Answer:
The study of matter and energy, and the relationship between matter and energy
Explanation:
Physical science is natural science studies( in chemistry, geology, physics,astronomy) that focus on non-living materials and natural forces.The non-living systems are mainly the inorganic world.Here the properties of matter and energy in non-living forms are investigated with their connection with nature.
By using the equations for <em>parabolic</em> motion, we proceed to present the answers for the paragraph seen in the picture: a) t ≈ 0.553 s, b) s = 2.212 m, c) s = 11.060 m.
<h3>How to analyze a system on parabolic motion</h3>
A system is on <em>parabolic</em> motion if such system can be represented as a particle, that is, a system whose geometry is negligible, and its motion is a combination of <em>horizontal</em> movement at <em>constant</em> velocity and <em>vertical</em> <em>uniformly accelerated</em> movement due to gravity and all <em>viscous</em> and <em>rotational</em> effects are negligible.
The time required for the droplet to reach the ground is:
1.5 m = (1 / 2) · (9.807 m / s²) · t²
t = √[2 · (1.5 m) / (9.807 m / s²)]
t ≈ 0.553 s
And the <em>horizontal</em> distance traveled by the droplet is:
s = (4 m / s) · (0.553 s)
s = 2.212 m
Now, we apply the same procedure for the case of sneezing person:
1.5 m = (1 / 2) · (9.807 m / s²) · t²
t = √[2 · (1.5 m) / (9.807 m / s²)]
t ≈ 0.553 s
s = (20 m / s) · (0.553 s)
s = 11.060 m
To learn more on parabolic motion: brainly.com/question/16992646
#SPJ1
In Burglar alarm, LDR acts an AND gate.
Answer: C
Explanation
The LDR is light dependent resistor. The principle used in the working of LDR is that the resistance is inversely proportional to the intensity of light falling on the diode.
In burglar alarm, LDR diode is combined with an IC 555.
Normally an LED source is made to be incident on the LDR diode with same intensity such that the resistance will be maintained constant.
As the LDR is connected with IC, the voltage will be high when light is falling on the diode.
The IC will give only two output states that is high and low. This confirms that LDR in burglar alarm act as AND gate.
As the thief enters and crosses the LED light, the intensity of the light falling on the diode will decrease leading to decrease in the voltage which will cause the alarm to beep.
Red Skull's relative velocity to Captain America, towards the left front of the
truck is approximately <u>33.23 m/s</u> in a direction from the North of
approximately <u>9.18°</u>.
Reasons:
Assumptions;
Taking the north direction as positive.
The activity takes place on the trucks.
The trucks are moving towards each other.
Solution:
Vector form of net speed of Red Skull, is given as follows;
- v₁ = -(
× 3.5)·i + ( × 3.5 + 12.5)·j
Vector form of the net speed of Captain America is given as follows;
- v₂ = ( × 4.0)·i - ( × 4.0 + 15)·j
Relative velocity, v₁₂ = v₁ - v₂
∴ v₁₂ = (-( × 3.5) - ( × 4.0))·i + (( × 3.5 + 12.5) + ( × 4.0 + 15))·j
- v₁₂ =
·i + 
·j
Red Skull's velocity relative to Captain America, v₁₂ = ·i + ·j
Therefore;
- Red Skull appears to be moving West at <u>5.3 m/s</u> and North at <u>32.8 m/s</u>
- The direction is
Therefore;
- Red Skull appear to be moving at 90° - 80.2° ≈ 9.18° towards the left front end of the truck moving North
The magnitude of the velocity, |v₁₂|, is given as follows;
·
The magnitude of Red Skull's velocity relative to Captain America is,
therefore;
|v₁₂| ≈ <u>33.23 m/s</u>
Learn more here:
brainly.com/question/24430414
