Kaylee dawn arnold
physical science sol test 2009
a student suspects that there is a relationship between the amount of sunny weather in a given state and
the amount of solar energy used by its inhabitants. in order to find out if this idea is correct, the student will
need which information for each state?
o a the number of sunny days per year and the amount of solar power used per year
o
b
the efficiency of solar technology used in that state
x
o c the location and type of solar cells used in that state
od the percentage of days that have enough sunlight to power a solar water heater

Answersystem;

We can infer that star y is closer but other factors must be considered include the heat of the star, the mass, and the brightness of the star. even though star x seems dimmer it may just be less bright or contains less heat.

Distance covered = speed x timethe distance traveled going against the stream = distance traveled with the stream.therefore it is the speed and the time that are the variables.as he travels the same distance both ways, speed x time is the same for each way.going upstream his speed is 4 kph; going downstream his speed is 6 kph.therefore we have two simultaneous equations: time upstream x 4 = time downstream x 6time upstream + time downstream = 60 minutestherefore we have the equation: time upstream = 6/10 hour, time downstream therefore = 4/10 hour.distance traveled at 4km/hr in 6/10 hour = 24/10 = 2.4km.check: distance traveled at 6km/hr in 4/10 hour = 24/10 = 2.4km.