Answer:
a) degrees
b) degrees
c) degrees
Explanation:
If we have a vector in a two dimensional space. The angle respect the x axis can be founded from the following expression:
And then the angle is given by:
Part a
Ax = 11 m and Ay = 11 m
For this case the angle would be:
degrees
Part b
Ax = 19 m and Ay = 11 m
For this case the angle would be:
degrees
Part c
Ax = 11 m and Ay = 19 m
For this case the angle would be:
degrees
Answer:
Not conserved
Explanation:
Mechanical energy is the sum of potential energy (U) and kinetic energy (K):
The law of conservation of energy states that for any isolated system (=no external forces acting on it), the mechanical energy is conserved.
However, the skier skiing down the slope is not an isolated system. In fact, the force of friction between the surface of the slope and the skis acts on the skier: because of this, some of the mechanical energy of the skier is actually 'lost' while he skies down the slope, and converted into thermal energy (heat) of the snow.
Answer:
plug it into your calculator
Explanation:
Kinetic energy = KE = Joules = J
KE= 1/2mv^2
90,000 = 1/2 m (12^2)
180,000 = m (144)
m = 180,000 / 144
The crystal of potassium chloride has a definite shape because it consists of particles that are held in fixed positions.
Ionic solids are crystalline in nature. This means that the ions that compose them are arranged in an orderly manner to form a crystal lattice.
This crystal lattice is composed of a regular repeating pattern called the unit cell. The ions in these unit cells are held together by strong electrostatic forces.
Hence, the crystal of potassium chloride has a definite shape because it consists of particles that are held in fixed positions.
Learn more: brainly.com/question/488789