Graph for a girl on a cycle ride is sh
de ride is shom
014/
questions
1 the distance-time graph for a gir
in figure 3.5.
a how far did she travel?
b how long did she take?
c what was her average speed in km/h)
d how many stops did she make?
e how long did she stop for altogether
f what was her average speed excludin
g how can you tell from the shape of th
when she travelled fastest? over which
this happen?
2
eed excluding stops?
e shape of the graph
test? over which stage did
distance/km
bc
1pm 2pm
time of
3pm 4pm spm 6pm day
figure 3.5

Clothing made of several thin layers of fabric with trapped air in between, often called ski clothing, is commonly used in cold climates because it is light, fashionable, and a very effective thermal insulator. so it is no surprise that such clothing has largely replaced thickand heavy old-fashioned coats. (a) consider a jacket made of five layers of 0.1-mm-thick synthetic fabric (k = 0.13 w/m·°c) with 1.5-mm-thick air space (k = 0.026 w/m·°c) between the layers. assuming the inner surface temperature of the jacket to be 28°c and the surface area to be 1.25 m2, determine the rate of heat loss through the jacket when the temperature of the outdoors is 0°c and the heat transfer coefficient at the outer surface is 25 w/m2·°c. (b) what would your response be if the jacket is made of a single layer of 0.5-mm-thick synthetic fabric? what should be the thickness of a wool fabric (k = 0.035 w/m·°c) if the person is to achieve the same level of thermal comfort wearing a thick wool coat instead of a five-layer ski jacket?

Which of the following are used in an electrochemical cell? a. electrodes b. electrolyte c. terminals d. all of the above

You hang a book bag on a spring scale and place the bag on a platform scale so that the platform scale reads 23.7n and the spring scale reads 13.8n. what is the magnitude of the force that earth exerts on the bag?