1) Potential energy before the fall: 98 J
The gravitational potential energy of an object is given by:
where m is the mass of the object, g is the gravitational acceleration and h the heigth of the object above the ground.
In this problem, m = 2 kg, g = 9.8 m/s^2 and h = 5 m: substituting into the equation, we find
2) Work done by gravity: 98 J
The work done by a force is given by:
where
F is the magnitude of the force
d is the displacement of the object
is the angle between the direction of the force and the displacement
In this problem:
d = 5 m
Therefore,
Answer:
Electric field due to uniformly charged sphere is 9.2 x 10⁴ N/C
Explanation:
Given :
Radius of the solid sphere, R = 42 cm = 0.42 m
Total charge on the sphere, Q = 23 μC = 23 x 10⁻⁶ C
Distance of the point from the center of the sphere, r = 150 cm = 1.5 m
Since, r > R, so the point is outside the sphere. Thus, the electric field outside the uniformly charged sphere is determine by the relation:
Here k is constant and its value is 9 x 10⁹ N·m²/C².
Substitute the suitable values in the above equation.
E = 9.2 x 10⁴ N/C
<u>Yes, work is done when a book falls of the table.</u>
This is because:
When the book falls, it's potential energy is converted into kinetic energy. As it reaches the floor down, this kinetic energy is converted to heat energy and sound energy due to the impact.
When a force is imposed on an object to cause displacement of that object, work is done on that object. For a force to do work on an object, there should be a displacement and this force should cause the displacement. So here, since the book falls from the table and causes the displacement of the book from the table to the floor. It is said that work is done.
Work can be given by the formula:
W = F • d
where F is the force and d is the displacement.
Answer:
Explanation:
The two triangles are similar what is the length of DE
Answer:
See Explanation
Explanation:
The density of a substance is an intrinsic property. Intrinsic properties are properties that are characteristic of a material. It does not depend on the amount of substance present.
Since density is an intrinsic or intensive property, If you cut a piece of gold in half, the density of each piece will still be 19.32 g/cm 3 because density does not depend on the size of the gold piece.
