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BigorU [14]
3 years ago
6

If you shine red light at a green plant and green light at a green plant, knowing that a plant must absorb light to grow, which

plant will grow faster?
Physics
1 answer:
Ostrovityanka [42]3 years ago
3 0
There's no way to tell for sure which plant will grow faster, because
we don't know if a plant gets any benefit from red light. 

But we do know for sure that it won't be the one we shine green light on. 
We know that green light is no use to green plants at all ... that's why
when green light falls on them, they don't even bother absorbing it.
They just let it bounce off, and that's why they look green to us.
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A steel cable has a cross-sectional area 2.54 10-3 m2 and is kept under a tension of 1.01 104 N. The density of steel is 7860 kg
ElenaW [278]

Answer:

The speed is equals to 22.49 m/s

Explanation:

Given Data:

Area = A=2.54*10^-^3m^2\\Force = F = 1.01*10^4N\\density = p = 7860 kg/m^3

Required:

Speed of Traverse wave = c =?

Solution:

As we know that

p=m/V\\\\ p=m/(L*A)\\p*A=m/L

Now the equation for speed of traverse wave is calculated through:

\sqrt \frac{F*L}{m}\\

=\sqrt\frac{F}{m/L} \\\sqrt{} \frac{F}{p*A}

Substituting the values

\sqrt\frac{1.01*10^4}{7860*2.54*10^-^3}  \\

=22.49 m/s

4 0
3 years ago
In order to model the motion of an extinct ape, scientists measure its hand and arm bones. From shoulder to wrist, the arm bones
wel

Answer:

0.37 m

Explanation:

Let the shoulder be the origin.

The center of mass of the arm bones is 0.60 m/2 = 0.30 m and the center of mass of the hand bones is 0.10 m/2 = 0.05 m since they are modeled as straight rods with uniform density and the center of mass of a rod is x = L/2 where L is the length of the rod.

The center of mass y = (m₁y₁ + m₂y₂)/(m₁ + m₂) where m₁ = mass of arm bones = 4.0 kg, y₁ = distance center of mass of arm bones  from shoulder = 0.30 m, m₂ = mass of hand bones = 1.0 kg and y₂ = distance of center of mass hand bones from shoulder = x₁ + distance of center of hand bones from wrist = 0.60 m + 0.05 m = 0.65 m

Substituting these into the equation for the center of mass, we have

y = (m₁y₁ + m₂y₂)/(m₁ + m₂)

y = (4.0 kg × 0.30 m + 1.0 kg × 0.65 m)/(4.0 kg + 1.0 kg)

y = (1.20 kgm + 0.65 kgm)/5.0 kg

y = 1.85 kgm/5.0 kg

y =  0.37 m

The distance of the center of mass from the shoulder is thus y = 0.37 m

7 0
3 years ago
24. What determines an element's chemical properties?<br> A
Maurinko [17]

Explanation:

The chemical properties of an element are determined by the configuration of its electrons in orbit around its nucleus. ... See a Periodic Table of the Elements. The number of protons in the nucleus of an atom is its Atomic Number.

3 0
3 years ago
An airplane flying at a velocity of 610 m/s lands and comes to a complete stop over a 53 second period of time.
Airida [17]

Answer:

a = - 11.53[m/s^2]

Explanation:

The airplane slows down as its speed decreases from the initial value of 610 [m/s] to zero.

To calculate the acceleration value we use the following kinematics equation:

v_{f} = v_{i}+(a*t)\\

where:

Vf = final velocity = 0

Vi = initial velocity = 610 [m/s]

a = acceleration [m/s2]

t = time = 53 [s]

Now replacing:

0 = 610 + (a*53)

-610 = 53*a

a = - 11.53[m/s^2]

The negative sign means that the aircraft is losing speed, i.e. slowing down

6 0
4 years ago
Why does friction increase as speed increases??
kozerog [31]
Friction is directly related to air particles.

When we say that friction is high, it means that you're colliding with lots of air particles, and hence you can't speed up as easily.
Thus, the more air particles you encounter, the higher the friction.

The faster you go, the more particles you will encounter in a given time; hence at higher speeds, the friction is higher.
7 0
3 years ago
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