Bắt đầu từ trạng thái nghỉ, một DVD tăng tốc đều đến 450 vòng/phút trong 1 s, quay với tốc độ góc này trong 3 s, sau đó giảm đều xuống đến khi dừng lại trong 2 s. Xác định số vòng quay của đĩa DVD?

Using a wheel and axle, a farmer is trying to lift a bucket of water from the bottom of a well. the larger wheel has a radius of 40 cm compared to the axle that has a radius of 10 cm. if a bucket of water is 50 n, then how much effort is required to raise it? 12.5 n 200 n 2 n 500 n

Explain the comparisons between nature and packingtown that appears on pages 81 and 82 answer

Aracecar driver has to hold on tightly when going around a banked curve. approximately what is the centripetal force on a 2220.0 kg car going around a circle with a diameter of 190.0 meters at 25.0 m/s?