# Physics!

74,730 results, page 83
1. ## Physics

Simple Harmonic Motion With the equation x=Acos(2 pi f) t why and how does f affect x This is really urgent! Thanx for any help! frequency determines how rapidly x oscillates.
2. ## physics

A motorboat traveling on a straight course slows down uniformly from 75km/h to 40km/h in a distance of 50m. What is the boat’s acceleration?
3. ## physics

what is the coefficient of kinetic friction between a 2kg brick and concrete if it takes 9.0N of force to move it at a constant rate?
4. ## physics

If we wanted a block of iron of mass 3.25 kg to acquire a positive charge of 0.100 C, what fraction of the electrons would we have to remove?
5. ## physics

Find the wavelength (in nm) of a photon whose energy is 5.90 x 10-19 J. I understand that I have to use this equation to figure out the problem E=nhf, I just keep getting the wrong answer. Which is 33.68 nm
6. ## Physics

What is the max speed a car can go on a race track with a radius of 80 meters, the coefficient of friction between the tires and the road is .30
7. ## Physics

A block of mass 0.585 kg is placed on the end of a spring which has a stiffness of 294 N/m. It is pulled down 2.80 cm and released. What is the frequency of oscillation?
8. ## physics

If you push a box a distance of 2,000 meters with a force of 1 newton, how many Calories have you used? 1 Calorie= 4,187 Joules
9. ## Physics

A baseball has a mass of 0.15 kg. A pitcher throws a 40 m/sec fastball which is caught by the catcher. What is the change in momentum of the ball?
10. ## physics

a long jump athlete take off at 25 degree with the horizontal and achieves a jumping distance of 9.12 m. Calculate initial take off speed.
11. ## physics

Two identical loudspeakers are 2 m apart. A person stands 4.6 m from one speaker and 3.4 m from the other. What is the lowest frequency at which destructive interference will occur at this point?
12. ## 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?
13. ## physics

If a cyclist traveling at 14.0m/s skids to a stop in 5.60 s, determine the skidding distance assume uniform acceleration? Answer is 39.2m
14. ## physics

A motorboat traveling on a straight course slows down uniformly from 75km/h to 40km/h in a distance of 50m. What is the boat’s acceleration?
15. ## physics

what is the force required to start moving a 25kg box across a concrete floor with a coefficient of static friction of .65?
16. ## Physics

Which of the following is an example of a baryon? a. meson b. electron c. lepton d. proton and neutron I saw a sight online that said A but on the notes my teacher had us copy it says D. It is d.
17. ## physics

A sharp image is located 83.0 mm behind a 62.0 mm focal-length converging lens. Find the object distance by calculation.
18. ## physics

A chunk of Martian rock falls off of a cliff and drops 47.7 m in 5.00 s. What is the acceleration due to gravity on the surface of Mars?
19. ## physics

A hypothetical planet has a radius 2.1 times that of Earth, but has the same mass. What is the acceleration due to gravity near its surface? What equation should i use?
20. ## physics

A pendulum has a mass of 3-kg, a length of 2 meters and swings through a (half)arc of 27.3 degrees. What is its Amplitude to the nearest centimeter ?
21. ## 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?
22. ## physics

A car of mass 500kg and velocity=36km/h and suddenlybreak applied 150m calculate the force and work done?
23. ## Physics

What mass would you hang on the right side of the system in the figure to balance it -- that is, to make the clockwise and counterclockwise torques equal? (Let x1 = 33 cm and x2 = 12 cm.)
24. ## physics

A satellites are placed in a circular orbit that is 2.44 × 107 m above the surface of the earth. What is the magnitude of the acceleration due to gravity at this distance?
25. ## Physics

Find the terminal velocity of a raindrop of diameter 3mm when it fall through atmospheric air (Appointment and is 249.7m/s)
26. ## 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
27. ## Physics

consider a cart being pulled up an inclined plane by a student during a Physics lab. The applied force on the cart is 18 N is directed parallel to the incline to cause the cart to be displaced parallel to the incline for a given displacement of 0.7 m. The
28. ## Physics

consider a cart being pulled up an inclined plane by a student during a Physics lab. The applied force on the cart is 18 N is directed parallel to the incline to cause the cart to be displaced parallel to the incline for a given displacement of 0.7 m. The
29. ## Physics repost please check

Posted by Mary on Monday, November 5, 2007 at 8:19pm. A charged particle, passing through a certain region of space, has a velocity whose magnitude and direction remain constant. (a) If it is known that the external magnetic field is zero everywhere in
30. ## physics

Biophysics strikes back The Biophysics students are having their usual Saturday night biophysics party performing physics experiments at a classmate’s home. This Saturday it is in an apartment building and you notice a managemnt student (MS) passed out
31. ## Physics please check repost

The pressure and volume of a gas are changed along a path ABCA in the figure. The vertical divisions on the graph represent 4.0 x 10^5 Pa, and the horizontal divisions represent 4.5 x 10^-3 m3. The diagram is a upright rectangle divided into small squares

A charge of -3.00 µC is fixed at the center of a compass. Two additional charges are fixed on the circle of the compass (radius = 0.135 m). The charges on the circle are -3.20 µC at the position due north and +5.00 µC at the position due east. What is
33. ## physics

A physics student pulls a block of mass m = 23 kg up an incline at a slow constant velocity for a distance of d = 4 m. The incline makes an angle q = 25° with the horizontal. The coefficient of kinetic friction between the block and the inclined plane is
34. ## Physics

A certain number of identical resistors are connected in series and their total resistance is measured. When the resistors are disconnected and re-connected in parallel, their total resistance drops to one-percent of the value measured when they were
35. ## physics

A physics student pulls a block of mass m = 20 kg up an incline at a slow constant velocity for a distance of d = 4.5 m. The incline makes an angle Δ = 30° with the horizontal. The coefficient of kinetic friction between the block and the inclined
36. ## physics

It takes you 9.5 minutes to walk with an average velocity of 1.2 m/s to the north form the bus stop to the museum entrance. What is your displacement?
37. ## Physics

If the heat of 110J is added to a gaseous system, change in internal energy is 40J, then the amount of external work done is?
38. ## Physics

Determine the initial acceleration of a 1 kg solid aluminum chunk (density = 2,700 kg/m3) released from rest by a diver 10 m under the ocean.
39. ## physics

A 68.0 kg crate rests on a level floor at a shipping dock. The coefficients of static and kinetic friction are 0.770 and 0.470, respectively.
40. ## Physics

What is the difference in blood pressure (mm-Hg) between the top of the head and bottom of the feet of a 1.008 m-tall person standing vertically?
41. ## physics

(Conservation of Linear Momentum)How do you find the kinetic energy lost during a collision when you already have both the masses and both the initial and final velocities?
42. ## physics

How fast a Ford Focus car weighing 1200 kg should be moving to have the same momentum as the bullet? Express your answer in miles/hr.
43. ## Physics

A construction worker exerts 209N to move a load of bricks a distance of 10m across the parking lot,how much work does he do?
44. ## physics

A crate of mass m = 230 kg is pushed at constant speed up the frictionless ramp (θ = 29.0°) by a horizontal force F. What is the magnitude of F?
45. ## Physics

What is the net force acting on the ring in the diagram?
46. ## Physics

Roller Coaster Cart Mass = 200kg String Compressed by 5m Initial Velocity 25 m/s Find the Spring Constant
47. ## AP Physics B

An object of mass 3.2 kg is allowed to fall from rest under the force of gravity for 3.5 s. What is the change in its momentum? Ignore air resistance.
48. ## Physics Honors

A punter in a football game kicks a ball from the goal line at 60° from the horizontal at 25 m/s. What is the hang time of the punt?
49. ## Physics

Calculate the energy released when 235 U fissions resulting in two lighter stable nuclei with mass numbers 140 and 93.Please help!
50. ## Physics

A 400 kg rocket sled can be accelerated at a constant rate from rest to 1600 km/h in 2.0 s. What is the magnitude of the required net force?
51. ## physics

a bus starts from rest and achieves a velocity of 20m/s in 10s while moving westwards.calculate its avarage acceleration
52. ## help! Physics

I've been getting this question wrong so many times! What is the relationship between the coefficient of friction and the time that it takes the object to reach the bottom of the ramp?
53. ## Physics

The peak wavelength and observed color of a 50,000 K star is 58nm and too blue to see with the human eye. True or False.
54. ## physics

A 1200kg car has its tyres inlated to a gauge pressure of 180kpa.How large an area for each tyre is in contact with the ground
55. ## PHYSICS

Two 75 kg hockey players skating at 5.50 m per s collide and stick together. if the angle between their initial directions was 120 degress, what is their velocity after the collision?
56. ## Physics

Two pans of a balance are 50cm apart. If the fulcrum is displaced by 1cm what percentage is the true weight marked up? the answer i got was 1.3%, please help if wrong (which it probably is).
57. ## physics

A missile is fired at an initial velocity of 1500m/s. What should be the angle to reach a maximum horizontal target? (Show proof) I need your help.
58. ## Physics

Could someone please help me with this question. Thank you The person makes a spin through the air, increasing the angular velocity from 3.0 to 5.0 rev/s while rotating through 1/2 revolution. How much time does this it take ?
59. ## physics

A basketball is thrown at 45° to the horizontal. The hoop is located 4.5m away horizontally at a height of 1m above the point of release. What is the required initial speed?
60. ## physics

A tumor of 120 g absorbs a total of 1.7 J of energy. Determine the absorbed dose in rads. I have no idea, any help is greatly appreciated!
61. ## Physics check

According to Bohr, an electron in an excited state could give off ..... a continuous cascade of photons for a high-level transition.
62. ## Physics

A 3,000 kg truck is traveling 28 m/s through a rainstorm. At the end of its journey, it has collected 500 kg of water and is now moving 24 m/s. Was momentum conserved?
63. ## Physics

charges of -6nC and 4nC are 3m apart.(a)Determine the force they exert on each other.(b) the net electric field intensity at a point midway between them.
64. ## physics

Two comets, each of mass 6500 kg and traveling 88 m/s in opposite directions, collide head-on and come to rest. How much energy is produced in this collision?
65. ## Physics 141

A car is on a circular track of radius r = 100 m. It's tangential speed is 30 m/s. How many lateral gravities does the driver feel?
66. ## physics

At a construction site a pipe wrench struck the ground with a speed of 24 m/s. (a) From what height was it inadvertently dropped? (b) How long was it falling?
67. ## Physics

Why "weighing" individual atoms is a particular challenge? Using A small beam arranged as a cantilever, can be utilized as part of a sensing device.
68. ## Physics

Two blocks of masses 2.9kg and 3.9 kg are held by string upper and lower and given the acceleration 0.2 in upward direction gind tension
69. ## Physics

A construction worker exerts 209N to move a load of bricks a distance of 10m across the parking lot,how much work does he do?
70. ## Physics

A simple pendulum is oscillating with an angular amplitude 60°.If mass of bob is 50 gram the tension in the string at mean position is(g=10m/s2)
71. ## Physics

You drop a rock from a 300-meter cliff. How long will it take to reach the ground? Assume it has no significant air resistance
72. ## Physics

An elevator is moving upward 1.17 m/s when it experiences an acceleration of 0.33 m/s2 downward, over a distance of 0.75 m. What will its ﬁnal speed be? Answer in units of m/s
73. ## Physics

If you ask a friend to drive a small nail into a piece of wood placed on top of a pile of books on your head. Why doesn't this hurt you?
74. ## explian why please its physics

expliain y the very high specific heat capacity of water leads to formation of land and sea breezes???
75. ## Physics

An airplane lands and starts down the runway at a southwest velocity of 46 m/s. What constant acceleration allows it to come to a stop in 1.1 km? PLEASE HELP ME WITH THIS QUESTION AND PROVIDE AN EXPLANATION IF POSSIBLE!!!! THANK YOU!
76. ## physics

In a gas two waves of length 1m and 1.10m have a frequency difference of 10/3 Hz, the velocity of sound is ? a) 166m/s b) 332m/s c) 83m/s d) 336.7m/s
77. ## physics

Two sinusoidal waves of the same frequency travel in the same direction along a string. If ym1 = 4.2 cm, ym2 = 5.9 cm, ö1 = 0, and ö2 = /5 rad, what is the amplitude (in cm) of the resultant wave?
78. ## Physics

A racing car has a mass of 1540 kg. What is its kinetic energy if it has a speed of 110 km/h? Assume that air resistance is negligible.
79. ## Physics!!!

How much work W must be done on a particle with a mass of m to accelerate it from rest to a speed of 0.899c ? Express your answer as a multiple of mc^2 to three significant figures.
80. ## Physics

A basketball player throws a ball at an angle of 30º above the horizontal. At what point does the magnitude of the acceleration reach a minimum?
81. ## PHYSICS

A grinding wheel 0.3m in diametre has amass of 5kg is rotating at an angular velocity of 2300rev/min.what is the kinetic energy?
82. ## PHYSICS

A grinding wheel 0.3m in diametre has amass of 5kg is rotating at an angular velocity of 2300rev/min.what is the kinetic energy?
83. ## Physics

A 5.0cm tall object is placed 16cm from a convex lens with a focal length of 8.4cm. What are the image height and orientation?
84. ## Physics

Suppose the surface (radius = r) of the space station in the figure is rotating at 38.6 m/s. What must be the value of r for the astronauts to weigh one-half of their earth-weight?
85. ## physics

a hairdryer turns 250J of electrical energy into 50J of heated air. how efficient is this machine and how much is wasted to sound?
86. ## physics

How much work did the movers do (horizontally) pushing a 180- crate 10.6 across a rough floor without acceleration, if the effective coefficient of friction was 0.50?
87. ## physics 101

a converging lens has a focal length of 10.0 cm. find the location of the image for object distances of a) 40.0cm b) the magnification
88. ## physics

a 25,000 kg helicopter carrying a 7200 kg load is accelerating up at 1.2 m / sec squared. What is the force of air resistance on the halicopter?
89. ## Physics

Suppose the surface (radius = r) of the space station in the figure is rotating at 38.6 m/s. What must be the value of r for the astronauts to weigh one-half of their earth-weight?
90. ## physics

Is this a trick question? In order to move a heavy object you must push against it with a larger force than it pushes on you. Is this true or false?
91. ## physics

pipe to know how the inner diameter changes. Rank in order from largest to smallest the gas speeds va, vb, and vc at points a, b, and c. Explain in complete sentences.
92. ## physics

we have learnt that Earth's gravitational field strength is 10 N/kg is the same as its acceleration due to free fall (10 m/s/s. even though their units are different, they are said to be dimentionally the same. prove that N/kg is the same as m/s/s
93. ## Physics

A model rocket was launched Amazon man of its height and horizontal distance from launch pad where they can as shown in the table
94. ## physics

a man 60 kg skating with a speed of 10 m/s collides with 40 kg skater at rest and they cling to eachother. Find the loss in kinetic energy?
95. ## physics

A camera with a lens of focal length 10 cm takes a picture of a 160 cm girl standing 24.0 m away. What is the approximate height of the image?
96. ## physics

Two particles with Q1 = 40 µC and Q2 = 87 µC are initially separated by a distance of 2.6 m and then brought closer together so that the final separation is 1.7 m. What is the change in the electric potential energy?
97. ## physics

find the initial velocity of a car stop in 10 second by applying breaks the reaction due to break is 2.5 metre per second square
98. ## physics

a toaster draws a current of 13.0A and has an electric potential difference of 120.V. For how long must it remain on to use 2.0x10^5J of electrical energy?
99. ## physics

A 2.6-kg particle moving along the x axis has a velocity of +1.7 m/s as it passes through the origin. It is subjected to a single force, Fx, that varies with position, as shown below.
100. ## physics

An automobile tire is rated to last for 60,000 miles. To an order of magnitude, through how many revolutions will it turn? I don't know what circumference i should use for 1 rev