Answer:
a) Kinetic energies
K₁ = 1.2 J
K₂ = 7.5 J
b) The bullet that has the highest kinetic energy is the one with the highest speed , v = 50 m/s , K₂ = 7.5 J
c) K₂ -K₁ = 6.3 J
Explanation:
The kinetic energy (K) is that due to the movement of a body and is calculated as follows:
K = (1/2) m*v² (J)
Where :
m : the mass of the body ( kg)
v is the speed of the body (m/s)
Data
m₁ = m₂ = 0.006 Kg
v₁ = 20 m/s
v₂ = 50 m/s
a)Calculation of the kinetic energy
K₁ = (1/2) (m₁)*(v₁)²
K₁ = (1/2) (0.006)*(20)²
K₁ = 1.2 J
K₂= (1/2) (m₂)*(v₂)²
K₂ = (1/2) (0.006)*(50)²
K₂ = 7.5 J
b) K₂ ˃ K₁
The bullet that has the highest kinetic energy is the one with the highest speed , v = 50 m/s, K₂ = 7.5 J
c) Difference of their kinetic energies (K₂ -K₁)
K₂ -K₁ = 7.5 J - 1.2 J = 6,3 J
Answer: 30 meters
Explanation: 5 meters times 7 seconds
<h2><u>
Answer</u>
:</h2>
Distance = 50m
Displacement = 50m to the right
<h2><u>
Explanation</u>
:</h2>
<em>Distance</em> is the total length of a given path. It is a scalar quantity and thus takes no consideration on the direction of the path.
<em>Displacement</em> on the other hand is the change in position of an object. It is a vector quantity and takes consideration on the direction of the object.
From the question:
<em>The swimmer swims half lap by moving from the left end to the right end of a pool that is 50m long.</em>
Distance = total length of the given path = 50m
Displacement = change in position of the swimmer from the left end (0m) to the right end (50m) = 50 - 0 = 50m
Since direction is important in displacement, the complete details of the displacement should be 50m to the right
The rabbit depends on the energy of the sun because the plants the rabbit eats need the sun to reproduce and to go through photosynthesis to grow over and over again for the rabbit to have food.
Answer: (1) Putrefaction
(2) Biodegradable
(3) Refuse.
Putrefaction refers to <u>decomposition of organic substances</u> usually dead plants' and animals' bodies <u>by microorganisms</u>.
Therefore, it matches with first definition that states the decay of organic matter caused by microorganisms.
Biodegradable substances are <u>decomposed by living organisms such as microorganisms.</u>
Therefore, it matches with the second definition that states susceptible to decomposition by living organisms.
Refuse refers to something which is <u>no longer useful</u>.
Therefore, it matches with the third definition of waste.
