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Answer to Question #4447 in Mechanics | Relativity for Jordan

Question #4447
An object is on a van's windshield that's inclined 30 degrees to the vertical. To what acceleration must the van move in order to keep the object there, neglecting all frictional forces including drag?
Expert's answer
[img width=242,height=210]file:///C:/Users/Sekventa/AppData/Local/Temp/OICE_B2309807-6412-4640-ABE8-66F01E899734.0/msohtmlclip1/01/clip_image002.jpg[/img]
data:image/png;base64,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N=T
Mg*cos30=ma*sin30
a=g*ctg30=[img width=18,height=22]file:///C:/Users/Sekventa/AppData/Local/Temp/OICE_B2309807-6412-4640-ABE8-66F01E899734.0/msohtmlclip1/01/clip_image004.gif[/img]g
a-accelaretion ofvan

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