A student drops a rubber ball onto a surface. Assume that this is a closed system. The ball bounces, but each successive bounce
is shorter than the one before it. Eventually, the ball comes to a stop. Which statement provides evidence that supports the idea that energy is conserved in this closed system?
A. The ball moves through air, suggesting that the ball has mechanical energy.
B. The ball needs a push or pull to start moving, suggesting it needs a constant input of energy.
C. The ball makes a sound with each bounce, suggesting that some kinetic energy transformed into sound.
D. The ball bounces many times, suggesting the energy is used up efficiently
A. The ball moves through air, suggesting that the ball has mechanical energy.
B. The ball needs a push or pull to start moving, suggesting it needs a constant input of energy.
C. The ball makes a sound with each bounce, suggesting that some kinetic energy transformed into sound.
D. The ball bounces many times, suggesting the energy is used up efficiently
2 answers:
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Answer
given,
mass of ball = 5.93 kg
length of the string = 2.35 m
revolve with velocity of 4.75 m/s
acceleration due to gravity = 9.81 m/s²
T cos θ = mg
T cos θ =
T cos θ = 58.17
T² - 56.93T - 3383.75 = 0
T = 93.22 N
θ = 51.39°
Answer:
Current, I = 1000 A
Explanation:
It is given that,
Length of the copper wire, l = 7300 m
Resistance of copper line, R = 10 ohms
Magnetic field, B = 0.1 T
Resistivity,
We need to find the current flowing the copper wire. Firstly, we need to find the radius of he power line using physical dimensions as :
r = 0.00199 m
or
The magnetic field on a current carrying wire is given by :
I = 1000 A
So, the current of 1000 A is flowing through the copper wire. Hence, this is the required solution.