Answer:
option (c) - 10 j
Explanation:
F = (6 i + 4 j - 2 k) N
r1 = (1.5, 3, -4.5) m = (1.5 i + 3j - 4.5 k) m
r2 = (4, -2.5, - 3) m = (4 i - 2.5 j - 3 k) m
displacement, r = r2 - r1 = ( 2.5 i - 5.5 j + 1.5 k) m
Work done is defined as the dot product of force vector and teh displacement vector.
W = (6 i + 4 j - 2 k) . ( 2.5 i - 5.5 j + 1.5 k)
W = 15 - 22 - 3 = - 10 J
Acceleration=Final velocity-Initial velocity /time.
Acceleration=a=4m/s².
Initial velocity= u= 44m/s
Final velocity=v= let it be v, since we are to look for the final velocity.
Time=t=10seconds.
Mathematically:
a=v-u/t
Substituting the givens into the equation.
4=v-44/10
cross multiply.
4×10 = v-44
40=v-44
40+44=v
v=84m/s
Answer:
-40°C and -273°C ok do it
A) 330 N
Explanation: Her weight must be evenly distributed between the chains (assuming they are at an even level), so you divide 660 by 2 and get 330
Answer: the answer should be 6,720 decameters.
