Answer:
619.8 N
Explanation:
The tension in the string provides the centripetal force that keeps the rock in circular motion, so we can write:
where
T is the tension
m is the mass of the rock
v is the speed
r is the radius of the circular path
At the beginning,
T = 50.4 N
v = 21.1 m/s
r = 2.51 m
So we can use the equation to find the mass of the rock:
Later, the radius of the string is decreased to
r' = 1.22 m
While the speed is increased to
v' = 51.6 m/s
Substituting these new data into the equation, we find the tension at which the string breaks:
I think they are right! When one of the answers is, all of the above, that is usually the correct answer. pH is important to all living things.
The resistance of the conductor is 0.07940 Ohms.
<h3>What is the relation between resistance and area of wire?</h3>
The wire's resistance is inversely related to its cross-sectional area; as the area drops, so does the resistance.
and it is formulated as:
where,
<em>p </em>- resistivity of the conductor (0.0214-ohm mm²/m)
R - resistance
l- length of conductor (50 feet) (15.24 m)
s - the area of the wire
Thus the resistance can be calculated as
R = 0.07940 Ohms.
Learn more about resistance here:
brainly.com/question/11431009
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points!
Answer:
the diver's speed just before she enters the water is 8.718 m/s.
Explanation:
Given;
height of the diving platform, h = 3.8 m
initial velocity of the diver, u = 1.24 m/s
the diver's speed just before she enters the water is her final velocity, = v
Apply the following kinematic equation to determine the final velocity of the girl;
v² = u² + 2gh
v² = (1.24)² + 2(9.8 x 3.8)
v² = 76.018
v = √76.018
v = 8.718 m/s
Therefore, the diver's speed just before she enters the water is 8.718 m/s.
