Monday

April 21, 2014

April 21, 2014

Total # Posts: 102

**math**

where the arithmatic mean and geometric mean used in real life?

**Physics**

A coaxial transmission line has a solid inner conductor of radius a and a thin-walled outer conductor of radius b. The medium between the conductors has permeability (Mu)0. Find the inductance per meter of length of the line (a) if all current of the inner conductor is on its ...

**physics**

1.A car is traveling a road that includes two sides of an equilateral triangle with a constant speed s. What is the magnitude of the average velocity v of the car? 2.A ship crosses a river aiming at the angle theta to the left from the straight courses. The speed of the ship w...

**physics**

1.A car is traveling a road that includes two sides of an equilateral triangle with a constant speed s. What is the magnitude of the average velocity v of the car? 2.A ship crosses a river aiming at the angle theta to the left from the straight courses. The speed of the ship w...

**physics**

A car is traveling a road that includes two sides of an equilateral triangle with a constant speed s. What is the magnitude of the average velocity v of the car?

**physics**

An object moves from the position r1=(2,-10,3)m to the position r2=(-2,3,7)m and then to r3=(3,-4,-2)m. Find a)displacement b)distance

**physics**

A stationary 1.67 kg object is struck by a stick. The object experiences a horizontal force given b F = at-bt^2, where t is the time in milliseconds from the instant the stick first contacts the object. If a = 1500 N/ms and b = 20N/ms^3, what is the speed of the object just af...

**physics**

A cylindrical glass is 6cm wide. When you look from above at an angle you see the edge of the bottom of the glass. When the glass is then filled with water (1.33) you see the center of the bottom of the glass. How tall is the glass?

**physics**

An EF 151 GTA sits on the EF stool and rotates CCW with an initial speed of 60 rpm. After 28 revolutions he stops. Assuming constant acceleration, how long was he rotating?

**physics**

Posted by sandhu on Tuesday, November 30, 2010 at 7:38pm. Posted by sandhu on Tuesday, November 30, 2010 at 1:17am. A T is made of two identical 740 g thin solid rods. The moment of inertia of the T about an axis perpendicular to the screen through point at one end of a rod is...

**physics**

Posted by sandhu on Tuesday, November 30, 2010 at 1:17am. A T is made of two identical 740 g thin solid rods. The moment of inertia of the T about an axis perpendicular to the screen through point at one end of a rod is determined experimentally to be 0.68 kg-m2. What is the l...

**physics**

An EF 151 GTA sits on the EF stool and rotates CCW with an initial speed of 60 rpm. After 28 revolutions he stops. Assuming constant acceleration, how long was he rotating?

**physics**

the bottom of the T

**physics**

the bottom of the T

**physics**

A T is made of two identical 740 g thin solid rods. The moment of inertia of the T about an axis perpendicular to the screen through point at one end of a rod is determined experimentally to be 0.68 kg-m2. What is the length of the rods?

**physics**

An EF 151 GTA sits on the EF stool and rotates CCW with an initial speed of 60 rpm. After 28 revolutions he stops. Assuming constant acceleration, how long was he rotating?

**physics**

An EF 151 GTA sits on the EF stool and rotates CCW with an initial speed of 60 rpm. After 28 revolutions he stops. Assuming constant acceleration, how long was he rotating?

**physics**

Posted by sandhu on Sunday, November 28, 2010 at 10:03pm. A 7200 lb airplane lands on an aircraft carrier with a speed of 72 ft/s. The plane is caught by an elastic band (k=998 lb/ft) that has an initial stretch of 5.6 feet. What is the maximum distance the band is stretched? ...

**Physics**

Should the initial stretch of 5.6 ft be added to X to find the maximum distance the band is stretched?

**Physics**

It is a timely help.Thanks

**Physics**

A 7200 lb airplane lands on an aircraft carrier with a speed of 72 ft/s. The plane is caught by an elastic band (k=998 lb/ft) that has an initial stretch of 5.6 feet. What is the maximum distance the band is stretched?

**physics**

Thank you very much.

**physics**

A block starts with a speed of 18.0 m/s and slides for a distance of 2.2 m down a 40° ramp (muk = 0.43). What is its final speed? (m/s) Thanks for suggeting the following solution. The block starts with an initial speed of 18.0 m/s.Does it have any effect? Final KE = PE lo...

**physics**

thanks a lot

**physics**

Lazydog and his tractor (1330 kg) are pulling a trailer (530 kg) up a 7° hill. The trailer wheels roll freely. What is the magnitude of the force in the coupling between the tractor and trailer when their velocity is 8.7 m/s up the hill and they are slowing down at a rate ...

**physics**

Lazydog and his tractor (1330 kg) are pulling a trailer (530 kg) up a 7° hill. The trailer wheels roll freely. What is the magnitude of the force in the coupling between the tractor and trailer when their velocity is 8.7 m/s up the hill and they are slowing down at a rate ...

**physics**

Lazydog and his tractor (1330 kg) are pulling a trailer (530 kg) up a 7° hill. The trailer wheels roll freely. What is the magnitude of the force in the coupling between the tractor and trailer when their velocity is 8.7 m/s up the hill and they are slowing down at a rate ...

**physics**

A basketball is thrown with a velocity of 10.5 ft/s downward from a height of 6.8 ft. The coefficient of restitution between the ball and the floor is 0.65. How high does the basketball go after its 2nd bounce?

**physics**

A basketball is thrown with a velocity of 10.5 ft/s downward from a height of 6.8 ft. The coefficient of restitution between the ball and the floor is 0.65. How high does the basketball go after its 2nd bounce?

**physics**

Posted by sandhu on Thursday, November 25, 2010 at 6:23am. A block starts with a speed of 18.0 m/s and slides for a distance of 2.2 m down a 40° ramp (ìk = 0.43). What is its final speed? (m/s) physics - drwls, Thursday, November 25, 2010 at 9:19am Final KE = PE los...

**physics**

What about the initial speed of 18.0 m/s when it starts?

**physics**

A block starts with a speed of 18.0 m/s and slides for a distance of 2.2 m down a 40° ramp (ìk = 0.43). What is its final speed? (m/s)

**physics**

Thank you very much

**physics**

Thank you for clarifying

**physics**

Posted by sandhu on Wednesday, November 24, 2010 at 4:29am. The firetruck goes around a 180°, 162 m radius circular curve. It enters the curve with a speed of 12.6 m/s and leaves the curve with a speed of 38.8 m/s. Assuming the speed changes at a constant rate, what is the...

**physics**

A 3640 lb roller coaster experiences a constant air-resistance force of 26 lb and a constant friction force of 20 lb. What initial velocity is required for the coaster to make it around the 0.57 mile track and coast to a stop at its starting location?

**physics**

I don't understand how you get At = (38.8 - 12.6)/L.Please explain Thanks.

**physics**

The firetruck goes around a 180°, 162 m radius circular curve. It enters the curve with a speed of 12.6 m/s and leaves the curve with a speed of 38.8 m/s. Assuming the speed changes at a constant rate, what is the magnitude of the total acceleration of the firetruck just a...

**physics**

yes

**physics**

An animal and its tractor (1330 kg) are pulling a trailer (530 kg) up a 7° hill. The trailer wheels roll freely. What is the magnitude of the force in the coupling between the tractor and trailer when their velocity is 8.7 m/s up the hill and they are slowing down at a rat...

**physics**

Thanks for the timely help.

**physics**

A 33300 lb (earth weight) rocket in outer space has two constant forces acting upon it, F1 = (-166i + 392j) lb and F2 = (50i + -54j) lb. Its initial velocity is (39i + 64j) ft/s. How far is it from where it started after 33 seconds?

**physics**

A 33300 lb (earth weight) rocket in outer space has two constant forces acting upon it, F1 = (-166i + 392j) lb and F2 = (50i + -54j) lb. Its initial velocity is (39i + 64j) ft/s. How far is it from where it started after 33 seconds?

**physics**

thanks a lot

**physics**

A 3670 lb car going around an unbanked curve at a constant speed of 25 mph begins to slide (ìs=0.55 and ìk=0.45). What is the radius of the curve?

**physics**

1.A firetruck is traveling at a velocity of +20 m/s in the x direction. As the truck passes x=63m it shoots a tennis ball backwards with a speed of 20 m/s relative to the truck at an angle of 39° from a height of 1.4 m. Neglect air resistance. At what x value does the tenn...

**physics**

1.A firetruck is traveling at a velocity of +20 m/s in the x direction. As the truck passes x=63m it shoots a tennis ball backwards with a speed of 20 m/s relative to the truck at an angle of 39° from a height of 1.4 m. Neglect air resistance. At what x value does the tenn...

**physics**

Thanks

**physics**

An outfielder throws a baseball from the outfield to the third baseman. In flight, the ball reaches a height of 25 ft above the ground. The outfielder releases the ball from a height of 6 ft above the ground with a speed of 124 ft/sec. The ball is caught 6 ft above the ground ...

**physics**

Thanks a lot

**physics**

An 3730 kg airplane has a center of mass located 32 m from the front of the plane. A 123 kg man sits 25 m from the front of the plane. Where should a 76 kg woman sit so that the center of mass of the loaded plane is the same as the empty airplane? (m from front)

**physics**

A firetruck is traveling at a velocity of +20 m/s in the x direction. As the truck passes x=63m it shoots a tennis ball backwards with a speed of 20 m/s relative to the truck at an angle of 39° from a height of 1.4 m. Neglect air resistance. At what x value does the tennis...

**physics**

A firetruck is traveling at a velocity of +20 m/s in the x direction. As the truck passes x=63m it shoots a tennis ball backwards with a speed of 20 m/s relative to the truck at an angle of 39° from a height of 1.4 m. Neglect air resistance. At what x value does the tennis...

**physics**

A firetruck is traveling at a velocity of +20 m/s in the x direction. As the truck passes x=63m it shoots a tennis ball backwards with a speed of 20 m/s relative to the truck at an angle of 39° from a height of 1.4 m. Neglect air resistance. At what x value does the tennis...

**physics**

A football on the moon (1/6 earth's gravity) is kicked straight up with an initial velocity of +14.5 m/s. If it starts 2.7 m above the surface, how much time has passed until it is 16.8 m above the surface and on its way down?

**physics**

In a panic stop, a 109 ton train can slow down with an acceleration of 0.08 g's. What is the time required to stop a train from a speed of 53 mph?

**physics**

A room is 3.4 smoots wide, 7.1 smoots long, and 1.5 smoots high. 28% of the room's walls are windows and doors. Determine the inside wall surface area of a 1/20 scale model of the room. (sq. in)

**physics**

Thank you very much

**physics**

The Cedar Bluff express KAT bus averages 5 mph for 17 minutes, and then 44 mph for 13 minutes. What was its average speed? (mph)

**physics**

Thanks a lot

**physics**

In the Melde's string apparatus, why there is no standing wave in the segment between the pulley and mass hanger?

**physics-acoustics**

1.A wall between two rooms is 20 x 9 ft. The wall construction has Transmission Loss 50 dB at 1000 Hz. In the wall is a small window of size 4 x 2 ft. The window has a tested Transmission Loss of 20 dB at the same frequency. The receiving room has 200 ft^2 Sabine absorption. W...

**physics-acoustics**

1.A wall between two rooms is 20 x 9 ft. The wall construction has Transmission Loss 50 dB at 1000 Hz. In the wall is a small window of size 4 x 2 ft. The window has a tested Transmission Loss of 20 dB at the same frequency. The receiving room has 200 ft^2 Sabine absorption. W...

**physics**

10 moles of a gas initially at temperature 300 K is compressed adiabatically from a volume of 2 cm3 to a volume of 325 cm3. To the nearest tenth of a joule what is the work done by the piston? (It is a monatomic ideal gas.)

**physics**

You inflate your car tires to a gauge pressure of 2.43 atmospheres at a temperature of 24 degrees C. After driving a couple of miles the temperature of the tire increases by 46 degrees C. What is the new gauge pressure to the nearest hundredth of an atmosphere? What fraction o...

**physics**

A vibrating stretched string has length 31 cm, mass 19 grams and is under a tension of 38 newtons. What is the frequency of its 3rd harmonic? If the source of the wave is an open organ pipe of the same length as the wire, what would be the frequency of the 4 th harmonic?

**Physics**

One very long wire carries a current of 30A to the left along the x-axis.A second very long wire carries a current of 50A to the right along the line(y=0.280m,z=0) A)Where in the plane of the two wires is the total magnetic field equal to zero? B)A particle with a charge of -2...

**physics**

Two men are carrying a 9.00-m telephone pole that has a mass of 115 kg. If the center of gravity of the pole is 3.00 m from the right end, and the men lift the poles at the ends, how much weight must each man support?

**Physics**

hanging vertically

**Physics**

A 1.5 kg block is connected by a rope across a 50-cm-diameter, 2.0 kg, frictionless pulley. A constant 10 N tension is applied to the other end of the rope. Starting from rest, how long does it take the block to move 30 cm?

**physics**

1.A tall pole and a short pole (both having the same diameter and mass density) are both standing straight up. Both are allowed to tip and fall, starting from rest, at the same time. Which reaches the ground first? 2.When a non-vertical projectile strikes the ground, which par...

**Physics**

1.A net force that is linearly increasing in time is applied to an object. What is time dependence of the object's kinetic energy? 2.A tire is rolling along a road, without slipping, with a center of mass velocity of v. A piece of tape is attached to the tire. When the tap...

**Physics**

Is it possible for the frictional force to increase the mechanical energy of a system? If so, give 2 examples with brief explanations. If not, why not?

**physics**

A ball rolls up a ramp which abruptly ends with the ramp dropping straight down. The ball launches off the end of the ramp while still traveling at an upward trajectory, goes through projectile motion, and returns to the same height as the base of the ramp. Ignoring any slowin...

**Physics**

Thanks

**Physics**

A 0.24-kg object traveling rightward at 3.5 m/s collides head-on and elastically with a 0.40-kg object traveling leftward at 2.1 m/s. (a) what are their velocities after collision? (b) If the objects are in contact for 0.010 s during collision, what is the magnitude of the ave...

**Physics**

A sign is supported by a cable and a horizontal beam.The beam has a length 1.4 m and a uniform mass of12 kg.a) If the cable is attached to the beam at a distance of 1.0 m from the hinge, what is the tension in the cable? (b) If the cable breaks, what is the net torque on the b...

**Physics**

(a).A 220-kg sleigh is pulled by one horse at constant velocity for 0.90 km on a snowy, horizontal surface, the coefficient of kinetic friction between the sleigh runners and snow is 0.27. What power must the horse deliver to the sleigh for the trip to take 9 minutes? (b) Imag...

**Physics**

A 12.0 kg shell is launched at an angle of 55 degrees above the horizon with an initial velocity of 150 m/s. When at its highest point, the shell explodes into 2 fragments - 1 fragments is 3 times heavier than the other. The 2 fragments reach the ground at the same time, ignor...

**Physics**

A 0.150 kg frame is suspended from a coil spring, and stretches 0.050m. A 0.200 kg block is dropped from rest onto the fram from a height of 30.0cm. Find the maximum distance the fram moves downward from the initial position?

**Physics**

Solve for velocity at 2.0s vx = v0x + axt vx = (-1m/s) + (0.5m/s2)(2.0s) vx = 0m/s vy = v0y + ayt vx = (3m/s) + (-0.9m/s2)(2.0s) vx = 1.2m/s v = 0m/s(x hat) + 1.2m/s(y hat) Calculate displacement. ∆x = v0xt + 1/2axt2 ∆x = (-1m/s)(2.0s) + 1/2(0.5m/s2)(2.0s)2 ∆...

**Physics**

A particle's initial velocity is given by vox = -1.0 m/s and voy = 3.0 m/s. Its acceleration is ax = 0.50 m/s^2 and ay = -0.90 m/s^2 (a) Calculate its velocity 2.0 s later. (b) Calculate its displacement at that time.

**Physics**

Thanks

**Physics**

A ball is fired from a height of 3.0 m above the ground,with a speed of 13 m/s and an angle of 22 degrees below the horizontal.(a) At what time does the ball hit the ground? (b) What is the impact velocity?

**physics**

Given two particles with 2.00 micro coulomb charges as shown and a particle with a charge q=1.28x16-18C at the origin. (A)What is the net force exerted by the two 2.00 micro coulomb charges on test charge q? (B)What is the electric field at the origin due to the two 2.00micro ...

**physics**

A thin ring of radius equal to 25 cm carries a uniformly distributed charge of 4.7 nC. What is the electric field and potential difference at the center of the ring?

**physics**

A large conducting plate of area equal to 4.0 m^2 has an evenly distributed surface charge of + 3.4 micro coulomb on its surface.A point charge of mass equal to 5.3 x 10^-6 kg and carrying a charge of 1.2 nC is held at 10 cm above the center of the plate.Determine the followin...

**Physics**

A thin ring of radius equal to 25 cm carries a uniformly distributed charge of 4.7 nC. What is the electric field and potential difference at the center of the ring?

**physics**

A large conducting plate of area equal to 4.0 m^2 has an evenly distributed surface charge of + 3.4 micro coulomb on its surface.A point charge of mass equal to 5.3 x 10^-6 kg and carrying a charge of 1.2 nC is held at 10 cm above the center of the plate.Determine the followin...

**Physics**

A square plate of copper with 50 cm sides has no net charge and is placed in a region of uniform electric field of 80.0 kN/C directed perpendicular to the plate. Find (a) thr charge density at each face of the plate and (b) the total charge on each face.

**physics**

A ball is thrown upward from the top of a 40.0 m tall building. The ball's initial speed is 12.0 m/s. At the same instant, a person is running on the ground at a distance of 31.0 m from the building. What must be the average speed of the person if he is...

**Physics**

In wandering, a grizzly bear makes a displacement of 1588 m due west, followed by a displacement of 3390 m in a direction 38.0° north of west. What are the magnitude and the direction of the displacement needed for the bear to return to its st...

**Physics**

Thanks a lot

**Physics**

A man drops a stone into a water well on his farm. He hears the sound of the splash 3.25 s later. The acceleration of gravity is 9.8 m/s2 and the speed of sound in air is 326 m/s. How deep is the well?

**Physics**

A tennis ball is dropped from 1.41m above the ground. It rebounds to a height of 0.932 m.The acceleration of gravity is 9.8 m/s2 .(a)With what velocity does it hit the ground?(Let down be negative.) Answer in units of m/s. (b)With what velocity does it leave the ground? Answer...

**Physics**

How do we know that 6 seconds of uniform acceleration at 60 mph is equivalent to 6 seconds travel at 30 mph?

**Physics**

Two point charges of magnitudes -6.25 nano coulomb and -12.5 nano coulomb are separated by 25.0 cm There is a point A between the line joining the two charges at a distance 10.0 cm from the charge -12.5 nano coulomb.Find the magnitude of the net electric field these charges pr...

**Physics**

Two point charges q1 and q2 are held 4.00 cm apart vertically. An electron released 3 cm from the middle point that is equidistant from both charges undergoes an initial acceleration of 8.95 X 10^18 m/s2 directly upward,parallel to the line connecting q1 and q2 .Find the magni...

**Physics**

Two point charges q1 and q2 are held 4.00 cm apart vertically. An electron released 3 cm from the middle point that is equidistant from both charges undergoes an initial acceleration of 8.95 X 10^18 m/s2 directly upward,parallel to the line connecting q1 and q2 .Find the magni...

**Physics**

Two point charges q1 and q2 are held 4.00 cm apart vertically. An electron released at the middle point that is equidistant from both charges undergoes an initial acceleration of 8.95 X 10^18 m/s2 directly upward,parallel to the line connecting q1 and q2 .Find the magnitude an...