A boat travels from south bank to north bank of a river. Maximum speed of boat in still water is
8 km/hr. The river is flowing at a rate of 4 km/hr.
To arrive at a point opposite to the point of start,
the boat should start at an angle :-
(1) tan-' (1/2) W of N
(2) tan-' (1/2) N of W
(3) 30° W of N
(4) 30° N of W

Suppose you have a box. which of these is not necessarily a true statement regarding the relationship between the force applied to the box, the work done on the box, and the distance the box is moved? a. if the box is not moved, no force is being applied to the box. b. if no force is applied to the box, no work is done on the box. c. if work is done on the box, then a force is applied to the box. d. if work is done on the box, then the box is moved a distance.

Positrons are spontaneously emitted from the nuclei of

A5 foot by 5 foot box culvert is buried 6 feet beneath the surface of the ground. a crosssection of this very long culvert (into and out of the page) is illustrated below. assume that the soil in which the culvert is buried has the following properties: jt = 120 pcf, w = 12%, ko = 0.50, ka = 0.33, and kp = 3.00. calculate the total horizontal force per unit length of culvert (fh) felt on one of the vertical faces of the culvert.