Is it possible for a population with a high birth rate to decrease in size.

Answers

Answer 1

Answer: Sure, if the mortality (death) rate is even higher than the birth rate.

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Is potential difference is same in parallel series

Answers

-- The potential difference (voltage) is the same across all components
that are connected in parallel.

-- The current is the same through all components that are connected in series.

At a temperature of 280k, the gas in a cylinder has a volume of 20.0 liters.If the volume of the gas is decreased to 10.0 liters, what must the temperature be for the gas to remain at a constant pressure?

Answers

Answer:

T = 140 K

Explanation:

As we know by ideal gas law

$PV = nRT$

now if pressure of the gas is constant

then we will have

$V = (nR)/(P) T$

now we have

$V_1 = 20.0 litre$

$T_1 = 280 K$

$V_2 = 10.0 litre$

now from above equation

$(20.0)/(10.0) = (280)/(T)$

$T = 140 K$

Temperature should be 140k to maintain constant pressure

What happens to an earthquake's S-waves when they strike the core?A) They bounce off
B) They are absorbed
C) The change into P-waves
D) They change into L-waves

Answers

Answer:

B) They are absorbed

Explanation:

B is correct because S waves can only travel through solid materials. When they hit liquid materials they are absorbed in and undetectable.

Answer:

B) They are absorbed

Explanation:

When they hit the liquid core, S-waves are no longer able to be detected. While P-waves bounce off the liquid core, S-waves are absorbed at the core.

Ifyou left a board lying in the grass for a few days, what would happen to the
grass underneath the board? Why?

Answers

The grass would die (turn brown/yellow). This is because the grass has not received any sunlight. This means it cannot photosynthesise and make glucose (food) which it needs to survive.

Lead has a density of 11.3 g/cm3 and a mass of 282.5 g. What is its volume?

Answers

Well we know that density=mass divided by volume, so let's substitute :)

11.3=282.5/V

Now we know that 282.5 has to be divided by SOMETHING in order to get 11.3.

You can waste time trying every number under the sun, or you can use a little trick I learned in elementary school which is to divide 282.5 by 11.3. This works because it shows how many times 11.3 goes into 282.5 which is the volume of this "piece of" lead. Since 11.3 goes perfectly 25 times into 282.5, the Volume of this "piece of" lead is 25 cm³. :)

Under what condition is the instantaneous acceleration of a moving body equal to its average acceleration over time?A. only at positive accelerations

B. only at negative accelerations

C. only at zero acceleration

D. only at constant accelerations

Answers

If the acceleration is constant (negative or positive) the instantaneous acceleration cannot be

Average acceleration: [final velocity - initial velocity ] /Δ time

Instantaneous acceleration = d V / dt =slope of the velocity vs t graph

If acceleration is increasing, the slope of the curve at one moment will be higher than the average acceleration.

If acceleration is decreasing, the slope of the curve at one moment will be lower than the average acceleration.

If acceleration is constant, the acceleration at any moment is the same, then only at constant accelerations, the instantaneuos acceleration is the same than the average acceleration.

Constant zero acceleration is a particular case of constant acceleration, so at constant zero acceleration the instantaneous accelerations is the same than the average acceleration: zero. But, it is not true that only at zero acceleration the instantaneous acceleration is equal than the average acceleration.

That is why the only true option and the answer is the option D. only at constant accelerations.

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