Question:
What quantity do units represent in a value? A. Size B. Direction C. Magnitude D. Dimension
Answer:
D. Dimension
Explanation:
A unit is simply the measurement given to a dimension. In other words, units represent dimensions. For example, consider a ruler that is 20m long.
i. The value is 20m.
ii. The magnitude of the measurement is 20
iii. The unit of the measurement is meters(m) and that essentially represents the dimension (length) of the ruler.
Let be the distance between the base of the ladder and the bottom of the wall, and the distance between the top of the ladder and the bottom of the wall, so that
Differentiate both sides with respect to time :
When , the top of the ladder is
above the ground. Then, given that the bottom of the ladder slides away from the wall at a rate of , we have
That is, the top of the ladder is sliding downward at a rate of 0.24 ft/s.
3.11 is the answer I think
Answer:
F =1490.9 N
Explanation:
given,
work done = 82 J
compression length = 0.220 m
for parallel combination
= 2 k
work done
force =
F = kx
F = 3388.43 ×0.22
F =745.45 N
the additional work done
final potential energy =
= 4 W = 328 J
the additional work = 328 - 82 = 255 J
maximum force
F = k × 2x
F = 2×745.45
F =1490.9 N
Answer:
570 N
Explanation:
Friction = normal force × coefficient of friction
F = Nμ
71.2 = N (0.125)
N = 569.6
Rounded to 3 significant figures, the normal force is 570. N.