# physics help

Most popular questions
1. ## physics help

You drive down the road at 39 m/s (88 mi/h) in a car whose tires have a radius of 34 cm. What is the period of rotation of the tires?2sf value/units Through what angle does a tire rotate in one second?2sf value/ units

asked by anonymous on April 29, 2017
2. ## Physics Help

A small, 200 g cart is moving at 1.50 m/s on an air track when it collides with a larger, 2.00 kg cart at rest. After the collision, the small cart recoils at 0.890 m/s. Q: What is the speed of the large cart after the collision? How do you set this up?

asked by Cat21 on August 6, 2011
3. ## PHYSICS HELP

A diamond's index of refraction for red light, 656 nm is 2.410 while that for blue light, 434 nm, is 2.450. Suppose white light is incident on the diamond at 30 degrees. Find the angles of refraction for these two colors.

asked by Anonymous on October 4, 2017
4. ## Physics Help

1.9 kg block slides along a frictionless surface at 1.8 m/s. A second block, sliding at a faster 4.5 m/s, collides with the first from behind and sticks to it. The final velocity of the combined blocks is 3.5 m/s. What was the mass of the second block? How

asked by falcon306 on August 10, 2011
5. ## physics HELP

which unit is equivalent to meters per second? a. hz*s b. hz*m c. s/hz d. m/hz

6. ## PHYSICS HELP

A 0.26-kg rock is thrown vertically upward from the top of a cliff that is 31 m high. When it hits the ground at the base of the cliff, the rock has a speed of 29 m/s . a.Assuming that air resistance can be ignored, find the initial speed of the rock . v0=

asked by ANONYMOS on April 9, 2017
7. ## PHYSICS HELP

A mercury atom drops from 8.82 eV to 6.67 eve. 1) What is the energy of the photon emitted by the mercury atom? 2) What is the frequency of the photon? 3)What is the wavelength?

asked by Anonymous on October 4, 2017
8. ## physics help

Driving in your car with a constant speed of v= 22 m/s, you encounter a bump in the road that has a circular cross-section, as indicated in the figure. If the radius of curvature of the bump is 52 m, find the apparent weight of a 66-kg person in your car

asked by anonymous on March 27, 2017
9. ## PHYSICS HELP

A 525-N trunk is placed on an inclined plane that forms an angle of 30.0 degrees with the horizontal. What are the components of the weight parallel to the plane and normal to the plane? Memorize this: weight normal = mg cosTheta weight parallel= mg Sin

asked by Suzanne on October 16, 2006
10. ## PHYSICS HELP

a cube of wood with a density of 0.78g/cm^3 is 10cm on a side. When placed in the water what height will the block float above the surface? what am i doing wrong here: height= Desity of cube* volume of cube and devide by the density of water * area of the

asked by PHYSICS HELP on November 13, 2007
11. ## physics help

A 10 g bullet moving at 370 m/s strikes a ballistic pendulum of mass 2kg. The bullet emerges with a speed of 100 m/s. What height does the pendulum rise to? I don't want the answer, i just need hints!!! thnaks

asked by mary on November 18, 2011
12. ## physics help

Imagine you are in an open field where two loudspeakers are set up and connected to the same amplifier so that they emit sound waves in phase at 688 Hz. Take the speed of sound in air to be 344 m/s. If you are 3.00m from speaker A directly to your right

asked by Anonymous on April 19, 2010
13. ## PHYSICS HELP

A team of dogs is pulling a sled that has a load of 2500 kg at a constant speed of 5.0 m/s. The coefficient of kinetic friction between the sled and the snow is 0.10. What is the horizontal force the dogs are exerting on the loaded sled? The horizontal

asked by Suzanne on October 16, 2006
14. ## Physics Help

Find the components of the vector A⃗ with length a = 1.00 and angle α=10.0∘ with respect to the x axis as shown. I can't display the figure obviously, but I figured 1 x cos(10) and 1 x sin(10) would give the two components I need, but I'm still

asked by Eiban on February 1, 2014
15. ## PHYSICS HELP

The maximum lift force on a bat is proportional to the square of its flying speed v. For the hoary bat (Lasiurus cinereus), the magnitude of the lift force is given by FL (0.021 N·s2/m2)v2 The bat can fly in a horizontal circle by "banking" its wings at

asked by Taylor on November 4, 2010
16. ## physics help

At a playground, a 20-kg child sits on a spinning merry-go-round, as shown from above in (Figure 1) . The merry-go-round completes one revolution every 6.2 s, and the child sits at a radius of r=1.8m. a) What is the force of static friction acting on the

asked by anonymous on March 28, 2017
17. ## Physics Help

Two compressible solids are formed into spheres of the same size. The bulk modulus of sphere two is twice as large as the bulk modulus of sphere one. You now increase the pressure on both spheres by the same amount. As a result of the increased pressure,

asked by Alex on November 7, 2012
18. ## physics help

Some dragonflies splash down onto the surface of a lake to clean themselves. After this dunking, the dragonflies gain altitude, and then spin rapidly at about 1100 rpm to spray the water off their bodies. When the dragonflies do this "spin-dry," they tuck

asked by anonymous on April 29, 2017
19. ## PHYSICS HELP

A disk has a moment of inertia of 3.0x10^-4 and rotates with an angular speed of 3.5 rad/sec. WHat net torque must be applied to bring it to rest in 3.0s? can some one help me out with this im lost!!!

asked by PHYSICS HELP on November 13, 2007
20. ## physics help

in a local diner a customer slides an empty coffee cup down the counter for a refill. the cup slides off the counter and strikes the floor at a distance d from the base of the counter. if the height of the counter is h. a) find an expression for the time t

asked by john on October 3, 2011
21. ## physics help

Assuming a typical efficiency for energy use by the body, how many slices of pizza must you eat to walk for 3.0 hr at a speed of 5.0 km/hr ? (Assume your mass is 68 kg).

asked by ziddi on March 31, 2010
22. ## physics help

In this experiment you will be asked to plot a graph of mhg versus ac and fit your data to a straight line. What is the slope of the graph equal to in terms of the rotating mass MR? (Use any variable or symbol stated above as necessary.)

asked by Sarah on November 2, 2011
23. ## Physics HELP

You have two containers half full with liquid 1. You then fill the two containers respectively with a layer of liquid 2 and 3. A ray of light travelling through the bottom layer (liquid 1) and into the top layer experiences total internal reflection off

asked by Jeff on November 29, 2017
24. ## Physics help

A 300 g bird flying along at 6.4 m/s sees a 10 g insect heading straight toward it with a speed of 34 m/s (as measured by an observer on the ground, not by the bird). The bird opens its mouth wide and enjoys a nice lunch. What is the bird's speed

asked by falcon306 on August 8, 2011
25. ## Physics Help

A graph of wavelength vs. 1/frequency should be a straight line. What are it's slope and y-intercept? I'm not given any graphs or numbers, just this question. And I know that Velocity = frequency x wavelength And that slope is found by rise/run and m=

asked by Eiban on April 3, 2014
26. ## Physics help

1. The fundamental force that: (4 marks) ____ 1. causes hair to stand on end after being rubbed by a balloon a) strong nuclear ____ 2. causes protons to remain in the nucleus despite repulsive forces b) weak nuclear ____ 3. controls the planets' orbit

asked by Matt Damon on February 4, 2016
27. ## PHYSICS HELP

A box rests on a plank that is inclined to the horizontal. As the angle between the plank and the horizontal increases, does the component of the weight of the box parallel to the plank increase, decrease, or remain the same? Explain your answer. see the

asked by Suzanne on October 16, 2006
28. ## Physics HELP

In a downtown office building you notice that each of the four sections of a rotating door has a mass of 90 kg. What is the width of each section of the door if a force of 58 N applied to the outer edge of a section produces an angular acceleration of

asked by Jeff on November 15, 2017
29. ## Physics help

A 75.0 kg novice skier is going down a hill with several secondary hills. Ignore frictional effects and assume the skier does not push off or slow himself down. If the initial hill is 38.7 m above the chalet level: (8 marks) a) What is the speed of the

asked by silverback on January 12, 2016
30. ## Physics Help

0.30 mol of argon gas is admitted to an evacuated 50cm^3 container at 20 C. The gas then undergoes an isobaric heating to a temperature of 340C. What is the set up for this? I can plug in the values

asked by Lizzie on August 15, 2011
31. ## Physics help

A particle moving along the y-axis has the potential eneryg function U = 6 * y3 J where y is in m. What is the y-component of the force on the particle at 0 m? What is the y-component of the force on the particle at 9 m? What is the y-component of the

asked by Me on November 9, 2011
32. ## physics help

A flywheel turns through 32 rev as it slows from an angular speed of 2.1 rad/s to a stop. How much time is required for it to complete the first 16 of the 32 revolutions?

asked by stanely on April 8, 2010
33. ## Physics help

Two masses m1 = 2 kg and m2 = 4 kg are connected by a light string. Mass m2 is connected to mass M = 14 kg by a string that passes over an ideal pulley. Determine the following quantities when the system is released from rest. (a) The acceleration of the

asked by arcos15 on October 26, 2012
34. ## PHYSICS HELP

A 320-N sphere 0.20 m in radius rolls without slipping 6.0 m down a ramp that is inclined at 25° with the horizontal. What is the angular speed of the sphere at the bottom of the slope if it starts from rest?

asked by A on November 3, 2010
35. ## Physics Help

A projectile is fired at an upward angle of 60 degrees with a speed of 100m/s. It lands on a plateau 150m higher. What is the projectile's speed the moment before it strikes the plateau? I'm thinking to just use the kinematic equation Vf^2= Vi^2 + 2aΔy.

asked by George on December 13, 2015
36. ## physics help

A straight horizontal sretch of copper wire carries a current of 28 A .What are the magnitude and direction of the magnetic field needed to float the wire that is to balance its weight? Linear density=46.6g/m

asked by angy on May 31, 2016
37. ## Physics Help

A dumbbell has a mass m on either end of a rod of length 2a. The center of the dumbbell is a distance r from the center of the Earth, and the dumbbell is aligned radially. If r≫a, the difference in the gravitational force exerted on the two masses by the

asked by jacob on December 7, 2015
38. ## physics HELP

A projectile is fired with an initial speed of 1000 m/s at an angle of 37 degrees above the horizontal. If air resistance is neglected, the horizontal component of the projectile's velocity after 20 s is approximately A) 600 m/s B) 800 m/s C) 640 m/s D) 40

asked by anonymous on November 30, 2010
39. ## physics help

A 1210 N uniform beam is attached to a vertical wall at one end and is supported by a cable at the other end. A W = 1820 N crate hangs from the far end of the beam. The angle between the beam and the horizontal is 30 degrees upwards and the angle between

asked by james on November 27, 2010
40. ## Physics help

A light rope is wrapped several times around a large wheel with a radius of 0.435 m. The wheel? A light rope is wrapped several times around a large wheel with a radius of 0.435 m. The wheel rotates in frictionless bearings about a stationary horizontal

asked by BB on February 27, 2012
41. ## physics help

particle 1 of mass m1 = 0.29 kg slides rightward along an x axis on a frictionless floor with a speed of 1.8 m/s. When it reaches x = 0, it undergoes a one-dimensional elastic collision with stationary particle 2 of mass m2 = 0.40 kg. When particle 2 then

asked by beav on March 26, 2010
42. ## physics help

1. A roller coaster car starts from rest and rolls down a frictionless track, reaching speed fv at the bottom. a. If you want the car to go two times as fast at the bottom, by what factor must you increase the height of the track? b. Does your answer to

asked by joyce on November 7, 2008
43. ## Physics Help

While a person is walking, his arms swing through approximately a 45° angle in 1/2 s. As a reasonable approximation, we can assume that the arm moves with constant speed during each swing. A typical arm is 70.0 cm long, measured from the shoulder joint.

asked by D.J on February 14, 2012
44. ## physics help

particle 1 of mass m1 = 0.29 kg slides rightward along an x axis on a frictionless floor with a speed of 1.8 m/s. When it reaches x = 0, it undergoes a one-dimensional elastic collision with stationary particle 2 of mass m2 = 0.40 kg. When particle 2 then

asked by mike on March 26, 2010
45. ## Physics help

find the average acceleration (m/s^2) The formula is a=v2-v1/change in time I don’t understand how to solve this since I only have the average time and distance in (m) for the marble Please explain using steps I’m really stuck

asked by . on March 17, 2019
46. ## physics help

The earth orbits the sun once a year (3.16 10^7 s) in a nearly circular orbit radius 1.50 10^11 m. With respect to the sun, determine the following. (a) the angular speed of the earth 1 rad/s (b) the tangential speed of the earth 2 m/s (c) the magnitude

asked by john on November 19, 2010
47. ## Physics HELP

You have a converging (convex) lens and a diverging (concave) lens and the magnitude of the focal length of each lens is 38.5 cm. (a) Determine which lens you should use in order to produce an image of a light bulb on a screen several metres away. (b)

asked by Drew on December 4, 2017
48. ## Physics help

A skier approaches the base of an icy hill with a speed of 11.6 m/s. The hill slopes upward at 24° above the horizontal. Ignoring all friction forces, find the acceleration of this skier (a) when she is going up the hill, (b) when she has reached her

asked by Ann on February 4, 2012
49. ## physics help

A 1210 N uniform beam is attached to a vertical wall at one end and is supported by a cable at the other end. A W = 1820 N crate hangs from the far end of the beam. The angle between the beam and the horizontal is 30 degrees upwards and the angle between

asked by james on November 27, 2010
50. ## physics help

The femur is a bone in the leg whose minimum cross-sectional area is about 3.60 10-4 m2. A compressional force in excess of 6.90 104 N will fracture this bone. (a) Find the maximum stress that this bone can withstand. (b) What is the strain that exists

asked by yoni on November 16, 2010
51. ## Physics help

A ladder of length 2L and mass M is positioned on level ground leaning against a wall such that the angle between the ladder and the horizontal is α. The coefficient of static friction between the ladder and the wall and between the ladder and the ground

asked by Anon on December 6, 2017
52. ## Physics help

A 31.0 kg child on a swing reaches a maximum height of 1.92 m above their rest position. Assuming no loss of energy: a) At what point during the swing will she attain their maximum speed? b) What will be her maximum speed through the subsequent swing? c)

asked by Help me in Physics on January 11, 2016
53. ## physics help

Three co-linear forces f1=45 N west,f2=63 N east and an unknown force f3 are applied to an object.The resultant force of the three forces is 12 N west determine the magnitude and direction of the force f3 using an algebric calculation(vector addition)

asked by melissa on October 8, 2015
54. ## Physics help

In Millikan's experiment, an oil drop of radius 1.516 µm and density 0.860 g/cm3 is suspended in chamber C (Figure 22-14) when a downward-pointing electric field of 1.92 105 N/C is applied. Find the charge on the drop, in terms of e. (Include the sign.)

asked by Frank on February 15, 2007
55. ## Physics help

A car with a mass of 1800 kg is initially travelling with a velocity of 22 m/s [N] when it collides with a truck with a mass of 3200 kg traveling with a velocity of 14 m/s [E]. If the two vehicles become attached during the collision, determine their final

asked by JACKIE CHAN on January 28, 2016
56. ## physics help

Example 11-9 depicts the following scenario. A cat walks along a plank with mass M= 7.00 kg. The plank is supported by two sawhorses. The center of mass of the plank is a distance d1= 0.850 m to the left of sawhorse B. When the cat is a distance d2= 1.11 m

asked by sinti on May 9, 2017
57. ## PHYSICS HELP

m1 = 2.7 kg block slides on a frictionless horizontal surface and is connected on one side to a spring (k = 40 N/m) as shown in the figure above. The other side is connected to the block m2 = 3.6 kg that hangs vertically. The system starts from rest with

asked by joe on November 6, 2011
58. ## PHYSICS HELP

A couple of astronauts agree to rendezvous in space after hours. Their plan is to let gravity bring them together. She has a mass of 66.0 kg and he a mass of 72.0 kg, and they start from rest 25.0 m apart. A)Find his initial acceleration. i put 7.68*

asked by Gina on February 16, 2012
59. ## physics help

Michelle is enjoying a picnic across the valley from a cliff. She is playing music on her radio (assume it to be an isotropic source) and notices an echo from the cliff. She claps her hands and the echo takes 2.6 s to return. (a) Given that the speed of

asked by anna on March 31, 2010
60. ## physics help

An amusement park ride consists of a car moving in a vertical circle on the end of a rigid boom of negligible mass. The combined weight of the car and riders is 5.1 kN, and the circle’s radius is 10 m. At the top of the circle, what are the (a) magnitude

asked by Anonymous on March 3, 2010
61. ## Physics help

how would you investigate if the half life of water dripping from a burette is constant? I know the method but what equation and principle would ya'll use?

asked by Daggeron on February 17, 2008
62. ## PHYsics HELP

When you hold an insect at the near point of your eye it subtends an angle of 5.00 10-3 rad. Determine the angular size (magnitude only) of the insect when viewed through a microscope that has an angular magnification with a magnitude of 117.

asked by Jeff on December 1, 2017
63. ## Physics HELP

A 2.0-m measuring stick of mass 0.215 kg is resting on a table. A mass of 0.500 kg is attached to the stick at a distance of 72.0 cm from the centre. Both the stick and the table surface are frictionless. The stick rotates with an angular speed of 6.50

asked by Jeff on November 15, 2017
64. ## PHYSICS HELP

(a) If your relaxed eye has a refractive power of 56.0 D, and your lens-to-retina distance is 2.35 cm, determine if you are nearsighted or farsighted. (b) If you are nearsighted, determine your far point. If you are farsighted, determine your near point.

asked by Dan on December 4, 2017
65. ## physics help

Two children are playing a game in which they try to hit a small box on the floor with a marble fired from a spring-loaded gun that is mounted on a table. The target box is horizontal distance D = 1.60 m from the edge of the table, see the figure. Bobby

asked by stan on March 18, 2010
66. ## Physics HELP

When potential difference across the terminals of a battery is measured using an analogue voltmeter of resistance 95 ohms, the reading on the voltmeter is 5.70 V. When it is measured using a very high resistance digital meter the reading is 6.00 V. What is

asked by Ari on March 3, 2019
67. ## physics help

A woman is pushing a sofa at constant speed of 1.0 m/s on a horizontal surface. She exerts a horizontal force of 80 N in the direction of motion. A) how can the sofa move at constant speed without Newton's first law being violated? B)Approximately how hard

asked by Stan on September 28, 2010
68. ## physics HELP

A sailboat starts from rest and accelerates at a rate of 0.18 m/s2 over a distance of 494 m. (a) Find the magnitude of the boat's final velocity. (b) Find the time it takes the boat to travel this distance.

asked by Brianna on September 19, 2017
69. ## physics help

At t=1.0s, a 0.49 kg object is falling with a speed of 6.5 m/s. At t=2.0s, it has a kinetic energy of 38 J. What is the kinetic energy of the object at t=1.0s? What is the speed of the object at t=2.0s? How much work was done on the object between t=1.0s

asked by ani on April 3, 2017
70. ## Physics Help

A toy car in the figure below runs off the edge of a table that is h = 1.175 m high. The car lands d = 0.400 m from the base of the table .How long did it take the car to fall? How fast was the car going on the table?

asked by Sarah on October 22, 2014
71. ## Physics Help

You're driving at 39km/h , when the traffic light 25m away turns yellow. I need to find the constant acceleration required to stop at the light, the stopping time, and weather the acceleration is reasonable. I know how to find the average and instantaneous

asked by Eiban on January 28, 2014
72. ## physics help

A pendulum of mass m= 0.8 kg and length l=1 m is hanging from the ceiling. The massless string of the pendulum is attached at point P. The bob of the pendulum is a uniform shell (very thin hollow sphere) of radius r=0.4 m, and the length l of the pendulum

asked by Anonymous on January 10, 2014
73. ## pHYSICS HElp

***EXTRA CREDIT*** Figure 8-33 shows a 1.50 kg block at rest on a ramp of height h. When the block is released, it slides without friction to the bottom of the ramp, and then continues across a surface that is frictionless except for a rough patch of width

asked by Kelly on March 31, 2010
74. ## physics help

Larry weighs 300 N at the surface of the earth. what is the weight of the earth in the gravitational field of Larry? -would it still be 300 N

asked by julie on October 17, 2007
75. ## physics help

A bowling ball (mass=72kg,Radius=0.11m) and A billiard ball (mass=0.47kg, Radius=0.028m)May each be treated as uniform sheres. What is the magnitude of the maximum gravitational force that each can exert on the other . The maximum gravitational force

asked by anonymous on February 16, 2007
76. ## Physics Help

Freshly picked cucumbers are dropped into a bin from a height of 1.25 m above the bottom of the bin. Assuming that the bin is empty, how fast is a cucumber going when it hits the bottom of the bin? How much time does it take the cucumber to fall to the

asked by Kayla on September 11, 2014
77. ## Physics help

A beetle whose mass is 2 g sits on a turntable at a distance of 12 cm from the center. The turntable is rotating at 33 rpm. (a) What are its acceleration and the centripetal force on it? a =______ m/s2 Fc=_____ N (b) What is the interaction that provides

asked by arcos15 on November 3, 2012
78. ## physics help

A 1100 kg automobile is at rest at a traffic signal. At the instant the light turns green, the automobile starts to move with a constant acceleration of 3.0 m/s2. At the same instant a 2800 kg truck, traveling at a constant speed of 8.0 m/s, overtakes and

asked by beav on March 26, 2010
79. ## Physics HELP

1.If a particle moves in a plane so that its position is described by the functions x=A*cos(wT) and y=A*sin(wT), the particle is ( w-angular velocity, T-period) A) moving with constant speed along a circle B) moving with a varying speed along a circle

asked by Kelly on May 13, 2007
80. ## Physics help

You are standing directly under an electrical wire carrying current towards the South. If the wire is carrying 180 A and is located 12 m overhead, determine the magnitude and direction of the magnetic field where you are standing. direction of the magnetic

asked by Matt Damon on March 17, 2016
81. ## Physics help

A soccer player kicks a soccer ball at +10.0 m/s at an angle of 60°. What are the horizontal and vertical components of velocity of the kick? So I got; vx = +8.66 m/s and vy = +5.00 m/s but I feel like I might have gotten the + and - wrongs..Did I mess up

asked by Marie on December 11, 2014
82. ## PHYSICS HELP

m1 = 2.7 kg block slides on a frictionless horizontal surface and is connected on one side to a spring (k = 40 N/m) as shown in the figure above. The other side is connected to the block m2 = 3.6 kg that hangs vertically. The system starts from rest with

asked by joe on November 6, 2011
83. ## physics help

a fireman D=50 m away from a burning building directs a stream of water from a ground-level fire hose at an angle of 30 degrees above the horizontal. If the speed of the stream as it leaves the hose is 40.0 m/s at what height will the stream of water

asked by student on October 2, 2011
84. ## physics help

An electric circular saw is designed to reach its final angular speed, starting from rest, in 1.16 s. Its average angular acceleration is 375 rad/s2. Obtain its final angular speed.

asked by harry on November 19, 2010
85. ## Physics help

You are watching a marching band practice outdoors. Near you are two trumpet players, one marching directly towards you and one away from you at the same speed. Each trumpet player is playing an A (440 Hz) and you hear a beat between the two sounds at a

86. ## Physics help

a pendulum bob with a mass of 0.13 kg is attached to a string with a length of 0.95 m. we choose the potential energy to be zero when the string makes an angle of 90 degrees with the vertical. (a) find the potential energy of this system when the string

asked by Erica L on January 26, 2011
87. ## Physics HELP

an object 3.00 cm high is placed 20.0cm from a convex mirror with a focal length of magnitude 8.00 cm. Find the position of the image. (Im using 1over20.00 + 1overQ = 1over-8.00) and the answer is q= -5.71cm. can someone tell how to do the math.. I suck at

asked by walter on June 16, 2012
88. ## Physics Help

Does atomic excitation occur in solids as well as in gases? Yes or No and Why?

asked by Josh on May 2, 2012
89. ## physics help

help me with this question 2. A hydrogen electron drops from the n=4 level to the n=1 level. A. What is the energy of an emitted photon? B. Calculate the frequency of the photon. C. Calculate the wavelength of the photon.

asked by carey on January 23, 2012
90. ## PHYSICS HELP

Suppose the aliens watching the show are on the surface of Mars. Mass of Mars: 6.42 x 10^23 kg Radius of Mars: 3.394 x 10^6 m Calculate; A) the weight of a 40.0 kg alien on Mars B) the weight of 40.0kg alien on earh Earth-sun distance:1.50x10^11m Mars-sun

91. ## Physics help

A 0.50-kg block rests on a horizontal, frictionless surface, it is pressed against a light spring having a spring constant of k = 800 N/m, with an initial compression of 2.0 cm. To what height h does the block rise when moving up the incline? what would be

asked by user on June 17, 2012
92. ## physics help

At a certain location, the solar power per unit area reaching the Earth's surface is 180 W/m2 averaged over a 24-hour day. Suppose you live in a solar powered house whose average power requirement is 3.2 kW. At what rate must solar energy reach your solar

asked by sarah on March 27, 2011
93. ## physics help

a particle moves uniformly around the circumference of a circle whose radius is 8 cm with a period of pi/20 s. the angular velocity w of the particle is a. 2.5 rad/s b. 3.2 X 10^2 rad/s c. 40 rad/s d. 7.9 rad/s e. 96 rad/s please explain thanks!

asked by rory on December 14, 2008
94. ## physics help

A pendulum of mass m= 0.8 kg and length l=1 m is hanging from the ceiling. The massless string of the pendulum is attached at point P. The bob of the pendulum is a uniform shell (very thin hollow sphere) of radius r=0.4 m, and the length l of the pendulum

asked by Anonymous on January 10, 2014
95. ## physics help

How much energy must be removed from a 200g block of ice to cool it from 0C to -30C? What is the equation for this?

asked by olson56 on August 14, 2011
96. ## physics help

A ski gondola is connected to the top of a hill by a steel cable of length 680 m and diameter 1.7 cm. As the gondola comes to the end of its run, it bumps into the terminal and sends a wave pulse along the cable. It is observed that it took 15 s for the

asked by Anonymous on April 27, 2010
97. ## physics help

a 3.5 kg dog stands on a 21 kg flatboat at distance D = 6.1 m from the shore. It walks 2.3 m along the boat toward shore and then stops. Assuming no friction between the boat and the water, find how far the dog is then from the shore. I thought i have the

asked by mike on March 26, 2010
98. ## Physics HELP

When the pressure P of a fixed mass of gas is inversely proportional to its volume V at constant temperature. (Where mass and temperature are constant) When volume is increased, the distance between the walls of the container is ?. This causes the average

asked by Timu on June 5, 2016
99. ## Physics help

I'm preparing for a test. Can anyone check my answer for all these questions? These are my questions: 1. A stationary curling stone is struck in a glancing collision by a second curling stone of equal mass. If the first stone moves away at a velocity of

asked by I NEED DAMON'S HELP on January 28, 2016
100. ## physics help

Please explain the answers. Thank You 1. A rifle is fired horizontally over a large flat plane. At the instant the rifle is fired, a student drops a second identical bullet from the same height as the rifle. Which bullet hits the ground first? 2. A monkey

asked by Mia on March 19, 2015

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