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April 16, 2014

Homework Help: Science: Physics

Recent Homework Questions About Physics

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Physics
A 5 kg block is placed on top of a 10 kg block as shown above. A horizontal force of 45 N is applied to the 10 kg block, while the 5 kg block is tied to the wall. The coefficient of kinetic friction between the moving surfaces is 0.20. Determine (a) the tension in the string ...
Sunday, February 23, 2014 at 2:39am

Physics
A 5.1–kg block is pulled along a frictionless floor by a cord that exerts a force P = 12 N at an angle θ = 25° above the horizontal, as shown below. (a) What is the acceleration of the block? (b) The force P is slowly increased. What is the value of P just before...
Sunday, February 23, 2014 at 2:39am

Physics
A bullet of mass kg moving at 500 m⁄s embeds itself in a large, fixed piece of wood and travels 6 cm before coming to rest. Assuming that the deceleration of the bullet is constant, find the force exerted by the wood on the bullet.
Sunday, February 23, 2014 at 2:38am

Physics
Y^2 = Yo^2 + 2g*h = o Yo^2 - 19.6*(150-50) = 0 Yo^2 = 1960 Yo = 44.27 m/s. = Ver. component of the initial velocity. Vo = Yo/sin A = 44.27/sin30 = 88.54 m/s. = Initial velocity. Xo = Vo*cos A = 88.54*cos30 = 76.68 m/s. = Hor. component of initial velocity. Y = Yo + g*Tr = 0 @ ...
Saturday, February 22, 2014 at 9:30pm

Physics
A light string can support a stationary hanging load of 26.4 kg before breaking. An object of mass m = 3.19 kg attached to the string rotates on a frictionless, horizontal table in a circle of radius r = 0.795 m, and the other end of the string is held fixed as in the figure ...
Saturday, February 22, 2014 at 9:28pm

Physics
The object in the figure has a mass of 3.45 kg and is pulled up a slope AB, which is 36 m long; the height BC is 3.00 m. There is no friction and the acceleration is constant. The speed v1 at A is 3.5 m/s whereas the speed v2 at B is 5.5 m/s. The average power developed by the...
Saturday, February 22, 2014 at 8:48pm

Physics
The procedure is the same as your 8:56 PM. post.
Saturday, February 22, 2014 at 8:34pm

Physics
you are correct, a,b,c are true
Saturday, February 22, 2014 at 8:34pm

Physics
Vo = 150m/s[85o] 1. Xo = 150*cos85 = 13.07 m/s. 2. Yo = 150*sin85 = 149.4 m/s. 3. X = Xo 4. Y = 0 5. a = g = 9.8 m/s^2. 6. h = ho + (Y^2-Yo^2)/2g h = 20 + (0-149.4^2)/-19.6 = 1159 m. Above the plain. 7. Y = Yo + g*t = 0 @ peak. 149.4 -9.8t = 0 9.8t = 149.4 Tr = 15.2 s. = Rise ...
Saturday, February 22, 2014 at 8:24pm

Physics
vf=vi+at In your question, a=(27.8-0)/3.40, vi=0
Saturday, February 22, 2014 at 7:04pm

physics
Ok, figure the coefficent of friction. mu=tan41.4 you need to prove that. Then Initial KE=change in PE + workdoneonfriction let x be the distance up the plane. 1/2 m v^2=mg x*sinTheta + x*mu*mgCosTheta do the algebra, solve for x.
Saturday, February 22, 2014 at 7:03pm

physics
A block with mass m = 24.0 kg slides down an inclined plane of slope angle 41.4 ° with a constant velocity. It is then projected up the same plane with an initial speed 3.80 m/s. How far up the incline will the block move before coming to rest?
Saturday, February 22, 2014 at 6:57pm

Physics
The Lamborghini Murcielago can accelerate from 0 to 27.8 m/s (100 km/hr or 62.2 mi/hr) in a time of 3.40 seconds. How fast will the car be traveling (m/s) after 5.1 seconds.
Saturday, February 22, 2014 at 6:41pm

Physics
a = (110-77)/16 = 33/16 m/s^2 displacement during that time is s = 77*16 + 33/32 * 16^2 = 1496 m
Saturday, February 22, 2014 at 6:20pm

Physics
Determine the displacement of a plane that experiences uniform acceleration from 77 m/s to 110 m/s in 16 seconds.
Saturday, February 22, 2014 at 6:06pm

Physics
Which statements about traveling waves are TRUE? Choose all that apply. a) A traveling wave transfers energy from one point to another. b) A speaker that beams its sound forward into a small area produces a louder sound. c) The rate at which a wave transfers energy is defined ...
Saturday, February 22, 2014 at 5:11pm

Physics
The Lamborghini Murcielago can accelerate from 0 to 27.8 m/s (100 km/hr or 62.2 mi/hr) in a time of 3.40 seconds. How fast will the car be traveling (m/s) after 5.1 seconds.
Saturday, February 22, 2014 at 4:56pm

Physics
28.2+2.2*9
Saturday, February 22, 2014 at 4:56pm

Physics
You are general in the Napoleonic wars. You are on top of a plain 12m talk and you have a cannon tht can shoot a cannonball out at 350 m/s. 800 m away is a thick forest that you cannot see into but one of your scouts in a hot air balloon has just signaled to you that an enemy ...
Saturday, February 22, 2014 at 4:29pm

Physics
You are a general in the Napoleonic wars. An enemy fort 10m tall is located 1000m from your cannon. Your cannon expert is insisting that you will get the best results at an angle of 25 above the horizontal. Your cannon is located on a hill 10m tall. You have soldiers storming ...
Saturday, February 22, 2014 at 4:29pm

Physics
You are a general in the Napoleonic war. The battle has taken you to a trench 7m deep. You have a mortar that will fire an explosive at a speed of 200 m/s at an angle of 80. You have a low flying reconnaissance airplane scouting out the enemy troops at a height of 500 m. Your ...
Saturday, February 22, 2014 at 4:28pm

Physics
Suppose you are a general in the Napoleonic wars. You are no top of a plain 50 m high overlooking the enemy soldiers. You now have a brand new cannon that will decimate the enemy. Unfortunately in the christening process you used some rather cheap grade champagne and all the ...
Saturday, February 22, 2014 at 4:28pm

Physics
Tf = 5.7/2 = 2.85 s. = Fall time. h = Yo*t + 0.5g*Tf^2 h = 0 + 4.9*2.85^2 = 39.8 m.
Saturday, February 22, 2014 at 4:24pm

Physics
A car with a velocity of 28.2 m/s is accelerated uniformly at the rate of 2.2 m/s2 for 9 seconds. What is the car's final velocity?
Saturday, February 22, 2014 at 4:15pm

Physics
74-39.7/5
Saturday, February 22, 2014 at 4:09pm

Physics
Find the uniform acceleration that causes's a car's velocity to change from 39.7 m/s to 74.0 m/s in an 5 second period of time.
Saturday, February 22, 2014 at 3:50pm

physics
A missile is launched at an angle of 25 degrees to the ground. It hits a target at 301.5 meters from the point of launch. find the initial velocity
Saturday, February 22, 2014 at 3:49pm

physics
345
Saturday, February 22, 2014 at 3:22pm

physics
How to calculate the force required to move a 6.12Kg weight up a 10degree friction rig? I have done experiments on the friction rig, adding weight until the sliding weight moved, but the calculated results do not match up. Can anyone help?
Saturday, February 22, 2014 at 1:43pm

physics
A block weighing 71.5 N rests on a plane inclined at 24.1° to the horizontal. The coefficient of the static and kinetic frictions are 0.26 and 0.13 respectively. What is the minimum magnitude of the force F, parallel to the plane, that will prevent the block from slipping...
Saturday, February 22, 2014 at 1:13pm

physics
You are driving your car over a circular-shaped bump in the road that has a radius of curvature of 75.9 m. A)If the car is traveling at a constant speed of 18.3 m/s, calculate the apparent weight of your 56.1 kg passenger as you pass over the top of the bump. B)What is the ...
Saturday, February 22, 2014 at 1:00pm

physics
T = tension in rope rope horizontal force = T cos 55 = .574 T rope force up = T sin 55 = .819 T weight = m g = 310(9.81) = 3041 N normal force on ground = weight - rope force up = 3041 - .819 T friction force max = .9(3041-.819 T) F = m a .574 T - .9(3041-.819 T) = 310(6.33) ...
Saturday, February 22, 2014 at 12:02pm

physics
A box of mass 52 kg starts from rest to slide down a ramp that makes an angle of 16.6 degrees with respect to the horizontal. 4.1 seconds later, it has covered a distance of 3.98 meters. What is the coefficient of kinetic friction?
Saturday, February 22, 2014 at 11:57am

physics
.7 = a/g = a/9.81 a = 6.87 m/s^2
Saturday, February 22, 2014 at 11:56am

physics
A sled (mass 310 kg) is pulled across a stone floor with a coefficient of kinetic friction of 0.9. The rope that is used to pull it is at an angle alpha of 55 degrees with the horizontal. How hard (i.e., with what magnitude force) do you need to pull to make the sled speed up ...
Saturday, February 22, 2014 at 11:56am

physics
A professor drives off with his car (mass 850 kg), but forgot to take his coffee mug (mass 0.39 kg) off the roof. The coefficient of static friction between the mug and the roof is 0.7, and the coefficient of kinetic friction is 0.4. What is the maximum acceleration of the ...
Saturday, February 22, 2014 at 11:49am

Physics
Suppose a straight 1.60mm -diameter copper wire could just "float" horizontally in air because of the force due to the Earth's magnetic field B⃗ , which is horizontal, perpendicular to the wire, and of magnitude 4.2×10−5T . What current would ...
Saturday, February 22, 2014 at 11:26am

physics
A crate of mass 132 kg is loaded onto the back of a flatbed truck. The coefficient of static friction between the box and the truck bed is 0.22. What is the smallest radius of curvature that the truck can take without the crate slipping, if the speed with which it is going ...
Saturday, February 22, 2014 at 11:20am

physics
You are driving your car over a circular-shaped bump in the road that has a radius of curvature of 75.9 m. A)If the car is traveling at a constant speed of 18.3 m/s, calculate the apparent weight of your 56.1 kg passenger as you pass over the top of the bump. B)What is the ...
Saturday, February 22, 2014 at 11:17am

physics
NVM
Saturday, February 22, 2014 at 11:05am

physics
A string under a tension of 42.6 N is used to whirl a rock in a horizontal circle of radius 2.47 m at a speed of 19.7 m/s. The string is pulled in and the speed of the rock increases. When the string is 1.13 m long and the speed of the rock is 46.9 m/s, the string breaks. What...
Saturday, February 22, 2014 at 11:05am

physics
A block M1 of mass 16.5 kg sits on top of a larger block M2 of mass 26.5 kg which sits on a flat surface. The kinetic friction coefficient between the upper and lower block is 0.425. The kinetic friction coefficient between the lower block and the flat surface is 0.125. A ...
Saturday, February 22, 2014 at 11:03am

Physics
A man driving his car into 20.0 ft garage with a velocity of 20.0mi/h applies the brakes, producing a constant deceleration. Find the smallest deceleration necessary to avoid striking the back wall of the garage. And find how many seconds it takes for the car to come to rest
Saturday, February 22, 2014 at 9:27am

physics
calculate the final volume of gas if the original pressure of gas at STP is doubled and its temperature is 3 times.
Saturday, February 22, 2014 at 8:09am

Physics 141
acceleration=v^2/r=900/100=9 m/s^2 which is about 1 g.
Saturday, February 22, 2014 at 5:56am

Physics
frequency of oscillation... f= 1/2pi sqrt k/m a, two bungie cords doubles k, so f goes up. b. one single is half the k, so f is lower.
Saturday, February 22, 2014 at 5:55am

Physics
since weight varies as 1/distance^2, r^2/(r+d)^2 = .99 r/(r+d) = √.99 r = √.99r + √.99d r(1-√.99) = √.99 d r/d = √.99/(1-√.99) = 198.5
Saturday, February 22, 2014 at 5:45am

physics
Don't you need either angle of the string or mass of plane or velocity to answer this question?
Saturday, February 22, 2014 at 5:14am

Physics
You and some friends go bungee jumping, but you are afraid of oscillations which go too fast. Which one of these options would provide the slower oscillations? a) Tying two bungee cords to your feet such that each bungee cord is attached to your feet and the object which you ...
Saturday, February 22, 2014 at 3:51am

Physics
An object is located a distance d above the surface of a large planet of radius r. At this position, its true weight is one percent (1.000 %) less than its true weight on the surface. What is the ratio of d/r?
Friday, February 21, 2014 at 11:57pm

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?
Friday, February 21, 2014 at 11:54pm

Physics
An electric dipole is formed from two charges, ±q, spaced 1.00cm apart. The dipole is at the origin, oriented along the y-axis. The electric field strength at the point (x,y)=(0cm,10cm) is 320N/C . What is the charge q? Give your answer in nC. What is the electric field...
Friday, February 21, 2014 at 11:23pm

Physics
d
Friday, February 21, 2014 at 10:40pm

Science - Start of Physics
Please help me with the following problem. Given below is the position-time graph representing motions of two runners, Nick and Ian. Use this graph to determine which runner has greater average velocity. I can't put the graph here, so the following should give you guys a ...
Friday, February 21, 2014 at 10:37pm

Science - Start of Physics
Can you tell me why you don't understand what I am asking please?
Friday, February 21, 2014 at 10:03pm

Science - Start of Physics
All I am asking is to see if I need to explain my answer or not. I do not know if I should explain or not.
Friday, February 21, 2014 at 9:59pm

Physics 141
I just did this for you.
Friday, February 21, 2014 at 9:56pm

Physics 2
Interesting question. Do you have any thoughts on this?
Friday, February 21, 2014 at 9:56pm

Science - Start of Physics
I have no idea what you are asking. average velocity is the slope of the endpoint on the distance/time graph
Friday, February 21, 2014 at 9:56pm

Physics 141
A satellite is in a circular orbit around an unknown planet. The satellite has a speed of 1.60 104 m/s, and the radius of the orbit is 5.50 106 m. A second satellite also has a circular orbit around this same planet. The orbit of this second satellite has a radius of 8.50 106 ...
Friday, February 21, 2014 at 9:56pm

Physics
forcedown-foreceup=Ma mgSinTheta-mu*mgcosTheta=ma a= g(sinTheta-mu*cosTheta)
Friday, February 21, 2014 at 9:52pm

Physics 141
GMm1/r1^2=m1 v1^2/r1 GM=v1^2 r1 but GMm2/r2^2=m2 v2^2/r2 GM=v2^2 r2 set them equal V2^2=v1^2*r1/r2 v2= v1 sqrt (r1/r2) check my math...
Friday, February 21, 2014 at 9:50pm

Physics
Less than
Friday, February 21, 2014 at 9:04pm

Science - Start of Physics
Do you guys think I should explain how I got my answer, or do you guys think I shouldn't explain my answer? I know how to do this type of science, so if you guys say yes or no, that will be fine. Also, if you guys say yes, I will explain, but if you guys say no, I will ...
Friday, February 21, 2014 at 8:50pm

Physics 141
A satellite is in a circular orbit around an unknown planet. The satellite has a speed of 1.60 104 m/s, and the radius of the orbit is 5.50 106 m. A second satellite also has a circular orbit around this same planet. The orbit of this second satellite has a radius of 8.50 106 ...
Friday, February 21, 2014 at 8:46pm

Physics
Consider a car is heading down a 5.5° slope (one that makes an angle of 5.5° with the horizontal) under the following road conditions. You may assume that the weight of the car is evenly distributed on all four tires and that the coefficient of static friction is ...
Friday, February 21, 2014 at 8:42pm

Physics
A string going over a massless frictionless pulley connects two blocks of masses 6.4 kg and 13 kg. As shown on the picture below, the 6.4 kg block lies on a 32◦ incline; the coefficient of kinetic friction between the block and the incline is μ= 0.3. The 13 kg block...
Friday, February 21, 2014 at 8:36pm

Science - Start of Physics
I need help with the following: Given below is the position-time graph representing motions of two runners, Nick and Ian. Use this graph to determine which runner has greater average velocity. For this one, I know the answer is 2m/0s, but I don't know if they want me to ...
Friday, February 21, 2014 at 8:33pm

Physics
6.21kg---19.5kg-----> 48.4 N
Friday, February 21, 2014 at 8:30pm

Physics
A skier of mass 59.5 kg comes down a slope of constant angle 1◦ with the horizontal. The acceleration of gravity is 9.8 m/s^2 i. What is the force on the skier parallel to the slope? Answer in units of N. ii. What force normal to the slope is exerted by the skis? Answer ...
Friday, February 21, 2014 at 8:26pm

Physics
F = m g F = 2.25 * 9.8 = 22.05 N accelerated mass = m = 5.53 + 2.25 = 7.78kg a = F/m = 22.05/7.78 = 2.83 m/s^2 F on top block is force in cord F = m a = 5.53 * 2.83 = 15.7 N
Friday, February 21, 2014 at 8:13pm

Physics
1. Two blocks on a frictionless horizontal surface are connected by a light string. The acceleration of gravity is 9.8 m/s^2. Find the acceleration of the system. Answer in units of m/s^2. 2. What is the tension in the string between the blocks? Answer in units of N. 3. If ...
Friday, February 21, 2014 at 8:09pm

Physics
m g = 33 * 9.8 Newtons 2. MASS DOES NOT CHANGE !!!!!!! 3. 33 * 9.8 / 6
Friday, February 21, 2014 at 8:08pm

Physics
A block of mass 5.53 kg lies on a frictionless horizontal surface. The block is connected by a cord passing a. over a pulley to another block of mass 2.25 kg which hangs in the air. Assume the cord to be light (massless and weightless) and unstretchable and the the pulley to ...
Friday, February 21, 2014 at 8:05pm

Physics
a. An object has a mass of 33 kg. The acceleration of gravity is 9.8 m/ s^2. What is its weight on the earth? Answer in units of N. 2. What is its mass on the moon where the force of gravity is 1/6 that of the earth? Answer in units of kg. 3. What is the weight of that object ...
Friday, February 21, 2014 at 8:01pm

Physics
A dragster and driver together have mass 900.7 kg. The dragster, starting from rest, attains a speed of 25.7 m/s in 0.54 s. 1. Find the average acceleration of the dragster during this time interval. Answer in units of m/s^2. 2. What is the size of the average force on the ...
Friday, February 21, 2014 at 7:59pm

Physics
initial momentum North 800 * 18 East 800 * 18 final momentum North 1600 v sin T East 1600 v cos T (I am pretending I do not see that V = 18 sqrt 2 and T = 45 degrees) 800 * 18 = 1600 v sin T 800 * 18 = 1600 v cos T so sin T = cos T = 1/sqrt 2 That is T = 45 degrees so 800 * 18...
Friday, February 21, 2014 at 7:55pm

Physics.
c 11/3 b 8/4 a 4/5 = 8/10 reverse the last two ? d 18/20 = 9/10
Friday, February 21, 2014 at 7:46pm

physics
weight = 1.6 * 9.8 = 15.68 N T in each side of wire do right half, left the same 1/2 weight = 7.84 N half distance = 24.5 theta angle between vertical and wire Tan theta = 24.5/.149 theta = 89.65155 so cos theta = .00608152 T cos Theta = half the weight T = 7.84 N/.00608152 = ...
Friday, February 21, 2014 at 7:39pm

Physics
u = horizontal velocity = 5.7 cos 58 = 3.02 m/s forever Vi = initial speed up = 5.7 sin 58 = 4.83 m/s v = Vi - 9.8 t at top, v = o 0 = 4.83 - 9.8 t t = .493 s at top h = 1.3 + Vi t - 4.9 t^2 t at top is .493 so h at top = 1.3 + 4.83(.493)-4.9(.493)^2 = 2.49 meters above ground...
Friday, February 21, 2014 at 7:24pm

Physics
The horizontal component of velocity does not change. Ignoring friction, there is no horizontal force, therefore no acceleration, therefore constant velocity in direction with no force. THIS IS IMPORTANT ! u = 15.6 cos 56.9
Friday, February 21, 2014 at 7:16pm

Physics
A skateboarder shoots off a ramp with a velocity of 5.7 m/s, directed at an angle of 58° above the horizontal. The end of the ramp is 1.3 m above the ground. Let the x axis be parallel to the ground, the +y direction be vertically upward, and take as the origin the point ...
Friday, February 21, 2014 at 6:59pm

Physics
A volleyball is spiked so that it has an initial velocity of 15.6 m/s directed downward at an angle of 56.9 ° below the horizontal. What is the horizontal component of the ball's velocity when the opposing player fields the ball?
Friday, February 21, 2014 at 6:52pm

Physics
a = F/m F pilot = m pilot * same a
Friday, February 21, 2014 at 6:44pm

Physics
An airplane has a mass of 3.25 × 104 kg and takes off under the influence of a constant net force of 2.38 × 104 N. What is the net force that acts on the plane's 74.6-kg pilot?
Friday, February 21, 2014 at 6:39pm

physics
The distance between two telephone poles is 49 m. When a 1.6 kg bird lands on the telephone wire midway between the poles, the wire sags 0.149 m. The acceleration of gravity is 9.8 m/s2 . How much tension in the wire does the bird produce? Ignore the weight of the wire. Answer...
Friday, February 21, 2014 at 6:17pm

Physics.
From greatest to least, rank the accelerations of the boxes. C. <-5N--|3kg|--16N-> B. <-8N--|4kg|--16N-> A. <-4N--|5kg|--8N--> D. <-2N--|20kg|--20->
Friday, February 21, 2014 at 6:08pm

West Chester University
Physics.
Friday, February 21, 2014 at 6:07pm

math? physics?
Please read and follow directions.
Friday, February 21, 2014 at 5:56pm

Physics
Two automobiles, each of mass 800kg , are moving at the same speed, 18m/s , when they collide and stick together. At what speed does the wreckage move if one car was driving north and one east.
Friday, February 21, 2014 at 5:54pm

Physics
F = F1 + F2 = -9.5 + 19.5[10o] F = -9.5 + 19.5*cos10 + (19.5*sin10) F = -9.5 + 19.20 + 3.39i F = 9.7 + 3.39i a = X/m = 9.7/21 = 0.462 m/s^2.
Friday, February 21, 2014 at 4:59pm

Physics
An engineer needs to know how far a long beam will sag under a load. The table shows some results: LOAD(N): 1000 2000 3200 4400 5200 6500 SAG(cm): 2.0 4.0 6.6 8.8 10.4 13.4 a) one of the measurements for a sag is wrong. which? What should the result be? b)What would be the sag...
Friday, February 21, 2014 at 4:39pm

physics!!
A ball of mass m strikes a wall that is perpendicular to its path at speed +v and rebounds in the opposite direction with a speed –v. The impulse imparted to the ball by the wall is 1) 2mv 2)mv 3)-mv 4)zero 5)-2mv
Friday, February 21, 2014 at 3:18pm

physics
A ball of mass m strikes a wall that is perpendicular to its path at speed +v and rebounds in the opposite direction with a speed –v. The impulse imparted to the ball by the wall is
Friday, February 21, 2014 at 3:17pm

Physics 2
A beam of light is incident on a plane mirror at an angle of 35¨¬. If the mirror rotates through a small angle ¥è through what angle will the reflected ray rotate
Friday, February 21, 2014 at 2:59pm

Physics 2
An antenna is connected to a car battery. Will the antenna emit electromagnetic radiation? Why or why not? Explain where Amperes and Faradays law is concerned
Friday, February 21, 2014 at 2:58pm

Physics
Suppose the magnitude of the "drag force" acting on the falling object of mass m is Dv2. Find the expression for the magnitude of the terminal velocity of this object. (Use any variable or symbol stated above along with the following as necessary: g. Do not ...
Friday, February 21, 2014 at 2:36pm

physics
You are told that the linear "drag coefficient" due to air resistance for a particular object is 0.64 N · s/m and the object has a mass of 0.0010 kg. Find the magnitude of the terminal velocity of this object when dropped from rest. (Assume the object's ...
Friday, February 21, 2014 at 2:35pm

Physics
Sherlock Holmes examines a clue by holding his magnifying glass (with a focal length of 26.5 cm) 15.1 cm away from an object. Find the image distance. Answer in units of cm
Friday, February 21, 2014 at 2:26pm

physics
Hey, all of these are basically the same question. If you want to pass the course you better learn how to do one of them.
Friday, February 21, 2014 at 1:40pm

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