C. is correct : ) it is applied when you push and that causes the desk to move
Answer:
u = 8.3 x 10⁻⁴ m/s
Volume to Pass = 5 x 10⁻⁴ L = 0.5 mL
Explanation:
First we find area of pipe:
A = πd²/4
A = π(2.54 x 10⁻² m)²/4
A = 0.02 m²
Now,
Q = (1 L/min)(1 min/60 s)(0.001 m³/1 L)
Q = 1.66 x 10⁻⁵ m³/s
Therefore,
u = Q/A
u = (1.66 x 10⁻⁵ m³/s)/(0.02 m²)
<u>u = 8.3 x 10⁻⁴ m/s</u>
Time for 10 mL:
T = 0.01 L/Q
T = (0.01 L)/(1 L/min)
T = (0.01 min)(60 s/1 min)
T = 0.6 s
Liters of water to pass:
Volume to Pass = uT
Volume to Pass = (8.3 x 10⁻⁴ m/s)(0.6 s)
<u>Volume to Pass = 5 x 10⁻⁴ L = 0.5 mL</u>
Answer:
D, positive
Explanation:
If displacement is increasing (positive) and time cant be negative. This means that the velocity is increasing.
Hope this helps.
<h2>
Answer: C. Kinetic energy</h2>
Explanation:
Heat is energy in transit, in fact it is a transfer of thermal energy from one body to another.
So, when a metal is heated is because we have two bodies with different temperatures and thermal energy is transferred from one body to another, implying a high speed and kinetic energy in the particles involved (electrons in this case).
This is because the kinetic energy of a particle is that energy it possesses due to its movement, and according to the first principle of thermodynamics, there is a relationship between heat and movement, since the metal is composed of particles that are in motion (to a certain extent).
In this way, with the increase of the temperature of the metal, there is an increase of the kinetic energy of its free electrons with a gain of velocity (movement), therefore a gain in kinetic energy.