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Lubov Fominskaja [6]
3 years ago
15

what essential characteristic does a good experiment have? a. a control group is given the experimental treatment. b. a single v

ariable is tested. c. a control is used. d. both b and c
Physics
1 answer:
madreJ [45]3 years ago
8 0
A. A control group is given the experimental treatment.
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Why is respiration an exothermic reaction? A. a large amount of energy is released into its surroundings B. the heat content, q,
Rina8888 [55]
A. a large amount of energy released into its surrounding

During the respiration, glucose molecules are converted to other molecules in a series of steps. They finally end up as as carbon-dioxide and water.

The overall reaction is

<span>C₆H₁₂O₆ + 6O₂ → 6CO₂ + 6H₂O + 2805 kJ
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The reaction is exothermic reaction because <span>C=O and O-H bonds in the products are so much more stable than the bonds in the reactants.
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Bond energy is the average needed to break a bond.

Some bond energies are:
C-C = 347 kJ/mol
C-H = 413kJ/mol;
C-O = 358 kJ/mol;
O-H = 467 kJ/mol;
O=O = 495 kJ/mol;
<span>C=O = 799 kJ/mol</span>



4 0
3 years ago
Read 2 more answers
What factors influence the speed of a wave?
fiasKO [112]

Answer: A medium is any substance or region through which a wave is transmitted. The speed of a wave is dependant on four factors: wavelength, frequency, medium, and temperature. Wave speed is calculated by multiplying the wavelength times the frequency (speed = l * f).

3 0
3 years ago
You take a Frisbee to the top of the Washington Monument and send it sailing along horizontally at a speed of 5 m/s from the ver
Dominik [7]

This question can be solved with the help of the equations of motion.

A) The Frisbee will remain in the air for "5.87 s".

B) The frisbee will go "29.4 m" down the range.

A)

To calculate the time, the frisbee will remain in the air, we will use the second <em><u>equation of motion</u></em>, for the vertical motion.

h = v_it+\frac{1}{2}gt^2\\\\

where,

h = height = 169.2 m

vi = initial velocity's vertical component = 0 m/s

g = acceleration due to gravity = 9.81 m/s²

t = time = ?

Therefore,

169.2\ m = (0\ m/s)(t)+\frac{1}{2}(9.81\ m/s^2)t^2\\\\t = \sqrt{\frac{(169.2\ m)(2)}{9.81\ m/s^2}}

<u>t = 5.87 s</u>

<u />

B)

Now, we will calculate the horizontal range by applying the equation for constant motion. Because the velocity in the horizontal direction will remain constant due to no air resistance

s = vt

where,

s = horizontal range = ?

v= initial velocity's horizontal component = 5 m/s

t = time = 5.87 s

Therefore,

s = (5 m/s)(5.87 s)

<u>s = 29.4 m</u>

<u />

Learn more about <em><u>equations of motion</u></em> here:

brainly.com/question/9772550?referrer=searchResults

8 0
3 years ago
Help please! Test tomorrow!
dlinn [17]

Earth distance to the Sun is about 40 times the Moon's distance from earth.

<u>Explanation:</u>

  • The Earth's distance from the Sun is about 93 million miles. When it expressed in Km, it is 150 million Km.
  • The Moon's distance from Earth is 238,855 miles. When it is 40 times then it will approximately equal to 93 million miles.
  • The Sun's distance from Venus is 67.237 million miles. The Sun's distance from mercury is 35.832 million miles.
7 0
4 years ago
Bone with a latticework structure is called
malfutka [58]
Spongy or the cancellous bone is the bone with lattice work structure
7 0
3 years ago
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