, what is the electron's velocity? (Answer in terms of i, j, k, t.)What is v in unit-vector notation at t = 8 seconds? What is
77. ## English Grammar

He is a math teacher. He is a Math teacher. Do I have to capitalize Math or not? are both OK?
78. ## Physics

1) A physics book is moved once around the perimeter of a table of dimensions 1 m by 3 m. What is the distance traveled? 2) A window washer drops a brush from a scaf- fold on a tall office building. What is the speed of the falling brush after 2.7 s?
79. ## sat essay

Is it necessary for us to find new solutions to problems? Many people may argue that we don¡¯t need to since we are already able to solve the problems. As far as I am concerned, we should always try to find new solutions to problems. New solutions enable
80. ## math

During one school year, Billy Bob earned \$25 for each Math test he passed and was ined \$50 for each Math test he failed. By the end of the school year, Billy Bob passes 7 times as many Math tests as he failed and he had a total of \$375. How many tests did

Chris has made the following grades on five math test. 90,74,86,75,94 What score must Chris earn on the next math test to have a test average of exactly 85?
82. ## Physics

This is a question related to work. Today we had a pop quiz in my physics class and I am just trying to check my work here :D 1) if there is a 5 kg block on a horizontal table connected with string to a 3 kg block hanging off the side of the table through
83. ## Math

I'm studying to take a math placement exam and it has been a long time since I've taken a math class. Can someone please give me a step to step solution of these: A.Simplify: 8x/[2^(x-1)] Answer = 2^(2x+1) B.Simplify: (2^x)*[4^(x-1)] Answer = 2^(3x-2)
84. ## Math

If I spend t hours every night on my homework and 1/4 of the time studying math, what equation can I write to represent the number of hours I will spend doing my math homework during the next 5 days?
85. ## Physics

Just before your mountain bike ride, you eat a 240 Calorie exercise bar. (You can find the conversion between food Calories and Joules in the People’s Physics chapter and several references online.) The carbon bonds in the food are broken down in your
86. ## Physics

we are doing a really dumb websearch in my Physics class on roller coasters and I really need help with like 5 problems! For the websearch I need to cite it so if you could provide any answers I also need the website! thanks in advance!!! Q's 8. If you
87. ## physics bob

still i cant find the normal force without mass of automabile. is normal force mass times gravity sin theta? on a level road the stopping distance for an automobile is 35.0m for an initail speed of 90 km/hr what is the stopping distance of the same
88. ## Physics

Once a favorite playground sport, dodgeball is becoming increasingly popular among adults of all ages who want to stay in shape and who even form organized leagues. Gutball is a less popular variant of dodgeball in which players are allowed to bring their
89. ## statistics

Lilly collects data on a sample of 40 high school students to evaluate whether the proportion of female high school students who take advanced math courses in high school varies depending upon whether they have been raised primarily by their father or by
90. ## statistics

Lilly collects data on a sample of 40 high school students to evaluate whether the proportion of female high school students who take advanced math courses in high school varies depending upon whether they have been raised primarily by their father or by
91. ## Physics .. hard problem

An overly eager physics student wants to confirm that the acceleration of gravity is ag=9.8 m/s^2. To check this, the student steps off the roof of the Sears Tower (height at the sky deck 427m). The rocketeer (who arrived five seconds after the student

A system does 210 J of work on its environment and gains 80.6 J of heat in the process. Find the change in the internal energy of (a) the system and (b) the environment. Physics(Please respond) - Elena, Thursday, June 21, 2012 at 2:33am ÄU = Q - W Where
93. ## physics multiplying vectors

n the product F = qv · B , take q = 4, = 2.0i + 4.0j + 6.0k and = 136i -176j + 72k. What then is in unit-vector notation if Bx = By? ~~may i get some assistance in this problem? so far.. i tried this.. 136i-176j+72k = 4(2.0i+4.0j+6.0k)(B) 136i-176j+72k =
94. ## Physics

Physics Homework _____________________________________________________________ 1.) A particle at t 1 = -2.0 s is at x 1 = 3.4 cm and at t 2 = 4.5 s is at x2 = 8.5 cm. What is its average velocity? Can you calculate its average speed from this data?
95. ## Physics- Mastering Physics

Predict how the range of the projectile will change when you change the angle from 45∘, keeping the speed constant. A The range increases with increase in angle and decreases with decrease in angle. B It increases with either an increase or decrease
96. ## physics

Find the force of gravity (in newtons) on a spacecraft 15100 km above the earth's surface, if its mass is 400 kg
97. ## 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?
98. ## Physics

How far will a car travel if it starts from rest and experiences an acceleration of magnitude 3.75m/2^2 forward for 5.65 s? Answer is 59.9m
99. ## physics

Question Part Points Submissions Used A bus slows down uniformly from 75.0 km/h (21 m/s) to 0.0 km/h in 220 m. How long does it take to stop?
100. ## Physics

How far will a car travel if it starts from rest and experiences an acceleration of magnitude 3.75m/2^2 forward for 5.65 s? Answer is 59.9m