According to the theory of global warming, the average temperature of Earth’s air began rising rapidly when humans first started
burning fuels such as oil. Burning these fuels releases carbon dioxide into the air. Scientists have observed that carbon dioxide traps heat from the Sun in Earth’s atmosphere. They have also observed ice melting in some areas.
Which part of the scientific cycle does the graph directly represent?
A.experiments
B.xplanations
C.questions
D.facts
Which part of the scientific cycle does the graph directly represent?
A.experiments
B.xplanations
C.questions
D.facts
2 answers:
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The work done by the machine is equal to the product between the force applied and the distance over which the force is applieds, so in this case:
And the power of the machine is equal to the ratio between the work done by the machine and the time taken:
And the power of the machine is equal to the ratio between the work done by the machine and the time taken:
Answer:
F=12.5N
Explanation:
Net force = rate of change of momentum
so find the change of momentum P
Pdown
Pup
dP = change in P
so