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valentina_108 [34]
3 years ago
13

Photosynthesis is an endothermic chemical reaction that forms sugars from carbon dioxide, water, and the sun's energy. Which of

the following must be true of photosynthesis?
Physics
2 answers:
jenyasd209 [6]3 years ago
6 0
<span>The reaction can take place only if energy is added.</span>
Harman [31]3 years ago
4 0

Answer: the correct answer is 100% A. the reaction can only take place if energy is added.

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Estimate the number of times the earth will rotate on its axis during a human’s lifetime
Fudgin [204]

Here we have to calculate  the number of rotations made by earth around its own axis in the entire life time of a human being.

The average human life is 50 years .

Each year is 365.5 days

Hence 50 years =50 *365.5 days

                 =18,275 days

The earth rotates around its own axis in 23 hours 56 minutes and 4 second which is approximately equal to 24 hours or one days.

Hence one rotation takes one days.

⇒18,275 days =18,275 rotations

Hence the total number of rotations made by earth around its own axis in the life time of a average human life time will be 18,275 times

7 0
3 years ago
A car moves with constant acceieration of -0.s m/s? on a straight portion of the road. Att- 0s the car has a velocity of 69 mph,
Crazy boy [7]

Answer:

b) d = 0.71 Km

Explanation:

Car kinematics

Car 1 moves with uniformly accelerated movement

v_f^2=v_o^2+2a*d Formula (1)

d: displacement in meters (m)

v₀: initial speed in m/s

vf: final speed in m/s

a: acceleration in m/s²

Equivalences:

1mile = 1609.34 meters

1 hour = 3600s

1km = 1000m

Known data

v_o = 69\frac{mile}{hour} *1609.34\frac{meter}{mile} *\frac{1}{3600}\frac{hour}{s}=30.8 \frac{m}{s}

v_f= \frac{69}{2} \frac{mile}{hour} =34.5\frac{mile}{hour}=15.4 \frac{m}{s}

a = -0.5 m/s²

Distance calculation

We replace data in the Formula (1)

15.4^2 = 30.8^2+2(-0.5)*d

2(0.5)*d = 30.8^2 - 15.4^2

d =\frac{ 30.8^2 - 15.4^2}{2(0.5) }= 717.6m

d = 717.6 m\frac{1km}{1000m} = 0.7176Km

8 0
3 years ago
Which instrument is not used to measure air pressure
Virty [35]
It would be b. anemometer. it measures the speed of wind or any current of gas.
5 0
3 years ago
The frequency of a given region of the electromagnetic spectrum ranges from 3 × 1016 − 3 × 1019 hertz. Which type of wave is fou
Bond [772]
<span>Wavelength = (speed) / (frequency)
Speed of EM radiation = 3 x 10⁸ m/s

Frequency (3 × 10¹⁹ Hz)  ===>  wavelength  =  0.01 nanometer

Frequency (3 × 10¹⁶ Hz)  ===>  wavelength  =  10 nanometers</span>

This is the region of X-rays.
5 0
3 years ago
Read 2 more answers
Spaceship flies past mars with a speed of 0.985c rela- tive to the surface of the planet. when the spaceship is directly overhea
galben [10]
The proper time would be the time measured in the rest frame of the event, so in this case the observer on mars would measure the proper time.
8 0
3 years ago
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