Thursday

April 17, 2014

April 17, 2014

Number of results: 214,084

**help**

from which equations is the following equation derived from: length=(time^2 * g)/4
*Wednesday, April 4, 2012 at 8:09pm by physics*

**Help!!**

An air-filled capacitor consists of two parallel plates, each with an area of 7.60 cm2, separated by a distance of 1.70 mm. (a) If a 16.0 V potential difference is applied to these plates, calculate the electric field between the plates. kV/m (b) What is the surface charge ...
*Thursday, October 17, 2013 at 11:53pm by physics*

**phys need help**

I typed in the answer for the direction (85 and 175) and they are both wrong according to the problem. I want to try 4.8 degrees since it says east of south, but I don't know though.
*Tuesday, September 15, 2009 at 4:18am by physics*

**PHYSICS PLEASE HELP**

A fire hose held near the ground shoots water at a speed of 6.5 m/s 1. At what angle(s) should the nozzle point in order that the water land 2.5 m away? -I believe the answer is 18,72 2. Sketch the trajectory for the 18; angle -Please give me exact (x,y coordinates) -I believe...
*Sunday, January 26, 2014 at 1:05am by PHYSICS*

**Kristen**

Thank you for your help!
*Wednesday, October 27, 2010 at 3:11pm by Physics*

**physics**

please help: A repelling force occurs between two charged objects when the charges are of a. unlike signs b. like signs c. equal magnitude d. unequal magnitude
*Thursday, March 12, 2009 at 11:09am by physics*

**KC**

I have an assignment to discuss what scientists are doing to reduce the g forces on astronauts and to come up with a g force problem of my own. Can you help?
*Friday, March 13, 2009 at 4:00pm by Physics*

**Algebra**

I took algebra two and there not really verticle asymptotes threr limits you have been lied to which you should be used to if you are going to a public high school All I remeber is you try to get them to cancel out and get removable discontinuties or something this was a long ...
*Tuesday, July 14, 2009 at 4:45pm by physics*

**Physics**

A diesel engine takes in 0.5 moles of air at 20.0C and at atmospheric pressure. It then compresses it adiabatically to one twentieth of its original volume. which means n = 0.5 T = 20 and Vfinal = V1/20 but where do I go from here? can anyone help?
*Tuesday, August 3, 2010 at 1:56pm by Physics*

**sara**

In a constant-volume process, 211 J of energy is transferred by heat to 1.05 mol of an ideal monatomic gas initially at 303 K. (a) Find the increase in internal energy of the gas. J (b) Find the work done on it. J (c) Find its final temperature. K i am having trouble with this...
*Tuesday, October 21, 2008 at 5:03pm by physics*

**sara**

In a constant-volume process, 211 J of energy is transferred by heat to 1.05 mol of an ideal monatomic gas initially at 303 K. (a) Find the increase in internal energy of the gas. J (b) Find the work done on it. J (c) Find its final temperature. K i am having trouble with this...
*Tuesday, October 21, 2008 at 5:14pm by physics*

**physics**

I need help with solving these word problems. Marion rides her racing bicycle @ speed of 8 m/s. Bicycle wheels have a radius of 34 cm. What is the angular speed of wheels? How many times does each wheel go around during a 10-min race? A car tire has radius of 33cm. Tire turns ...
*Monday, December 1, 2008 at 8:21pm by physics*

**Physics**

I need help with solving these word problems. Marion rides her racing bicycle @ speed of 8 m/s. Bicycle wheels have a radius of 34 cm. What is the angular speed of wheels? How many times does each wheel go around during a 10-min race? A car tire has radius of 33cm. Tire turns...
*Monday, December 1, 2008 at 8:59pm by physics*

**physics**

pleaase help me with this, i'm very bad in physics, and i mostly don't understand any of this stuff...can anyone explain as well as show me how to do this Monochromatic light from a helium-neon laser (wavelength=632.8 nm) shines at a right angle onto the surface of a ...
*Thursday, March 12, 2009 at 4:59pm by physics*

**physics**

thanks for the help earlier just got a question I'm taking AP Physics B this year does that mean next year I would Take AP Physics C??? I don't know if the material in C convers the same material plus the additional calculus material or what??? Could I take AP Calculus while ...
*Sunday, August 9, 2009 at 9:12pm by physics*

**Melanie**

A right triangle has a hypotenuse of length 13 meters and one side of length 5 meters. What is the length of the third side and the angle between the hypotenuse and the 5 meter side? A. 144 meters, 67.38 degrees B. 12 meters, 22.62 degrees C. 10 meters, 22.62 degrees D. 12 ...
*Saturday, January 19, 2013 at 2:22pm by Physics*

**Physics**

I need some help getting a formula. I remember in class u get this really wierd looking equation like Vicosg-((vsin(pheta))/2g) I think this is what the equatin is when I'm asked to "Derive a formula for the Range of a projectile based on Vi and the Launch angle, pheta. State ...
*Monday, December 8, 2008 at 8:10pm by Physics*

**physics**

I need some help getting a formula. I remember in class u get this really wierd looking equation like Vicosg-((vsin(pheta))/2g) I think this is what the equatin is when I'm asked to "Derive a formula for the Range of a projectile based on Vi and the Launch angle, pheta. State ...
*Monday, December 8, 2008 at 10:42pm by Physics*

**Physics need work checked**

Physics lenses. Please help, my math is wrong and I need second opinion.? Consider three lenses with focal lengths of 25.9 cm, -15.8 cm, and 10.0 cm positioned on the x axis at x1 = 0 m, x2 = 0.412 m, and x3 = 0.514 m, respectively. An object is at d = -121 cm. Find the ...
*Wednesday, May 2, 2012 at 2:00am by Physics*

**micole**

White light strikes a diffraction grating (930 lines/mm) at normal incidence. What is the longest wavelength that forms a second-order maximum? I used the equation [(1/d)sin(90)]/m = wavelength: [(1/0.93m)(1)] /2 = 0.5376m. To convert to nm I multiplied by 10^-9. This is ...
*Sunday, August 19, 2007 at 8:00pm by PHYSICS*

**Phyiscs**

A lbock is given an intial speed of 4.0 s^-1 m up the 22 degree plane How far up the plane will it go ok I got this to be something like 2.2 about i understand this i need help on this how much time elapses before it returns to tis starting point? Ignore friction. ok I need to...
*Saturday, July 11, 2009 at 7:39pm by Physics*

**Physics**

Ok the problem I'm doing has two parts I know how to do part a and got the right answer I think... I do not know how to do part b Here's the problem A student driver wants to make his car jump over 8 cars parked side by side below a horizontal ramp (a)With what minimum speed ...
*Sunday, July 5, 2009 at 10:09pm by Physics*

**Physics**

ok so I have a question At the instatn a race began, a 57-kg sprinter was found to exert a force of 80 N on the starting lbock at 22 degrees with respect to the ground what was the horizontal acceleration of the sprinter? I got roughly 1.3 s^-2 m ok here's were i need some ...
*Friday, July 10, 2009 at 8:43pm by Physics*

**Physics**

I've asked a similar qustion earlier and now I think I have drawn the correct free body diagram and go about solving the problem. The only thing is I do not know how to solve it. a block (mass m1) on a smooth horizontal surface, connected by a thin cord that passes over a ...
*Tuesday, July 14, 2009 at 1:26pm by Physics*

**Physics (Please)**

I'm confused and am hoping someone could help me understand energy can neither be created nor destroyed... great... so in physics classes we can set up problems and stuff were KEo + PEo = KE + PE Energy intial equals energy final sense energy is conserved but then when ...
*Monday, October 19, 2009 at 8:29pm by Physics*

**Physics**

Ok I asked this question before A lbock is given an intial speed of 4.0 s^-1 m up the 22 degree plane How far up the plane will it go ok I got this to be something like 2.2 about i understand this i need help on this how much time elapses before it returns to tis starting ...
*Saturday, July 11, 2009 at 9:20pm by Physics*

**physics**

sigh this is killing me here... ok rockets launch at 250 m/s @ an angle of 75.0 degrees. There's a mountain 2500m away from launch point that is 1800m high. There's a boat 610 m from the island. So i'm suppose to find out how much it'll clear the moutain and close it'll come ...
*Wednesday, January 14, 2009 at 10:23pm by physics*

**Physics**

sigh this is killing me here... ok rockets launch at 250 m/s @ an angle of 75.0 degrees. There's a mountain 2500m away from launch point that is 1800m high. There's a boat 610 m from the island. So i'm suppose to find out how much it'll clear the moutain and close it'll come ...
*Wednesday, January 14, 2009 at 10:51pm by physics*

**physics**

please check these for me: When a positive charge moves in the direction of the electric field, what happens to the electrical potential energy associated with the charge? a. it increases b. it decreases c. it remains the same d. it sharply increases, and then decreases C A ...
*Thursday, March 12, 2009 at 7:09pm by physics*

**Physics**

def of average velocity = t^-1 (x - x0) (average velocity = t^-1(x-x0))t=(avearge velocity)t + x0= x - x0 + x0 = x = (average velocity)t + x0 x = (average velocity)t + x0 def of average velocity were costant acceleration is assumed = 2^-1(v0 + v) plug into x = (average ...
*Thursday, June 18, 2009 at 9:40pm by Physics*

**Physics**

def of average velocity = t^-1 (x - x0) (average velocity = t^-1(x-x0))t=(avearge velocity)t + x0= x - x0 + x0 = x = (average velocity)t + x0 x = (average velocity)t + x0 def of average velocity were costant acceleration is assumed = 2^-1(v0 + v) plug into x = (average ...
*Friday, June 19, 2009 at 8:23am by Physics*

**Physics**

When I asked my teacher for help he told me this This is a logical puzzle. Having 75% of the typical weight means experiencing 75% of the typical gravity. The floor must be falling away with an acceleration of 25% of typical gravity. Here's the question I asked that's from my ...
*Friday, July 10, 2009 at 12:29pm by Physics*

**physics**

a block (mass m1) on a smooth horizontal surface, connected by a thin cord that passes over a pulley to as second block (m2), which hangs vertically. Ignore friction and the masses of the pulley and cord. If m1 = 13.0 kg and m2 = 6.0 kg determine the accleeration of each block...
*Tuesday, July 14, 2009 at 7:23pm by physics*

**Physics**

I agree with this and see were it comes from net force = (delta p)/t so momentum is conserved when net force equals zero... net force = (delta p)/t 0 = (delta p)/t however the following is not true 0 = (delta p)/t = P - Po were p is momentum and Po is used to indicate inital ...
*Saturday, October 3, 2009 at 12:25pm by Physics*

**Physics**

Hello recently I was asked to find the time it takes a satalite that is geocentric (that always stays above the same exact spot of the earth) so... I was given the radius of 61 earth radius or simply 3.89 E 6 m mass of earth what G equals and have to use Newtons law of ...
*Thursday, May 7, 2009 at 9:01pm by Physics*

**Susane**

Two identical traveling waves moving in the same direction are out of phase by pi/2 rad. What is the amplitude Y of the two combining waves. I have no clue how to do this. The answer according to the back of the book is 1.4y max. If you could explain to me how they got that ...
*Tuesday, February 6, 2007 at 9:52pm by Physics help*

**PHYSICS HELP**

a cube of wood with a density of 0.78g/cm^3 is 10cm on a side. When placed in the water what height will the block float above the surface? what am i doing wrong here: height= Desity of cube* volume of cube and devide by the density of water * area of the cube H= (0.78g/cm^3 *...
*Tuesday, November 13, 2007 at 10:59pm by PHYSICS HELP*

**PHYSICS HELP**

A disk has a moment of inertia of 3.0x10^-4 and rotates with an angular speed of 3.5 rad/sec. WHat net torque must be applied to bring it to rest in 3.0s? can some one help me out with this im lost!!!
*Tuesday, November 13, 2007 at 11:18pm by PHYSICS HELP*

**annie**

You want to get an idea of the magnitude of magnetic fields produced by overhead power lines. You estimate that a transmission wire is about 11m above the ground. The local power company tells you that the line operates at 13kV and provide a maximum of 86MW to the local area. ...
*Monday, December 14, 2009 at 4:41pm by physics help*

**HELP dielectric**

Energy of a Capacitor in the Presence of a Dielectric A dielectric-filled parallel-plate capacitor has plate area A = 30.0 cm^2, plate separation d = 10.0 mm and dielectric constant k = 5.00. The capacitor is connected to a battery that creates a constant voltage V = 7.50 V. ...
*Monday, December 14, 2009 at 4:47pm by physics help*

**physicsss**

Phobos is the larger and closer of Marsâ€™s two moons. It has no atmosphere, a mean radius of 11 km, an albedo of 0.07, and an emissivity of 1.0. (i) Assuming that the radiative temperature of Phobos is 222 K and that it is spherical, what is its mean distance from the sun? (ii...
*Sunday, January 24, 2010 at 4:50pm by physics help!*

**physicsss**

sorry but i dont understand wat is R^2 wat does that represent? and wat is Hsun?
*Sunday, January 24, 2010 at 4:50pm by physics help!*

**PHYSICS**

Phobos is the larger and closer of Marsâ€™s two moons. It has no atmosphere, a mean radius of 11 km, an albedo of 0.07, and an emissivity of 1.0. (i) Assuming that the radiative temperature of Phobos is 222 K and that it is spherical, what is its mean distance from the sun? (ii...
*Sunday, January 24, 2010 at 6:17pm by physics help!*

**physics**

a pair of glasses is dropped from the top of a 36.0 m high stadium. a pen is dropped from the same position 2.21 seconds later. how high above the ground is the pend when the glasses hit the ground? (disregard air resistence. a=-g=-9.81 meters per second squared)
*Thursday, November 11, 2010 at 10:39pm by PHYSICS HELP*

**physics**

what is the formula for momentum?
*Sunday, January 16, 2011 at 7:27pm by physics help*

**physics**

A tennis ball of 60g is dropped from a height of 2.0m,It rebounds but loses 25% of its kintic energy as thermal energy.Ignoring air resistance,calculate
*Wednesday, April 6, 2011 at 7:06am by Physics,help.*

**physics**

A tennis ball of 60g is dropped from a height of 2.0m,It rebounds but loses 25% of its kintic energy as thermal energy.Ignoring air resistance,calculate (1)the kinetic energy of the tennis ball when hits the ground. (2)the height reached on the ground
*Wednesday, April 6, 2011 at 7:09am by Physics,help.*

**PHYSICS**

A flywheel in the form of a heavy circular disk of diameter 0.83 m and mass 111 kg is mounted on a frictionless bearing. A motor connected to the flywheel accelerates it from rest to 1430 rev/min. a)What is the moment of inertia of the fly- wheel? Answer in units of kg · m2 b...
*Friday, October 21, 2011 at 11:37pm by PHYSICS HELP!!!!!!!!!!!!!!!!*

**physics**

A weight (with a mass of 71 kg) is suspended from a point near the right-hand end of a uniform boom with a mass of 51 kg . To support the uniform boom a cable runs from this same point to a wall (the left-hand vertical coordinate y=7 x=6) and by a pivot on the same wall at an ...
*Monday, November 7, 2011 at 8:39pm by PHYSICS HELP!!!!*

**physics**

A uniform 7.1 m tall aluminum ladder is leaning against a frictionless vertical wall. The ladder has a weight of 272 N. The ladder slips when it makes a 57.0degrees angle with the horizontal floor. Determine the coefficient of static friction between the ladder and the floor.
*Monday, November 7, 2011 at 9:29pm by PHYSICS HELP!!!!*

**Physics**

An organ pipe that is closed at one end has a fundamental frequency of 122 Hz. There is a leak in the church roof, and some water gets into the bottom of the pipe, as shown in the Figure. The organist then finds that this organ pipe has a frequency of 300 Hz. What is the depth...
*Sunday, November 20, 2011 at 10:13pm by Physics Help!*

**physics**

a transformer has 200 turns in its primary coil, the potential difference across the transformer is 220V needs to operate an electrical instrument uses a 110 volts. the number of turns in its secondary coil is: a) 100 turns b) 200 turns c) 110 turns d) 220 turns
*Saturday, August 25, 2012 at 1:37am by help physics*

**physics**

A ski jumper starts from rest 44.0 m above the ground on a frictionless track, and flies off the track at an angle of 45.0° above the horizontal and at a height of 14.0 m from the ground. Neglect air resistance. (a) What is his speed when he leaves the track? m/s (b) What is ...
*Thursday, November 8, 2012 at 9:19pm by physics help!!*

**physics**

calculate the current in the secondary coil when the current in the primary coil is 0.50 A. there are 200 turns in the primary coil and 3000 turns on the secondary. the input voltage is 55 v
*Wednesday, March 6, 2013 at 3:54pm by physics help?*

**physics**

how?
*Tuesday, April 30, 2013 at 5:16am by Physics help*

**physics**

how
*Tuesday, April 30, 2013 at 5:15am by Physics help*

**physics(help)**

We are standing at a distance d=15 m away from a house. The house wall is h=6 m high and the roof has an inclination angle β=30 ∘. We throw a stone with initial speed v0=20 m/s at an angle α= 35 ∘. The gravitational acceleration is g=10 m/s2. (See figure...
*Sunday, October 6, 2013 at 4:41pm by physics(help)*

**physics**

Over a certain region of space, the electric potential is V = 5x - 6x2y + 2yz2. Find the expression for the x component of the electric field over this region. (Use x, y, and z as necessary.) Find the expression for the y component of the electric field over this region. Find ...
*Sunday, October 13, 2013 at 4:04pm by physics help *

**Ap Physics 1**

The 1800 kg tractor exerts a force of 1.75 104 N backward on the pavement, and the system experiences forces resisting motion that total 2400 N. If the acceleration is 0.210 m/s2, what is the mass of the airplane? (b) Calculate the force exerted by the tractor on the airplane...
*Tuesday, December 10, 2013 at 9:37am by Physics Help!*

**Ap Physics 1**

The 1800 kg tractor exerts a force of 17500N backward on the pavement, and the system experiences forces resisting motion that total 2400 N. If the acceleration is 0.210 m/s2, what is the mass of the airplane? (b) Calculate the force exerted by the tractor on the airplane, ...
*Tuesday, December 10, 2013 at 9:53am by Physics Help!*

**physics**

On a calm, bright day, you're scuba diving in a deep lake (n = 1.33), 6.30 m away from your sailboat in the horizontal direction. When you are 2.70 m below the surface, the top of the sailboat mast appears to you to be in a direction 31.0° from vertical. Calculate the height ...
*Monday, February 3, 2014 at 11:30am by physics help*

**physics please help **

One lump of clay traveling at 14.98 m/s overtakes a second lump traveling at 4.98 m/s. After collision they are stuck together. To the nearest tenth of a m/s what is their common velocity? -------------------------------------------------------------------------------- 4 If ...
*Wednesday, May 22, 2013 at 9:51pm by blah physics*

**Physics**

Someone has already posted this question, but their's was never answered, so hopefully someone can answer this. Thanks. An interference pattern is set up by two point sources of the same frequency, vibrating in phase with one another. A point on the second nodal line is 50.0 ...
*Saturday, December 15, 2007 at 12:40pm by Needs Physics help desperately*

**Physics Questions!**

mmmh are you sure it is 9 cm? It is destructive interference which means a minimum, therefore PmS1-PmS2= (m+1/2) lambda...I get 9 cm when I don't account for the m + 1/2
*Saturday, December 15, 2007 at 12:11pm by Needs Physics help desperately*

**Physics Questions!**

Thanks for all of your help, I talked to my other friend who had originally posted, and we both appreciate this, thanks!
*Saturday, December 15, 2007 at 12:11pm by Needs Physics help desperately*

**Physics**

Thanks for the help!
*Saturday, December 15, 2007 at 12:40pm by Needs Physics help desperately*

**physics**

A plane flying horizontally above Earthâ€™s surface at 150. meters per second drops a crate. The crate strikes the ground 30.0 seconds later. What is the magnitude of the horizontal component of the crateâ€™s velocity just before it strikes the ground? I know the answer is 150 m/s...
*Thursday, November 12, 2009 at 9:12pm by Physics Student need help*

**physics**

10. A cannon elevated at an angle of 35º to the horizontal fires a cannonball, which travels the path shown in the diagram below. [Neglect air resistance and assume the ball lands at the same height above the ground from which it was launched.] If the ball lands 7.0 × 10² ...
*Thursday, November 12, 2009 at 9:12pm by Physics Student need help*

**physics**

oops but that's another question
*Thursday, November 12, 2009 at 9:12pm by Physics Student need help*

**physics**

10. A cannon elevated at an angle of 35º to the horizontal fires a cannonball, which travels the path shown in the diagram below. [Neglect air resistance and assume the ball lands at the same height above the ground from which it was launched.] If the ball lands 7.0 × 10² ...
*Thursday, November 12, 2009 at 9:13pm by Physics Student need help*

**College physics**

A 3.5-A current is maintained in a simple circuit with a total resistance of 1500 W. What net charge passes through any point in the circuit during a thirty second interval?
*Monday, March 29, 2010 at 6:55pm by HELP WITH PHYSICS*

**physics**

a shopper in a supermarket pushes a cart with a force of 35 n directed at an angle of 25 downward from the horizontal. the force is just sufficient to over come the various frictional force, so the cart moves at constant speed. what is the net work dont on the cart? why? the ...
*Thursday, September 23, 2010 at 11:07pm by physics help please!!!*

**physics**

I did a lab experiment where we verify Newtons second law experimentally. A glider moves along a frictionless air track and is attached to a hanging mass. We vary the hanging masses and calculate the force since we have the mass and acceleration. We have some questions to ...
*Monday, October 11, 2010 at 4:34pm by physics lab help*

**physics**

IS it true that if the acceleration increases then the graph would have a steeper slope but if the acceleration decreased then the slope would flatten out.
*Monday, October 11, 2010 at 4:34pm by physics lab help*

**Physics**

A whale swims due east for a distance of 7.299x10^1 km, turns around and goes due west for 3.58x10^0 km, and finally turns around again and heads 2.64x10^1 km due east. What is the displacement (referenced to the East) of the whale, to 2 significant figures?
*Wednesday, October 13, 2010 at 11:42pm by PHYSICS HELP PLS*

**Physics**

An object with a mass of 2.489x10^1 kg is subjected to a force of 4.8124x10^2 N directed at an angle of 2.819x10^1 degrees from the x axis. A second force of 2.84529x10^3 N acting in the negative X directions is also applied to the object. To two significant figures what is ...
*Friday, October 22, 2010 at 4:34pm by PHYSICS HELP PLS*

**Physics**

A garden hose with a diameter of 0.65 has water flowing in it with a speed of 0.91 and a pressure of 1.2 atmospheres. At the end of the hose is a nozzle with a diameter of 0.29. Find the speed of water in the nozzle? Find the pressure in the nozzle.
*Sunday, April 24, 2011 at 11:19pm by URGENT PHYSICS HELP!*

**PHYSICS**

2.6 kg mass initial velocity of v1 =aË†i, where a = 5.95 m/s collides with and sticks to a 1.59 kg mass with an initial velocity of v1 = bË†j, where b = −4.8 m/s. Find the final speed of the composite mass. Answer in units of m/s
*Friday, October 21, 2011 at 11:34pm by PLEASE PHYSICS HELP*

**Physics**

A 1200 kg car pushes a 2100 kg truck that has a dead battery to the right. When the driver steps on the accelerator, the drive wheels of the car push against the ground with a force of 4500 N . What is the magnitude of the force the car applies to the truck? What is the ...
*Tuesday, November 1, 2011 at 12:15am by Help Physics college*

**Physics Intro **

A roller coaster has a vertical drop of height 66 m and then is followed by a oop. It starts as a steep slope 75 degrees to the horizontal and then enters into a circular path of radius R. In order to stay below 4 tims the force of gravity at the bottom of the bend, what is ...
*Monday, November 12, 2012 at 8:47pm by Physics Help Please*

**physics**

A tank holds 2.85 L of oxygen at 22.1 Celsius and 235 atm. (A) how many moles of gas does the tank contain? (B) what is the average kinetic energy per molecule ?
*Monday, December 31, 2012 at 9:11pm by Physics student need help*

**physics**

but the answer in the text book is (a) 27.7 moles (b) 2.381x10^7pa i just want the formula so i can attempt the problem myself
*Monday, December 31, 2012 at 9:11pm by physics student need help *

**physics student **

A tank holds 2.85 L of oxygen at 22.1 Celsius and 235 atm. (A) how many moles of gas does the tank contain? (B) what is the average kinetic energy per molecule ? the answer in the text book is (a) 27.7 moles (b) 2.381x10^7pa i just want the formula so i can attempt the problem...
*Tuesday, January 1, 2013 at 7:07pm by physics student need help *

**PHYSICS**

An air-filled capacitor consists of two parallel plates, each with an area of 7.60 cm2, separated by a distance of 1.70 mm. (a) If a 16.0 V potential difference is applied to these plates, calculate the electric field between the plates. kV/m (b) What is the surface charge ...
*Sunday, October 20, 2013 at 10:39pm by HELP in physics!!!*

**PHYSICS**

A five turn square loop (10 cm on an edge and resistance = 4.0 ohms) is placed in a magnetic field that makes an angle of 30 degrees with the plane of the loop. The magnitude of this field varies with the time according to B = 0.50 t^2, where t is measured in seconds and B in ...
*Monday, November 11, 2013 at 8:49pm by HELP in physics!!!*

**Physics**

A projectile (mass = 0.17 kg) is fired at and embeds itself in a target (mass = 2.84 kg). The target (with the projectile in it) flies off after being struck. What percentage of the projectile's incident kinetic energy does the target (with the projectile in it) carry off ...
*Tuesday, January 22, 2013 at 8:34pm by Help*

**PHYSICS**

you need to move a 500 kg crate of gazelle food from the garage along the 42 meter hall to the kitchen. If you apply a force of 1000 N at a 37 degree angle to the horizontal. How long will it take to move to the kitchen?(coefficient of static friction=.15, coefficient of ...
*Wednesday, September 26, 2007 at 7:01pm by HELP!!!*

**Physics**

HOw many electrons make up a charge of -30 micro coulombs???
*Monday, January 7, 2008 at 6:04pm by HELP!!!!*

**physics**

When a hot object is placed in contact with a cooler object, the hot object warms the cooler one. Can you say it loses as much temperature as the cooler one gains? Defend your answer.
*Wednesday, January 30, 2008 at 7:00pm by HELP!*

**physics**

You can comfortably hold your fingers close beside a candle flame, but not very close above the flame. Why? In a still room, smoke from a candle will sometimes rise only so far, not reaching the ceiling. Explain why.
*Wednesday, January 30, 2008 at 7:35pm by HELP!*

**Physics**

Two blocks, with masses M1 = 1.4 kg and M2 = 9.9 kg, and a spring with spring constant k = 228 N/m are arranged on a horizontal, frictionless surface. The coefficient of static friction between the two blocks is 0.59. What is the maximum possible amplitude of the simple ...
*Sunday, April 27, 2008 at 3:35pm by help?*

**physics**

A 85.0 kg person steps into a car of mass 2500.0 kg, causing it to sink 2.5 cm. Assuming no damping, with what frequency will the car and passenger vibrate on the springs?
*Monday, April 28, 2008 at 3:22pm by help?*

**physics**

At 08:00hrs a 2.0- m-long vertical stick in air casts a shadow 1.8 m long. If the same stick is placed at 08:00hrs in air in a flat bottomed pool of salt water half the height of the stick, how long is the shadow on the floor of the pool? (For this pool, n = 1.56.)
*Saturday, May 24, 2008 at 12:52pm by help?*

**physics**

A laser beam enters a .125 m thick glass window at an angle of 39° (from the normal). The index of refraction of the glass is 1.46. At what angle from the normal does the beam travel through the glass? that answer is 25.53 deg the second part asks How long does it take the ...
*Saturday, May 24, 2008 at 1:03pm by help?*

**physics**

By what length is a light ray displaced after passing through a 4.7 cm thick sheet of material (n=1.38) with an incident angle of theta = 33.5°.
*Saturday, May 24, 2008 at 1:05pm by help?*

**physics**

An object whose height is 3.5 cm is at a distance of 8.5 cm from a spherical concave mirror. Its image is real and has a height of 11.2 cm. Calculate the radius of curvature of the mirror. How far from the mirror is it necessary to place the above object in order to have a ...
*Saturday, May 24, 2008 at 1:13pm by help?*

**physics**

they're true false that's all the info given
*Saturday, May 24, 2008 at 1:14pm by help?*

**physics**

TRUE OR FALSE The virtual image formed by a convex mirror is always enlarged. A convex mirror never forms a real image of a real object. When the object of a concave mirror is inside the focal point, the image is virtual. The image produced by a convex mirror is always closer ...
*Saturday, May 24, 2008 at 1:14pm by help?*

**physics**

no it's cool i finally think i got it. False True True True False True False
*Saturday, May 24, 2008 at 1:14pm by help?*

**physics**

A dime .334 m away from, and on the optical axis of, a concave spherical mirror produces an image on the same side of the mirror as the source. The image is .093 m away from the mirror. If the dime is moved on the axis to .229 m from the mirror, how far away from the mirror is...
*Sunday, May 25, 2008 at 12:52pm by help?*

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