Roughness and smoothness of the sliding object and/or shape/design of the object
The answer would be slow cooling
Answer:
Explanation:
Work is defined as the scalar product of force and distance
W=F•d
Given that
F = 8.5i + -8.5j. +×-=-
F=8.5i-8.5j
d = 2.5i + cj
If the work in the practice is zero, then W=0
therefore,
W=F•ds
0=F•ds
0=(8.5i -8.5j)•(2.5i + cj)
Note that
i.i=j.j=k.k=1
i.j=j.i=k.i=i.k=j.k=k.j=0
So applying this
0=(8.5i -8.5j)•(2.5i + cj)
0= (8.5×2.5i.i + 8.5×ci.j -8.5×2.5j.i-8.5×cj.j)
0=21.25-8.5c
Therefore,
8.5c=21.25
c=21.25/8.5
c=2.5
Answer:
#See solution for details.
Explanation:
-An electromagnet's field can be rapidly changed by just controlling the amount of current. The magnetic strength can be varied over time.
-This way, only a sufficient amount of current will be supplied to meet the needs.
-Unlike the electromagnet, the permanent magnet has a fixed magnetic strength and can only lift a specified weight.
Anything above because the first part of the answers have less mass then the second part
