Answer:
Organisms that use energy from the sun to make their own food are called autotrophs
Explanation:
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When we have two sound waves with frequencies f1 and f2 that interfere, the beat frequency is equal to the absolute value of the difference of the two frequencies, so in our problem:
Answer:
Work is done by the heart on the blood during this time is 0.04 J
Explanation:
Given :
Mass of blood pumped, m = 80 g = 0.08 kg
Initial speed of the blood, u = 0 m/s
Final speed of the blood, v = 1 m/s
Initial kinetic energy of blood is determine by the relation:

Final kinetic energy of blood is determine by the relation:

Applying work-energy theorem,
Work done = Change in kinetic energy
W = E₂ - E₁

Substitute the suitable values in the above equation.

W = 0.04 J