# Math/Physics

214,413 results, page 53

1. ### physics

What must be the magnitude of the force of static friction between the surface and the bottom of the crate?
2. ### physics

a ball is thrown vertically upward at a speed of 45 m/s. how long does it take to return to the ground?
3. ### Physics

You have a circular table. You measured its radius to be 10 cm with an uncertainty dr =+/- 3mm. The area would be A +/- a cm^2. a. What is A? b. What is a?
4. ### Physics

You have a circular table. You measured its radius to be 10 cm with an uncertainty dr =+/- 3mm. The area would be A +/- a cm^2. a. What is A? b. What is a?
5. ### PHYSICS

how far will a 1000kg car travel in 10 sec if it is accelerated from rest by a force of 5000N
6. ### physics

Determine the net force needed to cause a 1310kg sports car to accelerate from 0 - 28.6m/s[fwd] in 5.6 s
7. ### physics

A plane cruising at 251 m/s accelerates at25 m/s2 for 9 s.What is its final velocity?Answer in units of m/s
8. ### Basic Physics

If a swimming pool has dimensions; 28.2 5m x 10.0m x 2.30m, when it is full of water, what is the force on the bottom ?
9. ### physics

A spring has a force constant of 70000 N/m. How far must it be stretched for its potential energy to be 21 J?
10. ### physics

what will happen to the bone structure if earth becomes more dense than its actual density?
11. ### physics 11

By how much would 1200 W kettle, which is 72% efficient raise the temperature of 0.60 kg of water in 3.0 min?
12. ### physics

what has no beginning and no end. it is also considered as the medium for light in einstein's theory of relativity
13. ### physics

An argon atom has a mass of 6.64 x 10 kg has 5.5x108 joules of kinetic energy. At What velocity is it moving?
14. ### physics

calculate the friction force of an object? if weight=19600,vi=30ms-1,vf=0ms-1 and S=100m.
15. ### physics

if a car moving 180km/h reduces to 72km, what is the percentage change in kinetic energy?
16. ### Basic Physics

What is the force of gravity between two spheres that have a mass of 8 kg and are separated by 27 m?
17. ### physics

find the force if f between charges of +100mc -50mc located 50cm a part?
18. ### physics

find the force if f between charges of 100mc -50mc located 50cm a part?
19. ### physics

what is the kinetic energy of a 3 kg 20 cm diameter bowling ball with a linear velocity of 4m/s? (rolling and spinning)
20. ### physics

the magnitude of the tongue produced by a 3.0n force applied to a door at a perpendicular distance of 0.25 m from the hinge
21. ### Physics

How many joules would be required to raise the temperature of 20g of ice at oC to water at15C?
22. ### physics

An equipotential surface that surrounds a point charge q has a potential of 516 V and an area of 1.01 m2. Determine q
23. ### Physics

A jeep has a speed of 50 m/s at a given instant and 10 m/s later. fin its retardation, assuming it to be constant.
24. ### physics

A jet travels at 435 m/s. How long does it take to travel 253 m? Answer in units of s
25. ### Physics

How much work is needed to stop a 20g bullet moving with a speed of 150ms-1
26. ### Physics

Find the length of a simple pendulum that completes 16.0 oscillations in 52.0 s. CAN YOU PLEASE EXPLAIN SPECIFICALLY , THANK YOU!
27. ### physics

what is meant by the change go temperature of 1 degree celcius on the scale of a plantinum resistance thermometer
28. ### physics

How long does it take light to travel through a 3.3 mm-thick piece of window glass?
29. ### physics

a frieght train rolls at the same speed but has twice as much mass its momentum is
30. ### physics

What magnitude point charge creates a 13000 N/C electric field at a distance of 0.220 m?
31. ### Physics

A downward force of 5.1 N is exerted on a -7.3 mcirco C charge. What is the magnitude of the electric field at this point?
32. ### Physics

What is the electrostatic force between two ballons, each having 0.000005 C of charge, when they are 0.5 m apart?
33. ### Physics

A person stands 2.0 m away from the reflecting surface of a plane mirror. What are the image characteristics?
34. ### physics

If a protonand an electron are released when they 2.0X10^-10m apart, find the initial accelerationof each of them. I know a=ke^2/mr^2 k = 8.99 x 10^9 e = 1.6 x 10^-19 r = 2.0x 10^-10 so what is the m ????
35. ### physics

An equipotential surface that surrounds a point charge q has a potential of 590 V and an area of 1.20 m2. Determine q.
36. ### Physics

what is the average force needed to stop a car (1000kg) traveling 28m/s in 55m?
37. ### physics

the force required to maintain an object at a constant velocity in free space is eaqual to?
38. ### Physics

What can we say about the force of an object when the mass increases and acceleration remains constant?
39. ### physics

what is the height of the ball if the bottom of the swing is zero, speed is 2.8m/sec, 9.81 acceleration of gravity
40. ### physics

When a transverse wave on a string is reflectred from the free end the phase change produced is-------
41. ### physics

What would the gravitational potential energy be if the bucket were raised six times as high?
42. ### physics

Calculate a person's hang time if he moves horizontally 2 m during a 1.39 m high-jump.
43. ### Physics

How can we find the resultant force if the mass and SPEED are given?? Give me the formula please!!
44. ### physics

A particle starts moving with acceleration 2 m/s2. distance travelled by it in 5th half second is..??
45. ### physics

Consider a concave mirror with radius R. An upright object is placed in between the interval R/2 and R. R
46. ### physics

a 125 cm long string has a mass 2.0g and it is stretched with a tension of 7.0 IN between fixed support
47. ### Physics

The magnification of an object 2km tall where placed in 150m in front of a plane mirror is ?
48. ### Physics

Calculate the work required to be done to stop a car of 1500kg moving with a velocity of 60km/hr?
49. ### conceptional physics

If a 35cm radius tire spins at a rate of 72 rad/s what is the rotating speed?
50. ### Physics "scientists"

* JJ Thomson * a) How does his experiment of cathode ray tube relates to electrostatics? >> PLEASE HELP ME!! :( :)
51. ### Physics

So if mgh=1/2mv^2 and I'm solving for v is my answer going to be v= squareroot of 2* (gravity) 9.8m/s^2* (height) 3.67m?
52. ### physics

2. Determine the theoretical yield of aspirin if you started with 2.500 grams of salicylic acid?
53. ### physics

problem E2_2 Strain, boundary conditions, displacement and elongation: Part I Plz help.
54. ### Physics

How long does it take to deliver 315 J of energy to 0.850 cm^2 of a wall that it hits perpendicularly?
55. ### physics

You can paddle at 4.5 km/h and the river is ﬂowing at 3 km/h. How far downstream will you be in 44 min? Answer in units of km
56. ### physics

How long does it take light to travel through a 2.7 mm-thick piece of window glass?
57. ### Physics

2. How many oxygen atoms are indicated on the right side of this balanced chemical equation? 4 Cr(s) + 3 O2( g)h2 Cr2O3( g)
58. ### Physics

A fuel has heat of combustion equal to 30 kJ / g. How much energy is released when 5 kilograms are oxidized?
59. ### Physics

Which of the following is the correct relationship between the electric field strength and the potential difference?
60. ### physics

describe with the aid of a fully labelled diagram the features and their uses of a bicycle pump
61. ### physics

A car covers a distance of x,while moving at 54km/1 in 15sec.Find the value of x
62. ### physics

What is the radius of an automobile tire that makes a complete turn in 0.1 sec and has a linear speed of 24.0 m/s?
63. ### Physics

What is the circular force of a 150 g yoyo swung around on a 1.00 m string at a velocity of 5.0 m/s (in Newtons)?
64. ### physics

what is meant by liquefaction of gases? can hydrogen be liquefied by compression at the temperature of liquid air?
65. ### physics

a polar satellite is launched at 850 km above Earth .find its orbital speed.
66. ### physics

If I have 1.5 moles of an ideal gas at a pressure of 3 atmospheres and a volume of 7 liters, what is the temperature?
67. ### Physics

A meteoroid is speeding through the atmosphere, traveling east at 23.1 km/s while descending at 18.3 km/s. What is its speed, in km/s?
68. ### Physics

Air in a balloon does 50 J of work while absorbing 70 J of heat.What is its change in internal energy?
69. ### PHYSICS

How much heat must be added to 1.0 kg of iron to raise its temperature from 20°C to 95°C? (ciron = 0.11 cal/g•°C)
70. ### physics

if a bus travels north with a constant velocity of3m/s, what is the displacement after 15 seconds?
71. ### physics

a 1000 kg car with an average power of 100 kw accelerates from 0 to 50 m/s. how long does it take to accomplish this
72. ### physics

75 kg block is dropped from a height of 6 m. How much kinetic energy does it have when it has fallen halfway?
73. ### physics

how much work is needed to stop a 20g bullet moving with a speed of 150 ms-1
74. ### Physics

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

(a) How many kilograms of water must evaporate from a 60.0 kg woman to lower her body temperature by 0.750°C?
76. ### Physics

a racing car has a uniform acceleration of 4 m/s2 What distance will it cover in 10secs after its start
77. ### Physics

What electromagnetic waves are dangerous for humans and why? I have microwave, xrays....can you help name a few
78. ### Physics

A stone is thrown vertically upward with a speed of 19.0m/s How fast is it moving when it reaches a height of 10.0m
79. ### 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?
80. ### physics

Find the field produced by a uniformly charged sheet carrying 93pC/cm2 .
81. ### Physics

What is the direction of force of friction on a bicycle on front and back wheel while paddling?
82. ### physics

A body immersed in liquid has an upthrust of 140N with a density of 12kg calculate the velocity
83. ### Physics

A car starts from rest and accelerates for 3.9 s with an acceleration of 5 m/s2 . How far does it travel? Answer in units of m
84. ### physics

A meteoroid is speeding through the atmosphere, traveling east at 24.5 km/s while descending at 11.6 km/s. What is its speed, in km/s?
85. ### Physics

What is the car's forward acceleration,at a speed of 30m/s,when the driving force on the wheels is 650N
86. ### physics

A meteoroid is speeding through the atmosphere, traveling east at 19.5 km/s while descending at 12.7 km/s. What is its speed, in km/s?
87. ### physics

calculate the linear momentum of a truck with a mass of 13065kg that is traveling at 36m/s eastward.
88. ### Physics

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

Show that the magnitude of the charge on a capacitor is given by Q = (Qo(1-e^-(t/T))) and Q = Qoe^-(t/T) for charging and discharging, respectively.
90. ### physics

With V = Voe^-(t/T), how many time constants does it take for a capacitor to discharge less than 1% of its initial voltage?
91. ### physics

How much work does a student do if he throws a 0.750 kg ball with force of 45.0 N through a distance of 1.50 m?
92. ### Physics

What is the kinetic energy of a 1100 kg sports car traveling down the road with a speed of 22 m/s?
93. ### physics

What is the charge of a bare Magnesium nucleus (no electrons, just the protons and neutrons) in Coulombs?
94. ### physics

on a cool night with no wind people facing a campfire feel a breeze on their backs. why?
95. ### Physics

coin and a piece of glass are both heated to 60 degrees celsius which will be warmer when you touch it ?
96. ### Physics

Why do some cooks put long aluminum nails through potatoes to be baked?
97. ### Physics

coin and a piece of glass are both heated to 60 degrees celsius which will be warmer when you touch it ?
98. ### Physics

Why do some cooks put long aluminum nails through potatoes to be baked?
99. ### physics-

In a string and pulley problem, will friction increase or decrease the tension.can you please explain if you can?
100. ### Physical Science

What are the noninvasive benefits of the medical technologies that rely on physics of elementary particles?