Answer:
39.0 N
Explanation:
Since the rock is in uniform circular motion, the tension in the string provides the centripetal force required to keep the rock in circular motion.
So we can write:
where
T is the tension in the string
m = 0.35 kg is the mass of the rock
r = 1.25 m is the radius of the circle (the length of the string)
is the angular velocity of the rock
Here the rock covers 1 revolution in a time of
t = 0.665 s
1 revolution corresponds to an angle of rad, so the angular velocity is:
Therefore substituting into the previous equation, we can find the centripetal force, which is the tension in the string:
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Answer:
Explanation:
In physics the term velocity is always a vector. All that means is that it's got a direction with it. which also means this vehicle that was traveling in the east direction and then turned left is and is now , maybe traveling in a north direction. Making the guesses that the car was traveling due East and is now traveling due North, then the car has changed it's velocity by 40 m/s. By The Way do you happen to know how fast 40 m/s is? it's about 144 Kph :0 or about 90 MPH so this guy is also speeding :D, write him a ticket ... :P
The triangle before the x means "change in x" which is: (finalx - initialx)
So if the interval is 1 sec to 3 sec, change in t would be 3-1=2 sec. The corresponding x-values are 30-10=20
change in x / change in t = (30-10)/(3-1) = 10 m/s