Average velocity is different than average speed because calculating average velocity involves what?

Answers

Answer 1

Answer: Two things that aren't involved in speed: -- the straight-line distance between the start- and end- points. -- the direction from start-point to end-point.

Answer 2

Answer:

The correct answer to the question is: Direction

EXPLANATION:

The average velocity of a body is defined as the rate of change of displacement.

We know that displacement is a vector quantity. Hence, it has magnitude as well as direction for its specification.

On the other hand, the average speed of a body is defined as the rate of change of distance travelled. Hence, the average speed of a body is a scalar quantity. It means that it has only magnitude.

Hence, during the calculation of average velocity,we have to think of its direction.

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What is the velocity of an upward moving 500kg elevator that has 4000 of energy

Answers

Answer:

4 m/s

Step-by-Step Explanation:

E = mgh and h = E/mg

So if you put your numbers in the formula : h = 4000J/500 * 10

you will get h = 4/5 meters

use this , If the elevator moves from top to the ground in a constasnt acceleration you will have all energy (4000 J) transformed into acceleration to speed up its motion.

(All potential energy will be turned into movement energy). As explained in this formula;

mgh = mv²/2 , solve out (v) from the equation

v = √2gh = √2·10·4/5 (digits are together- not related to the problem, just for clarification) = 4 m/s

Answer the velocity of the elevator is

4 m/s

Explain Newton's third law in your own words.

Answers

Newton's third law states "for every action, there is an equal and opposite reaction."

What this is pretty much saying is that for every action, there is a consequence. One force connects and triggers another.

Newton's third law says, " For every action, there is an equal and opposite reaction."

The magnitude of action and reaction are equal but the direction is opposite.

During Mr. Nye's science class, students were expected to identify various substances using physical properties they could easily measure. Mr. Nye gave each of the five groups a green, metal cube. The students had to identify what metal the cube was made of. The length of each side was 3.0 cm and the mass was 270 grams. What property should Mr. Nye's science students use to identify the metal in the cubes?

A) color

B) density

C) mass

D) volume

Answers

Density is the best property to use, as while multiple different metals could create cubes with the same color, mass, or volume, no different metal could create a cube with the same mass and volume. Density is based on mass and volume, and as a result no two different metals will have the same density.

Hey there

The students should use density.

Which is larger an atom or a molecule

Answers

MOLECULE;
For example, a hydrogen atom forms one bond, an oxygen atom forms two, and carbon forms four bonds. Look at that molecule of water again - each hydrogen has one bond, and the oxygen in the middle has two bonds. Molecules can be much bigger.

The distribution of total body protein in healthy adult men is approximately Normal, with mean 12.3 kg and standard deviation 0.1 kg. If you take a random sample of 25 healthy adult men, what is the probability that their average total body protein is between 12.25 and 12.35 kg?

Answers

Answer:

$P(12.25\leq x \leq 12.35 ) = 0.9876$

Explanation:

given,

mean (μ) = 12.3 Kg

standard deviation (σ ) = 0.1

random sample = 25

probability between 12.25 and 12.35 kg

$P(12.25\leq x \leq 12.35 ) = P((12.35-12.3)/((0.1)/(√(n)))\leq z)- P((12.25-12.3)/((0.1)/(√(n)))\leq z)$

$P(12.25\leq x \leq 12.35 ) = P((12.35-12.3)/((0.1)/(√(25)))\leq z)- P((12.25-12.3)/((0.1)/(√(25)))\leq z)$

$P(12.25\leq x \leq 12.35 ) = P((12.35-12.3)/((0.1)/(5))\leq z)- P((12.25-12.3)/((0.1)/(5))\leq z)$

$P(12.25\leq x \leq 12.35 ) = P((5 (12.35-12.3))/(0.1)\leq z)- P((5(12.25-12.3))/(0.1)\leq z)$

$P(12.25\leq x \leq 12.35 ) = P(\frac{2.5\leq z)- P(-2.5\leq z)$

using z-table

$P(12.25\leq x \leq 12.35 ) = 0.9938 - 0.0062$

$P(12.25\leq x \leq 12.35 ) = 0.9876$

What determines the atomic mass of an element? A.
the sum of the neutrons and the electrons

B.
the sum of the protons and electrons

C.
the sum of the ions and isotopes

D.
the sum of the protons and the neutrons

Answers

D. protons + neutrons. Electrons have relatively small mass compared to them.

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