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yarga [219]
3 years ago
13

Besides providing food and lumber, some trees are valuable natural resources because they contain substances that help make ____

_. A. ore B. medicines C. petroleum D. silicon wafers
Physics
2 answers:
kondaur [170]3 years ago
6 0
Medicines would be your answer


antiseptic1488 [7]3 years ago
4 0

The correct answer is B. Medicines

Explanation:

Trees are valuable natural resources used to obtain food through edible fruits, roots, etc and also to obtain lumber that is used to build structures, furniture, among others. Besides this, trees are valuable because it is possible to obtain medicinal substances from these. For example, willow bark can be used to treat fever, and pain because the substance in it acts similarly to aspirin. This makes thousand of tree species to be used in the process of creating medicines. Thus, besides food and lumber trees provided substances that help make medicines.

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A rock is launched vertically upward by a slingshot. The elastic band of the slingshot accelerates the rock from rest to 40 m/s
eimsori [14]

Answer:

0.016 s

Explanation:

Initial velocity, u = 0

use the third equation of motion to find the acceleration of the rock.

2as=v^2-u^2\\a = \frac{40^2-0}{2\times0.1} =8000 m/s^2

Net displacement in the vertical direction would be zero. y = 0

Use second equation:

s=ut+\frac{1}{2}at^2\\0=0+\frac{1}{2}(8000)t^2\\t= 0.016 s

Thus, the rock will return to its initial release point in 0.016 s.

5 0
3 years ago
A skier starts from rest at the top of a 40.8 m hill, skis down a 30 degree incline into a valley, and continues up a 32.5 m hig
Volgvan

Answer:

a. 28.27 m/s

b. 12.75 m/s

c. No

Explanation:

a.

The bottom

Ek = Ep

¹/₂ * m * v² = m * g * h₁

v = √ 2 * g * h₁  = √ 2 * 9.8 * 40.8 m

v = 28.27 m/s

b.

At the top

Ek = Ep

¹/₂ * m * v² = m * g * h₁

v = √ 2 * g * h₁  = √ 2 * 9.8 * (40.8 - 32.5) m

v = 12.75 m/s

c.

No in this case the axis is the same of the motion so, the angle doesn't affect the result

3 0
3 years ago
Urgent!
Alla [95]

I think it's 0.6.                 ∞

Hopefully, it's correct... ∵-∵

7 0
3 years ago
Why is photosynthesis important to cellular respiration?
Mnenie [13.5K]
Photosynthesis's products are the reactants for cellular respiration. Photosynthesis equation: 6CO2 + 6H2O+ light ->C6H12O6 + 6O2. Then basically swap it and instead of light out in energy: C6H12O6 + 6O2 -> 6CO2 + 6H2O + Energy. Hope this helps!

6 0
3 years ago
Why is it important for scientist to repeat an experiment several times?
Annette [7]
An experiment can only be considered valid if it can be repeated several times and end up with the same results. Some scientists like to repeat experiments in order to gain skills and develop new methods for the experiments.
8 0
3 years ago
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