Which of the following is not true regarding atmospheric pressure

Substance X is placed in a container with substance Y. Both substances are fluids. Substance X initially sinks to the bottom of

Brut [27]

Answer: Option (A) is the correct answer.

Explanation:

Convection is a process in which heat transfers from a hotter substance to a colder substance.

As a result, the substance which is less dense will rise and the more denser substance will sink due to the influence of gravity.

Thus, we can conclude that in the given situation substance X will rise due to convection.

3 0

4 years ago

Read 2 more answers

Which of the following occurs when the parasympathetic nervous system PNS is activated

Sphinxa [80]

<span>When the parasympathetic nervous system is activated the primary Vessels dilate and the HR decreases, muscles will relax and also the Blood shunts to organ of digestion. The autonomic nervous system is divided into two sections, the Sympathetic and the Parasympathetic. </span>

5 0

4 years ago

Alice drops a rock to a well. She hears the splash of the rock 4.1s later. The speed of sound is 340m/s. How deep is the well

Maksim231197 [3]

Answer:

697 m

Explanation:

From the question above,

Note: Alice hears the splash of the rock in the well through the help of echo.

Applying,

v = 2x/t........................ Equation 1

Where v = speed of sound, x = depth of the well, t = time.

make x the subject of the formula in equation 1

x = vt/2................... Equation 2.

Given: v = 340 m/s, t = 4.1 s

Substitute these values into equation 2

x = 340(4.1)/2

x = 697 m.

3 0

4 years ago

Two cars are lifted to the same elevation in a service station. If one car is twice as massive as the other, how do their potent

Ymorist [56]

Answer:

1. The car which is twice as massive as the other will have twice potential energy.

Explanation:

The potential energy of an object is given by:

$U=mgh$

where

m is the mass of the object

g is the gravitational acceleration

h is the height of the object measured to some reference level

In this problem, we have two cars at same elevation (= same h in the formula) but one car has twice the mass of the second car. Calling m the mass of one car and 2m the mass of the second car, we have:

- Potential energy of the first car:

$U=mgh$

- potential energy of the second car:

$U'=(2m)gh=2mgh=2U$

So, the car which is twice as massive as the other will have twice potential energy.

3 0

4 years ago

Calculate the magnitude of the force, in newtons, exerted by a boxing glove on an opponent’s face, if the glove and face togethe

saul85 [17]

Answer:

5437.5 N

Explanation:

from the question we are given the following:

mass = 7.25 kg

initial speed (u) = 10.5 $\frac{m}{s}$

finial velocity (v) = 0

compression (s) = -7.35 cm = -0.0735 m (the negative sign is because the face is compressed, so there is a decrease)

we know that force = mass x acceleration,

we have our mass but need to find the acceleration. we can get the acceleration by applying the formula below

$v^{2} = u^{2} + 2as$

therefore

0 = 10.5^{2} + (-2)× a × 0.0735[/tex]

a = $\frac{10.5^{2} }{ 2 × 0.0735$ }[/tex]

a = 750

from F = m x a

force = 7.25 x 750 = 5437.5 N

7 0

4 years ago