Answer:
B) her moment of inertia increases and her rotational kinetic energy decreases.
Explanation:Moment of Inertia is the term used to describe the rotation of an object in relationship to its own rotation,IT IS THE PRODUCT OF MASS AND THE SQUARE DISTANCE COVERED.
Moment of Inertia is also a resistance force which tend to oppose the impact of a turning force aimed at preventing its rotation about its axis. As the moment of Inertia increases her rotational kinetic energy will continue to decrease,due to the impact of the resistant or opposing force.
Answer:
K.E = 463.04 k J
P = 23.14 Watt
Explanation:
given,
mass of automobile = 1200 kg
velocity = 50 km/h
= 50 × 0.278
= 13.9 m/s
kinetic energy = 
=
K.E = 115.93 k J
vehicle accelerated to velocity = 100 km/h
= 100 × 0.2778
= 27.78 m/s
kinetic energy =
=
K.E = 463.04 k J
work done = change in kinetic energy
= 463.04 - 115.93
= 347.11 J
Power = 
Power =
P = 23.14 Watt
Answer:
(a): When the four resistors are connected in series the equivalent resistor value is Req= 48Ω
(b): when the four resistors are connected in parallel the equivalent resistor value is Req=3Ω
Explanation:
R=R1=R2=R3=R4= 12Ω
(a)
Req= R1+R2+R3+R4
Req= 48 Ω
(b)
Req= (1/12 * 4)⁻¹
Req= 3 Ω
By conservation of angular momentum
I1*ω1 = I2*ω2 -----> I1*ω1/I2 = 129*95/32 = 383 RPM <<<<<
383 rev/min * 2πrad/rev * 1min/60s = 383*2π/60 = 40.1 radians/s <<<
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