All categories

3 years ago

What is sedimentary rock?

Physics

2 answers:

velikii [3]3 years ago

7 0

They are pre-existing rocks or pieces of once-living organisms.

sp2606 [1]3 years ago

4 0

Sedimentary rocks are types of rock that are formed by the accumulation or deposition of mineral or organic particles at the Earth's surface, followed by cementation. Sedimentation is the collective name for processes that cause these particles to settle in place.

You might be interested in

6. If you you apply a force of 30 N to the left to and object and your friend applies a force of 20 N

BartSMP [9]

Answer:it’s 10N

Explanation:So 30N is going left and 20N is going right so you would subtract it because they are going opposite ways if they where going the same why then you would add them.

6 0

4 years ago

What are three key aerodynamics principles?

mafiozo [28]

Answer:

Explanation:

There are three basic forces in aerodynamics: acceleration, which moves an airplane forward; drag, which holds it back; and height, which keeps it airborne. Lift is generally explained by three theories: Bernoulli's principle, the Coanda effect, and Newton's third law of motion.

8 0

4 years ago

A thallium source with a half-life of 3.7 years was certified at 10 kBq 10 years ago. What is its activity now?

Murrr4er [49]

Answer:

the activity of thallium is 1.54 kBq .

Explanation:

given,

half life = 3.7 years

R₀ = 10 kBq

time = 10 years

$R = R_0\times e^(\dfrac{-0.693}{t_{1/2}}\times t)$

$R = 10\times e^(\dfrac{-0.693}{3.7}\times 10)$

R = 10 × (0.153667)

R = 1.5367 ≈ 1.54 kBq

hence, the activity of thallium is 1.54 kBq .

7 0

4 years ago

The height of a door is measured by four people and their measured values are 217.6 cm, 217.2 cm, 216.8 cm, and 217.9 cm. (a) Wh

Paul [167]

Answer:

a) To the nearest tenth the average value of the measures is 217.4cm

b) The standard deviation for the four measurements is 0.415

Explanation:

The average is the result of adding all the values and dividing by the number of measures, in this case 4 then

$Average = \frac{217.6 + 217.2 + 216.8 + 217.9}{4} \\$

$Average = \frac{869.5}{4} \\$

$Average = 217.375$

a) To the nearest tenth the average value of the measures is 217.4cm

The standard deviation equals to the square root of the variance, and the variance is the adition of all the square of the difference between the measure and the average for each value divided by the number of measurements

So first, we must calculate the variance:

$Variance = \frac{(217.6-217.4)^2+(217.2-217.4)^2+(216.8-217.4)^2+(217.9-217.4)^2}{4}$ .