# Physics

posted by .

A doctor uses an insulated backpack to “hike in” vaccines to a rural village in Papua New Guinea that is too remote for vehicular traffic. The vaccines are kept cold by packing them in 10 kg of ice. If the backpack absorbs heat (leaks cold) at a rate of 12 J/s, how long will it be before the last of the ice melts?

• Physics -

Allow enough time (t) for the absorbed heat to equal the heat necessary to melt 10 kg of ice.

(12 J/s) * t = (10,000 g)*(80 Cal/g)*4.184 J/Cal

Solve for t, in seconds

## Similar Questions

1. ### Biology 20

explain how vaccines help in combating diseases.
2. ### world geography

new zealand and papua new guinea have: A)huge manufactoring industries B)lush, tropical climates that produces many kind of tropical fruit C)**valuable timber resources D)very limited timber resources and poor soil.
3. ### science

Mr.wilinson carried his backpack 12kilometers and set up camp on the edge of cutthroat lake it took him 3 hours to get there from the trailhead how much work did he do on his backpack on the hike in?
4. ### bio

how do you think the development of vaccines for more than 20 communicable diseases has affected the average human life span in areas where these vaccines are available?
5. ### biology

why aren’t there vaccines for every disease?
6. ### science

explain how vaccines prevent infection
7. ### physics

You take your backpack out of the car, hike to the top of a nearby mountain, and return with your backpack to your car at the bottom. Have you changed the amount of your backpack's mechanical energy?
8. ### world geography

new zealand and papua new guinea have: a. huge manufacturing b. lush, tropical climates that produce many kinds of tropical fruit c. valuable timber resources d. very limited timber resources" is pending help i cant find the answer
9. ### University of Papua New Guinea

Give equations with reaction conditions to show direct esterification methods for the production of A) isopropyl butanoate B) ethyl- 2-methylpropanoate
10. ### geography

New Zealand and Papua New Guinea have a. huge manufacturing industries. b. lush, tropical climates that produce many kinds of tropical fruit. c. valuable timber resources. d. very limited timber resources and poor soil.

More Similar Questions