Answer: 1.274 N minimum force required to slide the book across the surface
Explanation:
Mass of the book = m = 0.2 kg
Normal force acting on the book,N = mg
Coefficient of friction = = 0.65
Minimum force required to slide the book across the surface= F
1.274 N minimum force required to slide the book across the surface
The distance between the charge and the source of the electric field is 2.2 m.
The potential energy <em>U</em> of a charge <em>q</em> placed in an electric field created by a source charge <em>Q</em>, at a distance <em>r</em> from the source charge is given by,
...... (1)
Here, <em>k</em> is the Coulomb constant.
The electric field <em>E</em> at a distance <em>r</em> from the source charge is given by,
......(2)
From equations (1) and (2)
Rewrite the expression for <em>ri.</em>
Substitute 75 J for <em>U</em>, for <em>E</em> and for <em>q</em>.
Rounding off to the nearest tenth, the the distance between the charge and the source charge is 2.2 m
Science based on properties of matter and energy
Answer:
Coring is a defect in an alloy (e.g., a copper nickel alloy) that occurs when a heated alloy is cooled too fast for diffusion to occur.
Explanation:
Answer:
5.11 kg
Explanation:
Hooke's law states that stress is directly proportional to strain. It can be represented by the equation:
F = -kx
Where x is the displacement of the spring’s end from its equilibrium position, F is the force applied to the spring, k is a constant known as spring constant.
At first a force (F) of 62 N i used to stretch a spring by 12 cm (x).
Substituting into Hooke's equation:
F = kx
k = F/x = 62 / 12 = 5.17 N/cm
The spring is then held vertically and an object. The object is acted by upon by acceleration due to gravity since it is vertically upward. Therefore the force created by the object F = mg where g = acceleration due to gravity = 9.8 m/s². It causes a stretch (x) of 9.7 cm
Therefore:
mg = 5.17 N/cm × 9.7 cm
9.81m = 50.117
m = 50.117 / 9.81 = 5.11 kg