Inefficiency is a big struggle when it comes to renewable resources. A form of energy might take more energy to harness than it provides because the energy might dissipate. Energy transformation is never 100% conversion. Some of the energy dissipates in the form of heat.
The rate of change (magnitude and direction) of its angular momentum at this instant is <u>115 kg m/s².</u>
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The rate of change of angular momentum is equal to the net torque acting on the rock. The only force acting on the rock is the weight of the rock that is, mg.
As torque is equal to the product of the tangential component of force (
and distance (r) from the axis of rotation to the line of force, the net torque acting on the rock is,
Here, r is the distance from point O to the line of force.
This torque is equal to the rate of change of angular momentum of the rock.
Calculation:-
torque = mgcosθ
τ = mgrcosθ
= 115 kg m/s²
The magnitude of angular momentum is <u>115 kg m/s².</u>
Learn more about angular momentum here:-brainly.com/question/4126751
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Answer:
(a) Angular speed of resultant combination will be rev/min
(b) Fraction of total energy loss will be 0.9
Explanation:
We have given angular speed of the first wheel
According to question moment of inertia of second wheel is 9 times the moment of inertia of first wheel
So
(a) Now according to law of conservation of angular momentum
(b) Change in rotational kinetic energy will be equal to .......eqn1
Putting these values in eqn 1
Change in kinetic energy will be 0.9
The modern state of Israel was created in 1948.
a). no; the Sinai war was 8 years later
b). no; the Camp David accords were hammered out 30 years later
c). no; the Yom Kippur war broke out 25 years later.
d). yes. Following World War II (ended in 1945), the UN voted and
passed resolutions to Partition the British Mandate in Palestine.
The authorities in the Jewish partition at that time accepted the
partition plan, and declared Israel a sovereign state as soon as
it took effect.
The authorities in the Arab partition at that time rejected the partition
plan. They got together with some of their buddies in other nearby
countries who were not even affected by the plan, and together,
their combined armies rolled toward Israel as soon as the plan
took effect. Their intention was to undo Israel as an independent
country. Strange as it may seem, although Israel didn't even have
an army yet, the invading armies failed that time. And though it
may seem even stranger than that, even now ... 68 years later ...
they still don't accept Israel's existence, and they still plan to get rid
of it, and they still incite their people and teach their children to hate
Israel and all Jews in general.