Answer:
A. Potential energy decreases and kinetic energy increases, but the total amount of mechanical energy remains the same.
Explanation:
Potential energy is the latent energy in an object at rest. Kinetic energy, is the energy expressed by an object in motion.
The ball is starting at rest and that is where the potential energy is at. In that case, the ball has no kinetic energy (no movement). When the ball begins to move that kinetic energy starts to increase and the potential energy decreases because it is no longer at rest.
Answer:
7.5 J
Explanation:
To answer the question given above, we need to determine the energy that will bring about the speed of 1 m/s. This can be obtained as follow:
Mass (m) = 15 Kg
Velocity (v) = 1 m/s
Energy (E) =?
E = ½mv²
E = ½ × 15 × 1²
E = ½ × 15 × 1
E = ½ × 15
E = 7.5 J
Therefore, to change the speed to 1 m/s, the employee must do a work of 7.5 J.
-B because metal hardly breaks but non metal items such as glass or plastic does!
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Description
In classical mechanics, impulse is the integral of a force, F, over the time interval, t, for which it acts. Since force is a vector quantity, impulse is also a vector quantity. Impulse applied to an object produces an equivalent vector change in its linear momentum, also in the resultant direction.
Answer:
Explanation:
a ) A force of 6 N , causes elongation of .03 m
Spring constant
k = 6 / .03
= 200 N / m
b )
Amplitude A = .04 m .
Maximum velocity of a particle in SHM
= ωA where ω is angular velocity and A is amplitude
=
x A
=
x A
= 20x .04 = 0.8
Maximum velocity of a particle
= 0.8 m ² s
Minimum velocity will be zero at extreme point ( at turning point )
c )
Minimum acceleration is zero at middle point ( equilibrium position )
maximum acceleration
= ω²A
= k / m x A
= 400 x .04
= 16 m / s
d )
At halfway point velocity will be √ 3 / 2 times the maximum velocity
velocity at mid point
= √ 3 / 2 x max velocity
.866 x
= .866 x 0.8
= .693 m /s