Answer:
Explanation:
Assuming statics
The average force is (60 + 0) / 2 = 30 N
E = Fd = 30(0.005) = 0.15 J
or
k = F/d = 60/0.005 = 12000 N/m
E = ½kx² = ½(12000)0.005² = 0.15 J
Answer:
1
Explanation:
The ratio of their nuclear densities is 1, as nuclear density is constant for all nuclei.
We have the relation
where denotes the velocity of a body A relative to another body B; here I use B for boat, E for Earth, and R for river.
We're given speeds
Let's assume the river flows South-to-North, so that
and let be the angle made by the boat relative to East (i.e. -90° corresponds to due South, 0° to due East, and +90° to due North), so that
Then the velocity of the boat relative to the Earth is
The crossing is 153.0 m wide, so that for some time we have
which is minimized when so the crossing takes the minimum 30.0 s when the boat is pointing due East.
It follows that
The boat's position at time is
so that after 30.0 s, the boat's final position on the other side of the river is
and the boat would have traveled a total distance of
The answer is D) Gravity is dependent on mass and strong nuclear force is not.
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