A dog of mass 10 kg sits on a skateboard of mass 2 kg that is initially traveling south at 2 m/s. The dog jumps off with a veloc
1 answer:
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Answer:
.
Explanation:
Let and
denote the velocity of this hockey player before and after stopping, respectively. The question states that
and implies that
since the hockey player has come to a stop.
The duration of this acceleration is .
Since the acceleration of this hockey player was constant, SUVAT equation would apply. In particular, the SUVAT equation gives the displacement
of this hockey player during that
of acceleration:
.
In other words, this hockey player would have travelled while stopping.
Answer:
1.117935:1
Explanation:
Since the wires are of the same material, they will have the same resistivity .
The cross-sectional area of the of a wire is given by;
where d is the diameter of the wire.
Also, the relationship between resistance R, cross-sectional area A and length l of a wire is given as follows;
Since the resistivity same for both wires, say wire 1 and wire 2, we can wreite the following;
Hence from eqaution (3), the ration of wire 1 to 2 is expressed as;
Given;
We then use equation (1) to fine the ratio of the area to
bearing in mind that
This ratio gives 0.8281. Substituting this into equation (5), we get the following;