# Math/Physics

215,876 results, page 50
1. ## 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.
2. ## Physics

What angle should you rotate a mirror so that a reflected ray rotates through 28 degrees. I got 20, but i am not sure, please help
3. ## Physics

What is the fundamental frequency on a 5 m rope that is tied at both ends if the speed of the waves is 24 m/s?
4. ## physics

An 80 kg skateboarder going 10 m / s is launched nearly vertically off a ramp as shown. Approximately how high does he go?
5. ## physics

Find an expression for the energy densityin terms of stress and strain.
6. ## physics

A ball is dropped from the roof of a building. How much time does it take to reach a velocity of 15.4 m/s?
7. ## Physics

A ball is thrown downward at 12.3 m/s. How much time does it take for it to reach the ground, 182.6 m below?
8. ## physics

what impulse is needed to slow a 45kg object from 15m/s to 12m/s?
9. ## physics

5. What is the acceleration of a 20 N object that is pulled up a 30° incline by a 25 N force? The coefficient of friction is 0.30.
10. ## physics

ifv=(3i+4j+5k)m/s is the instantaneous velocity of a body mass 1.50kg calculate its K.E
11. ## Physics

Two point charges of magnitude 2.0 X 10^-7 C and 85 X 10^-8 C are placed 12 cm apart .What is the field intensity of each charge at the site of other ?
12. ## physics

how does temperature affect the time it takes to reach thermal equilibrium?
13. ## physics

which of acceleration age speed temperature and velocity are vector quantities
14. ## physics

what is the kinetic energy of a 200 g bullet travelling at a velocity of 400 m/s?
15. ## Physics

If a racehorse starts from rest and accelerates at a rate of 4.7 m/s2, how long does it take the horse to go 20 m?
16. ## physics

A ball is dropped from the roof of a building. How fast is it moving after 4.6 seconds?
17. ## physics

What is the magnitude of the acceleration of a sprinter running at 9.0 m/s when rounding a turn of a radius 26 m?
18. ## Physics

Let U=(13i3−i). What is U†? Explicitly indicate multiplication with a * symbol. For instance, you should write 3*i+2 instead of 3i+2.
19. ## physics

What force is needed to accelerate a child on a sled (total mass = 60 kg) at 1.25 m/s2?
20. ## 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?
21. ## Physics

Identify the correct neutrino (Ve, Vµ, Vτ or their anti-particles) a) π+ —> p° + e+ + v b) π+ —> p° + µ+ + v c) τ+ —> e- + v + v Please explain why too...I'm really lost. I'd appreciate any help.
22. ## Physics

A vibrating point on a spring travels 60 mm during three cycles. What is the amplitude of the vibration?
23. ## Physics

how much heat is needed to vaporize a 400.0 g of liquid water at 310.0 K?
24. ## physics

How will changing the distance change the electric field strength for a given charge?
25. ## physics

If the electron experiences a force of 5.6 x 10-6 N, how large is the field between the deflection plates?
26. ## 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?
27. ## physics

find the %error in the measurement of refractive index of glass. the values was 1.54,1.53,1.44,1.54,1.56& 1.45.
28. ## Physics

If a car increases its speed from 5 m/s to 25 m/s over 40 seconds. what is the acceleration? Give the unit.
29. ## physics

why it is easier to tear a paper off a full roll than a mostly used one? Is it because of Newton's law?
30. ## physics

The acceleration of a certain rocket is given by a=bt where b is positive cnstant, find the position function Xo and Vo at t=o?
31. ## physics

10 kg of ice at -4 C is dropped into 15.1 kg of water at 36 C. What is the final temperature of the mixture? T_final =
32. ## physics

How will changing the charge change the electric field strength at a distance?
33. ## physics

find the moment of inertia of the earth. Radius is 6,000 km and mass is 6 x 10^24 kg
34. ## physics

You throw a ball straight up at 25 m/s. How many seconds elapse before it is traveling downward at 13 m/s? 1 s
35. ## physics

3. A 5 N block slides down a 20° incline at constant speed. What is the frictional force?

Rearrange the equation : d=v2t - 1/2at(squared) to solve for a
37. ## physics

If a bug traveled a distance of 180 meters at a speed of 15 m/s, what was the time?
38. ## Physics 221

How much charge flows through a 12 –V battery when a 2.0 mF capacitor is connected across its terminals?
39. ## physics

A soccer ball has a diameter of about 22 cm and a mass of about 430 g. What is its terminal velocity?
40. ## physics

A car accelerates from rest at 2.57 m/s2. What is the velocity at the end of 5.4 s? Answer in units of m/s
41. ## Physics

What’s the specific heat of a material if it takes 6.5 kJ to increase the temperature of a 1.8 kg sample by 6.4 ∘C ?
42. ## Physics

For a pendulum that completes fifteen complete swings in 34.8 seconds, how much is the frequency?
43. ## Physics

What equation gives the velocity as a function of time for an object with constant acceleration?
44. ## physics

if it costs 4.5 to 7.5 cents per kilowatt-hour (wind energy) what is the price per kW?
45. ## physics

if I drop a camera 40m high,how long before it hits the floor? G= 9.81

47. ## physics

masses of 3,5,7,8 kg are suspended at equal distances of 1 m from rod.Find the CG of the arrangement.
48. ## physics

5. What is the acceleration of a 20 N object that is pulled up a 30° incline by a 25 N force? The coefficient of friction is 0.30
49. ## physics

whats the acceleration of a car traveling 402 meters in 6 seconds
50. ## physics

The sensitivity of a galvanometer of resistance 990ohm is increased by 10 times.The shunt used is??
51. ## physics

how long will it take for an apple falling from a 29.4m tall tree to hit the ground? how
52. ## physics

You throw a ball straight up at 25 m/s. How many seconds elapse before it is traveling downward at 13 m/s?
53. ## physics

a year ago she measured 98cm from her tree . now it 1.1m tall how much has it grown
54. ## physics

3. A 5 N block slides down a 20° incline at constant speed. What is the frictional force?
55. ## Physics

If a 75-kg skater starts his skate at 8.0m, at his lowest point (height = 0), what is his velocity?
56. ## physics

What capacitance is required to store an energy of 13 kW·h at a potential difference of 940 V?
57. ## physics

TWO R WHEN CONNECTED IN PARALLEL GIVE RESULTANT VALUE BECOMES 9 OHM CALCULATE VALUE OF REESISTIVITY
58. ## 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.
59. ## physics

Two point charges, each 6*10-5 C, are separated by 30 cm. What is the electrostatic force produced by this arrangement?
60. ## Physics

A ball thrown downward with an initial velocity of 20m/s.what will be itsvelocity after 5s
61. ## Physics(light)

why the ray reflected by the prism is brighter than that by the plane mirror?
62. ## 9th grade conceptual physics

How do you find the cargo capacity for a boat?
63. ## physics.

an object travels 219 meters with acceleration 6.43 m/s^2 over an interval of 2.86 seconds. What are Vi and Vf.
64. ## physics

A 2.7 kg object falls from a tower. It experiences 2.3 N of air resistance. What is the acceleration?
65. ## physics

An object has a length of 5.0 cm, a height of 3.0 cm and a width of 15.0 cm. It has a mass of 24 grams. What is its density?
66. ## physics

explain the input energy and out put energies of two kitchen machines
67. ## Physics

In the photoelectric effect, what determines the kinetic energy of the ejected electrons?
68. ## physics

What equation gives the position as a function of time for an object with constant acceleration?
69. ## physics

what is the gravitational force on a 60k person on the earth, due to the moon?
70. ## physics

find the impulse on a baqseball that is hit 80N of force in a time of 0.52 s
71. ## Physics

How much work must be done to accelerate an 8x105 kg train: a) from 10 m/s to 15 m/s; b) from 15 m/s to 20 m/s; c) to a stop an initial speed of 20 m/s?
72. ## Physics!

A 40 kg girl runs up a flight of stairs that is 34 m high. How much work does this require?
73. ## physics

Calculate the angular velocity of a swinging pendulum whose length is 125cm
74. ## physics

can anyone give me a site that "best explains" about Rotational motion/Angular. thanks a lot.. :)
75. ## physics

An object is thrown vertically upward with a speed of 19.1 m/s. How high does it rise?
76. ## Physics

what is the schwarzschild radius of a black hole with a mass of 1.68x10^43kg
77. ## physics

spring has k=82 N/m use a graph to determine the work needed to stretch it from x= 3.8 cm to x=6.2 cm where x is the displacement
78. ## physics

A lizard accelerates from 2m/s to 10m/s in 4 seconds. What is the lizards average acceleration?
79. ## physics

What is the wavelength of the higher frequency limit (18 megahertz) in dry air at 0 C?
80. ## Physics

When hitting a golf ball, does the force of gravity increase or decrease??
81. ## physics

Explain why voltage doesn't change when connecting resistance in series
82. ## Physics

If a car accelerates from rest to 15 m/s for a distance of 200 m. What is the magnitude of acceleration?
83. ## Physics

What weight of water is required to fill a 80 gallon aquarium? The answer must be in kN
84. ## Physics

P= 231fraction numerator f t asterisk times l b over denominator s end fraction t= 14.3s W= ?
85. ## physics

where would the image of a 4.0 cm tall object that is 12 cm in front of a flat mirror be located?
86. ## Physics

Two forces of 4 N and 6 N act at a point along the same horizontal line. What is its resultant force?
87. ## physics

how to show with the help of a model that resistivity of a conductor increases with increase in temperature?
88. ## physics

What is the concentration (in g/100ml ) of a solution which has 2,8g of NaCI dissolved into 88.0ml of water?
89. ## Physics

How many calories of heat are gained to turn 10 grams of ice at 0 C into water at 0 C?
90. ## physics

A car is moving down a highway at -15 m/s and accelerating at 3 m/s^2. If it's initial position is at x = 0 m where will it be after 3 seconds?
91. ## physics

explain the input energy and out put energies of two kitchen machines
92. ## physics

if r1=2ohms, r2=4ohms, r3=6ohms. Then what is the voltmer reading connected in series
93. ## Physics

If the specific volume of red brass is 0.001865 ft/3lb. What would be the density? Thanks!
94. ## Physics

Show that work done in a wire, E=YAsqr(e)/2l, explainthe symbols. pls help.thanks

find the speed of sound (in m/s) at -35°C at 1 atm pressure in dry air
96. ## physics

Find the density of the earth if its mass is 6×10^3kg and radius is 6.4×10^3km
97. ## Physics

If you combine 34 kg of ice at 0°C with 80 kg of steam at 100°C, what is the final temperature of the system? °C
98. ## PHYSICS

A hypothetical planet has a mass 1.49 times that of Earth, but the same radius. What is g near its surface?
99. ## Physics! NEED HELP!

A 40 kg girl runs up a flight of stairs that is 34 m high. How much work does this require?
100. ## physics

What is meant by the statement that the specific latent heat of steam is 2260000jkg