Answers:
a)
b)
Explanation:
a) We can solve this knowing the angular momentum is conserved, then:
(1)
Where:
is the initial moment of inertia of the system
is the initial angular velocity
is the final moment of inertia of the system
is the final angular velocity
But first, we have to find and :
(2)
(3)
Where:
is the student's moment of inertia
is the mass of each object
is the initial radius
is the final radius
Then:
(4)
(5)
Substituting the results of (4) and (5) in (1):
(6)
Finding :
(7) This is the final angular velocity
b) The rotational kinetic energy is:
(8)
The change in kinetic energy is:
(9)
Since we already calculated these values, we can solve (9):
(10)
Finally:
Answer:
This may help
Examples of Newton's third law of motion are ubiquitous in everyday life. For example, when you jump, your legs apply a force to the ground, and the ground applies and equal and opposite reaction force that propels you into the air. Engineers apply Newton's third law when designing rockets and other projectile devices.
Explanation:
<h3><u>Answer;</u></h3>
B. 3.43 kPa
<h3><u>Explanation</u>;</h3>
Pressure is given by the formula;
Pressure = Force / Area
Force is the product of mass and acceleration due to gravity.
Thus; Force = mass x acceleration due to gravity
Substituting;
Force = (350 kg) x (9.8 m/s²)
Force = 3430 N
Then, using the first equation;
Pressure = 3430 N / 1m² or Pa
<h3> <u>= 3.43 kPa</u></h3>
Answer: Blackbody
Explanation:
what is black body radiation ?
An ideal body which can emit and absorb radiation of all frequencies is called a black body. The radiation emitted by such bodies is called black body radiation.
How is blackbody radiation produced?
Electromagnetic radiation is produced from all objects according to their temperature. An idealised object that consumes the electromagnetic energy that it comes into contact with is a black body. In a continuous continuum, which then emits thermal radiation according to its temperature.
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There are 3 different types of energy. These 3 are fossil fuel, nuclear energy, and renewable energy. Most electricity is generated by ether wind, solar, or thermoelectric. Thermoelectric produces energy by burning coal,natural gas, and oil in a boiler.