: Một thang máy chuyển động lên cao với gia tốc không đổi 2 m/s2 . Lúc thang máy có tốc độ 2,4
m/s thì từ trần thang máy có một vật rơi xuống. Trần thang máy cách sàn h = 2,55 m. Lấy g = 10 m/s2
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Thời gian rơi của vật là

If a refrigerator is a heat pump that follows the first law of thermodynamics, how much heat was removed from food inside of the refrigerator if it released 380j of energy to the room?

You are driving directly behind a pickup truck, going at the same speed as the truck. a crate falls from the bed of the truck to the road. (a) will your car hit the crate before the crate hits the road if you neither brake nor swerve? (b) during the fall, is the horizontal speed of the crate more than, less than, or the same as that of the truck?

Engineers find a new metal that is stronger than steel but much lighter. this material is also significantly cheaper than what is currently used for most aircraft, available in large quantities, and easy to manufacture. the engineers are excited because this new material will lower the costs of buying and operating airplanes for companies. what is probably the best step for the engineers to make next?