Wednesday

July 29, 2015

July 29, 2015

**physics **

For non-conservative forces, the work done does depend upon the path taken. True or False?
*Monday, April 15, 2013 by kelsi*

**physics**

The work done by non-conservative forces is equal to the total change in kinetic and potential energy. True or False?
*Monday, April 15, 2013 by kelsi*

**physics**

A radio station on the surface of the earth radiates an EM-wave with an average total power of 50 kilo-watts. Assuming the transmitter radiates equally in all directions (not in real life), find the amplitudes Emax and Bmax detected by a satellite at a distance of 100km from ...
*Monday, April 15, 2013 by Dan*

**Physics**

An electric space heater draws 15.5 A from a 120 V source. It is operated, on the average, for 4.0 h each day. (b) How much energy in kWh does in consume in 30 days? (c) At 11 per kWh, how much does it cost to operate the heater for 30 days?
*Monday, April 15, 2013 by Billy*

**Physics**

Vector A is described as having magnitude -7 and angle 30degress. Which is an equivaent statement of magnitude and angle of vector A? (Note: All angles are measured counterclockwise from x-axis.)
*Monday, April 15, 2013 by Eaden*

**physics**

A wagon is being pushed by a small child along a sidewalk. If the wagon has a mass of 8kg, a coefficient of friction of 0.3 and is accelerating at 0.2m/s what force is the child applying
*Monday, April 15, 2013 by Rosie*

**physics**

A 2.4-kg cart is rolling along a frictionless, horizontal track towards a 1.3-kg cart that is held initially at rest. The carts are loaded with strong magnets that cause them to attract one another. Thus, the speed of each cart increases. At a certain instant before the carts ...
*Monday, April 15, 2013 by Anonymous*

**physics**

A skier starts from rest at the top of a hill. The skier coasts down the hill and up a second hill, as the drawing illustrates. The crest of the second hill is circular, with a radius of 39.6 m. Neglect friction and air resistance. What must be the height h of the first hill ...
*Monday, April 15, 2013 by Anonymous*

**physics**

A semi-trailer is coasting downhill along a mountain highway when its brakes fail. The driver pulls onto a runaway truck ramp that is inclined at an angle of 19.0° above the horizontal. The semi-trailer coasts to a stop after traveling 170 m along the ramp. What was the ...
*Monday, April 15, 2013 by Anonymous*

**physics**

An object with a charge of +6.0 µC is 0.30 m from a second object and experiences an attractive force of 1.80 N. What is the magnitude of the charge on the second object? (µC = 1.0 × 10-6 C) (Answer: -3.0 µC) The answer is provided but I don't know ...
*Monday, April 15, 2013 by traevon*

**Physics **

36.A 50.0-kg block and 100-kg block are connected by a string. The pulley is frictionless and of negligible mass. The coefficient of kinetic friction between the 50-kg block and incline is 0.250. Determine the change in the kinetic energy of the 50-kg block as it moves ...
*Monday, April 15, 2013 by Noor*

**Physics**

A solenoid is 3.2 m long and has 500 turns per meter. What is the cross-sectional area of this solenoid if it stores 0.32 J of energy when it carries a current of 12 A? So I used L = 2*E / I^2; and then I used A = L*l / (uo * N^2) but my answer isn't coming out right at ...
*Sunday, April 14, 2013 by Valerie*

**Physics**

A 100 W lamp is connected to 120 V, and its current is measured. A resistor is added to the lamp to reduce the current to half its original value. (a) What is the potential difference across the lamp? (b) How much resistance was added to the circuit? (c) How much power is now ...
*Sunday, April 14, 2013 by Billy*

**Physics**

A circuit contains six 270 lamps and a 18.0 heater connected in parallel. The voltage across the circuit is 120 V. (a) What is the current in the circuit when four lamps are turned on? (b) What is the current in the circuit when all lamps are on? (c) What is the current in the...
*Sunday, April 14, 2013 by Billy*

**Physics**

A transistor radio operates by means of a 9.0 V battery that supplies it with a 40 mA current. (a) If the cost of the battery is $0.50 and it lasts for 300 h, what is the cost per kWh to operate the radio in this manner? (b) The same radio, by means of a converter, is plugged ...
*Sunday, April 14, 2013 by Billy*

**physics**

The L-shaped object in the figure below consists of three masses (m1 = 8.90 kg, m2 = 1.16 kg and m3 = 2.40 kg) connected by light rods of length L1 = 1.29 m and L2 = 1.86 m.What torque must be applied to this object to give it an angular acceleration of 1.46 rad/s2 if it is ...
*Sunday, April 14, 2013 by Anonymous*

**physics**

Car A negotiates a curve of 60 m radius at a constant speed of 50 km/h. When A passes the position shown, car B is 30 m from the intersection and is accelerating south toward the intersection at the rate of 1.5 m/s2. Determine the acceleration which A appears to have when ...
*Sunday, April 14, 2013 by nelly*

**Physics**

A satellite circling the earth completes each orbit in 5.10 x 10^3 s. What is the gravitational field strength @ the location of the satellite's orbit?
*Sunday, April 14, 2013 by Dal*

**physics**

Hm0 dug b00b pass taik pay 0ff.blue medcare x x1234567.sead h0sp.c0rr c0urt p0lice 0rder uint die c0de c0rr bylay
*Sunday, April 14, 2013 by Anonymous*

**physics**

Hm0 dug b00b pass taik pay 0ff.blue medcare x x1234567.sead h0sp
*Sunday, April 14, 2013 by Anonymous*

**PHYSICS**

A 40 kg child stand on one end of a 70 kg canoe hat is 4 m in length. The boat is initially 3 m from a dock. The child notcies a turtle on a arock near the far en of the canoe so she proceeds to walk to the far ed off the canoe o get the turtle. a) neglecting any friction, ...
*Sunday, April 14, 2013 by y*

**Physics**

Consider the RL circuit shown in the figure, where R = 5.0 Ω and L = 4.6 H. How much energy is stored in the inductor after the switch has been closed a long time? I would know how to do this if they actually gave me a value for time, but I'm lost now. Can someone ...
*Sunday, April 14, 2013 by Valerie*

**Physics**

150kg cart is traveling right 3m/s. a 20kg block of coal comes from the cart at 38degrees below the horizontal. The new velocity of the cart with the block is 3.95m/s. What is the initial speed of the coal.
*Sunday, April 14, 2013 by Frustrated*

**physics grade 12.**

A spring is extended by 4mm when a load of 2.N was applied. a)What is its spring constant? b)How much would it extend if a losd of 150g was suspended from it?
*Sunday, April 14, 2013 by Tangeni.*

**physics**

A spring is extended 4mm by an applied force of 2.0N. a)What is its spring constant? b)How much would it extend if a load of 150g was suspended from it?
*Sunday, April 14, 2013 by Tangeni.*

**physics**

A spring is extended 4mm by an applied force of 2.0N. a)What is its spring constant? b)How much would it extend if a load of 150g was suspended from it?
*Sunday, April 14, 2013 by Tangeni.*

**physics**

A 46.7-g golf ball is driven from the tee with an initial speed of 55.5 m/s and rises to a height of 25.9 m. (a) Neglect air resistance and determine the kinetic energy of the ball at its highest point. (b) What is its speed when it is 5.85 m below its highest point?
*Sunday, April 14, 2013 by Anonymous*

**Physics**

A satellite circling the earth completes each orbit in 5.10 x 10^3 s. What is the gravitational field strength @ the location of the satellite's orbit?
*Sunday, April 14, 2013 by Dal*

**Physics**

A rotating uniform-density disk of radius 0.6 m is mounted in the vertical plane. The axle is held up by supports that are not shown, and the disk is free to rotate on the nearly frictionless axle. The disk has mass 5.8 kg. A lump of clay with mass 0.5 kg falls and sticks to ...
*Sunday, April 14, 2013 by Emily*

**Physics**

11-098-satellite_and_junk.jpg A spherical satellite of radius 4.6 m and mass M = 195 kg is originally moving with velocity vsatellite,i = < 3000, 0, 0 > m/s, and is originally rotating with an angular speed ?1 = 2 radians/second, in the direction shown in the diagram. A ...
*Sunday, April 14, 2013 by Emily*

**Physics**

A device consists of eight balls each of mass 0.4 kg attached to the ends of low-mass spokes of length 1.8 m, so the radius of rotation of the balls is 0.9 m. The device is mounted in the vertical plane. The axle is held up by supports that are not shown, and the wheel is ...
*Sunday, April 14, 2013 by Emily*

**pre ap physics**

A) A small cork with an excess charge of +9.0x10^-6 is placed 0.13 m from another cork, which carries a charge of −3.2x10^-6. What is the magnitude of the electric force between the corks? The Coulomb constant is 8.98755 × 10^9 N • m^2/C^2. Answer in units of ...
*Sunday, April 14, 2013 by keely*

**physics**

A solid block of mass m2 = 8.3 kg, at rest on a horizontal frictionless surface, is connected to a relaxed spring. The other end of the spring is fixed, and the spring constant is k = 210 N/m. Another solid block of mass m1 = 12.4 kg and speed v1 = 4.9 m/s collides with the 8....
*Sunday, April 14, 2013 by Nicole*

**physics**

A 22.0 Ω, 11.0 Ω, and 6.00 Ω resistor are connected in parallel to an emf source. A current of 6.00 A is in the 11.0 Ω resistor.What is the potential diﬀerence across the source? Answer in units of V
*Sunday, April 14, 2013 by Sara*

**physics**

An 8.0 Ω resistor and a 4.0 Ω resistor are connected in series with a battery. The potential diﬀerence across the 4.0 Ω resistor is measured as 9 V. Find the potential diﬀerence across the battery.
*Sunday, April 14, 2013 by Sara*

**Physics**

Define resistivity and state its units
*Sunday, April 14, 2013 by Tobi*

**Physics**

On an air track, a 403.0 glider moving to the right at 1.70 collides elastically with a 500.5 glider moving in the opposite direction at 3.00 . 1. Find the velocity of first glider after the collision. 2. Find the velocity of second glider after the collision.
*Sunday, April 14, 2013 by Wesley*

**physics**

'a weather station monitors a storm using a radar system. the radio wave pulse emitted is received back at the transmitter after 0.34 ms. the wavelength emitted was 5.6 cm and that received after reflection from the storm was 1 billionth of a meter longer. what information...
*Sunday, April 14, 2013 by mmk*

**physics**

An elevator has a mass of 500 kg. It may safely carry an additional mass of 1000kg and accelerate upward at 2m/s2. What is the tension in the cable?
*Sunday, April 14, 2013 by becky*

**physics**

A thin steel hoop of weight W and radius r starts from rest at A and rolls down along a circular cylindrical surface of radius a as shown in Fig. G. Determine the angle defining the position of point B where the hoop will begin to slip if the coefficient of friction at the ...
*Sunday, April 14, 2013 by praveen*

**Physics**

A coil consists of N=10^5 turns of wire wrapped uniformly around a plastic torus. The inside radius of the torus is r0=0.15 m and the outer radius is r1=0.16 m. Thus, each winding has a diameter d=0.01 m. What is the self-inductance (in H) of this coil? Work in the ...
*Sunday, April 14, 2013 by Phy*

**Physics**

Consider the following circuit. We have R_1=7 Ohms, R_2=17 Ohms, R_3=11 Ohms, V=9 Volts, L=0.09 H. At t=0 the switch is closed. (a)Immediately after the switch is closed, what are currents I_1, I_2, I_3 ? I_1 (b)What are the three currents after the switch has been closed for ...
*Sunday, April 14, 2013 by Phy*

**physics **

A 57.0 kg diver dives from a height of 15.0 m. She reaches a speed of 14.0 m/s just before entering the water. (a) What was the average force of air resistance (e.g., friction) acting on the diver. (b) What is the force of friction underwater if she reaches a depth of 2.5 m ...
*Saturday, April 13, 2013 by monica*

**physics **

A 57.0 kg diver dives from a height of 15.0 m. She reaches a speed of 14.0 m/s just before entering the water. (a) What was the average force of air resistance (e.g., friction) acting on the diver. (b) What is the force of friction underwater if she reaches a depth of 2.5 m ...
*Saturday, April 13, 2013 by monica*

**physics**

A basketball player is balancing a spinning basketball on the tip of his finger. The angular velocity of the ball slows down from 18.0 to 14.7 rad/s, during the slow down the angular displacement is 85.4 rad. Determine the time it takes for the ball to slow down.
*Saturday, April 13, 2013 by anonymous*

**physics**

A pulley of radius .10 m and having a rotational inertia of .30 kg-m^2 has a cord wrapped around it and attached to a 6.00 kg mass as shown. The pulley is free to rotate about a fixed axis through its center. The mass is allowed to fall from rest. What is the speed of the mass...
*Saturday, April 13, 2013 by Anonymous*

**physics**

A gate is free to rotate without friction about its hinges at H. The gate is initially at rest. A 4.00 kg ball of mud is thrown at 18.0 m/s towards the center of the gate and the path of the mud is perpendicular to the plane of the gate. A) Compute the magnitude of the mud'...
*Saturday, April 13, 2013 by Anonymous*

**Physics :) **

An object has a moment of Inertia of 300 kgm^2. A torque of 94 Nm is applied to the object. What is the angular acceleration of the object? Can someone please explain this to me and help me find the correct answer?! Thank you! :)
*Saturday, April 13, 2013 by Savannah*

**Physics**

1) a car moving at 50km/h crashes Into the barrier and stops in 0.25 m a) if a 10kg child were to be stopped in the same time , what is the average force must be exerted ? c)approximately what is the mass of an object whose weight equals to the force in Part b?Could you lift ...
*Saturday, April 13, 2013 by Malak*

**Physics**

The Circuit contains a resistor R1, Resistor with R2 and an inductance L in series with a battery of emf ε0=V0 . R2 having a switch in parallel, the switch S is initially closed. At t = 0, the switch S is opened, so that an additional very large resistance R2 (with R2>...
*Saturday, April 13, 2013 by tanvir ali *

**Physics**

Consider a circuit with an RL series with L=0.09 H and R=0.05 Ohm. At t=0 the circuit is connected to a battery which provides V0=12 V. (a)How long does it take to the current to equal a fraction 0.95 of the steady state current? (b) What is the energy stored (in Joules) in ...
*Saturday, April 13, 2013 by tanvir ali *

**Physics**

Consider the process of charging a parallel plate capacitor with circular plates of radius R=5 cm separated by a distance d=0.2 cm. At some time t1, the capacitor is being charged with a current I=0.04 A. Consider a point P on the plane which is equally distant from the two ...
*Saturday, April 13, 2013 by tanvir ali *

**physics**

a stone of mass 1 kg is tied to the end of a string 1m long . it is whirled in a vertical circle . if the velocity of the stone at the top be 4m/s , what is the tension in the string ?
*Saturday, April 13, 2013 by katie*

**physics**

two similar charged small spheres each having a charge of 0.044 micro coulombs are suspended from a point by a thread of length 15 cm each. at equilibrium the angle is 5 degree. what is the mass of each sphere ?
*Saturday, April 13, 2013 by Himanshi*

**physics**

Tarzan (m = 68kg) swings down from a height of 4.8m on a vine to save Jane (m = 35kg) from some hungry hippos. if he gravs jane in an inelastic collision at the bottom of the vine's path, how high will they swing up to after the collision?
*Saturday, April 13, 2013 by y*

**physics**

A 45g golf ball is hit with a golf club. the head of the club has a mass of 0.19kg and travels 63m/s before the collision. the ball has a speed of 72m/s as it leaves the face of the club. what is the speed of the club after the collision?
*Saturday, April 13, 2013 by y*

**physics**

Calculate the number of H2O molecules in a human body of mass 50.6 kg. Assume that, on average, water makes up 62% of the mass of a human body. (Use 1.0 u for the atomic mass of hydrogen, and 16.0 u for the atomic mass of oxygen.)
*Friday, April 12, 2013 by kira*

**physics**

Just wanted to say a quick thanks to Steve and Damon, figured it all out, thanks guys, awsome!!!
*Friday, April 12, 2013 by Chad*

**Physics :(( help please TT**

You are a maker of hot air balloons and wish to construct a balloon that will lift you and a friend to places unknown. Your standard balloon design is a perfectly spherical, nylon fabric balloon with a small hole on the bottom for the burner that heats the air. Nylon starts to...
*Friday, April 12, 2013 by Ian*

**physics**

A technician at the top of a 200m tall radio tower drops her hammer. how much time does it take for the hammer to strike the ground?
*Friday, April 12, 2013 by jasmine*

**PHYSICS/MATH**

What is your average power if you lift a 33.8 kg box at a constant speed to a height of 3.27 m in 6.10 s?
*Friday, April 12, 2013 by HP*

**PHYSICS/MATH**

A mass and spring are arranged on a horizontal, frictionless table. The spring constant is k = 450 N/m, and the mass is 5.4 kg. The block is pushed against the spring so that the spring is compressed an amount 0.35 m, and then it is released. Find the velocity of the mass when...
*Friday, April 12, 2013 by HP*

**physics**

What is the maximum current allowed in a 7.5 W, 300 resistor?
*Friday, April 12, 2013 by Noah*

**Physics**

A small steel sphere of mass 0.40 kg is attached by a 0.50 m long cord to a swivel pin set into the surface of a frictionless table top. The sphere moves in a circle on the horizontal surface with a speed of 6.0 m/s. a.) what is the magnitude of the centripetal acceleration of...
*Friday, April 12, 2013 by Alex*

**conceptional physics**

If a 35cm radius tire spins at a rate of 72 rad/s what is the rotating speed?
*Friday, April 12, 2013 by donnell*

**Physics multiple choice**

3. What are the units for Coeffecient of Lift? [kgm^-3] No units [Ns] [N^2] [N] [ms^-1] [kg] 4. What are the units for the ratio Lift to Drag? [Ns] [kgm^-3] No units [ms^-1] [kg] [N^2] [N]
*Friday, April 12, 2013 by John*

**physics**

A boat is traveling on a bearing of 25 degrees East of North at a speed of 4 knots (a knot is 1.852 km/h). After traveling for 3 hours, the boats heading is changed to due South and it travels for an additional 2 hours at 5 knots. Using a Vector diagram, what is the resultant...
*Friday, April 12, 2013 by Chad*

**Physics**

Consider a regular pyramid charged with constant volume charge density. The potential at point P, the top of the pyramid is 1V. What would be the potential at point P if we removed the top part, so the pyramid is instead truncated at a height h=0.6H? Hint: You don't need ...
*Friday, April 12, 2013 by Ian*

**PHYSICS! I CAN NOT GET **

A group of swimmers is resting in the sun on an off-shore raft. They estimate that 2.5 m separates a trough and an adjacent crest of surface waves on the lake. They count 15 crests that pass by the raft in 15 s. How fast are the waves moving? ____m/s (I got these answers and ...
*Friday, April 12, 2013 by Jessica*

**Physics**

During a free kick at a soccer playoff game a 0.7 kg ball at the peak of the kick 14.7 m above the field had a kinetic energy of 39.8 J. How fast was the ball booted by the player on the field?
*Friday, April 12, 2013 by Lawng*

**physics **

A bead of mass m = 40.5 kg is released from point A which is located 5 m above the ground and slides on the frictionless track as shown in the figure. Determine the beads speed when it reaches point C which is located 2.0 m above the ground.
*Friday, April 12, 2013 by robert *

**HELP Physics**

The average rate at which energy is conducted outward through the ground surface in a certain region is 30.9 mW/m2, and the average thermal conductivity of the near-surface rocks is 3.11 W/m·K. Assuming a surface temperature of 9.48°C, find the temperature (in ...
*Friday, April 12, 2013 by Shane*

**physics**

A coil consists of N=105 turns of wire wrapped uniformly around a plastic torus. The inside radius of the torus is r0=0.12 m and the outer radius is r1=0.14 m. Thus, each winding has a diameter d=0.02 m. What is the self-inductance (in H) of this coil? Work in the ...
*Friday, April 12, 2013 by dd*

**physics**

Consider a circuit with an RL series with L=0.09 H and R=0.05 Ohm. At t=0 the circuit is connected to a battery which provides V0=12 V. (a)How long does it take to the current to equal a fraction 0.95 of the steady state current? (b) What is the energy stored (in Joules) in ...
*Friday, April 12, 2013 by dd*

**physics**

Consider the process of charging a parallel plate capacitor with circular plates of radius R=5 cm separated by a distance d=0.2 cm. At some time t1, the capacitor is being charged with a current I=0.075 A. Consider a point P on the plane which is equally distant from the two ...
*Friday, April 12, 2013 by dd*

**physics**

Compare the total magnetic energy in two solenoids, each with N turns, area A, and current I, but length x and 2x. Denote Ux the total magnetic energy in the solenoid with length x, and U2x the one in the solenoid with length 2x. What is U2x/Ux?
*Friday, April 12, 2013 by dd*

**physics**

Consider the following circuit. 7.3 Ω 3.0 Ω 3.0 Ω 4.5 Ω 1.0 Ω 3.0 Ω 4.5 Ω 19.0 Ω 19.0 Ω 30 V Find the equivalent resistance. Answer in units of Ω
*Thursday, April 11, 2013 by Anonymous*

**physics**

the ﬁgure is 4.00 W. E 3.0 Ω 15.0 Ω 5.0 Ω 4.3 Ω 3.0 Ω Find the equivalent resistance of the circuit. Answer in units of Ω
*Thursday, April 11, 2013 by Anonymous*

**Physics**

An electric force of 3x10^-8N is produced from an electrostatic point charge of 4x10^-10. It is 40cm from another electrostatic point charge. What is the charge of the second point?
*Thursday, April 11, 2013 by Andrea*

**Physics**

A projectile is fired vertically from Earth's surface with an initial speed v0. Neglecting air drag, how far above the surface of Earth will it go? (Use any variable or symbol stated above along with the following as necessary: ME for the mass of the Earth, rE for the ...
*Thursday, April 11, 2013 by Rachel*

**Physics**

If an electric force of 550N is produced from two charges, one is 345C, the other is 125C. How far apart are the charges?
*Thursday, April 11, 2013 by Andrea*

**physics**

During a thunderstorm, the separation between the clouds and the earth acts as a giant capacitor with a capacitance of 2,500 µF (µ is the SI prefix for 10-6). If a tower is struck by a lightning bolt that releases 50 C of charge, how much energy is released?
*Thursday, April 11, 2013 by shirley*

**physics**

What wavelength of sound would a bat need to detect a 1cm diameter mosquito? Also, if it took 0.3 seconds for sound to return to a moth how far away would the moth be?
*Thursday, April 11, 2013 by Shelby*

**PHYSICS**

The string is 0.80 m long with tension 7.00 N. The total mass of the string is 0.012 kg. Find the wavelength of this standing wave in meters
*Thursday, April 11, 2013 by Anonymous*

**physics**

when 100 J of work is done on a stationary flywheel ( that is otherwise free to rotate in place), its angular speed increases from 60 rev/min. What is its moment of inertia?
*Thursday, April 11, 2013 by Anonymous*

**Physics**

Two boys standing on carts that move along a horizontal frictionless surface. The mass of each boy-cart combination is 100 kg, and each moves initially with the velocities of: Boy A 7cm/sec and Boy B: 10cm/sec. The boy on cart A throws a 2kg ball to the boy on Cart B (assume ...
*Thursday, April 11, 2013 by Danisha*

**physics**

A rocket cruising past earth at 0.800c shoots a bullet out the back door,opposite the rocket's motion,at 0.900c relative to the rocket. What is the bullet's speed relative to the earth?
*Thursday, April 11, 2013 by Ted*

**Physics**

4. What does the slope of each of the following graphs stand for? (y versus x) a) mass vs volume b) velocity vs time c) mass vs force d) kinetic energy vs frequency e) sine incident angle vs sine refracted angle f) charge vs voltage g) voltage vs current h) force vs area
*Thursday, April 11, 2013 by Alexis*

**physics**

A learner with a mass of 40 kg rides on a skate board with a mass of 3 kg. The resultant force on the learner and the skate board is 90 N. Calculate his acceleration.
*Thursday, April 11, 2013 by Anonymous*

**physics**

A learner with a mass of 40 kg rides on a skate board with a mass of 3 kg. The resultant force on the learner and the skate board is 90 N. Calculate his acceleration.
*Thursday, April 11, 2013 by Anonymous*

**physics**

A crate of eggs is located in the middle of the flat bed of a pickup truck as the truck negotiates a curve in the flat road. The curve may be regarded as an arc of a circle of radius 39.6 m. If the coefficient of static friction between crate and truck is 0.630, how fast can ...
*Thursday, April 11, 2013 by Tapita*

**physics**

In the figure below, a square of edge length s is formed by four spheres of masses, m1, m2, m3, and m4. What is the x-component and the y-component of the net gravitational force from them on a central sphere of mass m5. State your answers in terms of the given variables. (Use...
*Thursday, April 11, 2013 by brookel*

**Physics**

In the absence of a nearby metal object, the two inductances (LA and LB) in a heterodyne metal detector are the same, and the resonant frequencies of the two oscillator circuits have the same value of 580.0 kHz. When the search coil (inductor B) is brought near a buried metal ...
*Thursday, April 11, 2013 by Anonymous*

**Physics!! HELP**

A group of swimmers is resting in the sun on an off-shore raft. They estimate that 2.5 m separates a trough and an adjacent crest of surface waves on the lake. They count 15 crests that pass by the raft in 15 s. How fast are the waves moving? _____m/s
*Thursday, April 11, 2013 by Jessica*

**Physics**

How much work is done pushing a wheel barrow full of cement 5.3m forward if a force of 500N is applied 20 degrees from the vertical?
*Thursday, April 11, 2013 by Ted*

**Physics Electric Force**

Particle A of charge 2.76 10-4 C is at the origin, particle B of charge -6.54 10-4 C is at (4.00 m, 0), and particle C of charge 1.02 10-4 C is at (0, 3.00 m). We wish to find the net electric force on C. (a) What is the x component of the electric force exerted by A on C? (b...
*Thursday, April 11, 2013 by Alex*

**Physics**

Particle A of charge 2.76 10-4 C is at the origin, particle B of charge -6.54 10-4 C is at (4.00 m, 0), and particle C of charge 1.02 10-4 C is at (0, 3.00 m). We wish to find the net electric force on C.
*Thursday, April 11, 2013 by Alex*

**physics**

A boat is traveling on a bearing of 25 degrees East of North at a speed of 4 knots (a knot is 1.852 km/h). After traveling for 3 hours, the boats heading is changed to due South and it travels for an additional 2 hours at 5 knots. Using a Vector diagram, what is the resultant...
*Thursday, April 11, 2013 by Chad*

**physics**

Two cylindrical conductors with equal cross sections but different resistivities are put end-to-end. Find the magnitude of the charge that accumulates at the boundary between the conductors if a current I=100A flows in the wires. The wires are made of aluminum and copper with ...
*Thursday, April 11, 2013 by Sahil*

**physics**

Your written homework will be graded entirely on the clarity and completeness of your derivation. No credit will be awarded for a final answer without a derivation. As usual, simplify your final answers as much as possible. A giant Pez dispenser of mass m rests on a ladder of ...
*Thursday, April 11, 2013 by Nick*