A current-carrying wire with many loops is called solenoid.
<u>Explanation:</u>
A current-carrying wire is a conductor. When it is turned into a coil for better use, it is called a solenoid. A solenoid has specific features. Since it is wrapped up in many turns, it creates a magnetic field inside. They also convert electric current into mechanical work or action.
The solenoid may or may not be straight. Anything wrapped into a coil is a solenoid. While the study, the length of a solenoid is taken greater than the diameter. And the shape is called a helix.
Answer:
<h2>250 kg</h2>
Explanation:
The mass of the rock can be found by using the formula

p is the momentum
v is the velocity
From the question we have

We have the final answer as
<h3>250 kg</h3>
Hope this helps you
The most expensive military aircraft is B-2 Spirit bomber, which costs 2.2 billion dollars! The Northrop B-2 Spirit, is also known as the Stealth Bomber.
Source: https://www.aviationcv.com/aviation-blog/2016/top-5-most-expensive-military-aircraft