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Q. Laser light with a wavelength = 680 illuminates a pair of slits at normal incidence.What slit separation will produce first-order maxima at angles of 40 from the incident direction?

Q. A 32.0- packing case is initially at rest on the floor of a 1620- pickup truck. The coefficient of static friction between the case and the truck floor is 0.30, and the coefficient of kinetic friction is 0.20. Before each acceleration given below, the truck is traveling due north at constant speed.

Find the magnitude of the friction force acting on the case when the truck accelerates at 2.48 northward.

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