A figure skater begins spinning counterclock-
1 answer:
Answer:
The average angular acceleration of the skater is <u>0.98 rad/s²</u>.
Explanation:
Given:
Initial angular speed of the skater is,
Final angular speed of the skater is,
Time interval for the change is,
We know that, average angular acceleration is given as the ratio of change of angular speed and the time interval.
Therefore, the average angular acceleration is given as:
Hence, the average angular acceleration of the skater is 0.98 rad/s².
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<h2>Answer:</h2>
1.8 x 10⁻⁵J
<h2>Explanation:</h2>The energy (E) stored in a capacitor of capacitance, C, when a voltage, V, is supplied is given by;
E = x C x V² -------------------(i)
Now, from the question;
C = 2.00μF = 2.00 x 10⁻⁶F
V = 18.0V
Substitute these values into equation (i) as follows;
E = x 2.00 x 10⁻⁶ x 18.0
E = 1.8 x 10⁻⁵J
Therefore, the quantity of energy stored in the capacitor is 1.8 x 10⁻⁵J
Answer:
Energy needed = 1100 kJ
Explanation:
Energy needed = Change in kinetic energy
Initial velocity = 15 m/s
Mass, m = 1600 kg
Final velocity = 40 m/s
Energy needed = Change in kinetic energy = 1280000-180000 = 1100000J
Energy needed = 1100 kJ