how many kilojoules of heat must be transferred to a 480 g aluminum pizza pan to raise its temperature from 22 degree c to 234 degree c? The specific heat of aluminum in this temperature range is 0.97 J/g degree C.
October 28, 2011
Dale is choosing between two exercise routines. In Routine #1, he does only running, burning 10 calories per minute. In Routine #2, he burns 10 calories walking. He then runs at a rate that burns 8 calories per minute. For what amounts of time spent running will Routine #1 ...
October 17, 2011
I have a case study to do and I'm not sure how to go about it. I need to find the present value for three different offers, all of which have a 10% rate and ordinary annuities. This is the first offer: $1,000,000 now $200,000 each year for years 6 through and including ...
October 11, 2011
I have this question and I am pretty sure on what to use to solve it but I am just stuck. The reaction of 8 g of hydrogen and 28 g of carbon monoxide gave 16 g of methanol. What was the theoretical yield if the percent yield was 50%? actual yield ________________ X 100% = ...
September 16, 2011
. A water heater can has a power of 350 W. It is placed in a container filled with 1 litres of water with a temperature of 40 ºC. The heater is then allow to run for 1 hour. How much water will there be left in the container after 1 hour? (Specific heat capacity of water...
August 7, 2011
A 3.00-liter aluminum cylinder at 5.00°C is filled to the brim with gasoline at the same temperature. If the aluminum and gasoline are warmed to 52.0°C, how much gasoline spills out? [Hint: Be sure to account for the expansion of the container. Also, ignore the ...
June 15, 2011
The driveshaft of a buildings air-handling fan is turned at 300 RPM by a belt running on a 0.3-m-diameter pulley. The net force applied by the belt on the pulley is 2000 N. determine the torque applied by the belt on the pulley, in N.m, and the power transmitted, in kW.
May 10, 2011
Air loses heat to the surroundings at a rate of Q.= t/6 where out Q. is in Watts and t is time in seconds. For 20 minutes of operation, determine the heat loss from the air in kWhr???
May 10, 2011
Using Monte Carlo simulation, calculate the price of a 1-year European option to give up 100 ounces of silver in exchange for 1 ounce of gold. The current prices of gold and silver are $380 and $4, respectively; the risk-free interest rate is 10% per annum; the volatility of ...
April 25, 2011
My homework has a list of numbers and I'm working with standard deviation. I know the standard deviation as well as the mean and everything, but it says to find "the weight that is 3 standard deviations below the mean." What is the formula for that, and can I do ...
April 19, 2011
b) It is done by Carbon dating. Carbon is the basic basic building block of life and has an amazing memory. Rays of the Sun which are radioactive enter our atmosphere and collide with Nitrogen atoms to create the radioactive isotope, Carbon-14. We have both Carbon-...
April 16, 2011
Match each ratio in the first row with an equivalent ratio from the second row if angle A plus angle B = 90 degrees. SinA CosA TanA CscA SecA CotA SinB CosB TanB CscB SecB CotB Does this question even make sense?
April 6, 2011
A coil is made up of 19 square loops with the sides equal to 5.3 cm. The coil is placed in a uniform 350 mT magnetic field with the axis of the coil parallel to the magnetic field. If the field reverses direction in 0.17 seconds, what is in volts, the average emf induced in ...
March 11, 2011
A 3.00 kg block starts from rest at the top of a 30° incline and accelerates uniformly down the incline, moving 1.94 m in 1.70 s. (a) Find the magnitude of the acceleration of the block. (b) Find the coefficient of kinetic friction between the block and the incline. (c) ...
March 10, 2011
A satellite is in a circular orbit around an unknown planet. The satellite has a speed of 1.70 104 m/s, and the radius of the orbit is 5.30 106 m. A second satellite also has a circular orbit around this same planet. The orbit of this second satellite has a radius of 8.70 106 ...
March 4, 2011
A traffic engineer monitors the rate at which cars enter a freeway onramp during rush hour. From her data, she estimates that between 4:30pm and 5:30pm the rate R(t) at which cars enter is given by: R(t)= 100(1-0.00012t^2) car per min., where t is time in min. since 4:30. a. ...
February 15, 2011
Suppose a straight 1.25 mm diameter copper wire could just "float" horizontally in air because of the force of the Earth's magnetic field B, which is horizontal, perpendicular to the wire, and of magnitude 5.00 multiplied by 10-5 T. What current would the wire ...
February 10, 2011
language arts peer edit
The Lightning Thief book and movie are different and same in many ways. The book of the Lightning Thief is more interesting and detailed for most people who read the book and watched the movie. The movie sometimes has things that the book doesnt have and sometimes the ...
February 8, 2011
Is my first paragraph of the essay good? Correct some mistakes. The Lightning Thief book and movie are different and same in many ways. The book of the Lightning Thief is more interesting and detailed for most people who read the book and watched the movie. The movie sometimes...
February 8, 2011
The table provides data on the demand for and the supply of eggs in the United States. At a price of _____________ there would be a surplus. Price (per dozen) $0.50 $1.00 $1.50 $2.00 $2.50 Quantity Demanded 90 80 70 60 50 Quantity Supplied 30 50 70 90 100 Answer Question 9 ...
January 21, 2011
8. A journalist is being compelled to reveal a confidential source of information, but the source would be useful to the government in a criminal investigation, or helpful to a criminal defendant at trial. What constitutional issues are involved? Should the government be able ...
January 19, 2011
Should members of the news media have greater access than the general public to court proceedings and court records? What about greater access to prisons to interview prisoners? What about greater access to police investigative files?
January 19, 2011
Math - D.E.Q.
The half-life of a radioactive isotope is the amount of time it takes for a quantity of radioactive material to decay to one-half of its original amount. i) The half-life of Carbon 14 (C-14) is 5230 years. Determine the decay-rate parameter for C − 14.
January 18, 2011
The position of a ball as its kicked upwards is measured as y(t) =−(4.9 t^2 + 20t + 0.50)m, where t is measured in seconds. Find the vertical component of velocity and acceleration of the ball as a function of time. If the ground is located at yg = 0, ﬁnd the time...
January 12, 2011
The moment of inertia about the pole(origin) of the plane region which is inside the cardiod: r = 1 + cosO and outside the circle r =1. It's mass density is equal to it's distance from the pole..... I need someone who is way smarter than me to help with this one... ...
December 8, 2010
The mass of the solid inside the sphere: x^2+y^2+z^2=1, above the xy plane and below the cone z=SqRT(x^2 + y^2. It's mass density is equal to the square of a distance from the origin, setup in both spherical and cylindrical coordinates. I don't have to evaluate, but i ...
December 8, 2010
Use lagrange multipliers to find the point on the plane x-2y 3z-14=0 that is closet to the origin?(try and minimize the square of the distance of a point (x,y,z) to the origin subject to the constraint that is on the plane) Help me please!
December 7, 2010