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Nadusha1986 [10]
3 years ago
9

Which terrestrial ecosystem or life zone produces the highest net primary productivity per year? a. temperate forest b. Savanna

c. tundra d. swamps and marshes e. extreme desert
Physics
1 answer:
horsena [70]3 years ago
8 0

a. hope this helps...

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The closure temperature represents the point when ________. A. a magma cools to the point where minerals begin to crystallize B.
melomori [17]

The closure temperature represents the point when isotopes are no longer free to move out of a crystal lattice.

Answer: Option C

<u>Explanation:</u>

The closure temperature can also be termed as blocking temperature. It is mostly used in radiometric dating. As the temperature decreases, below a certain point the isotopes may get freeze in their lattice positions. And there may be slowing of diffusion.

At the closure temperature, that rate of diffusion will be zero as the isotopes will be no longer free to move out of crystal lattice. So, this is termed as closure or blocking temperature. As the isotopes loose their ability to move, their concentration will remain fixed in their position leading to measurement of radiation dating.

5 0
3 years ago
A nurse applies a horizontal force of 147 N on a bed that has a mass of 152 kg,The magnitude of the normal force acting on the b
oee [108]

Answer:

1490 N

Explanation:

The force applied by the nurse is horizontal, so there's no vertical component.

Therefore, the normal force is simply equal to the weight of the bed.

N = mg

N = (152 kg) (9.8 m/s²)

N = 1490 N

3 0
3 years ago
Using hooke's law find the elastic constant of a spring that stretches 2 cm when 4newton force is applied to it
erica [24]

<u>Answer:</u>

2N/cm

<u>Step-by-step explanation:</u>

According to the Hooke's Law, the force required to extend or compress a spring is directly proportional distance you can stretch it, which is represented as:

F=kx

where, F is the force which is stretching or compressing the spring,

k is the spring constant; and

x is the distance the spring is stretched.

Substituting the given values to find the elastic constant  k to get:

F=kx

4=k(2)

k=\frac{4}{2}

k=2

Therefore, the elastic constant is 2 Newton/cm.

5 0
3 years ago
6. How much power does it take to lift 30.0 N 10.0 m high in 5.00 s?
Zina [86]

Answer:

60 W

Explanation:

The work done in lifting the object is given by:

W=Fd

where

F = 30.0 N is the weight of the object

d = 10.0 m is the displacement covered by the object

Using the formula,

W=(30.0 N)(10.0 m)=300 J

Now we can calculate the power, which is given by

P=\frac{W}{t}

where

W = 300 J is the work done

t = 5.00 s is the time interval

Substituting,

P=\frac{300 J}{5 s}=60 W

8 0
3 years ago
Below is a nuclear equation. What number should go in the place marked (i)?
valina [46]
Djdjdjddjddkjddiejrjrrjrjrkrkrkrjrjr
6 0
3 years ago
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