Answer:
For any v-t graph the acceleration is the slope of the graph. For average acceleration in a time period ‘t’ consider the change in velocity in time t and divide it by the time t. For instantaneous acceleration you need to go into the realm of differential calculus.
Explanation:
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Answer:
<em>d. She will be slightly lower than you but moving upward toward you</em>.
Explanation:
Since your swing is slightly shorter than your friend's swing, then you will have more angular speed than your friend. Angular speed increases with a decrease in radius. The closer the body is to the center, the faster the body swings. By the time you would have completed one complete swing back and forth, your friend will just be moving towards you, and she will be slightly lower than you but moving upwards towards you. This principle is the same reason gymnasts pull their limbs closer to their body when they need to swing faster.
Answer:
b. He has to apply less force to lift the box because the mass has decreased.
Explanation: i just took a ck12 test and it was right lol
Explanation:
1 mile = 1609m
Distance=260 miles= 418340 m
Speed= 40 m/s
Time = distance/speed
= 418340/40
=10458.5 seconds
= 2.9 hours
Answer:
<em>At t=T/2 the angular speed equals to its average angular speed </em>
Explanation:
<u>Angular Motion</u>
Let w be the angular speed of a rotating object, its angular acceleration, and T the time the acceleration is acting upon the object. The basic formula for the angular motion is
We are told the initial speed is zero, so
The average angular speed from t=0 to t=T can be found by
This value is reached at a certain time we need to compute, knowing that
Or equivalently
Simplifying we have
At t=T/2 the angular speed equals to its average angular speed