The radio waves used to communicate with astronauts in space must be ___________ frequency waves
Fill in the blank(s) with correct word
high
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____________ is the closest planet to the Sun
Fill in the blank(s) with correct word
Does the growth of a leaf violate the law of entropy, and why or why not?
A) No, because the leaf actually increases its own entropy in this process, despite the appearance that it is becoming better organized. B) No, because the increase in the entropy of the radiation passing through the leaf is greater than the decrease in the entropy of the leaf itself. C) No, because the energy increase of the leaf is exactly balanced by the energy decrease of the radiation flowing through the leaf. D) Yes, because this law is violated in situations involving energy from the sun. E) Yes, because this law is violated by living organisms.
A metallic sphere A of radius 1 cm with charge 450 nC hangs on an insulating thread inside an uncharged thin metallic spherical shell B of radius 2 cm. Next, A is made temporarily to touch the inner surface of B. How is the charge then shared between them?
A block (mass = 4.0 kg) sliding on a horizontal frictionless surface is attached to one end of a horizontal spring (k = 100 N/m) which has its other end fixed. If the maximum distance the block slides from the equilibrium position is equal to 20 cm, what is the speed of the block at an instant when it is a distance of 16 cm from the equilibrium position?
a. 71 cm/s b. 60 cm/s c. 80 cm/s d. 87 cm/s e. 57 cm/s