Question

100g of water = ?? gram of ice?
Anyone helps me ,please

Answer 1

@jdoe0001

Answer 2

Are you trying to say at when melts?

Answer 3

nope, just this condition
I have 100g of \(0^0 C\) of water and I want to know it is = ?? g of \(0^0 C\) of ice

Answer 4

it's the same, mass can't be lost

Answer 5

thanks @aaronq

Answer 6

no probs

Answer 7

Mass is the same, density is different

Answer 8

when you blow to your hands to warm them, the energy transfer is radiation, right?

Answer 9

It has to be convection, because you are moving air

Answer 10

I need more!! what is the mode of energy transfer into your sealed car parked in the sun on a hot summer day? is it convection?

Answer 11

It is conduction because energy transfer is occurring between the outside to the inside through the surface. It feels even hotter inside because the are can not escape and heats up more than any cubic meter outside, where the heat can disperse more readily.

Answer 12

*air not are

Answer 13

is it not that conduction happens when 2 things connect to each other, one is hot and one is cold. The heat transfers from the hot thing to the cold thing?
and convection is the moving of the air and makes it move around the environment?

Answer 14

That is true. Conduction is here for the car is between the hot external air and the air inside the car.

Answer 15

how much heat does it take to bring a 3.4kg iron skillet from 20 C to 130 C?
Q = mc \(\triangle T\) with c = 447
am I right ?

Answer 16

Yes, I believe that is the the correct equation

Answer 17

Isn't c=0.447 for iron? http://www.engineeringtoolbox.com/specific-heat-metals-d_152.html

Answer 18

if the heat is supplied by a stove burner at the rate of 2.0kW, how long will it take to heat the pan
I apply H = dQ/dt

Answer 19

but not sure

Answer 20

How do you know when the pan is "heated"? Is it when there is not increase in temperature?

Answer 21

hey, for c (iron) your table gives kj, my book gives j

Answer 22

about the question, what can I solve?

Answer 23

I know that kW is kJ/s so this is the rate of heat transfer per unit time and we also know that it is "heated" when change in temperature is zero? Not sure about next step though.

Answer 24

ok, let me ask my prof tomorrow. :)