In which of the following simple machines is the effort applied between the load and the fulcrum?
Scissors
Pliers
Wheel barrow
Sugar tongs
Nutcrackers
Correct answer is D
No explanation has been provided for this answer.
20m
40√3m/3
20√3m
40√3m
60cm
Correct answer is B
\(\tan 30 = \frac{x}{40}\)
\(x = 40 \tan 30 = \frac{40}{\sqrt{3}}\)
= \(\frac{40\sqrt{3}}{3} m\)
Which of the following processes is not involved in the carbon cycle?
Burning
Decay
Transpiration
Respiration
Photosynthesis
Correct answer is C
No explanation has been provided for this answer.
Changes in energy flow between organisms in a habitat can be represented by the
pyramid of biomass
pyramid of numbers
energy pyramid
food chain
food web
Correct answer is C
No explanation has been provided for this answer.
If sin x = 12/13, where 0° < x < 90°, find the value of 1 - cos\(^2\)x
25/169
64/169
105/169
144/169
8/13
Correct answer is D
\(\sin x = \frac{12}{13}\)
\(\cos x = \frac{5}{13}\)
\(\cos^{2} x = (\frac{5}{13})^2 = \frac{25}{169}\)
\(1 - \cos^{2} x = 1 - \frac{25}{169}\)
= \(\frac{144}{169}\)
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