Please explain why 76,77,78,and 79 are true (they are all short and quick thanks
ID: 1660887 • Letter: P
Question
Please explain why 76,77,78,and 79 are true (they are all short and quick thanks )
. 935.2 km 76. The friction force which acts on the body siding on a horizontal table does NOT depend on: A. body mass friction coefficient C. body geometry gravitational accelaration g E. None of these 77. Paraglider flies from west to east. If wind blows from south to north his speed A. increases. decreases. C: is the same as if there was no wind. Need more information. E. Drops to zero. A box is sliding in direction A. If the total force starts acting on the box in the direction B, opposite to the direction A, the box will A. speed up B. not feel the action of that force. 78. retain the same speed. slow down, change the direction and then speed up going in the other way. E. retain the same speed, but change the direction 79. Suppose that the number of neutrons in a reactor doubles each second, reaching 5.368709120 x 10 neutrons in 30 seconds. How many neutrons were at the beginning? A. 20 B. 160 C. 2560 1280Explanation / Answer
76. Frictional force is independent of area of contacts. Frictional force is independent as nature of surface in contact.
77. The paraglider has to flow only in the east west direction so it doesn't matter if the wind flows in north south direction.
78. When the force acts in the opposite direction, it starts to retard so its velocity decreases and it stops and then continues to accelerate in the opposite direction.
79. It forms a series x(1+2+4+....30 terms)= The given number.
It is a GP with a=1, r=2, n=30.
Sum= 230-1.