A 2.69-kg drone is flying over a lake. With both the x and y directions horizontal (that is, viewing the drone from above), the drone's velocity changes from (3.26 m/s)i + (0.00 m/s)j to (7.22 m/s)i + (4.67 m/s)j in 6.22 s.

Determine the expected diffraction angle for the first-order reflection from the (310) set of planes for bcc chromium when monochromatic radiation of wavelength 0.0735 nm is used. the atomic radius for cr is 0.1249 nm.

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Ahot-air balloon takes off from the ground traveling vertically with a constant upward acceleration of magnitude g/4. after time interval δt, a crew member releases a ballast sandbag from the basket attached to the balloon. how many seconds does it take the sandbag to reach the ground? (express your answer in terms of δt)