Sunday

March 1, 2015

March 1, 2015

**Recent Homework Questions About Physics**

Post a New Question | Current Questions

**Physics**

Two blocks are connected by a string on a pulley. One block is on an incline, and the other is hanging. The smooth inclined surface makes an angle of 35 ∘ with the horizontal, and the block on the incline has a mass of 5.7 kg. The mass of the hanging block is m = 4.0kg...
*Wednesday, February 25, 2015 at 12:21am*

**Physics**

two small spheres lie 1.5 meters apart and carry identical charges. How large is the charge on each if a sphere experiences a force of 2.0 N.
*Tuesday, February 24, 2015 at 11:57pm*

**physics**

A 0.125 kg mass is attached to a spring and undergoes simple harmonic motion with a pe- riod of 0.41 s. The total energy of the system is 2.5 J. Find the amplitude of the motion. Answer in units of m.
*Tuesday, February 24, 2015 at 11:11pm*

**Physics**

The bird perched on the swing shown below has a mass of 42.7 g, and the base of the swing, y = 7.54 cm below the hook, has a mass of 133 g. The swing and bird are originally at rest, and then the bird takes off horizontally at 2.04 m/s. How high will the base of the swing rise...
*Tuesday, February 24, 2015 at 11:07pm*

**Physics**

A 2050 kg car traveling at 11.0 m/s collides with a 2780 kg car that is initially at rest at the stoplight. The cars stick together and move 3.10 m before friction causes them to stop. Determine the coefficient of kinetic friction betwen the cars and the road, assuming that ...
*Tuesday, February 24, 2015 at 11:02pm*

**physics**

A block with a mass of 4.25 kg is placed at rest on a surface inclined at an angle of 44.8° above the horizontal. The coefficient of static friction between the block and the surface is 0.520, and a force of magnitude $F$ pushes upward on the block, parallel to the ...
*Tuesday, February 24, 2015 at 8:42pm*

**physics**

The half-life of carbon-14 is 5730 years. How much of a 50 g sample of carbon-14 is present after 11,460 years?
*Tuesday, February 24, 2015 at 7:57pm*

**Physics**

The crane shown in the drawing is lifting a 170-kg crate upward with an acceleration of 1.1 m/s2. The cable from the crate passes over a solid cylindrical pulley at the top of the boom. The pulley has a mass of 130 kg. The cable is then wound onto a hollow cylindrical drum ...
*Tuesday, February 24, 2015 at 6:56pm*

**Physics **

at a drag race a jet car travels 1/4 miles in 5.2 seconds. what is the final speed of the car and its acceleration?
*Tuesday, February 24, 2015 at 5:35pm*

**physics**

A golfer takes two putts to sink the ball, one is (81.6 ft, 31.7 degrees N of E) and the other is (3.20 ft, 53.4 degrees W of N). What is the displacement of the single putt that would sink the ball on the first try? Well, what I did was make a diagram of the two vectors, I ...
*Tuesday, February 24, 2015 at 4:55pm*

**Physics**

A 5.0x10^-3 m^3 container holds 4.90 g gas when the pressure is 75.0 cm Hg and the temperature is 50.0 degrees C. What will be the pressure if 6.00 g of this gas is confined to a 2.0x10^-3 m^3 container at 0.0 degrees C? Do I simply need to use the combined gas law or does the...
*Tuesday, February 24, 2015 at 4:34pm*

**Physics**

A charge of +444 μC is fixed at the center of a square that is 0.47 m on a side. How much work is done by the electric force as a charge of +5.8 μC is moved from one corner of the square to any other empty corner?
*Tuesday, February 24, 2015 at 2:59pm*

**Physics**

An 80-ft-diameter Ferris wheel rotates once every 23s. What is the apparent weight of a 80kg passenger at the lowest point of the circle? Express your answer in SI units. I know to use the equation mg-N=m(v^(2)/r) but I can't figure out how to come away with the apparent ...
*Tuesday, February 24, 2015 at 2:44pm*

**physics**

A racing cyclist accelerates 5m/s² when she starts from rest. The total mass of the cyclist and her bicycle is 45kg. Calculate the resultant force that produces this acceleration
*Tuesday, February 24, 2015 at 2:13pm*

**physics**

Tires on a car have a diameter of 2 ft and are warranted for 60 000 miles. a) Determine the angle (in radians) through which one of these tires will rotate during the warranty period. b) How m,any revolutions of the tire are equivalent to your answer in, part a)? i have drawn ...
*Tuesday, February 24, 2015 at 12:07pm*

**Physics**

The HCl molecule consists of a hydrogen atom (mass 1u) and a chlorine atom (mass 35u). The centres of the two atoms are separated by 127pm (=1.27x10-10m). What is the moment of inertia, I, about an axis perpendicular to the line joining the two atoms which passes through the ...
*Tuesday, February 24, 2015 at 12:00pm*

**Physics**

A flight controller determines that an airplane is 34.0mi south of him. Half an hour later, the same plane is 42.0mi northwest of him. The general direction of the airplane’s velocity is? If the plane is flying with constant velocity, what is the direction of its velocity...
*Tuesday, February 24, 2015 at 11:39am*

**physics**

when an aluminim is immersed in water it displaces 5 kg of water .how is the bouyant force acting on the aluminium object in newtons?(g=10m/s)
*Tuesday, February 24, 2015 at 11:08am*

**Physics**

A uniform 12 kg ladder 2.8 m long rests against a vertical frictionless wall with it's lower end 1.1 m from the wall, if the ladder is to stay in place. What must be minimum coefficient of friction between the bottom of the ladder and the ground
*Tuesday, February 24, 2015 at 10:24am*

**Physics**

A 2160 kg car traveling at 10.5 m/s collides with a 2740 kg car that is initially at rest at the stoplight. The cars stick together and move 4.00 m before friction causes them to stop. Determine the coefficient of kinetic friction betwen the cars and the road, assuming that ...
*Tuesday, February 24, 2015 at 8:28am*

**physics**

In an arcade game, a 0.18 kg disk is shot across a frictionless horizontal surface by being compressed against a spring and then released. If the spring has a spring constant of 237 N/m and is compressed from its equilibrium position by 6.6 cm, what is the magnitude of the ...
*Tuesday, February 24, 2015 at 8:00am*

**Physics**

A thin insulating rod with charge density +5nC/m is arranged inside a thin conducting cylindrical shell of radius R=3cm. The rod and shell are on the same axis, and you can assume they are both infinite in length. What is the surface charge density induced on the outside of ...
*Tuesday, February 24, 2015 at 7:21am*

**physics**

A 21.0-kg child descends a slide 2.20m high and reaches the bottom with a speed of 1.40m/s . How much thermal energy due to friction was generated in this process?
*Monday, February 23, 2015 at 11:37pm*

**physics**

The coefficients of static and kinetic friction between a 43 kg box and a horizontal surface are 0.72 and 0.20, respectively. (a) What is the acceleration of the object if a 135 N horizontal force is applied to the box? (b) What is the acceleration if the applied force is 480 N
*Monday, February 23, 2015 at 10:40pm*

**Physics**

After a snowstorm a boy and girl decide to have a snowball fight. The girl uses a large slingshot to shoot snowballs at the boy. Assume that the girl fires each snowball at an angle 0 from the ground and that the snowball travel with an initial velocity of V0.. 1.in terms of ...
*Monday, February 23, 2015 at 10:11pm*

**Physics**

Please help due in less than 2 hours!! A person whose mass is m = 86.0 kg steps on a mechanical bathroom scale placed on an inclined plane that makes the angle α = 21.3° with the horizontal. What is the reading on the scale? i've tried m*g*sin(21.3) and it still ...
*Monday, February 23, 2015 at 9:48pm*

**Physics**

A cube of mass m1 = 6.8 kg is sitting on top of another cube of the same size and mass m2 = 0.7 kg while they are both in free-fall. Ignoring any air resistance, what is the magnitude of the normal force with which the bottom cube is acting on the top cube? I've tried ...
*Monday, February 23, 2015 at 9:10pm*

**physics**

What is the force a rock exerts if it's mass is 36,000 kg and the acceleration due to Gravity is 9.8 m/s2
*Monday, February 23, 2015 at 8:42pm*

**physics**

A piece of wire is wound exactly 100 times around a circular tube with a radius of 9.8 centimeters. Find the length of the piece of wire in meters.
*Monday, February 23, 2015 at 7:55pm*

**physics**

In being served, a tennis ball is accelerated from rest to a speed of 25.5 m/s. The average power generated during the serve is 2920 W. Assuming that the acceleration of the ball is constant during the serve, find the force acting on the ball.
*Monday, February 23, 2015 at 7:36pm*

**Physics**

A plane is flying 250 m/s west with a crosswind of 25 m/s north affecting the flight. What is the magnitude and direction of the plane?
*Monday, February 23, 2015 at 6:47pm*

**Physics**

An object experiences a constant acceleration of 4.0 m/s2 along the −x axis for 4s, obtaining a velocity of 31 m/s in a direction 30° from the +x axis. Find the initial velocity vector of the object. (The angle of the object is measured counterclockwise from the +x-...
*Monday, February 23, 2015 at 6:40pm*

**physics**

In a region where the electric field is constant, as it is between two oppositely charged parallel plates, is the voltage also constant?
*Monday, February 23, 2015 at 6:29pm*

**physics**

Two carts are involved in an elastic collision. Cart A with mass 0.55 kg is moving towards Cart B with mass 0.55 kg, which is initially at rest. Cart A stops after the collision and Cart B begins to move. What is the final kinetic energy of Cart B?
*Monday, February 23, 2015 at 5:24pm*

**physics**

The Speed By Which A Sound Travels In A Water Of Depth 300m,is 216km/h.Calculate The Time Taken By The Sound At That Depth.
*Monday, February 23, 2015 at 4:26pm*

**physics**

Calculate the distance between the center of the earth and the center of the moon at which the gravitational force exerted by the earth on an object is equal in magnitude to the force exerted by the moon on the object.
*Monday, February 23, 2015 at 4:00pm*

**physics**

A car traveling at 20 m/s stops in a distance of 50 m. Assume that the deceleration is constant. The coefficients of friction between a passenger and the seat are µs = 0.5 and µk = 0.03. Will a 70-kg passenger slide off the seat if not wearing a seat belt?
*Monday, February 23, 2015 at 3:45pm*

**Physics**

A garden roller is kept at rest on a slope that makes an angle of 30 degrees the horizontal by an upward force of 2 500N parallel to the slope. 1. Calculate the mass of the roller? 2. Determine the magnitude of the force exerted by the surface on the roller?
*Monday, February 23, 2015 at 3:19pm*

**Physics**

A 5.5 kg block is released from rest on a frictionless inclined plane making an angle of 23.3° with the horizontal. Calculate the time it will take this block when released from rest to travel a distance of 0.7 m along the ramp.
*Monday, February 23, 2015 at 1:30pm*

**physics**

A ball which is at rest is dropped from a hight h meter as it bound off the flour its speed is 80% of what it was just before touching the ground the ball will rise nearly to rise of
*Monday, February 23, 2015 at 12:16pm*

**physics**

Water flows over the edge of a waterfall at a rate of 1.2 x 106 kg/s. There are 50.0 m between the top and bottom of the waterfall. How much power is generated by the falling water by the time it reaches bottom?
*Monday, February 23, 2015 at 11:36am*

**Physics**

The magnitude of the velocity of a projectile when it is at its maximum height above ground level is 12 m/s. (a) What is the magnitude of the velocity of the projectile 1.7 s before it achieves its maximum height? (b) What is the magnitude of the velocity of the projectile 1.7...
*Monday, February 23, 2015 at 9:56am*

**physics**

how much heat must be removed from 14 lbs of aluminum block in order to cool it from 80 degrees fahrenheit to 15 degrees fahrenheit?
*Monday, February 23, 2015 at 7:34am*

**physics**

why we derive our hands upwards and backwards to catch the ball?
*Monday, February 23, 2015 at 6:20am*

**Physics**

How to determine the work done on the object with a FCosTheta(Y axis)-Displacement(X axis) graph.
*Monday, February 23, 2015 at 1:06am*

**physics**

Stuck on solving for unknowns in part F and G help please? a) the upper loop 1 18I12+ 13I18=30 (b) the lower loop 2 =5.00I36 - 18I12= 24 (c) the node on the left side 3 I12+I36=I18 (d) Solve the node equation for I36. 4 I12 - I18 =I36 e) Using the equation found in (d), ...
*Monday, February 23, 2015 at 12:39am*

**physics(waves)**

A wave has a speed of 340m/s and a period of 0.28ms. what's the wavelength? so I worked this and I got 95.2m but the answer to d question says 0.095m. period(T) = 1/F (since F = 1/T) therefore, F = 1/0.28 = 3.5714 wavelength = velocity/frequency w = 340/3.5714 = 95.2m (Isn...
*Monday, February 23, 2015 at 12:16am*

**Physics**

A bead slides without friction around a loopthe-loop. The bead is released from a height of 18.9 m from the bottom of the looptheloop which has a radius 7 m. The acceleration of gravity is 9.8 m/s^2. What is its speed at point A ? Answer in units of m/s.
*Monday, February 23, 2015 at 12:00am*

**physics**

A proton has an initial speed of 7·105 m/s. It is brought to rest by an electric field. a.) What is the magnitude of the voltage difference needed to bring this charge to rest? answer: 365.313*7v, WHY
*Sunday, February 22, 2015 at 11:22pm*

**Physics**

Your car is in a ditch. It requires 4500 N of force to get out of the ditch but you can only push with 750 N. What is the angle the rope needs to make, relative to straight across the road for you to be able to get the car out of the ditch? What is actually pulling the car out?
*Sunday, February 22, 2015 at 10:54pm*

**physics**

You are skiing and have a mass of 47 kg and are on a slope making an angle of 37 degrees above horizontal. The coefficient of kinetic friction between the skis and the snow is 0.18. What is the amount of force pulling you down the slope? What is your acceleration down the slope?
*Sunday, February 22, 2015 at 9:54pm*

**physics**

how do i figure the momentum of a 8.2 kg cannon ball moving at 9.3 m/s
*Sunday, February 22, 2015 at 9:46pm*

**physics**

A 74-kg fisherman in a 129-kg boat throws a package of mass m = 15 kg horizontally toward the right with a speed of vi = 4.7 m/s as in the figure below. Neglecting water resistance, and assuming the boat is at rest before the package is thrown, find the velocity of the boat ...
*Sunday, February 22, 2015 at 8:02pm*

**Physics**

In class, we've been working on moment of inertia and recently did a lab regarding its usage. I don't feel too confident with the material yet and was hoping someone could look over my work and offer advice on what to do. We used solid spheres in the lab (2/5mr^2 used...
*Sunday, February 22, 2015 at 7:56pm*

**physics**

In a popular amusement park ride, a rotating cylinder of radius R = 2.60 m is set in rotation at an angular speed of 4.00 rad/s, as in the figure shown below. The floor then drops away, leaving the riders suspended against the wall in a vertical position. What minimum ...
*Sunday, February 22, 2015 at 7:47pm*

**physics**

A satellite is in a circular orbit around the Earth at an altitude of 3.30 106 m. (a) Find the period of the orbit. (Hint: Modify Kepler's third law so it is suitable for objects orbiting the Earth rather than the Sun. The radius of the Earth is 6.38 106 m, and the mass of...
*Sunday, February 22, 2015 at 7:45pm*

**physics**

After the Sun exhausts its nuclear fuel, its ultimate fate may be to collapse to a white dwarf state. In this state, it would have approximately the same mass as it has now, but its radius would be equal to the radius of the Earth. (a) Calculate the average density of the ...
*Sunday, February 22, 2015 at 7:44pm*

**physics**

A 3.42-kg steel ball strikes a massive wall at 10.0 m/s at an angle of θ = 60.0° with the plane of the wall. It bounces off the wall with the same speed and angle. If the ball is in contact with the wall for 0.170 s, what is the average force exerted by the wall on ...
*Sunday, February 22, 2015 at 7:32pm*

**ap physics**

A force of magnitude Fx acting in the x-direction on a 2.55-kg particle varies in time as shown in the figure below. (Indicate the direction with the sign of your answer.) (a) Find the impulse of the force. (Give your answer to one decimal place.) kg · m/s (b) Find the ...
*Sunday, February 22, 2015 at 7:24pm*

**AP physics**

A 0.278-kg volleyball approaches a player horizontally with a speed of 16.2 m/s. The player strikes the ball with her fist and causes the ball to move in the opposite direction with a speed of 22.4 m/s. (a) What impulse is delivered to the ball by the player? (Take the ...
*Sunday, February 22, 2015 at 7:19pm*

**physics**

friction between tires and pavement supplies the centripetal acceleration necessary for a car to turn. Using the coefficients of friction for rubber on concrete calculate the maximum speed at which a car can round a turn of radius 30 m (a) when the road is dry; (b) when the ...
*Sunday, February 22, 2015 at 6:09pm*

**Physics**

This one has been confusing me, can someone walk me through it? I'd like to know which formulas I need to use and everything. A 121.0 -kg crate is sitting at rest on a ramp leading to the back of a truck. a) How many forces are acting on the crate while it is at rest? b) ...
*Sunday, February 22, 2015 at 5:37pm*

**Physics**

Hey! I've tried using equations such as weight=m*g for this problem, but I don't think I'm doing it right. Can someone help? A helicopter was seen carrying a heavy bag of sand (1210.0 kg). A student figured that the acceleration of the sand bag then was 1.4 m/s2 in...
*Sunday, February 22, 2015 at 5:00pm*

**Physics**

A 65.0 kg skier with an initial speed of 11.0 m/s coasts up a 2.50 m high rise as shown in Figure 6.23. Find his final speed at the top, given that the coefficient of friction between her skis and the snow is 0.0800.
*Sunday, February 22, 2015 at 4:15pm*

**physics**

Joel is walking down a street and sees a 115 ft tall building in front of him. He stops 190 feet from the base of the building at the tip of the building's shadow. Round answers to three decimal places.
*Sunday, February 22, 2015 at 4:11pm*

**Physics**

At an accident scene on a level road, investigators measure a car's skid mark to be 68 m long. It was a rainy day and the coefficient of friction was estimated to be 0.40. Using the work-energy theorem determine the speed of the car when the driver slammed on (and locked) ...
*Sunday, February 22, 2015 at 4:11pm*

**Physics**

A rescue helicopter lifts a 70 kg person straight up by means of a cable. The person has an upward acceleration of 0.70 m/s2 and is lifted from rest through a distance of 9 m. What is the tension in the cable? How much work is done by the tension in the cable...
*Sunday, February 22, 2015 at 4:11pm*

**physics/chemistry**

how does one calculate the work done by a spherical bubble with radius r in a liquid with a surface tension of T. I understand for a cavity it is 8pi(r)T, would you just double it to get 16pi(r)T because there are 2 films? here's the math....2(4pi((r)+dr)^2 -4pir^2) for a ...
*Sunday, February 22, 2015 at 2:39pm*

**Physics**

Two blocks, stacked one on top of the other, slide on a frictionless horizontal surface. The surface between the two blocks is rough, however, with a coefficient of static friction equal to 0.50. The top block has a mass of 2.6 kg, and the bottom block's mass is 4.0 kg. If...
*Sunday, February 22, 2015 at 2:34pm*

**physics -PLS HELP ASAP**

a bungee jumper is falling at a velocity of 2m/s [down] when the bungee cord just starts to stretch. after the cord stretches for 2.5s, the velocity is 11m [down]. assume that the acceleration is at constant. a) what is the acceleration of the jumper? b) what is the total time...
*Sunday, February 22, 2015 at 2:29pm*

**Physics**

The spring on a popgun obeys Hooke's law and requires a force of 220 N to compress it 12.0 cm to its!@#$%^&ed position. How much energy is stores in the!@#$%^&ed spring?
*Sunday, February 22, 2015 at 1:59pm*

**Physics**

The spring on a popgun obeys Hooke's law and requires a force of 220 N to compress it 12.0 cm to its!@#$%^&ed position. How much energy is stores in the!@#$%^&ed spring?
*Sunday, February 22, 2015 at 1:59pm*

**Physics**

The spring on a popgun obeys Hooke's law and requires a force of 220 N to compress it 12.0 cm to its!@#$%^&ed position. How much energy is stores in the!@#$%^&ed spring?
*Sunday, February 22, 2015 at 1:59pm*

**Physics**

62m of skid marks and coefficient of .75, how fast was the car going?
*Sunday, February 22, 2015 at 1:58pm*

**physics**

A ball dropped onto a floor from a height of 5m rises to a height of 2m after 3 bounces.What is the coefficient of restitution.? i know that e=(velocity of ball after 1st impact )/(velocity with which the ball strikes the floor).But will the no. of bounces effect the value of ...
*Sunday, February 22, 2015 at 8:43am*

**physics**

A 3.49 rad/s (33 rpm) record has a 5.99-kHz tone cut in the groove. If the groove is located 0.100 m from the center of the record, what is the "wavelength" in the groove?
*Sunday, February 22, 2015 at 8:35am*

**College Physics**

where must a 500 N weight be hung on a uniform beam w/ a length of 5 m and weighs 150 N so that the girl standing on the other end is 1/4 as much as the boy standing at the other end?
*Sunday, February 22, 2015 at 5:19am*

**Physics Urgent!!**

a bungee jumper is falling at a velocity of 2m/s [down] when the bungee cord just starts to stretch. after the cord stretches for 2.5s, the velocity is 11m [down]. assume that the acceleration is at constant. a) what is the acceleration of the jumper? b) what is the total time...
*Sunday, February 22, 2015 at 3:29am*

**physics**

A lead pellet is propelled vertically upward by an air rifle so that its initial speed is 49 m/sec. Find its total time of flight.
*Sunday, February 22, 2015 at 3:26am*

**Physics**

A 25.0 m tall hollow aluminum flagpole is equivalent in strength to a solid cylinder of aluminum 3.50 cm in diameter. A strong wind bends the pole much as a horizontal force of 900 N exerted at the top would. How far to the side does the top of the pole flex? I am almost 100% ...
*Saturday, February 21, 2015 at 9:22pm*

**Physics**

A 70 kg person is having a tug-of-war. The rope is horizontal and 1.3 m above the ground. This person’s center of mass is 1.0 m from the ground when he is in an upright standing position. If the force his opponent exerts on the rope is 400 N, what angle must the person be...
*Saturday, February 21, 2015 at 8:15pm*

**physics**

A 3.9kg block moving at 2.0 m/s toward the west on a frictionless surface has an elastic head-on collision with a second 0.80kg block traveling east at 3.0 m/s. a)Determine the final velocity of first block. Assume due east direction is positive. b)Determine the final velocity...
*Saturday, February 21, 2015 at 6:26pm*

**physics**

Estimate the change in gravitational potential energy when a person with mass 95kg rise from bed to a standing position. Assuming that the center of mass of a person is elevated by approximately Δh=0.50m.
*Saturday, February 21, 2015 at 5:35pm*

**physics**

state coulombs law
*Saturday, February 21, 2015 at 2:35pm*

**physics **

Two arrows are fired horizontally with the same speed of 31.8 m/s. Each arrow has a mass of 0.149 kg. One is fired due east and the other due south. Find the magnitude of the total momentum of the two arrow system in kg-m/s. (Hint: How do you combine vector arrows at right ...
*Saturday, February 21, 2015 at 2:28pm*

**physics**

A shuffleboard disk is accelerated at a 9.7m/s^2 from rest to a speed of 6.0m/s. What distance does the disk travel?
*Saturday, February 21, 2015 at 2:23pm*

**ap physics**

A 0.461 kg mass is attached to a spring and executes simple harmonic motion with a pe- riod of 0.59 s. The total energy of the system is 2.4 J. Find the force constant of the spring
*Saturday, February 21, 2015 at 1:21pm*

**physics**

A bicycle has wheels with a diameter of 0.570 m. It accelerates uniformly and the rate of rotation of its wheels increases from 181 rpm to 260 rpm in a time of 19.9 s. Find the linear acceleration of the bicycle. i tried converting everything to linear to use a linear equation...
*Saturday, February 21, 2015 at 11:50am*

**Physics**

Three capacitors (3.83, 5.89, and 12.9 μF) are connected in series across a 58.0 V battery. Calculate the voltage across the 3.83 μF capacitor.
*Saturday, February 21, 2015 at 10:33am*

**College Physics**

A 3.0 m long light board with negligible weight is supported at each end by cables. a painter weighing 900 N stands 1.o m from the left cable. Find the tension in each cable.
*Saturday, February 21, 2015 at 10:16am*

**college physics**

a 3m long light board with negligible weight is supported at each end by cables. a painter weighing 900 N stands 1m from the left cable. find the tension in each cable,
*Saturday, February 21, 2015 at 10:10am*

**Physics**

The same voltage is applied between the plates of two different capacitors. When used with capacitor A, this voltage causes the capacitor to store 17 μC of charge and 5.7 x 10^-5 J of energy. When used with capacitor B, which has a capacitance of 6.9 μF, this voltage...
*Saturday, February 21, 2015 at 8:02am*

**Physics**

Two identical capacitors store different amounts of energy: capacitor A stores 2.5 x 10^-3 J, and capacitor B stores 4.8 x 10^-4 J. The voltage across the plates of capacitor B is 12 V. Find the voltage across the plates of capacitor A.
*Saturday, February 21, 2015 at 8:01am*

**Physics**

What is the capacitance of a capacitor that stores 5.2 μC of charge on its plates when a voltage of 4.8 V is applied between them?
*Saturday, February 21, 2015 at 8:00am*

**Physics**

A certain force gives mass m1 an acceleration of 13.0 m/s2 and mass m2 an acceleration of 3.6 m/s2. 1) What acceleration would the force give to an object with a mass of (m2-m1)? 2) A certain force gives mass m1 an acceleration of 13.0 m/s2 and mass m2 an acceleration of 3.6 m...
*Saturday, February 21, 2015 at 5:24am*

**Physics**

A 5.0- kg concrete block rests on a level table. A 3.7- kg mass is attached to the block by a string passing over a light, frictionless pulley. If the acceleration of the block is measured to be 1.0 m/s2, what is the coefficient of friction between the block and the table?
*Saturday, February 21, 2015 at 5:21am*

**physics**

A ball is thrown straight up from the ground at 10m/s, and simultaneously a ball is thrown straight down a 10m-high ledge at 10m/s. At what height do the two balls pass?
*Saturday, February 21, 2015 at 3:16am*

**physics**

If a person weighs 700N on Earth, what force due to gravity would they exert on a 1500kg car they are standing 1.5m from? Assume the distance is between their centres of mass. F=Gm1xm2/r^2?
*Friday, February 20, 2015 at 11:34pm*

**Physics**

on a perfect fall day you are hovering at rest at low altitude in a hot air balloon the total weight of the balloon including its load and the hot air in it is 15,000N find the volume of the displaced air I have no Idea how to go about this
*Friday, February 20, 2015 at 9:48pm*

**Physics**

Three capacitors (3.83, 5.89, and 12.9 μF) are connected in series across a 58.0 V battery. Calculate the voltage across the 3.83 μF capacitor.
*Friday, February 20, 2015 at 9:46pm*

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