Answer:
<em>10.44° per sec</em>
Explanation:
Initial angular speed N = 2 rotations per minute
converting to rad/s ω = 2πN/60 = (2 x 3.142 x 2)/60 = 0.21 rad/s
the initial radius of the disk = 16 cm = 0.16 m
final radius = 17 cm = 0.17 m
Angular momentum = ω
where = rotational inertia = mass x
ω = angular speed
For the initial case
= m x = 0.0256m
Angular momentum = 0.0256m x 0.21 = 0.0054m
For second case
= m x = 0.0289m
Angular momentum = 0.0289m x ω = 0.0289mω
For conservation of rotational momentum, initial angular momentum must be equal to the final angular momentum
0.0054m = 0.0289mω
m cancels out, we have
0.0054 = 0.0289ω
ω = 0.187 rad/s
converting back to rpm, we have
N = 0.187/2π = 0.029 rotations per sec
0.029 x 360 = <em>10.44° per sec</em>
Explanation:
power = Force × distance /time
power = 944N × 12.4m/36secs
power = (944×12.4/36)Nms—¹
power = 390.2Nms—¹ or 390.2Watts or 390.2Js—¹
A person's weight will be greater on Jupiter than on earth
Answer:
A. The system is the pot and water.
Explanation:
Thermodynamics is an aspect in science which deals with the applications of heat energy. The useful applications of heat energy to perform work.
In the given question, the pot and water is the system which both absorbs heat energy from the stove. Thus, the system is a closed system since it shares heat energy with its surroundings.
The surrounding of the system extends from the boundary of the pot to the universe.