Applied Mechanics and Graphic Statics
Two shots fired simultaneously from the top and bottom of a vertical tower with elevations of 30° and 45° respectively strike a target simultaneously. If horizontal distance of the target from the tower is 1000 m, the height of the tower is

400 m
425 m
375 m
350 m

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Applied Mechanics and Graphic Statics
The following is not a law of static friction:

The magnitude of the limiting friction bears a constant ratio to the normal reaction between two surfaces
The force of friction depends upon the roughness of the surface
The force of friction is dependent upon the area of contact
The force of friction always acts in a direction opposite to that in which the body tends to move

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