PHYSICS MIDDLE SCHOOL

1. A venturi measures flow rate using a pressure comparison between the outside and inside of a pipe. a)True
b)False

2. An inflated balloon’s shape is determined by internal pressure and external atmospheric pressure.
a)True
b)False

Answers

Answer 1
Answer: 1. Answer b) False
A Venturi tube uses a the pressure measurement before and after a flow restrictor, both measurements inside the pipe.

2. Answer a) True
The pressure of a gas in a volume is equally distributed on the surface of the container. So in this case, inside the balloon the pressure will be equal on the entire surface, the push force will be the same everywere and the deformation will be the same => round shape. The same principle applies on the outside, the atmospheric pressure is equally distributed on the exterior of the balloon.

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HIGH SCHOOL

A tiny sphere carrying a charge of 6.5 μc sits in an electric field, at a point where the electric potential is 240 v. what is the sphere's potential energy

Answers

The potential energy of the sphere is calculated as

Data;

  • Charge = 6.5μc
  • electric potential = 240V

Potential Energy

The potential energy of the sphere is calculated using the formula of potential energy and it's given as

  • q = charge
  • v = voltage

Let's substitute the values and solve the problem.

The potential energy of the sphere is calculated as

Learn more on potential energy of a charge here;

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brainly.com/question/14980438

The electric potential energy of the sphere is given by:

where
q is the charge of the sphere
V is the potential of the electric field where the sphere is located.

The sphere in this problem has a charge of

while the potential is

Therefore, the electric potential energy of the sphere is

COLLEGE

What does each letter stand for in the formula p=v x i?

Answers

I only know P and V and P is pressure and V is volume 
MIDDLE SCHOOL

If two large ocean waves meet and they are in phase, an even bigger ocean wave will be created. a. True
b. False

Answers

If two large ocean waves meet a bigger one will be created. True
COLLEGE

Elyse is explaining to a friend that she will be conducting a scientific investigation. Her question is "How many leatherback sea turtles will migrate to their home beach on the eastern coast of Australia this season?" Elyse states her hypothesis is "1,200 leatherback sea turtles will migrate to their home beach on the eastern coast of Australia this season." For her procedure, she and a team of scientists will be observing and counting the number of turtles that land on the beach. What is unusual about the description of her scientific investigation?

Answers

The scientific investigation has  five basic steps and one feedback step: (1) to make an observation (2) to ask a question (3) hypothesize (4) predict and (5) make a new hypothesis based on the results.  What is unusual about the description of Elyse’s scientific investigation is she did not follow the basic steps. She should have done observation first before asking a question and forming a hypothesis. 

MIDDLE SCHOOL

Immediately upon reaching its lowest point, a falling pendulum bob has its greatest amount of _____ energy, which is _____ the initial amount of potential energy. A. heat; less than
B. heat; more than
C. kinetic; less than
D. kinetic; more than

Answers

c

Immediately upon reaching its lowest point, a falling pendulum bob has its greatest amount of kinetic energy, which is less than the initial amount of potential energy.

remember the law of energy there cannot be any more since it is using the potential energy to move

Answer:

C. kinetic; less than

Explanation:

HIGH SCHOOL

After days and days of work, a group of graduate students has finally measured the wavelengths of hundreds of lines in the spectrum of a distant star. If a number of the lines come from molecules such as titanium oxide, the star is likely to be of which spectral type________.

Answers

Answer:

Spectra type M

Explanation:

mass spectrum is simply an intensity vs. m/z (mass-to-charge ratio) plot representing a chemical analysis. Hence, the mass spectrum of a sample is a pattern representing the distribution of ions by mass (more correctly: mass-to-charge ratio) in a sample. It is usually acquired using an instrument called a mass spectrometer. Not all the mass spectra of a given substance are same.

MIDDLE SCHOOL

What is the gravitational potential energy of a 0.1 kg apple sitting on top of a 12.5 m flagpole? Note: GPE= mgh. m= mass, g= acceleration due to gravity (9.8 m/s^2), h= objects height above the ground.

Answers

GPE= mgh = 0.1 kg * 9.8 m/s^2  * 12.5m = 12.25 J
HIGH SCHOOL

A drunk guy walking on a narrow lane takes 8 steps forward and 6 steps backward and so on. Each step is 1m long and he requires 1 second to travel. The time that the drunk guy takes to fall in a pit 18m away from the starting point is


a) 18s
b) 126s
c) 78s
d) 62s

Answers

Answer: 126 secs

Explanation: he gains 2 steps every time and it takes 9 2 steps to reach 18 meters so what u do is take that 9 and multiply it to 14 (8+6) giving u ur answer of 126 secs.

COLLEGE

What type of pipe wrenches are designed for turning and holding where marrying is not objectionable?

Answers

The type of pipe wrenches that are designed for turning and holding where marrying is not objectionable is called the chain wrench. This tool has two serrated that are adjusted to grip the pipe. This is very useful for those objects where marrying is not objectionable since this can be adjusted for that purpose. 
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