Which device typically use DC current to operate?

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True. Explanation: In this instance, the area of the graph represents the impulse. Impulse is defined as the change in an object's momentum. Moreover, it is also expressed as the product of the force acting on an object and the duration of the impact. When we graph the force against time, if the force remains constant, the resultant graph will take on a rectangular shape, and the area under that graph will equal the impulse's definition.

Answer: The result to the query is 0.25 ohms

Explanation:

R = u x/A.......1

where u represents the resistivity of the

rod, A is the cross-sectional area, and x denotes

the length of the rod.

Let R* represent the resistance across the adjacent sections of the rod.

Then, R* = u1/4.......2

By comparing equation 1 with equation 2, we find that

R* = 1/4

which equals 0.25 ohms.

Response: Liquids conform to the shape of their container, yet they maintain a specific volume. Similarly, gases adjust their shape based on their container, but the volume of a gas is variable depending on the containment it occupies.

Explanation:

a.

The equation for the gravitational force acting between two masses is given by:

where

G represents the gravitational constant

M and m refer to the masses of the two objects

r indicates the distance separating the objects

In this scenario, we have:

M = 7000 kg, the elephant's mass

m = 0.02 kg, the mouse's mass

r = 1 m, the distance between them

Plugging these values into the equation will allow us to compute the gravitational force that the elephant applies on the mouse:

b.

The next part can be tackled by recalling Newton’s third law, which asserts that:

"When object A applies a force (action) on object B, object B simultaneously applies an equivalent and opposite force (reaction) on object A". In this illustration, the elephant is object A and the mouse is object B: thus, the gravitational force from the elephant on the mouse is the action, while the force from the mouse on the elephant acts as the reaction. Both forces match in magnitude yet differ in direction: therefore, the gravitational force the mouse exerts on the elephant can be expressed as

where the negative signifies an opposite direction.