Answer and Explanation:
Based on the given information, the formula and the computation is given below:
a. The rotational inertia of the hoop is shown below:
= 0.73 × (0.36 + 0.1444)
= 0.368 
b. Now the rotational kinetic energy is
= 36.58 J
We simply applied the above formula for rotational inertia and rotational kinetic energy in order to reach with the correct answer
False it’s the unit of force
Answer:
Scallops use jet propulsion to move from one place to another. Their shells make them denser than water, so they normally rest on the ocean floor. If a scallop wishes to remain stationary, hovering a fixed distance above the ocean floor, it must eject water <u>downwards</u> so that the thrust force on the scallop is <u>upwards</u>.
Explanation:
For every action, there is a reaction with the same magnitude but in the opposite way (third law of Newton), so when the scallop ejects water downwards, another force appears that pushes the scallop upwards.
To find the radial velocity of the object we are going to apply the regular Doppler formula:
[measured wavelenght - rest wavelenght/ rest wavelenght] = V/C, where V is the radial velocity and C is the speed of light which is equal to 300,000km/sec.
[400 - 800/800] = V/300,000 = - 150,000.
This means that the object is moving at a velocity of 150,000km/sec toward the observer.
The minus sign infront of the answer indicates that the object is moving towards the observer while a positive value will indicate that the object is moving away from the observer.
