Answer:
Well a s the temperature increases, at a certain point called the Curie temperature, a magnet will lose its strength completely. So once the metal cools, its ability to attract magnets returns, though its permanent magnetism becomes weak. In general heat is the factor that has the most effect on permanent magnets.Explanation:
Liquids have definite volume and indefinite shape.
While the box is at rest, the net vertical force acting on it is
∑ <em>F</em> = <em>n</em> - <em>w</em> = 0
where <em>n</em> = magnitude of the normal force (table pushing up on the box) and <em>w</em> = weight of the box. So we have
<em>n</em> = <em>w</em> = <em>mg</em> = (3.0 kg) (9.8 m/s²) = 29.4 N
The coefficient of static friction between the table and box is 0.40, so the maximum magnitude of static friction is
<em>f</em> = 0.40 <em>n</em> = 0.40 (29.4 N) = 11.76 N
which is to say, the box will not move unless a force larger than this is applied to the box.
10 N is of course smaller than 11.76 N, so the box would stay at rest, and its acceleration would remain 0 m/s².
The rock will be at 90.4 m from the top of the cliff.
<u>Explanation</u>:
The rock is thrown with the “initial velocity” 3 m/s. We need to find how much distance does the rock traveled in 4 seconds (t).
From the “kinematic equations” take
Where, “s” is distance traveled, “u” initial velocity of the object, “t” time the object traveled and “a” acceleration due to gravity is 
Substitute the given values in the above formula,
The rock is at height of 90.4 m from the top of the cliff.
Answer:
P.E = 82320 joules
Explanation:
Given,
The mass of the squirrel, m = 700 Kg
The squirrel leaped to a height, h = 12 m
The acceleration due to gravity, g = 9.8 m/s²
The potential energy of a body is possessed by its height. It is given by the formula
P.E = mgh joules
Substituting the values in the above equation
P.E = 700 Kg x 9.8 m/s² x 12 m
= 82320 joules
The Potential Energy of the squirrel is, P.E = 82320 joules
