Saturday

April 19, 2014

April 19, 2014

**Recent Homework Questions About Physics**

Post a New Question | Current Questions

**physics**

- (3000)(891) Joules
*Wednesday, March 12, 2014 at 6:18pm*

**Physics**

CHECK MY ARITHMETIC !!! It came out awful coincidental though.
*Wednesday, March 12, 2014 at 6:17pm*

**Physics**

initial momentum = m V1 + 3m V2 final momentum = 4 m V3 same final momentum as initial so V3 = (V1+3 V2)/4 initial Ke = .5 m( V1^2 + 3 V2^2) final Ke = .5 (4m) (V3^2) = 2 m(V3^2) = 4 (.5m)V3^2 so change = .5m (V1^2+3V2^2 - 4 V3^2) but V3^2 = (V1^2 + 6V1V2 + 9V2^2)/16 4 V3^2...
*Wednesday, March 12, 2014 at 6:16pm*

**physics**

a car thats 1000 kg is stopped and the brakes exert a force of 3000 N over a distance of 891 meter, how much work is done?
*Wednesday, March 12, 2014 at 6:09pm*

**physics**

This question is just straight forward. We know that it all about EK and EP but it common sense to answer this question. It says 8kg falls from rest and the height is 100 m Neglect air resistance and calculate the total energy after falling a distance of 40 m. Fall from rest _...
*Wednesday, March 12, 2014 at 6:08pm*

**Physics**

The rope forms a triangle with the pole and the angle is between the rope and the point at which it connects to the pole.
*Wednesday, March 12, 2014 at 6:02pm*

**Physics**

A car of mass m moving at a speed v1 collides and couples with the back of a truck of mass 3m moving initially in the same direction as the car at a lower speed v2. (Use any variable or symbol stated above as necessary.) (b) What is the change in kinetic energy of the car&#...
*Wednesday, March 12, 2014 at 6:02pm*

**Physics algebra error**

T = m(9.81)/cos A T sin A = m Ac = m v^2/R where R = 18 sin A so m (9.81) sin A/cosA = m v^2 /(18 sin A) v^2 = 9.81 * 18 * sin^2 A/cos A check my arithmetic !!!
*Wednesday, March 12, 2014 at 5:51pm*

**Physics**

I do not know where your angle is If from straight down then: T = tension m g = weight A = angle from vertical vertical equation T cos A = m g = m(9.81) so T = m(9.81)/cos A T sin A = m Ac = m v^2/R where R = 18 sin A so m (9.81) sin A = m v^2 /(18 sin A) v^2 = 9.81 * 18 * sin...
*Wednesday, March 12, 2014 at 5:48pm*

**Physics**

A carnival seat and a passenger has a combined weight of 193. As the seat is spun on a 18m rope tethered to a pole at an angle of 59.2 degrees, at what speed is the seat traveling?
*Wednesday, March 12, 2014 at 5:27pm*

**Physics**

71 kg = volume displaced * 1000 kg/m^3 so V = 71/1000 m^3 area * delta h = volume = 71/1000 2.34 * delta h = 71/1000 delta h = 30.34 /1000 in meters = 30.34/10 in cm = 3.03 cm
*Wednesday, March 12, 2014 at 5:26pm*

**Physics**

A 71 kg girl dives off a raft 2.34 square meters floating in a freshwater lake. By how much does the raft rise in cm? Write your answer correct to two decimal places.
*Wednesday, March 12, 2014 at 5:16pm*

**physics**

Its been 5 long years Sue dont make me beat yo ass
*Wednesday, March 12, 2014 at 5:10pm*

**physics**

momentum = 3 (2) + 18 (0) = 6 before and after so 6 = 3 (u) + 18(v) or 2 = u + 6 v so u = (2 - 6 v) = 2 (1-3v) Ke same before and after: so 3(2^2) = 3u^2 + 18v^2 12 = 3(4)(1-3v)^2 + 18 v^2 2 = 2 (1 - 6v +9 v^2 ) + 3 v^2 0 = -12 v +18 v^2 + 3 v^2 21 v^2 = 12 v 21 v = 12 v = 12/...
*Wednesday, March 12, 2014 at 4:49pm*

**physics**

A glider with a mass of 3 kg is moving rightward at a speed of 2 m/s on a frictionless horizontal air track. It collides with a stationary glider whose mass is 18 kg. If the collision is elastic, what is the speed of the gliders after the collision? Use SI units in your answer...
*Wednesday, March 12, 2014 at 4:36pm*

**Physics**

1) true if stopped 2) yes max Ke at min height 3) Huh? It is true the normal force does not do work, but the friction force does so mechanical energy is LOST to heat. That is why it ends up lower and has to be towed back up to the start. 4) Well, this is true only if you ...
*Wednesday, March 12, 2014 at 4:02pm*

**Physics**

Looking up the answers will not help you on the physics test. Try looking in your book or reading guides for additional help.
*Wednesday, March 12, 2014 at 2:42pm*

**Physics**

- 3000 (719) Joules
*Wednesday, March 12, 2014 at 2:27pm*

**Physics needs help**

Indicate your specific subject in the "School Subject" box, so those with expertise in the area will respond to the question.
*Wednesday, March 12, 2014 at 1:18pm*

**Physics**

force = change in momentum/time = m a if m constant Force * time = change in momentum F * 5 = 1400 * 25 F = 1400 * 5 = 7000 Newtons
*Wednesday, March 12, 2014 at 12:31pm*

**Physics**

How large an average force is required to stop a 1400-kg car in 5.0 s if the car’s initial speed is 25 m/s?
*Wednesday, March 12, 2014 at 12:13pm*

**Physics**

Consider a simple frictionless roller-coaster. It begins at x = 0, at a height of y = H. Then it drops into a dip, reaching a minimum at x = 100, with zero height (y = 0). Finally, it goes back up at x = 200, but only reaches a height of y = H/2. Assume the roller-coaster car ...
*Wednesday, March 12, 2014 at 12:07pm*

**Physics**

a) A bullet (m = 0.0250 kg) is fired with a speed of 91.00 m/s and hits a block (M = 2.80 kg) supported by two light strings as shown, stopping quickly. Find the height to which the block rises. b)Find the angle (in degrees) through which the block rises, if the strings are 0....
*Wednesday, March 12, 2014 at 12:05pm*

**Physics**

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 3.46 m horizontally from the edge of the table. Bobby compresses the spring 0.97 cm, but the center of ...
*Wednesday, March 12, 2014 at 12:04pm*

**Physics**

Use the following information to calculate the speed of a ball in a pinball machine at a specific location. The ball is launched by using a spring (k = 703 N/m) compressed by 9.0 cm. Consider the starting position of the ball to be its location when the spring is compressed. ...
*Wednesday, March 12, 2014 at 12:03pm*

**Physics**

True or false Consider a simple frictionless roller-coaster. It begins at x = 0, at a height of y = H. Then it drops into a dip, reaching a minimum at x = 100, with zero height (y = 0). Finally, it goes back up at x = 200, but only reaches a height of y = H/2. Assume the ...
*Wednesday, March 12, 2014 at 12:03pm*

**Physics**

Alfonso and Sarah like to go sky diving together. Alfonso has a mass of 86.0 kg and Sarah has a mass of 57.8 kg. While in free fall together (next to each other), Alfonso pushes Sarah horizontally with a force of 12.9 N. What is the magnitude of Alfonso's horizontal ...
*Wednesday, March 12, 2014 at 11:56am*

**Physics**

Stan the strongman lifts a 524 kg dumbbell from the floor to 1.69 meters above the floor at a constant velocity. How much energy does it take Stan to lift the dumbbell?
*Wednesday, March 12, 2014 at 11:49am*

**Physics**

If I stop my 1000 kg car by applying a force with my brakes equal to 3000 N in a distance of 719 meters, how much work is done. (Pay attention to the direction of the force and the displacement)(? J)
*Wednesday, March 12, 2014 at 11:30am*

**Physics**

How fast can a car be going around a turn with radius 42.3 m if the road is covered with ice? (The μs for rubber on ice is 0.10)? Give your answer in miles per hour.
*Wednesday, March 12, 2014 at 11:29am*

**Physics**

Ac = v^2/r = omega^2 r v = omega * r omega = 33.3 * 2 pi / 60 = 3.49 radians/second Ac = 3.49^2 (.15) = 1.82 m/s^2 2. F = m a = .0073 * 1.82 = .0133 Newtons
*Wednesday, March 12, 2014 at 10:57am*

**Physics**

falls 3 meters (1/2) m v^2 = m g (3) v^2 = 2 mg(3) v = sqrt (2 m g(3) You should remember forever This: when something falls distance h from zero speed at top and no air drag v = sqrt (2 g h) mass does not matter for this
*Wednesday, March 12, 2014 at 10:52am*

**Physics**

Pe at top = m g h = 3.3 * 9.81 * 1.03 a) Pe at 1.03-.27 = 3.3 * 9.81 * 0.76 find difference that difference is Ke in Joules so difference = (1/2) m v^2
*Wednesday, March 12, 2014 at 10:49am*

**Physics**

A 3.3 kg pendulum bob hangs from a 2 meter string. It is pulled to the side, position A, so that the bob is 103 cm (h on the sketch) above the lowest position, position C. The bob is released and begins to swing. a) What is its potential energy after it has swung to position B...
*Wednesday, March 12, 2014 at 9:24am*

**Physics**

A bead of mass m = 33.5 kg is released from point A which is located 5 m above the ground and slides on a frictionless track. Determine the bead's speed when it reaches point C which is located 2.0 m above the ground.
*Wednesday, March 12, 2014 at 9:20am*

**Physics**

1. A standard LP record has a diameter of 30 centimeters. A record on a standard turntable rotates 33.3 times a minute. What is the centripetal acceleration of a point on the edge of the record? 2.If a 7.3 gram coin is placed at the very edge of the record described in the ...
*Wednesday, March 12, 2014 at 9:09am*

**Physics please help**

KE=0.5MV
*Wednesday, March 12, 2014 at 8:33am*

**physics**

0.2227
*Wednesday, March 12, 2014 at 6:23am*

**7th Grade**

In my school, we have three units for seventh grade: Chemistry, Physics, & Astronomy. If you want to know your personal science class curriculum, ask your teacher! Hope I helped! ~Sanja
*Wednesday, March 12, 2014 at 1:30am*

**physics**

A spring cannon is fastened to a glider at rest on a horizontal frictionless air track. The combined mass of the cannon and the glider is 0.560kg. The cannon fires a ball with a mass of 50g horizontally at a speed of 14 m/s. How fast does the cannon-glider assembly move ...
*Wednesday, March 12, 2014 at 12:55am*

**URGENT physics**

The escape velocity of a bullet from the surface of planet Y is 1695 m/s. Calculate the escape velocity from the surface of the planet X if the mass of planet X is 1.37 times that of Y, and its radius is 0.887 times the radius of Y (in m/s).
*Tuesday, March 11, 2014 at 11:37pm*

**URGENT physics**

M1 is a spherical mass (38.6 kg) at the origin. M2 is also a spherical mass (10.3 kg) and is located on the x-axis at x = 59.8 m. At what value of x would a third mass with a 20.0 kg mass experience no net gravitational force due to M1 and M2?
*Tuesday, March 11, 2014 at 11:36pm*

**Physics**

The figure(Figure 1) shows a solid metal sphere at the center of a hollow metal sphere. Assume that E=1.2×104N/C. What is the total charge on the exterior of the inner sphere?
*Tuesday, March 11, 2014 at 10:20pm*

**Physics 141**

A mine car (mass mcar = 444 kg) rolls at a speed of vcar = 0.52 m/s on a horizontal track, as the drawing shows. An mcoal = 141 kg chunk of coal has a speed of vcoal = 0.79 m/s when it leaves the chute. Determine the speed of the car-coal system after the coal has come to rest...
*Tuesday, March 11, 2014 at 10:14pm*

**Physics 141**

speed of rock = 15.5 , mass = .32 speed of wagon = v , mass = 92.7 initial momentum = 93 * .52 = 48.4 final momentum = initial momentum so 48.4 = .32*15.5 + 92.7*v solve for v if backward 48.4 = -.32*15.5 + 92.7*v
*Tuesday, March 11, 2014 at 10:07pm*

**Physics 141**

A wagon is rolling forward on level ground. Friction is negligible. The person sitting in the wagon is holding a rock. The total mass of the wagon, rider, and rock is 93.0 kg. The mass of the rock is 0.320 kg. Initially the wagon is rolling forward at a speed of 0.520 m/s. ...
*Tuesday, March 11, 2014 at 9:51pm*

**physics**

Radius should be 0.90Sin(70) that would account for the length of the path that the stone is traveling in. Use the equation above and substitute .90Sin(70) for the radius.
*Tuesday, March 11, 2014 at 9:48pm*

**Physics 141**

south momentum = 75 * 7.35 = 551 east momentum = 45 * 2.85 = 128 new mass = 45 + 75 = 120 new momentum = old momentum (Newton #1 law) south speed = 551/120 = 4.59 east speed = 128/120 = 1.07 theta = tan^-1 (4.59/1.07) = 76.9 degrees Vf = sqrt(4.59^2+1.07^2) = 4.71 m/s
*Tuesday, March 11, 2014 at 9:22pm*

**Physics 141**

A 45.0-kg skater is traveling due east at a speed of 2.85 m/s. A 72.5-kg skater is moving due south at a speed of 7.35 m/s. They collide and hold on to each other after the collision, managing to move off at an angle θ south of east, with a speed of vf. Find the following...
*Tuesday, March 11, 2014 at 9:00pm*

**physics**

B. Centripetal acceleration goes inward, so it follows that centripetal force would do the same. The velocity of the horses and everything is tangent to the circular path, though.
*Tuesday, March 11, 2014 at 8:25pm*

**physics**

V = (4/3)(pi)(r)^3 V = (4/3)(pi)(2r)^3 V = (4/3)(pi)8r^3 (4/3)(pi)(8)(r)^3 ÷ (4/3)(pi)(r)^3 Everything cancels out but the 8, so the answer is A.
*Tuesday, March 11, 2014 at 8:22pm*

**math**

2. How is the graph of y = –2x² – 5 different from the graph of y = –2x²? (1 point) It is shifted 5 units up. It is shifted 5 units down. It is shifted 5 units left. It is shifted 5 units right. 3. A model rocket is launched from a roof into a large ...
*Tuesday, March 11, 2014 at 8:22pm*

**physics**

C. Matter (mass) cannot be created or destroyed, it can only change.
*Tuesday, March 11, 2014 at 8:19pm*

**physics**

The escape velocity of a bullet from the surface of planet Y is 1695 m/s. Calculate the escape velocity from the surface of the planet X if the mass of planet X is 1.37 times that of Y, and its radius is 0.887 times the radius of Y (in m/s).
*Tuesday, March 11, 2014 at 7:56pm*

**physics**

Find the speed of a satellite in a circular orbit around the earth with a radius 2.69 times the mean radius of the earth; Radius Earth= 6.37E+3km; Mass Earth= 5.98E+24kg.
*Tuesday, March 11, 2014 at 7:51pm*

**physics**

B) W = Fd (1.5 x 10^-4) = (0.37 - Fg)d (1.5)(10^-4) = (0.37 - 9.8m)d (1.5)(10^-4) = [0.37 - (9.8)(2.1)(10^-4)]d 0.00015 = 0.368d d = 0.0004076 meters A) KE + PE = KE + PE (1/2)mv^2 + (0) = (0) + mgh (1/2)mv^2 = mgh (1/2)v^2 = gh v^2 = (2)(9.8)(0.0004076) v = 0.08938 meters per...
*Tuesday, March 11, 2014 at 7:45pm*

**physics**

A 50-kg box is being pushed a distance of 7.1 m across the floor by a force whose magnitude is 175 N. The force is parallel to the displacement of the box. The coefficient of kinetic friction is 0.19. Determine the work done on the box by each of the four forces that act on ...
*Tuesday, March 11, 2014 at 7:23pm*

**physics**

M1 is a spherical mass (38.6 kg) at the origin. M2 is also a spherical mass (10.3 kg) and is located on the x-axis at x = 59.8 m. At what value of x would a third mass with a 20.0 kg mass experience no net gravitational force due to M1 and M2?
*Tuesday, March 11, 2014 at 7:22pm*

**physics **

Starting from rest, a 2.1x10-4 kg flea springs straight upward. While the flea is pushing off from the ground, the ground exerts an average upward force of 0.37 N on it. This force does 1.5x10-4 J of work on the flea. (a) What is the flea's speed when it leaves the ground...
*Tuesday, March 11, 2014 at 7:00pm*

**PHYSICS**

The model airplane in Figure 5.6 is flying at a speed of 13.6 m/s on a horizontal circle of radius 19.1 m. The mass of the plane is 1.20 kg. The person holding the guideline pulls it in until the radius of the circle becomes 10.6 m. The plane speeds up, and the tension in the ...
*Tuesday, March 11, 2014 at 6:19pm*

**Physics**

800N
*Tuesday, March 11, 2014 at 5:51pm*

**Physics**

m*g = 5.36k * 9.8N/kg = 52.53 N. = Wt. of object. a. KE = 0 J. = Initial KE V^2 = Vo^2 + 2g*h V^2 = 0 + 19.6*1 = 19.6 V = 4.43 m/s. KE = 0.5m*V^2 = 2.68*4.43^2 = 52.59 J. b. V^2 = Vo^2 + 2g*h V^2 = 4.43^2 + 19.6*1 = 39.22 V = 6.26 m/s. KEo = 2.68*4.43^2 = 52.59 J. KE = 2.68*6....
*Tuesday, March 11, 2014 at 3:16pm*

**physics**

im and Rick both can run at speed vr and walk at speed vw, with vr>vw. They set off together on a journey of distance D. Rick walks half of the distance and runs the other half. Tim walks half of the time and runs the other half
*Tuesday, March 11, 2014 at 2:54pm*

**physics**

Carmen is standing on a giant skateboard that is initially at rest. If we ignore frictional effects with the floor, what is the momentum of the skateboard if Carmon walks to the right with a momentum of 500 ? A. 500 to the right B. 500 to the left C. zero D. 500 thought it ...
*Tuesday, March 11, 2014 at 2:34pm*

**physics**

Under what conditions is mass conserved? A. Whenever the system is isolated or closed. B. Only when the change is a chemical one. C. Always. D. Only when the change is a physical one. I was thinking A.
*Tuesday, March 11, 2014 at 2:32pm*

**physics**

If Earth's mass were suddenly and magically reduced to half its present value, the Sun's gravitational force on Earth would A. be reduced by a factor of 2. B. be reduced by a factor of 4. C. increase by a factor of 2. D. remain the same. I was told it remained the same...
*Tuesday, March 11, 2014 at 2:20pm*

**physics**

22. On the surface of a certain planet, there is one unit of gravitational force exerted on every 0.4 units of mass. The gravitational field strength on this planet has numerical value A. 0.4 B. 2.5 C. 1.6 D. 1 C.1.6 is wrong
*Tuesday, March 11, 2014 at 2:18pm*

**physics**

If you double the radius of a sphere, its volume increases by what factor? A. 8 B. 6 C. 2 D. 4 I thought maybe C.2 or D.4
*Tuesday, March 11, 2014 at 2:16pm*

**physics**

Your instructor rides on a merry-go-round turning at a constant rate. In which direction does the net force on your instructor point? A. away from the center B. toward the center C. down D. tangent to the circular path I choose D.tangent to the circular path (wrong again)
*Tuesday, March 11, 2014 at 2:14pm*

**physics**

A bug rides on a phonograph record. In which direction does the change in velocity of the bug point? A. toward the center of the record B. tangent to the circular path C. away from the center of the record D. up I thought C.away from the center of the record.
*Tuesday, March 11, 2014 at 2:12pm*

**physics**

If a ball is dropped from rest, it will fall 5 m during the first second. How far will it fall during the second second? A. 15 meters B. 10 meters C. 5 meters D. 20 meters the way the question is worded it seems it should be 10meteres but I think it wants total so would it be ...
*Tuesday, March 11, 2014 at 2:09pm*

**physics**

Which of the following could be considered to be an 'accelerator' in an automobile? A. brake pedal B. gas pedal (choose this one but says wrong) C. steering wheel D. All of these can cause the car to accelerate.
*Tuesday, March 11, 2014 at 2:06pm*

**Physics**

A group of swimmers is resting in the sun on an off shore raft. They estimate that 2.9 meters separates a trough and an adjacent crest of surface waves on the lake. In addition, they count 12 crests that pass by the raft in 16 seconds. What is the Period of these waves?
*Tuesday, March 11, 2014 at 12:36pm*

**Physics**

A hiker shouts towards a vertical cliff 305 meters away. The echo is heard 1.85 seconds later. How fast did the sound wave travel in air?
*Tuesday, March 11, 2014 at 12:27pm*

**physics**

A father (m= 90 kg) and son (m= 45 kg) are standing facing each other on a frozen pond. The son pushes on the father and finds himself moving backward at 3 after they have separated. How fast is the father moving?
*Tuesday, March 11, 2014 at 12:25pm*

**physics**

A friend is making an iMovie and wants your help designing a skateboard stunt. You estimate that your friend�s mass is four times greater than that of the skateboard. For the following questions, ignore friction. In one scenario, your friend starts by standing at rest ...
*Tuesday, March 11, 2014 at 12:24pm*

**physics**

Two air-track gliders are held together with a string. The mass of glider A is twice that of glider B. A spring is tightly compressed between the gliders. The gliders are initially at rest and the spring is released by burning the string. If glider B has a speed of 3 m/s after...
*Tuesday, March 11, 2014 at 12:19pm*

**physics**

A tennis ball (m= 0.2 kg) is thrown at a brick wall. It is traveling horizontally at 16 just before hitting the wall and rebounds from the wall at 8 , still traveling horizontally. The ball is in contact with the wall for 0.04 s. What is the magnitude of the average force of ...
*Tuesday, March 11, 2014 at 12:18pm*

**physics**

A 600-kg geosynchronous satellite has an orbital radius of 6.6 Earth radii. What gravitational force does Earth exert on the satellite? A. 13.8 N B. 90.9 N C. 138 N D. 909 N
*Tuesday, March 11, 2014 at 12:13pm*

**physics**

A solid lead sphere of radius 10 m (about 66 ft across!) has a mass of about 57 million kg. If two of these spheres are floating in deep space with their centers 20 m apart, the gravitational attraction between the spheres is only 540 N (about 120 lb). How large would this ...
*Tuesday, March 11, 2014 at 12:10pm*

**physics**

An ashtray slides across a table with a speed of 0.9 and falls off the edge. If it takes 0.4 s to reach the floor, how far from the edge of the table does the ashtray land?
*Tuesday, March 11, 2014 at 12:07pm*

**physics**

What is the change in velocity if a car traveling 30{m}/{s} north slows to 20{m}/{s} north? A. 20{m}/{s} north B. 10{m}/{s} north C. 30{m}/{s} south D. 10 {m}/{s} south
*Tuesday, March 11, 2014 at 12:04pm*

**physics 1**

A 64.4-kg skateboarder starts out with a speed of 1.95 m/s. He does 119 J of work on himself by pushing with his feet against the ground. In addition, friction does -260 J of work on him. In both cases, the forces doing the work are non-conservative. The final speed of the ...
*Tuesday, March 11, 2014 at 11:59am*

**physics 1**

The model airplane in Figure 5.6 is flying at a speed of 13.6 m/s on a horizontal circle of radius 19.1 m. The mass of the plane is 1.20 kg. The person holding the guideline pulls it in until the radius of the circle becomes 10.6 m. The plane speeds up, and the tension in the ...
*Tuesday, March 11, 2014 at 11:57am*

**physics**

A sled is being pulled across a horizontal patch of snow. Friction is negligible. The pulling force points in the same direction as the sled's displacement, which is along the +x axis. As a result, the kinetic energy of the sled increases by 47.5 percent. By what ...
*Tuesday, March 11, 2014 at 11:55am*

**Physics**

A 5.0-g bullet traveling horizontally at an unknown speed hits and embeds itself in a 0.195-kg block resting on a frictionless table. The block slides into and compresses a 180-N/m spring a distance of 0.15m before stopping the block and bullet. Determine the initial speed of ...
*Tuesday, March 11, 2014 at 11:46am*

**physics**

A pole-vaulter just clears the bar at 4.07 m and falls back to the ground. The change in the vaulter's potential energy during the fall is -3900 J. What is his weight?
*Tuesday, March 11, 2014 at 11:42am*

**Physics**

A solar sail is a possble means of interplanetary travel. It uses the pressure from the sun's light to provided a force on the sail (like a regular sailboat does with wind). If the force from the sun's light on the sail is equal to 4.1 Newtons, how fast will the '...
*Tuesday, March 11, 2014 at 11:42am*

**Physics**

How fast can a car be going around a turn with radius 42.3 m if the road is covered with ice? (The μs for rubber on ice is 0.10)? Give your answer in miles per hour.
*Tuesday, March 11, 2014 at 11:41am*

**physics**

Tr = To + (-Vo)/g = 4 + (-112.8)/-9.8 = 15.51 s. = Rise time. hmax = ho + (V^2-Vo^2)/2g hmax = 225.6 + (0-(112.8)^2)/-19.6 = 1506 m. Above gnd. hmax = 0.5g*t^2 = 1506 m. 4.9t^2 = 1506 t^2 = 307.3 Tf = 17.53 s. = Fall time. T = Tr + Tf = 15.51 + 17.53 = 33.0 s. = Time in air.
*Tuesday, March 11, 2014 at 11:28am*

**Physics**

what about What is its original displacement?
*Tuesday, March 11, 2014 at 11:27am*

**Physics**

A car with a mass of 900 kg moves along a road at a 89 km/hour at equal speed. On the road is a curve with a radius of 250. a) What is the force in the curve between the tires and the road if the road is horizontal? b) What inclination is the best for that car on the road...
*Tuesday, March 11, 2014 at 11:24am*

**Physics**

1. A standard LP record has a diameter of 30 centimeters. A record on a standard turntable rotates 33.3 times a minute. What is the centripetal acceleration of a point on the edge of the record?(? m/s2) 2. If a 7.3 gram coin is placed at the very edge of the record described ...
*Tuesday, March 11, 2014 at 10:55am*

**Physics**

0.0233
*Tuesday, March 11, 2014 at 5:11am*

**physics**

A bat moving with a speed of 3.55 m/s and emitting sound of 34.0 kHz approaches a moth at rest on a tree trunk. What frequency is heard by the moth? Calculate the frequency heard by the moth when the speed of the bat is 5.55 m/s.
*Tuesday, March 11, 2014 at 2:45am*

**physics**

A stationary horn emits a 151 Hz tone. What frequency is heard by a passenger on a train which is moving towards this horn with a speed of 28.7 m/s?
*Tuesday, March 11, 2014 at 2:42am*

**College Physics**

Thanks so much!
*Tuesday, March 11, 2014 at 12:48am*

**College Physics**

F*sin(35) * 4.5=90*9.8*4.5/2 Then solve for F.
*Monday, March 10, 2014 at 11:41pm*

**Physics**

momentum = mass x velocity (52 kg)(5.0 m/s) = 260 kg-m/s
*Monday, March 10, 2014 at 11:15pm*

**physics**

F1 = (x,y) = (3.85N,-2.85N) F2 = (x,y) = (2.95N,-3.65N). a. Fr=X+Yi=(3.85+2.95) + (-2.85i-3.65i)= 6.8 - 6.5i = 9.41N[316.3o] = Resultant force. 2.10kg particle Location: (x,y) = (-2.30m,-3.60m) a(x) = Fx/mass = 6.8/2.1 = 3.24 m/s^2 Vx=Vox + a*t = 0 + 3.24*11.8= 38.21 m/s. a(y...
*Monday, March 10, 2014 at 11:06pm*

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