Calculate the mass of ice that would melt when 2kg of copper is quickly transferred from 15 boiling water to a block of ice without heat loss
Specific heat capacity of copper = 400JKgK
Latent heat of fusion of ice = 3.3 x 10 JKg
A. 8/33kg
B. 33/80kg
C. 80/33kg
D. 33/8kg

Aperson walking 1 mile everyday for exercise, leaving her front porch at 9: 00 am and returning to her front porch at 9: 25 am. what is the total displacement of her daily walk? a) 1 mileb) 0c) 25 minutes d) none of the above

30 points - when can a theory be modified if a new type of technology allows for new observations that raise new questions? a. immediately, while the questions about the theory are being asked b. after new hypotheses related to the theory are tested in experiments c. only after the new observations disprove all parts of the theory d. while scientists begin to think about how the theory could improve

Explain why electric current cannot exist if a current doesn't have a voltage source.