Answer:
We show added energy to a system as +Q or -W
Explanation:
The first law of thermodynamics states that, in an isolated system, energy can neither be created nor be destroyed;
Energy is added to the internal energy of a system as either work energy or heat energy as follows;
ΔU = Q - W
Therefore, when energy is added as heat energy to a system, we show the energy as positive Q (+Q), when energy is added to the system in the form of work, we show the energy as minus W (-W).
If you climb the hill you will be tired also it will be 4.00 meters per second
Explanation:
everything can be found in the picture
The mass of the alcohol sample is 587.46 g.
<h3>Density:</h3>
This is the ratio of the mass of a body and its volume. The S.I unit of Density is kg/m³
To calculate the mass of the alcohol we use the formula below.
Formula:
- D = m/V............... Equation 1
Where:
- D = Density of the alcohol
- m = mass of the alcohol
- V = volume of alcohol
make m the subject of the equation.
- m = DV................. Equation 2
From the question,
Given:
- D = 0.79 g/mL
- V = 743.62 mL
Substitute these values into equation 2
- m = (0.79×743.62)
- m = 587.46 g
Hence, The mass of the alcohol sample is 587.46 g.
Learn more about Density here: brainly.com/question/15940284
Physics is my weakest subject, but it's worth a shot here. Hopefully the answer is right.
velocity(final) = velocity(initial) + acceleration * time
vf = vi + a * t
We want to bring the chihuahua to a stop in half a second. So, velocity(final) = 0 m/s. Its velocity(initial) = 3.3 m/s.
Solving for a, the acceleration.
0 m/s = 3.3 m/s + (a) * 0.5 s
a = -6.6 m/s^2
Force = mass * acceleration
F = m * a
We know the mass of the chihuahua and we just found the necessary acceleration.
Plug those in.
F = (3.6 kg) * (-6.6 m/s^2)
F = -23.76 N
