Cho phương trình chuyển động 2t^3-4t+6. Sau 2 giây đầu vật đến điểm M, và đến N mất 3 giây. Tìm vận tốc trung bình quãng đường MN, gia tốc trung bình quãng đường MN Tìm vận tốc, gia tốc tại thời gian là 7 giây

Animals respond in various ways to stimuli detected through their senses. some of these responses are stimulated by the presence of danger. which of these animal responses is the best example of a response to an immediate threat? a) a rooster crows every morning at the first sign of light. b) as something approaches an octopus, it shoots a cloud of ink. c) from late fall until spring, bears hibernate to preserve energy. reactivate d) a dog is getting hot in the sunlight, so he moves to a shaded area.

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What is the energy of a photon of ultraviolet radiation with a frequency of 4.4 × 1015 hz? planck’s constant is 6.63 × 10–34