Tuesday

September 23, 2014

September 23, 2014

Total # Posts: 22

**Trigonometry**

a barn has a gable roof whose rafters are 20 feet long. the width of the barn is 30 feet. find the angle that the rafters make with the horizontal. find the area of one of the gable ends.
*June 29, 2014*

**Algebra**

Write the equation of the line containing the given point and parallel to the given line. The equation of the line is y= Express your answer in the form y=mx+b. (-8,9); 2x=9y+4
*May 25, 2011*

**Algebra**

Write the equation of the line containing the given point and parallel to the given line. The equation of the line is y= Express your answer in the form y=mx+b. (7,8); x+7y=6 Express your answer in the form y=mx+b. (8,9); 5x+y=9 Express your answer in the form y=mx+b. (2,-6); ...
*May 25, 2011*

**physics**

Two very large parallel sheets are 5.00 cm apart. Sheet A carries a uniform surface charge density of -9.00 microcoulombs per meter squared, and sheet B, which is to the right of A, carries a uniform charge of -11.6 microcoulombs per meter squared. Assume the sheets are large ...
*January 25, 2010*

**physics-PLEASE ANSWER, it's due today!**

One end of a copper rod is immersed in boiling water at 100 degrees celsius and the other end in an ice-water mixture at 0 degrees celsius. The sides of the rod are insulated. After steady-state conditions have been achieved in the rod, 0.180 kg of ice melts in a certain time ...
*December 7, 2009*

**physics, PLEASE ANSWER, I really need help!**

oh, never mind, I got it, I was using the wrong value for the constant, thanks!
*December 6, 2009*

**physics, PLEASE ANSWER, I really need help!**

I did that but the website that I do the homework on says my answer is wrong. Here are the numbers I plugged in: (1.9 )(5.67*10^8)((31+273)^4 - (19+273)^4) and I get the answer is 1.37*10^18 but it says that's wrong
*December 6, 2009*

**physics, PLEASE ANSWER, I really need help!**

The basal metabolic rate is the rate at which energy is produced in the body when a person is at rest. A 70.0 kg person of height 1.79 m would have a body surface area of approximately 1.90 m^2. What is the net amount of heat this person could radiate per second into a room at...
*December 6, 2009*

**Physics**

If you have angular velocity and you need angular displacement, just remember: velocity=displacement/time so solve that for displacement and it's displacement=velocity*time so it should be angular displacement=(197 rad/s)(2.5 s) and your answer should be 492.5 rad, be ...
*December 6, 2009*

**physics**

To find the resultant, separate each of the vectors into x and y components so it should be: v1: 15x + 0y v2: 0x + 25 y add those together and the resultant vector is: resultant vector: 15x + 25y to get the magnitude, you do the square root of the x-comp squared plus the y-...
*December 6, 2009*

**physics**

The basal metabolic rate is the rate at which energy is produced in the body when a person is at rest. A 70.0 kg person of height 1.79 m would have a body surface area of approximately 1.90 m^2. What is the net amount of heat this person could radiate per second into a room at...
*December 6, 2009*

**Physics-PLEASE ANSWER, it's due soon!**

I'm putting in the answer I get but the website that I do the homework on says the answer is wrong. I'm getting 94.77 K for final temperature, but it says that's wrong. What should I do?
*December 5, 2009*

**Physics-PLEASE ANSWER, it's due soon!**

A copper calorimeter can with mass 0.202 kg contains 0.185 kg of water and 1.40×10^−2 kg of ice in thermal equilibrium at atmospheric pressure. If 0.900 kg of lead at a temperature of 417 degrees celsius is dropped into the can, what is the final temperature of the...
*December 5, 2009*

**physics**

A copper calorimeter can with mass 0.202 kg contains 0.185 kg of water and 1.40×10^−2 kg of ice in thermal equilibrium at atmospheric pressure. If 0.900 kg of lead at a temperature of 417 degrees celsius is dropped into the can, what is the final temperature of the...
*December 5, 2009*

**physics**

An 8.56 kg block of ice at 0 degrees celsius is sliding on a rough horizontal icehouse floor (also at 0 degrees celsius) at 15.6 m/s. Assume that half of any heat generated goes into the floor and the rest goes into the ice. How much ice (in kg) has melted after the speed of ...
*December 4, 2009*

**physics**

A resting person requires 14.5 L of oxygen per hour to maintain metabolic activities. Such a person breathes in 0.480 L of air at approximately 25.0 degrees celsius with each breath. The inhaled air is 20.9% while the exhaled air is 16.3%. How many oxygen molecules does a ...
*December 3, 2009*

**physics**

I wasn't given the thermal conductivity of the fur layer, all the info the problem gives is included above...
*December 2, 2009*

**physics**

Animals in cold climates often depend on two layers of insulation: a layer of body fat [of thermal conductivity 0.200 W/mK] surrounded by a layer of air trapped inside fur or down. We can model a black bear (Ursus americanus) as a sphere 1.50 m in diameter having a layer of ...
*December 2, 2009*

**physics**

Water flows steadily from an open tank into a pipe. The elevation of the top of the tank is 10.2 m, and the elevation at the pipe is 3.90 m. The initial cross-sectional area of the pipe is 6.40×10^−2 m; and at where the water is discharged from the pipe, it is 2.30...
*November 30, 2009*

**physics**

What is the amount of heat entering your skin when it receives the heat released by 26.4 g of steam initially at 100 degrees celsius that cools to 34.3 degrees celsius?
*November 29, 2009*

**physics**

A small 5.00 kg brick is released from rest 3.00 m above a horizontal seesaw on a fulcrum at its center, with a radius of 1.60 m. Find the angular momentum of this brick about a horizontal axis through the fulcrum and perpendicular to the plane of the figure the instant the ...
*November 2, 2009*

**calculus**

find the solution of the differential equation dy/dt = ky, k a constant, that satisfies the given conditions: y(0)=50, y(5)=100 please show steps. INtegrate dy/dt I think the answer will be in the form of y=e^kt + C check that and see if it works. You should be memorizing your...
*April 10, 2007*

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