Physics, 25.10.2021 22:30 krystalhurst97
Một vật được thả tự do từ độ cao 90m xuống mặt đất. Bỏ qua lực cân bằng không khí. Lấy gia tốc rơi tự do g=10m/s2
a. Tính vận tốc của vật khi chạm đất
b. Tính quãng đường vật rơi trong 2s
c. Tính quãng đường vật rơi trong nửa cuối giây thứ 1
Answers: 1
Physics, 22.06.2019 02:30
Acup of coffee sits on the dashboard of an automobile. the car goes around a sharp curve. even though you hold the cup still, coffee still splashes out. this can best be explained due to a) density. b) friction. c) gravity. d) inertia.
Answers: 2
Physics, 22.06.2019 10:50
Two rigid transformations are used to map δhjk to δlmn. the first is a translation of vertex h to vertex l. what is the second transformation? a reflection across the line containing hk a rotation about point h a reflection across the line containing hj a rotation about point k
Answers: 1
Physics, 22.06.2019 12:30
Awheel of mass 48 kg is lifted to a height of 0.8 m. how much gravitational potential energy is added to the wheel? acceleration due to gravity is g = 9.8 m/s2. a. 30.4 j b. 3.1 j c. 297.9 j d. 11,321 j
Answers: 1
Physics, 22.06.2019 19:00
Review multiple-concept example 7 in this chapter as an aid in solving this problem. in a fast-pitch softball game the pitcher is impressive to watch, as she delivers a pitch by rapidly whirling her arm around so that the ball in her hand moves in a circle. in one instance, the radius of the circle is 0.626 m. at one point on this circle, the ball has an angular acceleration of 66.1 rad/s2 and an angular speed of 12.6 rad/s. (a) find the magnitude of the total acceleration (centripetal plus tangential) of the ball. (b) determine the angle of the total acceleration relative to the radial direction.
Answers: 3
Một vật được thả tự do từ độ cao 90m xuống mặt đất. Bỏ qua lực cân bằng không khí. Lấy gia tốc rơi t...
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