Friday

April 18, 2014

April 18, 2014

Number of results: 144

**Phsyics**

how did you get 1.3?
*Sunday, September 19, 2010 at 7:26pm by Rosemendz*

**phsyics**

hi
*Sunday, October 24, 2010 at 5:08pm by Anonymous*

**Phsyics**

I did not get the answer...
*Tuesday, December 18, 2012 at 7:59pm by g*

**phsyics**

who am i
*Monday, March 27, 2006 at 6:25pm by raihanna*

**Phsyics**

Thank you so much!
*Thursday, May 5, 2011 at 1:33am by Anonymous*

**phsyics**

njhbhj
*Friday, March 9, 2012 at 1:58pm by Anonymous*

**phsyics**

E * d = V 1.2*10^3 * .03 = V
*Thursday, January 12, 2012 at 9:33pm by Damon*

**Phsyics**

Can you explain to me how an LCD works?
*Saturday, May 1, 2010 at 8:10pm by Emily*

**Phsyics**

see other post.
*Tuesday, October 26, 2010 at 6:48pm by bobpursley*

**Phsyics**

see other post.
*Tuesday, October 26, 2010 at 6:47pm by bobpursley*

**Phsyics**

the end velocity is 4m/s
*Friday, December 17, 2010 at 8:58pm by Lisa*

**phsyics**

a = F/m = 3476 / 975 = 3.57 m/s^2.
*Thursday, December 15, 2011 at 3:57pm by Henry*

**phsyics**

What is the significance of the sign of the velocity (whether is + or -)?
*Friday, September 18, 2009 at 9:52pm by Mya*

**phsyics**

See your 11-1,7:04pm post.
*Tuesday, November 1, 2011 at 7:15pm by Henry*

**phsyics**

d = V*t. t = d/V = 0.60m/476 = 1.26*10^-3 s.
*Friday, March 9, 2012 at 1:58pm by Henry*

**Phsyics**

M*g*H = 75*9.8*30 = ___ joules
*Thursday, May 24, 2012 at 10:43am by drwls*

**IPC(integrated phsyics)**

R-value is a common method.
*Monday, November 29, 2010 at 6:08pm by bobpursley*

**pre ap phsyics**

Sorry for sounding rude thank you for the help.
*Tuesday, January 4, 2011 at 2:45am by carly*

**phsyics**

Vf^2=Vi^2+2ad solve for d. a=-2.4m/s^2
*Thursday, July 5, 2012 at 2:09pm by bobpursley*

**Basic Phsyics**

Now we have done a lot of these. You try.
*Tuesday, December 18, 2012 at 3:23pm by Damon*

**PHSYICS**

well,the sound traveled 2*685m totaldistance= velocitysound*timetotal
*Sunday, November 7, 2010 at 7:38pm by bobpursley*

**PHSYICS!**

I solved it and I'm pretty sure it comes around 5.7168.
*Thursday, October 31, 2013 at 3:38pm by Danny*

**Phsyics**

This cannot be determined, without knowing more...such as the end velocity.
*Friday, December 17, 2010 at 8:58pm by bobpursley*

**Phsyics**

well, only one answer is true. Have you studied capacitors yet?
*Friday, February 5, 2010 at 7:00pm by bobpursley*

**Phsyics**

I would go with 5, but that is very misleading. How one does that is tricky, you do it by measuring absorbtion of light.
*Wednesday, November 13, 2013 at 9:23pm by bobpursley*

**phsyics**

thank you so much. i was struggling through this problem for so long. but now everything makes perfect sense! =D
*Thursday, November 6, 2008 at 5:34pm by joyce*

**phsyics**

d = 1.8km * 1000m/km = 1800m. W = Fd = 470 * 1800 = 846,000 Joules.
*Tuesday, November 1, 2011 at 7:04pm by Henry*

**Phsyics**

net force=totalmass*acceleration tension=(63+815)*a solve for a. Now, scalereads= massher*(g+a)
*Thursday, September 27, 2012 at 8:58pm by bobpursley*

**Tom**

A football is kicked at 15 m/s with an angle of 35 degrees with the ground. How long is it in the air? How far will it land? Can someone help plz... Thanks!
*Monday, December 3, 2007 at 7:00pm by Phsyics*

**PHSYICS 12 HELP PLEASE!**

Determine the specific gravity of a fish which masses 320g in air and has an apparent mass of 21g in water
*Sunday, June 3, 2012 at 8:57pm by VIJ*

**PHSYICS HELP PLZZZZ**

A football is kicked at 15 m/s with an angle of 35 degrees with the ground. How long is it in the air? How far will it land? Can someone help plz... Thanks!
*Monday, December 3, 2007 at 8:26pm by Dan*

**phsyics**

hi, has anyone done the lab on 1.2 lab : constant velocity? it's about ticker tape. thanks
*Wednesday, March 11, 2009 at 6:26pm by ashley*

**Phsyics**

Vf^2=Vi^2+2ad but a= Force/mass solve for force.
*Tuesday, October 26, 2010 at 6:48pm by bobpursley*

**phsyics**

centripetal acceleration= w^2 r change rev/sec to rad/sec
*Monday, November 1, 2010 at 7:26pm by bobpursley*

**Phsyics**

a. F = (m1+m2)g, F = (40.6+69.1)*9.8 = 1075N. b. F = -1075N.
*Monday, November 28, 2011 at 1:03pm by Henry*

**phsyics**

The sign determines the direction of the velocity with respect to the positive direction of the coordinate system.
*Friday, September 18, 2009 at 9:52pm by drwls*

**college phsyics**

Work = Force exerted times distance in the direction of the force. a) 2.4*1.5 J b) -.6*1.5 J c) difference
*Friday, February 12, 2010 at 7:18am by Damon*

**Phsyics**

1) set v^2/r=G*mass/r^2 where r is radius asteroid + altitude. solve for v 2) 1/2 vescape^2=GMaste/radius
*Tuesday, April 13, 2010 at 3:16pm by bobpursley*

**phsyics**

a. Circumference = pi*2r = 3.14*2r = 6.28r V = C/t = 2pi*r/t b. V = 6.28*100m/14s = 45 m/s.
*Wednesday, March 19, 2014 at 1:18pm by Henry *

**IPC(integrated phsyics)**

Insulating materials are rated by their _____. specific heat heat index R-value temperature resistance
*Monday, November 29, 2010 at 6:08pm by lana*

**phsyics**

A wheel has a radius of 6.6 m. How far (path length) does a point on the circumference travel if the wheel is rotated through an angle of 52.0°?
*Sunday, November 4, 2012 at 2:05pm by Anonymous*

**Phsyics**

Determine the absolute pressure at the bottom of a lake that is 66.1 m deep. Write your answer correct to two decimal paces let Patm = 101,300 Pa
*Thursday, March 13, 2014 at 2:54pm by Paul*

**Phsyics**

Two objects attract each other gravitationally with a force of 2.1×10−10 when they are 0.21 apart. Their total mass is 4.00 .
*Saturday, April 3, 2010 at 11:17pm by Michael*

**Phsyics**

A 75 kg student stands at the top of a 30 m tall building. How much gravitational potential energy does this student possess?
*Thursday, May 24, 2012 at 10:43am by Lissa*

**phsyics **

An airplane has a velocity of 185 miles per hour when it lands, how long must the runway be if the plane decellerates at 2.5 meters per second
*Thursday, July 5, 2012 at 2:09pm by Andrew Moore*

**phsyics**

A 975-kg car accelerates. The magnitude of the average net force acting on the car is 3478 N, what is the acceleration of the car?
*Thursday, December 15, 2011 at 3:57pm by cheryl*

**PHSYICS**

A HIKER SHOUTS TOWARD A VERTICAL CLIFF 685 M AWAY. THE ECHO IS HEARD 4.00 SECONDS LATER. WHAT IS THE SPEED OF SOUND OF THE HIKER'S VOICE IN AIR?
*Sunday, November 7, 2010 at 7:38pm by ROWDY ANDRESS*

**Phsyics - QUICK QUESTION**

what is the the effect on acceleration of increasing the mass of the cart without increasing the force that is causing the acceleration
*Tuesday, October 26, 2010 at 11:58pm by gary*

**Phsyics **

A cannonball is fired into the air with a speed of 42 m/s from a height of 28 m, with what speed does the cannonball hit the ground?
*Monday, April 16, 2012 at 9:04pm by Kelly *

**Phsyics**

acceleration= changevelocty/time Forceaverage= mass*acceleraltion Forceseat= driver mass*acceleration
*Wednesday, October 3, 2007 at 8:43pm by bobpursley*

**Phsyics Plz Help**

PE=m•g•h=75•9.81•15=11036 J. 11036 J is 10% , x is 100% x=110360 J. 110360/17600=6.27 g
*Monday, June 11, 2012 at 6:02pm by Elena*

**Phsyics**

A model rocket is launched at an angle of 80 degrees aboce the x axis, with a velocity of 30m/s. How high will the rocket be 5 seconds after launch? ROund your answer to the nearest tenth
*Tuesday, September 24, 2013 at 11:30am by Derrick*

**Phsyics**

Determine the magnitude and direction of the gravitational force exerted a) on the Moon by Earth and b) on Earth by Moon.
*Tuesday, December 18, 2012 at 7:59pm by g*

**Phsyics**

Hooke's Law and Young's Modulus Can someone please explain this to me. How can one determine if a material behaves according to Hooke's law?
*Friday, October 24, 2008 at 1:33am by Mary*

**Phsyics**

Lee Kite just a fellow question. Why do you need all this help on Physics? You need to do your work on your own. Jiskha Hmework Help Corporations should ban you. Good Day.
*Wednesday, October 3, 2007 at 8:43pm by sydney rae heller*

**phsyics**

upward force on box: P*sin30=P/1 horizontal force: P cos30 at constant speed, pulling force=friction force Pcos30=mu(mg-P/2) solve for P
*Sunday, November 25, 2012 at 6:14pm by bobpursley*

**Phsyics**

see this website to convert I can't post links so, put a / where there is a comma, and the usual other that you put before an address easysurf dot cc,cnver14 dot htm
*Monday, January 17, 2011 at 12:24am by helper*

**phsyics**

a 100 kg block being released from rest over a pulley from a height of 1.0 m. It takes 0.98 s to reach the floor. What is the mass of the block hanging on the other side of the pulley.
*Thursday, September 20, 2012 at 8:59pm by mike*

**Phsyics**

Is an object with a temperature of 273.2 K hotter than, colder than, or at the same temperature as an object with a temperature of 0'C? I don't know how to convert kelvin to celcius.
*Monday, January 17, 2011 at 12:24am by Abida*

**phsyics**

the coefficient of volume expansion for iron is 3.6 X 10^-5/C degrees. If a 17 m long rod of iron is cooled from 100 degrees C to 5 degrees C, What is the new length?
*Wednesday, March 19, 2014 at 10:50pm by mel*

**Phsyics**

I want help with this question. I keep getting it wrong. Please help! Estimate the total amount of translational kinetic energy in a small classroom at normal room temperature. Assume the room measures 5.00 m by 12.0 m by 4.00 m.
*Thursday, May 5, 2011 at 1:33am by Anonymous*

**phsyics**

The reflected sound has a higher frequency, so the insect is approaching. (delta f)/f = 0.4/40 = 0.01 = 2 V/a The number 2 accounts for Doppler shift incident and reflected sound a is the sound speed. Assume a = 340 m/s V = 1.7 m/s
*Thursday, July 19, 2012 at 9:39pm by drwls*

**phsyics**

A 75.0 g bullet is fired at a muzzle velocity of 476 m/s from a gun with a mass 4.75 kg and a barrel length of 60 cm How long is the bullet in the barrel?
*Friday, March 9, 2012 at 1:58pm by Anonymous*

**phsyics**

during a process, 21.6 MJ of heat is added to closed system. if the internal energy is increased by 59.6 MJ, how much work in Btu was done? is the work done on ro by the system?
*Saturday, May 5, 2012 at 9:11pm by mikel*

**phsyics**

a. V = Vp+Vw = 60 + (-40) = 20 km/h. b. V = 60 + 40 = 100 km/h.
*Wednesday, March 19, 2014 at 1:17pm by Henry *

**Phsyics**

You seem to be missing some words in your question. Are you talking about the value of the acceleration of gravity? This questions was asked about a month ago, at which time I suggested an approach to answering it based upon the priciple of superposition. Are you the person ...
*Thursday, April 15, 2010 at 12:41am by drwls*

**phsyics**

please I really need help with these 1. A man pulls a 300 N object across a horizontal surface using a 100 N force applied at a 35° angle. What is the normal force? If the object is pulled at constant speed, what is the coefficient of friction?
*Wednesday, October 13, 2010 at 9:56am by physics LSU*

**phsyics**

A compact disk, which has a diameter of 12.0 cm, speeds up uniformly from zero to 2.50 rev/s in 2.10 s. What is the tangential acceleration of a point on the outer rim of the disk at the moment when its angular speed is the following values? (a) 2.00 rev/s
*Sunday, October 24, 2010 at 5:08pm by mary*

**phsyics**

A 8.0×10−2-{\rm kg} toy airplane is tied to the ceiling with a string. When the airplane's motor is started, it moves with a constant speed of 1.30 m/s in a horizontal circle of radius 0.41 m, Find the angle the string makes with the vertical.
*Thursday, December 16, 2010 at 10:03pm by Lisa*

**phsyics**

Bat is flying 5m/s while chasing an insect that is flying in the same direction. The bat emits 40kHz chirp and hears a 40.4kHz reflected sound wave. What is the speed of the insect? ??? lost
*Thursday, July 19, 2012 at 9:39pm by Jake*

**phsyics**

The electric field intensity between two charged plates is 1.2 103 N/C. The plates are 0.030 m apart. What is the electric potential difference, in volts, between the plates?
*Thursday, January 12, 2012 at 9:33pm by Tammy*

**phsyics**

To move a large crate across a rough floor, you push on it with a force F at an angle of 21¨¬ below the horizontal. The mass of the crate is 31 kg, ¥ìs is 0.57, and ¥ìk is 0.45. Find the force necessary to start the crate moving
*Wednesday, September 19, 2012 at 11:24am by nate*

**Phsyics**

A 110- crate, starting from rest, is pulled across a floor with a constant horizontal force of 380 . For the first 11 the floor is frictionless, and for the next 11 the coefficient of friction is 0.33.What is the final speed of the crate?
*Monday, November 28, 2011 at 1:03pm by sarah*

**phsyics**

circumference = 2 pi r fraction of circumference = 52/360 so (52/60)(2 pi )(6.6)
*Sunday, November 4, 2012 at 2:05pm by Damon*

**Phsyics**

A 69 kg diver jumps off a 10.4 m tower. (a) Find the diver's velocity when he hits the water. m/s (b) The diver comes to a stop 2.0 m below the surface. Find the net force exerted by the water. N
*Wednesday, October 3, 2007 at 8:43pm by Lee Kite*

**Phsyics**

A bullet of mass 1.8 X 10-3 kg is moving at +500. m/s when it impacts a tree stump. It penetrates into the stump 6.00 centimeters before coming to rest. 1. Assuming the acceleration to be constant, calculate the force (including direction) exerted by the stump on the bullet.
*Tuesday, October 26, 2010 at 6:47pm by Rachel*

**Phsyics**

A bullet of mass 1.8 X 10-3 kg is moving at +500. m/s when it impacts a tree stump. It penetrates into the stump 6.00 centimeters before coming to rest. 1. Assuming the acceleration to be constant, calculate the force (including direction) exerted by the stump on the bullet.
*Tuesday, October 26, 2010 at 6:48pm by Rachel*

**Phsyics**

A bullet of mass 1.8 X 10-3 kg is moving at +500. m/s when it impacts a tree stump. It penetrates into the stump 6.00 centimeters before coming to rest. 1. Assuming the acceleration to be constant, calculate the force (including direction) exerted by the stump on the bullet.
*Tuesday, October 26, 2010 at 6:48pm by Rachel*

**phsyics**

Light enters a plate of borosilicate crown glass at an angle of 40.2 degrees with respect to the nor- mal to the air-glass surface. If the index of refraction of the glass is 1.52, find the angle made by the refracted beam with the normal. Answer in units of .
*Sunday, February 27, 2011 at 11:14pm by leslie*

**Basic Phsyics**

A projectile is fired such that the vertical component of its velocity is 49 m/s. The horizontal component of its velocity is 60 m/s. a) how long does the projectile remain in the air? b) what horizontal distance does it travel?
*Tuesday, December 18, 2012 at 3:23pm by Caleb*

**Phsyics - QUICK QUESTION**

F = ma, a = F/m, Acceleration is proportional to the applied force and inversely proportional to the mass. In other words, if you double the force, the acceleration is doubled. Doubling the mass reduces the acceleratin by 1/2.
*Tuesday, October 26, 2010 at 11:58pm by Henry*

**Phsyics**

Can someone give me some pointers on calculating the rest energy of a positron (a particle that has the same mass as an electron and equal but opposite charge) ? thanks The rest energy is equal to the mass times the speed of light squared.
*Thursday, May 24, 2007 at 11:35pm by Jess*

**Phsyics**

rho g h + Pa 1000 kg/m^3 * 9.81 * 66.1 + 101,300 648,441 + 101,300 = 749,741 Pascals 7.50 * 10^5 Pascals two decimal places here only makes sense if using scientific notation
*Thursday, March 13, 2014 at 2:54pm by Damon*

**phsyics**

Coefficient of Linear Exp.=(3.6*10^-5)/3 = 1.2*10^-5/C. L = Lo + a*(T-To)Lo L = 17 + 1.2*10^-5*(5-100)17 = 17 - 0.0194 = 16.981 m.
*Wednesday, March 19, 2014 at 10:50pm by Henry *

**Phsyics**

A 44.0kg seal at an amusement park slides from rest down a ramp into the pool below. The top of the ramp is 1.75m higher than the surface of the water and the ramp is inclined at an angle of 35.0 degrees above the horizontal. What is the coefficient of kinetic friction between...
*Friday, December 17, 2010 at 8:58pm by Lisa*

**Phsyics**

In a shipping yard, a crane operator attaches a cable to a 1130-kg shipping container and then uses the crane to lift the container vertically at a constant velocity for a distance of 30 m. Determine the amount of work done by each of the following. (a) the tension in the ...
*Wednesday, March 26, 2014 at 1:36pm by ANdy*

**phsyics HELP PLEASE**

total weight on floor = 9.8*(40.6+69.1) Newtonns which is the force up from the floor on the crate. for the crate to the person, the person's weight which is 9.8*69.1 Newtons
*Tuesday, November 29, 2011 at 9:25am by Damon*

**phsyics**

1/2 kX^2 is the kinetic energy of the bullet and block after the bullet gets stuck inside. That tells you the velocity V' after impact. (1/2) k X^2 = (1/2)(M+m)V'^2 V' = sqrt[k/(m+M)]* X Once you know V', apply conservation of momentum to the process of the bullet lodging in ...
*Thursday, November 6, 2008 at 5:34pm by drwls*

**Phsyics**

In 2000, NASA placed a satellite in orbit around an asteroid. Consider a spherical asteroid with a mass of 1.00×1016 kg and a radius of 8.50 km. What is the speed of a satellite orbiting 4.70 km above the surface? What is the escape speed from the asteroid?
*Tuesday, April 13, 2010 at 3:16pm by Mikhail Moskvich*

**Phsyics**

The forces are the same, but in opposite directions. The Earth pulls the moon and vice versa. The force is G*M*m/R^2 G = universaL constant of gravity m = lunar mass M = Earth mass R = earth-moon separation The force also equals m*V^2/R where V is the velocity of the moon its ...
*Tuesday, December 18, 2012 at 7:59pm by drwls*

**Phsyics**

How might they use spectroscopy to deter- mine the atmospheric composition of these planets? 1. None of these 2. By analyzing the spectrum of the surface of the planets. 3. All of these 4. By analyzing the molecules that compose the planets. 5. By analyzing the spectrum of the...
*Wednesday, November 13, 2013 at 9:23pm by Andrew*

**phsyics**

I was wondering what the difference in current would be in one full extension cord versus several extension cords (which equal the same length as the first) attatched together? I was thinking there would be more resistance when the current goes from one cord to another but I'm...
*Monday, May 11, 2009 at 10:05am by Lena*

**phsyics**

an 8g bullet is shot into a 4kg block at rest on a frictionless horizontal surface. the bullet remains lodged in the block. the block movies into a spring and compresses it by 3cm. the force constant of the spring is 1500N/m. the initial speed of the bullet is closest to?
*Thursday, November 6, 2008 at 5:34pm by joyce*

**Phsyics**

The center of a 1.10km diameter spherical pocket of oil is 1.10km beneath the Earth's surface. Estimate by what percentage directly above the pocket of oil would differ from the expected value of for a uniform Earth? Assume the density of oil is . Express your answer using two...
*Thursday, April 15, 2010 at 12:41am by Mikhail*

**phsyics**

A brick of mass 1.5 kg slides down an icy roof inclined at 30.0° with respect to the horizontal. (a) If the brick starts from rest, how fast is it moving when it reaches the edge of the roof 1.75 m away? Ignore friction. m/s ? (b) Redo part (a) if the coefficient of kinetic ...
*Monday, February 27, 2012 at 12:50am by Jacky*

**phsyics**

An elevator with a weight of 27.9 kN is given an upward acceleration of 1.46 m/s2 by a cable. (a) Calculate the tension in the cable. (b)What is the tension when the elevator is decelerating at the rate of 1.46 m/s2 but is still moving upward?
*Thursday, September 23, 2010 at 8:07pm by harrypotter*

**phsyics**

An elevator with a weight of 27.9 kN is given an upward acceleration of 1.46 m/s2 by a cable. (a) Calculate the tension in the cable. (b)What is the tension when the elevator is decelerating at the rate of 1.46 m/s2 but is still moving upward?
*Thursday, September 23, 2010 at 8:07pm by harrypotter*

**phsyics HELP PLEASE**

A 40.6-kg crate rests on a horizontal floor, and a 69.1-kg person is standing on the crate. Determine the magnitude of the normal force that (a) the floor exerts on the crate and (b) the crate exerts on the person.
*Tuesday, November 29, 2011 at 9:25am by darren*

**Phsyics**

A 40.6-kg crate rests on a horizontal floor, and a 69.1-kg person is standing on the crate. Determine the magnitude of the normal force that (a) the floor exerts on the crate and (b) the crate exerts on the person.
*Monday, November 28, 2011 at 1:03pm by darren*

**phsyics**

A 40.6-kg crate rests on a horizontal floor, and a 69.1-kg person is standing on the crate. Determine the magnitude of the normal force that (a) the floor exerts on the crate and (b) the crate exerts on the person.
*Monday, November 28, 2011 at 6:59pm by darren*