Answer:
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Explanation:
Answer:
B
Explanation:
Resolve the 75N force into 2 components; horizontal and vertical. And remember that there is no acceleration in the downward direction, so apply Newton's second law and equate it to 0.
Answer:
Mechanical advantage = 3
Explanation:
Mechanical advantage, MA = Output force/Input force
Output force = 15 N. Input force = 5 N
MA = Output force/Input force = 15 N/ 5 N = 3
On the dog's return trip (between <em>t</em> = 10 and <em>t</em> = 12.5 seconds), the slope of the position function is steeper than during the first 5 seconds, which means the dog ran home faster. The only option that captures this is D.
You can check to make sure that the dog indeed runs twice as fast on the return trip. The slope of the position function during the first 5 seconds is
(change in position) / (change in time) = (5 - 0) / (5 - 0) = 5/5 = 1
while during the return trip, it is
(0 - 5) / (12.5 - 10) = -5/2.5 = -2
Ignoring the sign (which only indicates the direction in which the dog was running), we see that the dog's speed on the return trip was indeed twice as high as during the first 5 s.
As nouns the difference between magnet and lodestone
is that magnet is a piece of material that attracts some metals by magnetism while lodestone is a naturally occurring magnet.
