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April 20, 2014

April 20, 2014

**Recent Homework Questions About Physics**

Post a New Question | Current Questions

**physics**

200 cos 60
*Wednesday, November 6, 2013 at 1:55pm*

**physics**

Calculate the component of a force of 200N at a direction of 60degree to the force.
*Wednesday, November 6, 2013 at 1:41pm*

**physics**

yes
*Wednesday, November 6, 2013 at 1:18pm*

**Physics**

Horizontal components of the forces are as follows: T(sin Θ) = ma --- Equation 1 and the vertical components of the forces are T(cos Θ) = mg --- Equation 2 where T = tension in the string Θ = angle that string makes with the vertical m = mass of the object a = ...
*Wednesday, November 6, 2013 at 12:48pm*

**physics**

1.001
*Wednesday, November 6, 2013 at 11:20am*

**physics**

1.001
*Wednesday, November 6, 2013 at 11:20am*

**physics**

A fish tank has dimensions 36 cm wide by 1.0 m long by 0.60 m high. If the filter should process all the water in the tank once every 4.0 h, what should the flow speed be in the 3.0-cm-diameter input tube for the filter?
*Wednesday, November 6, 2013 at 10:36am*

**physics**

A house at the bottom of a hill is fed by a full tank of water 5.0 m deep and connected to the house by a pipe that is 110 m long at an angle of 58° from the horizontal (Fig. 13–48). (a) Determine the water gauge pressure at the house. (b) How high could the water ...
*Wednesday, November 6, 2013 at 10:36am*

**physics**

A 15-cm-long tendon was found to stretch 3.7 mm by a force of 13.4 N. The tendon was approximately round with an average diameter of 8.5 mm. Calculate Young’s modulus of this tendon.
*Wednesday, November 6, 2013 at 10:36am*

**physics**

) A uniform ladder of mass m and length leans at an angle against a frictionless wall. If the coefficient of static friction between the ladder and the ground is determine a formula for the minimum angle at which the ladder will not slip.
*Wednesday, November 6, 2013 at 10:35am*

**physics**

) A cord has two sections with linear densities of and Fig. 15–34. An incident wave, given by where x is in meters and in seconds, travels along the lighter cord. (a) What is the wavelength on the lighter section of the cord? (b) What is the tension in the cord? (c) What ...
*Wednesday, November 6, 2013 at 10:33am*

**physics**

Two children are sending signals along a cord of total mass 0.50 kg tied between tin cans with a tension of 35 N. It takes the vibrations in the string 0.50 s to go from one child to the other. How far apart are the children?
*Wednesday, November 6, 2013 at 10:32am*

**Physics ASAP PLease**

A spherical capacitor consists of a spherical conducting shell of radius b and charge -Q concentric with a smaller conducting sphere of radius a and charge +Q . Enter an expression for the capacitance of this device in terms of Coulomb's Constnat K_e (just type "k&...
*Wednesday, November 6, 2013 at 9:57am*

**Physics (help)**

A solid disk 1 with radius R1 is spinning freely about a frictionless horizontal axle l at an angular speed ω initially. The axle l is perpendicular to disk 1, and goes through the center S of disk 1. The circumference of disk 1 is pushed against the circumference of ...
*Wednesday, November 6, 2013 at 6:59am*

**physics**

120*4.4 = (120+m)*2.9 now just solve for m
*Wednesday, November 6, 2013 at 6:46am*

**PHYSICS**

there is a problem in the last answer, at the site from where this question is from.
*Wednesday, November 6, 2013 at 6:40am*

**physics**

you just want the weight of the gymnast: 56.0*9.81 = ?
*Wednesday, November 6, 2013 at 6:37am*

**What??**

physics??
*Wednesday, November 6, 2013 at 6:27am*

**physics**

http://www.physicsclassroom.com/class/circles/u6l3d.cfm
*Wednesday, November 6, 2013 at 4:08am*

**physics**

11.07
*Wednesday, November 6, 2013 at 2:25am*

**physics**

2 The instrument used for experimental determination of the value of the universal gravitational constant G is called Galilio’s telescope ballistic pendulum Newton’s balance Cavendish
*Wednesday, November 6, 2013 at 1:06am*

**physics**

In a football game, a receiver is standing still, having just caught a pass. Before he can move, a tackler, running at a velocity of +4.4 m/s, grabs him. The tackler holds onto the receiver, and the two move off together with a velocity of +2.9 m/s. The mass of the tackler is ...
*Wednesday, November 6, 2013 at 12:03am*

**Physics**

A helical spring is 59 cm long when a load of 100 N is hung from it and 62 cm long when the load is 120 N. Find its spring constant.
*Tuesday, November 5, 2013 at 11:26pm*

**PHYSICS**

The direction is 120 degrees from each of them. momentum in that direction only.. cos60*75*5.5*2 velocity= above divided by 150=5.5cos60
*Tuesday, November 5, 2013 at 9:23pm*

**Physics**

vf^2=vi^2+2ad but a=force/mass= -mu*mg/m=-mu*g the negative sign means opposite to motion. vf^2=6.2^2-2*mu*g*distance solve for distance.
*Tuesday, November 5, 2013 at 9:21pm*

**Physics**

A girl coasts down a hill on a sled, reaching a level surface at the bottom with a speed of 6.2 m/s. The coeﬃcient of kinetic friction between runners and snow is 0.059, and the girl and sled together weigh 736 N. The acceleration of gravity is 9.8 m/s^2 How far does ...
*Tuesday, November 5, 2013 at 9:16pm*

**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?
*Tuesday, November 5, 2013 at 9:04pm*

**physics**

who
*Tuesday, November 5, 2013 at 9:03pm*

**PHYSICS**

Four long, parallel conductors carry equal currents of I = 9.50 A. The current direction of the current is into the page at points A and B and out of the page at C and D. Calculate the magnitude and direction of the magnetic field at point P, located at the center of the ...
*Tuesday, November 5, 2013 at 8:24pm*

**physics**

Two people are pushing a disabled car. One exerts a force of 400 N east, the other a force of 200 N east. What is the net force exerted on the car?
*Tuesday, November 5, 2013 at 7:47pm*

**physics**

A 48.4 kg keg of beer rolls down a 2.65 m long plank leading from the flatbed of a truck 1.180 m above the ground. Determine the amount of work (in Joules) done on the keg by gravity
*Tuesday, November 5, 2013 at 7:35pm*

**physics**

A merry-go-round makes 23 revolutions in a 2.8min ride. Part A What is its average angular speed in rad/s?
*Tuesday, November 5, 2013 at 7:21pm*

**physics**

The driver of a car sets the cruise control and ties the steering wheel so that the car travels at a uniform speed of 14m/s in a circle with a diameter of 100m . Part A Through what angular distance does the car move in 4.00min ?
*Tuesday, November 5, 2013 at 7:20pm*

**Physics**

The driver of a Cadillac is traveling at a constant 60mi/hr. A police car is 20m behind the perpetrator when it too reaches 60 mi/hr and at that moment the officer floors the gas pedal. If the police car roars up to the rear of the Cadillac 2.0s later what was its acceleration...
*Tuesday, November 5, 2013 at 6:48pm*

**physics**

A cat usually lands on its feet regardless of the position from which it is dropped. A slow-motion film of a cat falling shows that the upper half of its body twists in one direction while the lower half twists in the opposite direction. (See figure below.) Why does this type ...
*Tuesday, November 5, 2013 at 6:30pm*

**physics**

My teacher needs us to formulate a question for the science fair. Till now, we have only learned the Kinematics equations, HELP, please....
*Tuesday, November 5, 2013 at 6:07pm*

**Physics**

net force= mass*acceleration mg*sinTheta-mg*mu*cosTheta=mass*a solvefor a. Notice mass divides out.
*Tuesday, November 5, 2013 at 4:26pm*

**physics**

energy, and momentum, and mass
*Tuesday, November 5, 2013 at 4:18pm*

**physics**

Which of the following properties of a ball is conserved as it falls freely in a vacuum?
*Tuesday, November 5, 2013 at 4:13pm*

**Physics **

A 59-kg person on skis is going down a hill sloped at 30° from the horizontal. The coefficient of friction between the skis and the snow is 0.10. What would be the magnitude of the acceleration?
*Tuesday, November 5, 2013 at 3:34pm*

**Physics**

d=sqrt(s₁²+s₂²) = sqrt(49+100) =12.2 km
*Tuesday, November 5, 2013 at 3:23pm*

**PHYSICS**

http://hyperphysics.phy-astr.gsu.edu/hbase/magnetic/toroid.html
*Tuesday, November 5, 2013 at 3:21pm*

**PHYSICS**

B₁= μ₀NI/2πr = 4π•10⁻⁷•800•12000/2π•0.7= … B₂= μ₀NI/2πR = 4π•10⁻⁷•800•12000/2π•1.3= …
*Tuesday, November 5, 2013 at 3:19pm*

**Physics**

A man travels 7km due north,then 10km due east.find the resultant displacement.
*Tuesday, November 5, 2013 at 3:19pm*

**physics**

titties
*Tuesday, November 5, 2013 at 3:06pm*

**physics**

titties
*Tuesday, November 5, 2013 at 3:06pm*

**physics**

I₁=6A, I₂=8 A, b=0.14 m. (a) B₁=μ₀I₁/2πb=4π•10⁻⁷•6/2π•0.14=8.57•10⁻⁶; T (b) F₂ =I₂B₁Lsinα α=90° =>sinα=1 F₂/L =I&#...
*Tuesday, November 5, 2013 at 3:04pm*

**physics**

h= v₀t + gt²/2 gt²+2v₀t-2•h = 0 9.8t²+2•10t- 2000=0 t=[20±sqrt{400+4•9.8•1000}]/2•9.8 = =(20±199)/19.6 => t=11.2 s.
*Tuesday, November 5, 2013 at 2:44pm*

**physics**

If all the solid waste of 230 million tonnes were burned in waste-to-energy power plants that are 20% efficient, a) how many kilowatt-hours of electrical energy could be produced in a year? Compare this quantity with the total U.S. electrical energy production of approximately...
*Tuesday, November 5, 2013 at 2:26pm*

**physics**

m₁=2.4 kg, m₂=1.4 kg, v₁=4.6 m/s, v₂=0 m₁v₁= (m₁+m₂) u u= m₁v₁/(m₁+m₂) =2.4•4.6/(2.4+1.4) =2.9 m/s At the edge of the table, two boxes have kinetic (KE) and potential energy (PE), and near the ground...
*Tuesday, November 5, 2013 at 2:26pm*

**physics**

If all the solid waste of 230 million tonnes were burned in waste-to-energy power plants that are 20% efficient, a) how many kilowatt-hours of electrical energy could be produced in a year? Compare this quantity with the total U.S. electrical energy production of approximately...
*Tuesday, November 5, 2013 at 2:20pm*

**physics**

5/3 as far away, so (3/5)^2 as much force.
*Tuesday, November 5, 2013 at 2:11pm*

**Physics (Please check)**

So I just want to make sure I did the math corretly: My value for angle of incidence was 20 degrees and for refraction it was 15 so I did Sin(20) / sin (15) = 1.32 which is very close to the accepted value. Is this corret?
*Tuesday, November 5, 2013 at 1:39pm*

**Physics (Please check)**

yes. I'm sure this question has come from the text section dealing with Snell's Law.
*Tuesday, November 5, 2013 at 1:02pm*

**physics**

h(t) = 1000 - 10t - 4.9t^2 Just solve for h=0
*Tuesday, November 5, 2013 at 12:07pm*

**physics**

3f/f=m1*a/m2*2a m1/m2=3/2
*Tuesday, November 5, 2013 at 11:37am*

**physics**

Net force F causes mass m1 to accelerate at rate a. A net force of 3F causes mass m2 to accelerate at rate 2a. What is the ratio of mass m1 to mass m2?
*Tuesday, November 5, 2013 at 11:17am*

**physics**

KE + PE = 480 Joules 220 + PE = 480 PE = PE = 260 J. mg*h = 260 34*9.8*h = 260 333.2h = 260 h = 0.780 m.
*Tuesday, November 5, 2013 at 11:02am*

**physics**

The answer is 0.20 use formula A = (pi*(d^2))/4 As resistivity and length are equal, they will cancel each other The ratio of resistance P to resistance Q will be 4.0. I_p = V/R_p I_Q = V/R_Q I_total = I_p + I_Q dividing I_p by I , you will get 1/5 which is equal to 0.20
*Tuesday, November 5, 2013 at 10:52am*

**physics**

A ball is released from a hot air balloon moving downward with a velocity of -10.0 meters/second and a height of 1,000 meters. How long did it take the ball to reach the surface of Earth? Given: g = -9.8 meters/second2.
*Tuesday, November 5, 2013 at 9:27am*

**physics**

A ball is released from a hot air balloon moving downward with a velocity of -10.0 meters/second and a height of 1,000 meters. How long did it take the ball to reach the surface of Earth? Given: g = -9.8 meters/second2.
*Tuesday, November 5, 2013 at 9:27am*

**physics**

A ball is released from a hot air balloon moving downward with a velocity of -10.0 meters/second and a height of 1,000 meters. How long did it take the ball to reach the surface of Earth? Given: g = -9.8 meters/second2.
*Tuesday, November 5, 2013 at 9:27am*

**physics**

In the figure, a 2.4 kg box of running shoes slides on a horizontal frictionless table and collides with a 1.4 kg box of ballet slippers initially at rest on the edge of the table, at height h = 0.75 m. The speed of the 2.4 kg box is 4.6 m/s just before the collision. If the ...
*Tuesday, November 5, 2013 at 4:12am*

**physics**

Two long, parallel conductors, separated by 14.0 cm, carry currents in the same direction. The first wire carries current I1 = 6.00 A, and the second carries I2 = 8.00 A Assume the conductors lie in the plane of the page. (a) What is the magnitude of the magnetic field created...
*Tuesday, November 5, 2013 at 1:07am*

**PHYSICS**

he magnetic coils of a tokamak fusion reactor are in the shape of a toroid having an inner radius of 0.700 m and an outer radius of 1.30 m. The toroid has 800 turns of large-diameter wire, each of which carries a current of 12.0 kA. (a) Find the magnitude of the magnetic field...
*Tuesday, November 5, 2013 at 12:53am*

**physics**

a space probe launched from earth and orbits at a distance of 15,000 m from earth's center, the gravitational force is 500 N. What is the size of force when it is 25,000 m from earth.
*Tuesday, November 5, 2013 at 12:06am*

**Physics**

A hang glider and its pilot have a total mass equal to 120 kg. While executing a 360 degree turn, the glider moves in a circle with an 8-m radius. The gliders mass is 10 m/s. a) what is the net force on the hang glider? b) What is the acceleration?
*Tuesday, November 5, 2013 at 12:04am*

**physics**

A jogger is running around a circular track of circumference 340 m. If the jogger has a speed of 11 km/h, what is the magnitude of the centripetal acceleration of the jogger?
*Monday, November 4, 2013 at 11:49pm*

**physics **

The figure shows two 1.00kg blocks connected by a rope. A second rope hangs beneath the lower block. Both ropes have a mass of 250g . The entire assembly is accelerated upward at 3.00m/s2 by force F. What is F? What is the tension at the top end of rope 1? What is the tension ...
*Monday, November 4, 2013 at 11:06pm*

**Physics (Please check)**

Calculate the index (n water) of refraction of water given the angle of incidence and the angle of refraction. I know that the accepted value for n is 1.33 but I am not sure how to calculate the index. Would I use Snell's law: na sin Qa = nb sin Qb? Thank you!
*Monday, November 4, 2013 at 11:04pm*

**Physics**

A hardworking ant must supply 0.00955 N to pull a small piece of fruit at constant velocity over a distance of 8.60 cm up a small hill to the entrance of the colony. If the coefficient of kinetic friction between the piece of fruit and the 16.2° sloped hill is 0.540, ...
*Monday, November 4, 2013 at 10:08pm*

**physics**

actually, 0.25 with sig figs is 0.3 m/s^2, which is the correct answer.
*Monday, November 4, 2013 at 10:03pm*

**physics**

since acceleration = Net force/ mass, plug in 25 N for force and 100 kg for mass you will get 0.25 m/s^2
*Monday, November 4, 2013 at 9:58pm*

**Physics**

Correction: See your 10:57 PM post.
*Monday, November 4, 2013 at 9:50pm*

**Physics**

See your 11:57 PM post.
*Monday, November 4, 2013 at 9:47pm*

**Physics**

See your 11:57 PM post.
*Monday, November 4, 2013 at 9:45pm*

**Physics**

See your 10:57 PM post.
*Monday, November 4, 2013 at 9:43pm*

**Physics**

V = Vo + g*t = 0 at max. h. 4.6 - 9.8t = 0
*Monday, November 4, 2013 at 9:39pm*

**ap physics**

189 m/s
*Monday, November 4, 2013 at 9:24pm*

**physics **

A horizontal rope is tied to a 90kg box on frictionless ice.What is the tension in the rope if the box is at rest?
*Monday, November 4, 2013 at 9:00pm*

**physics**

A girl is skipping stones across a lake. One of the stones accidentally ricochets off a toy boat that is initially at rest in the water (see the drawing below). The 0.058-kg stone strikes the boat at a velocity of 15 m/s, 15° below due east, and ricochets off at a velocity...
*Monday, November 4, 2013 at 8:41pm*

**Physics**

X + Y = 365 X - Y = -123 Sum: 2x = 233 X = 116.5 N. X + Y = 365 116.5 + Y = 365 Y = 248.5 N.
*Monday, November 4, 2013 at 7:57pm*

**Physics**

A ball thrown horizontally at 22.2 m/s from the roof of a building lands 35.0 m from the base of the building. How high is the building? I have no idea how to even start this problem. Please help!
*Monday, November 4, 2013 at 6:53pm*

**Physics**

where did the 3x/5 come from
*Monday, November 4, 2013 at 6:02pm*

**physics**

A bullet is fired horizontally at a speed of 200 m/s at a target 100m away. calculate:1)how far the bullet will have fallen when it hits the target. 2)the angle it then makes the horizontal
*Monday, November 4, 2013 at 5:37pm*

**physics**

A 34-kg girl is bouncing on a trampoline. During a certain interval after leaving the surface of the trampoline, her kinetic energy decreases to 220 J from 480 J. How high does she rise during this interval? Neglect air resistance.
*Monday, November 4, 2013 at 5:24pm*

**Physics**

V^2 = Vo^2 + 2g*h V^2 = 0 + 19.6*(53-14) = 764.4 V = 27.65 m/s at 14 m above gnd. h = Vo*t + 0.5g*t^2 = 14-2 = 12 27.65t + 0.5g*t^2 = 12 4.9t^2 + 27.65t - 12 = 0 Use Quadratic Formula and get: t = 0.405 s. To get out of the way.
*Monday, November 4, 2013 at 5:16pm*

**Physics**

conservation of angular momentum L₁=L₂ I₁ω₁=I₂ωS22; I₁/I₂=ω₂/ω₁
*Monday, November 4, 2013 at 5:08pm*

**Physics HELP!!!!**

A small ball of mass m=0.60 kg hangs from a massless string of length l= 1.2 m. The ball travels in a vertical circle and its speed at the bottom is v0= 6.0 m/s (see figure). Neglect all friction and air drag, and use g=10 m/s2 for the gravitational acceleration. The ball is ...
*Monday, November 4, 2013 at 5:07pm*

**Physics**

http://answers.yahoo.com/question/index?qid=20091116155804AA13w8n
*Monday, November 4, 2013 at 5:05pm*

**Physics - PLEASE HELP**

245 N
*Monday, November 4, 2013 at 5:00pm*

**Science**

http://www.physics.smu.edu/~scalise/apparatus/triplebeam/
*Monday, November 4, 2013 at 4:54pm*

**physics**

tension=m(g+a) b. work=tension*distance c. work=-weight*height final PE+finalKE=workdone final KE=workdone-finalpe 1/2 m v^2=m(g+a)h -mgh solve for v
*Monday, November 4, 2013 at 4:08pm*

**physics**

a. work=totalmass*g*height b. work=yourmass*g*height c.-mgh
*Monday, November 4, 2013 at 4:06pm*

**physics**

A rescue helicopter lifts a 85.8-kg person straight up by means of a cable. The person has an upward acceleration of 0.643 m/s2 and is lifted from rest through a distance of 13.1 m. (a) What is the tension in the cable? How much work is done by (b) the tension in the cable and...
*Monday, November 4, 2013 at 2:48pm*

**physics**

The concepts in this problem are similar to those in Multiple-Concept Example 4, except that the force doing the work in this problem is the tension in the cable. A rescue helicopter lifts a 85.8-kg person straight up by means of a cable. The person has an upward acceleration ...
*Monday, November 4, 2013 at 2:47pm*

**physics**

You are moving into an apartment and take the elevator to the 6th floor. Suppose your weight is 750 N and that of your belongings is 990 N. (a) Determine the work done by the elevator in lifting you and your belongings up to the 6th floor (15.2 m) at a constant velocity. (b) ...
*Monday, November 4, 2013 at 2:37pm*

**Physics**

Yes sure KS :)
*Monday, November 4, 2013 at 1:57pm*

**Physics**

Yes sure KS :)
*Monday, November 4, 2013 at 1:57pm*

**physics **

A railroad gun of mass M = 2.0 kg fires a shell of mass m =1.0 kg at an angle of theta= 35.0 with respect to the horizontal as measured relative to the gun. After the firing is complete, the final speed of the projectile relative to the gun (muzzle velocity) is v_0 =100.0 m/s...
*Monday, November 4, 2013 at 1:57pm*

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