Tag Archives: science

Chemistry Specific Heat Problems

chemistry specific heat problems
chemistry specific heat?

im going over some chemistry problems before school starts back, but i dont understand this specific heat problem…need help.

a sample of metal with a mass 250g is heated to 130 degrees C and dropped into 425g of water at 26 degrees C. The final temperature of the water is 38.4 degress C. What is the specific heat capacity of the metal if 1.2 x 10 ^3 J are lost to the environment?

PLEASE AND THANK YOU!

q (water) = 425 g x 4.18J x ( 38.4 – 26) = 2.20 x 10^4 J
2.20 x 10^4 – 1.2 x10^3 = 2.08 x 10^4
q ( metal ) = – 2.08 x 10^4 J
q ( metal) = 250 g x specific heat x ( 38.4- 130 ) =
– 2.08 x 10^4
specific heat = 0.908 J / g °C

Specific Heat

Heat Projectiles

heat projectiles
Physics Roller Coaster Loop, projectile motion, and heat help!?

Does a roller coaster loop demonstrate circular motion? If so, why and what is the equation? What is the equation for projectile motion? What is the equation for heat, is it something like average temperature = (g)(c)(degrees)?

Thanks!!

There isn’t one single formula for circular motion
or for projectile motion
or for heat

Physics would take about 10 minutes to learn if there were.

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Pool Chemicals Bulk

pool chemicals bulk
How much does bulk water cost? and other pool questions?

I am looking to lease a home with an in ground pool and I would like some advice from pool owners. How much per gallon did you pay for your bulk water, I know it fluctuates depending on region, I’m in the midwest, but Id like an idea of what others pay. Also do you hire a company to do the weekly maintenance or do you do the chemicals yourself, which do you find to be more cost effective? Any other advice for keeping pool maintenance costs down are appreciated.

In Southern Arizona, bulk water delivery is charged at a penny a gallon and $95 per hour for the water truck. The last pool I designed and had to be filled that way ended up running around $850 for 13,000 gallons.

It is always cheaper to do it yourself, but you have to be honest with yourself as to whether or not you feel like you can keep on top of the maintenance. If you ‘let the pool go’ and let the chemistry get out of whack, you can damage the equipment or the interior surface, which cost a heck of a lot more than pool service.

Again, using southern AZ as a guide, you can expect to pay from $50-$125 per month on a service, which includes chemicals. The variance in price is because some services are water chemistry only, and do not perform other maintenance services like cleaning filters, salt cels (if you have one) and so on.

Maintaining a pool is a lot like maintaining a car – you can skip oil changes and not check the air pressure in the tires and save a little, or you can buy tires more often and replace the engine at 60,000 miles.