# Posts by archi

Total # Posts: 28

**calculus - please help!**

thank you soo much! :D

*February 9, 2012*

**calculus - please help!**

Find the volume of the solid obtained by rotating the region bounded by the given curves about the specified axis. y=2+1/x^4,y=2,x=4,x=9; about the x-axis.

*February 9, 2012*

**physics please help!!**

A parallel plate capacitor with plate separation d is connected to a battery. The capacitor is fully charged to Q Coulombs and a voltage of V Volts. (C is the capacitance and U is the stored energy.) Select true or false for each statement. 1) With the capacitor connected to ...

*February 6, 2012*

**physics please help!!**

A charge, Q2 = -9.00x10-6 C, is 12.00 cm to the right of charge Q1 = 10.00x10-6 C. Where can a third charge be placed, along the line connecting Q1 and Q2, such that it experiences no net force? Give distances relative to Q1 and use a plus sign if the third charge is to the ...

*January 23, 2012*

**physics please help!!**

You are looking into the headlights of a distant vehicle on an autoroute in France. The driver has shown his resistance to the Europeanization of Europe by resolutely continuing to use yellow headlights (wavelength 550. nm). a) What is the theoretical limit of angular ...

*November 29, 2011*

**physics please help!!**

You wish to have a plane pocket mirror that is as discreet as possible but with which you can see the whole width of your face. If your face is 22.0 cm wide, what is the minimum width, in cm, of the mirror for you to be able to see the whole width of your face in one eye?

*November 29, 2011*

**physics please help!!**

You are lost in the woods with a friend. He's nearsighted and you're farsighted. You decide to start a fire to attract attention. Thankfully, it's a bright sunny day and you're both wearing your glasses. Whose glasses do you use to focus the sun's light to ...

*November 28, 2011*

**physics please help!!**

A satellite dish is designed to pick up radio waves from geostationary satellites about 36000 km about the Earth's surface. If the dish's surface is a part of a sphere of radius R, where should the receiver be placed compared to the center of the dish? 1. At a distance...

*November 24, 2011*

**physics please help!!**

You're standing several meters away from a regular (plane) mirror. The mirror has water spots on its surface. Can you see both the spots and yourself in focus at the same time?

*November 22, 2011*

**calculus - please help!**

Water is leaking out of an inverted conical tank at a rate of 13200 cubic centimeters per min at the same time that water is being pumped into the tank at a constant rate. The tank has height 9 meters and the diameter at the top is 7 meters. If the water level is rising at a ...

*November 7, 2011*

**calculus - please help!**

If two resistors R1 and R2 are connected in parallel, then the total resistance R measured in ohms is given by 1/R=1/R1+1/R2 If the resistance of R1 and R2 are increasing at 330 and 660 ohms per second respectively, then the rate of increase of R when R1=5000 and R2=5000 is ...

*November 7, 2011*

**physics please help!!**

In the design of a supermarket, there are to be several ramps connecting different parts of the store. Customers will have to push grocery carts up the ramps and it is obviously desirable that this not be too difficult. The engineer has done a survey and found that almost no ...

*October 29, 2011*

**calculus - please help!**

Find the slope of the tangent line to the curve (3x+3y−27)^(1/2)+(2xy−39)^(1/2)=8 at the point (8,4).

*October 25, 2011*

**physics please help!!**

Two acrobats, each of 78.0 kg, launch themselves together from a swing, holding hands. Their velocity at launch was 6.80 m/s and the angle of their initial velocity relative to the horizontal was 28.0 degrees upwards. At the top of their trajectory, their act calls for them to...

*October 17, 2011*

**physics please help!!**

A 0.267kg ball is thrown straight up from 2.20m above the ground. Its initial vertical speed is 9.20m/s. A short time later, it hits the ground. Calculate the total work done by the force of gravity during that time.

*October 11, 2011*

**physics please help!!**

A 0.267kg ball is thrown straight up from 2.20m above the ground. Its initial vertical speed is 9.20m/s. A short time later, it hits the ground. Calculate the total work done by the force of gravity during that time.

*October 10, 2011*

**physics please help!!**

so, in this case its 9cm?

*October 6, 2011*

**physics please help!!**

what is x?

*October 6, 2011*

**physics please help!!**

A moving 2.20kg block collides with a horizontal spring whose spring constant is 419 N/m. The block compresses the spring a maximum distance of 9.00cm from its rest postion. The coefficient of kinetic friction between the block and the horizontal surface is 0.140. a) What is ...

*October 6, 2011*

**physics**

In mid-nineteenth century England horses were often used to pull barges along canals. The horse, naturally, trudged along a path parallel to the canal and so the rope to the barge was at an angle to the motion of the barge. If such a horse was pulling with a force of 175 N at ...

*October 6, 2011*

**physics please help!!**

thanks!

*October 6, 2011*

**physics please help!!**

Hung vertically, a massless spring extends by 3.00 cm when a mass of 992.0 g is attached to its lower end. The same mass and spring are then placed apart on a table. The spring is fixed in place and then the mass is given a velocity of 0.800 m/s towards the spring. a) What is ...

*October 6, 2011*

**calculus - please help!**

nvm - i got the answer!

*October 2, 2011*

**calculus - please help!**

if f is a function such that lim x->6,f(x)=-5, evaluate lim x->6 -2f(x)+5f(x+3).

*October 2, 2011*

**Physics please help!!**

You are walking at 4.40 km per hour across a frozen lake in the snow. You do not realize that with each step you turn 0.40 degrees to your right. If your step length is 58.0 cm what is the diameter, in meters, of the circle that you are inadvertently tracing out?

*October 1, 2011*

**physics please help!!**

One of the methods used to train astronauts for the effects of "zero gravity" in space is to put them in a specially equipped plane which has been stripped of seats and fitted with padded walls. The pilot then takes the plane up to an altitude of typically 8700 ...

*September 25, 2011*

**physics**

A mass M = 21.00 kg is suspended by a massless string from the ceiling of a van which is moving with constant acceleration a, as shown in the figure. If the string makes an angle theta = 28.00 degrees with respect to the vertical, what is the acceleration a of the van?

*September 25, 2011*

**6th grade Science**

A homozygous round seeded plant is crossed with a homozygous wrinkled seeded plant. what are the gentypes of the parents?

*November 12, 2009*

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