PHYSICS HIGH SCHOOL

What is the pressure exerted by a column of water 80 cm high ?

Answers

Answer 1

Answer:

Answer:

$P=7,840\ Pa$

Explanation:

Pressure Exerted by a Column of Liquid

The pressure P exerted by a column of liquid of height h and density ρ is given by the hydrostatic pressure equation:

P = ρgh

Where ρ is the density of the liquid, g is the acceleration of gravity g=9.8m/s^2, and h is the height of the column of liquid.

The data provided is as follows:

$\rho=1000\ Kg/m^3$

$g=9.8m/s^2$

$h=80\ cm = 0.8\ m$

The pressure is:

$P = 1000\ Kg/m^3\cdot 9.8\ m/s^2 \cdot 0.8\ m$

$\boxed{P=7,840\ Pa}$

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a race car is traveling at a speed of 80.0m/s on a circular race track of radius 450m what is the centripetal acceleration
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How does the electric potential energy between two charged particles change if one particle's charge is increased by a factor of 2?

Answers

Answer:

Magnitude of potential energy is increased by factor "2"

Explanation:

As we know that if two charge particles are placed at some distance "r" from each other then the electrostatic potential energy between two charge particles is given as

$U = (kq_1q_2)/(r)$

now we know that if the charge of one of the charge particle is increased to twice of initial charge then

$U' = (kq_1(2q_2))/(r)$

now we can say from above two equations that

$U' = 2U$

so on increase one of the charge to twice of initial value then the potential energy will become TWICE

from the formula of electric potential = (1/4πe)*(Qq/r), if one of the charge is doubled, the electric potential energy would be doubled too. Not so sure though, u might wanna double-check with someone else. But hope that helps. :)

Microorganisms that occur or have adapted to live in a specific environment are called a. fomites. b. droplets. c. pathogen. d. flora.

Answers

The microorganism that occurs or has adapted to live in a specific environment is called D. Flora. Normal Flora or Flora lives inside the body without harming the person. They are mostly found in the large intestine. I hope you find this helpful.

Acceleration occurs whenever an ___________________ force acts on an object.

Answers

Acceleration occurs whenever the forces on an object are unbalanced.

It's the group of forces on the object that's either balanced or unbalanced.
There's no such thing as "an unbalanced force".

Acceleration is known to occur whenever an unbalanced force acts on an object.

Technician A says that an oxygen sensor can have one, two, three, four, or more wires, depending on the style and design. Technician B says that if the exhaust has little oxygen, the voltage of the oxygen sensor will be close to 1 volt (1000 mV) and close to zero if there is high oxygen content in the exhaust. Who is right?

Answers

Answer:

Both technicians A and B are right.

Explanation:

-The most common application is to measure the exhaust-gas concentration of oxygen.The probe typically has four wires attached to it: two for the lambda output, and two. The number of wires depends on design and style.

-An oxygen sensor will typically generate up to about 0.9 volts( $\approx 1.0V$ ) when the fuel mixture is rich and there is little unburned oxygen in the exhaust. When the mixture is lean, the sensor's output voltage will drop down to about 0.1( $\approx 0.0V$ )volts

a ball is dropped from rest at a height of 80 m above the ground. what is the speed just as it hits the ground?

Answers

Δx=Vi(t)+.5at²
Δx=80
a=9.8
Vi=0 since its from rest, the initial velocity is 0.
80=0+.5(9.8)t²
t=16.33
You can use one of the big five equations: Vf=Vi+at
Vf=0+9.8(16.33)
Vf=160.034 m/s

Which one of the following choices best describes an advantage of isometric exercise? A. Rapid strength improvement
B. Improved strength across the entire range of motion
C. Improved joint flexibility
D. Motivational

Answers

Answer: C. Improved joint flexibility

Explanation:

Isometric exercises are the exercises which involves the contraction of particular muscles or group of muscles. In these exercises the muscles do not change their length and the joints does not move. These are the exercises which are done in one position. These exercises are performed in order to obtain strength during training exercises during which the muscle length and joint angles do not basically change. These exercises are high intensity exercises and contributes to the building of muscles and burning of fat.

On the basis of the above information, A. Rapid strength improvement is the correct option.

Final answer:

The primary advantage of isometric exercise is rapid strength improvement in a specific area, not necessarily improved flexibility or range of motion.

Explanation:

The best answer that describes an advantage of isometric exercise is A. Rapid strength improvement. Isometric exercises are often used for rehabilitation and building strength, as they involve the contraction of a specific set of muscles in a static position. This type of exercise does not involve the muscle changing length or the joint angle changing, which allows for an increase in strength in a very focused manner.

This does not necessarily mean that isometric exercises enhance joint flexibility (C) or improve strength across the entire range of motion (B) as the movement is static. The motivation aspect (D) can differ from person to person, but it's not a direct physical benefit of isometric exercises.