Recent content by kitkat

I am really stuck on this problem. What evidence supports the notion that light has wave properties? What evidence supports the view that light has particle properties? I know that the Quantum theory tells us that both light and matter consists of tiny particles which have wavelike...

why does the burning of different materials often produce flames of different colors? I know that various colors of flames are due to excitation...but how is that applied here? Kat

It was set up wrong! I figured it out! The problem should be set up like so: (100g) (1.0 cal/g Co ) (Tf- 25 degrees) + (75g) (1.0 cal/g Co) (40 degrees - Tf) = 0 Resulting in this: 100Tf – 2500 + 75Tf – 3000 = 0 175Tf = 2500 + 3000 175Tf = 5500 175Tf/175 = 5500/175 Tf = 31.4 I...

i guess so I guess I need to be hit in the head with a hammer cause I just can't "see" it. My teacher gave me the following formula (100g) (1.0 cal/g C) (Tf -25) = (75g) (1.0 cal/g C)(40 degrees - Tf) and I just can't see first what the heck Tf stands for, where the 1.0 cal came from an...

I am stuck on this problem... What would be the final temperature when 100 g of 25 degree C water is mixed with 75 g of 40 degree C water? I know that mc?T gained = mc? T lost so (100g) (1.0 cal/g C) (Tf -25) = (75g) (1.0 cal/g C)(40 degrees - Tf) Where do I go from here? any push...

thank you its nice to know that I understood it at least...I kept working the problem and came up with 5m/s^2 as well...again thank you from the help. Kat

strange... the book uses 50kgs as well... now I am really confused.

I see your point... I think you are right, I see myself forgetting to put the labels in so its good advice..Could I trouble you to look at another problem...this problem and answer was given by the teacher to use as an example but I am having trouble figuring it out still. Here is the...

I am taking a conceptual physics class online and the testbook doesn't seem very clear to me (or maybe its because my kids have all the science genes in my family) The question is this: What is the acceleration of a 40-kg block of cement when pulled sideways with a net force of 200N? Here...