PHYSICS HIGH SCHOOL

What are the factors on which pressure of liquids depends??

Answers

Answer 1
Answer: The pressure inside a liquid depends on the depth and the liquid's density.

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Groups of students are measuring the masses of several rocks. They have a scale that can show readings in pounds or kilograms. The teacher requires that they all make their measurements in kilograms.Why would the teacher make a decision like this?

Choose 1 answer:

(Choice A) A kilogram is larger than a pound, so the scale could measure more massive rocks.

(Choice B) Accurate measurements cannot be made in pounds.

(Choice C) Pounds cannot be converted to kilograms.

(Choice D) It is easier to compare measurements when using the same unit system.

Answers

Answer:

(D). It is easier to compare measurements when using the same unit system.

Explanation:

Kilograms are the standard unit of mass in the metric system, while pounds are the standard unit of mass in the imperial system.

The two systems are not directly convertible, so it would be difficult to compare measurements made in different units.

Therefore, the teacher requires that the students make their measurements in kilograms to simplify the comparison of their results.

So, answer (D). It is easier to compare measurements when using the same unit system.

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Let's see the other option:

  • Choice (A) is incorrect because a kilogram is not larger than a pound. A kilogram is equal to about 2.2 pounds.
  • Choice (B) is incorrect because accurate measurements can be made in pounds.
  • Choice (C) is incorrect because pounds can be converted to kilograms. The conversion factor is 1 kilogram = 2.2 pounds.

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Answer:

Choice D

Explanation:

The correct answer is (Choice D) It is easier to compare measurements when using the same unit system.

When conducting scientific experiments or measurements, it is crucial to maintain uniformity in the units of measurement to facilitate accurate comparisons and analysis. By requiring all students to measure the masses of rocks in kilograms, the teacher ensures consistency and eliminates any potential confusion that may arise from using different unit systems.

Using the same unit system allows for straightforward comparisons and calculations without the need for converting between units. It simplifies data analysis and interpretation, which is crucial for scientific accuracy and understanding. By standardizing the unit of measurement to kilograms, the students can directly compare the masses of rocks and draw meaningful conclusions from their data.

The formula for calculating potential energy is: A) Weight × vertical distance B) Force × displacement C) Weight / vertical distance D) Force / displacement

Answers

Pe = Mgh
So knowing this formula it will be vertical distance times weight aka answer A

Can you put hot water in a insulated gatorade cooler

Answers

You can put hot water in a insulated Gatorade cooler. This is correct.

What is insulation?

Insulation is the phenomenon in which the heat is blocked to flow out of the control volume.

Given is aGatorade cooler that is insulated. The insulation will not let any heat to pass to the cooler.

But pouring hot water may damage the plastic body of the cooler.

So, the cooler efficiency will have no effect.

Thus, yes, we can put hot water on insulated Gatorade cooler.

Learn more about insulation.

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Which statement is true concerning the evidence for black holes?Scientists can see black holes with powerful telescopes.

Scientists can see the effect of black holes on nearby stars.

Scientists can see trails left in space by black holes.

There is no evidence for black holes.

Answers

Scientists can see the effect of black holes on nearby stars is true concerning the evidence for black holes.

A piston exerts a force of 2,500 newtons on liquid in a cylindrical container. If the pressure on the top of the liquid is 12.5 kilopascals, find the area of the surface of the liquid, in square meters. ? please help

Answers

Here are the choices.

A. 200 m 
B. 31.25 m 
C. 0.2 m 
D. 5 m 

Pa = N/m² 
m² = N/Pa 

12.5 kPa = 12500 Pa 

m² = N/Pa 
m² = 2500 / 12500 
m² = 0.2 

C. 0.2 m²

So the correct answer is 0.2m^2

Suppose a yo-yo has a center shaft that has a 0.230 cm radius and that its string is being pulled.(a) If the string is stationary and the yo-yo accelerates away from it at a rate of 1.80 m/s2, what is the angular acceleration of the yo-yo in rad/s2? rad/s2.
(b) What is the angular velocity in rad/s after 0.750 s if it starts from rest? rad/s.
(c) The outside radius of the yo-yo is 3.10 cm.What is the tangential acceleration in m/s2 of a point on its edge? m/s2

Answers

Answer:

Part a)

\alpha = 782.6 rad/s^2

Part B)

\omega = 587 rad/s

Part c)

a_t = 24.3 m/s^2

Explanation:

Part a)

As we know that

a = R \alpha

so we will have

a = 1.80 m/s^2

R = 0.230 cm

\alpha = (a)/(R)

\alpha = (1.80)/(0.230 * 10^(-2))

\alpha = 782.6 rad/s^2

Part B)

Angular speed of the yo-yo

\omega = \alpha t

so we have

\omega = 782.6 * 0.750

\omega = 587 rad/s

Part c)

Tangential acceleration is given as

a_t = R \alpha

a_t = (3.10 * 10^(-2))(782.6)

a_t = 24.3 m/s^2
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