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IRINA_888 [86]
3 years ago
7

A descriptive investigation is a type of _____.

Physics
2 answers:
denpristay [2]3 years ago
8 0
It’s D or B Because investigation is some tho ur studying or experiment to know the final result Most likely D it’s not a or c
Lesechka [4]3 years ago
6 0
D because i took this test already and i got it correct so you should too
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PLAESE ANSWER FAST!!!!! MAKE SURE IT"S RIGHT
pychu [463]

(if you have Q1: Carbon is found in: living animals and plants, oceans, rocks, atmosphere, and fossil fuels)

Q2: Humans are burning carbon and putting it into the atmosphere.

Q3: True

Q4: While carbon dioxide is in the air waiting to be reabsorbed it traps the sun's heat.

(and if you have Q5: In the last 250 years, the amount of carbon in the air has increased by 40 percent.)

4 0
3 years ago
A swimming pool has the shape of a box with a base that measures 30 m by 12 m and a uniform depth of 2.2 m. How much work is req
Alex777 [14]

Answer:

853776 J

Explanation:

The work-energy needs to pump water out of the pool is the product of the weight of water and distance h

E = Wh = mgh

Since water mass is a body of water we can treat it as the product of density 1000kg/m3 and volume, which is the product of base area and uniform height h

m = \rho V = \rho \int\limits^{2.2}_0 {A} \, dh

Therefore:

E = mgh = g\rho A\int\limits^{2.2}_0 {h} \, dh\\E = 9.8*1000*30*12[h^2/2]^{2.2}_0 = 1764000(2.2^2 - 0^2) = 853776 J

5 0
2 years ago
A student of weight 678 N rides a steadily rotating Ferris wheel (the student sits upright). At the highest point, the magnitude
baherus [9]

Answer:

(a) Magnitude of seat force at lowest point = 678 + 92 = 770

(b) Force exerted by the seat (highest point)  = 310 N

(c) Force exerted by seat (lowest point) = 1046 N

Explanation:

At the highest point the magnitude of force by the seat = 586 N

The weight of the student = 678 N

Thus, at the highest point, the difference in this force is due to the centrifugal force acting on the boy. This can be calculated as follows:

Centrifugal Force = 678 - 586 = 92 N

(a) The magnitude of force on the student by the seat at the lowest point will have to appose both the student's weight and centrifugal force acting towards the ground. This would mean:

Magnitude of seat force at lowest point = 678 + 92 = 770 N

(b) If the wheel's speed is doubled, the centrifugal force will change accordingly. The equation of centrifugal force is given below:

F = m * v^2 / r

We can see from this that the force is directly proportional to the square of the velocity. So if the velocity is doubled, the centrifugal force increases four times.

So at the highest point the centrifugal force will decrease the force of weight acting on the seat. The seat force would then be:

Force exerted by the seat = Weight - Centrifugal force

Force exerted by the seat = 678 - (4 * 92)

Force exerted by the seat (highest point)  = 310 N

(c) The force exerted by the seat at the lowest point will be the centrifugal force plus the weight.

This is:

Force exerted by seat = Centrifugal force + Weight

Force exerted by seat = (4 * 92) + 678

Force exerted by seat (lowest point) = 1046 N

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3 years ago
If there was a natural disaster and the people that were in this disaster were supposed to be there. There were 3 people in the
Bond [772]
A thunder bolt and lightning strike wouldn't do anyone any favours and might well account for the mess and the broken windows ...
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3 years ago
HELP!!! 20 POINTS!! TRUE OR FALSE??
ki77a [65]

Answer:

It might be true

Explanation:

6 0
3 years ago
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