Compare contrast speed and velocity

Answers

Answer 1

Answer:
"Speed" is the rate at which distance is being covered .... the ratio
of distance covered to the time it takes.

"Velocity" is the rate at which distance is being covered .... the ratio
of distance covered to the time it takes ... AND the direction in which
it is covered. 'Speed' with the direction of the motion.

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a wave in the ocean has an amplitude of 3m. Winds pick up suddenly, increasing the wave's amplitude to 6m. How does this change in amplitude affect the wave's frequency and the amount of energy it transports

Answers

Answer

Hi,

An increase in amplitude from 3m to 6 m increases the energy it transports. The frequency of the wave is not affected

Explanation

Amplitude is the height of a wave where as frequency is the number of waves that pass by each second. A wave with bigger amplitude has more energy than a wave with smaller amplitude. A point where more waves pass contains more energy that is transferred every second. The change in the amplitude of a wave does not change its frequency. However, frequency is inversely related to the wavelength of a wave.

Best Wishes!

What two motions do all planets have?

Answers

Answer:

The two planetary movements are revolution and rotation.

Explanation:

In the vast solar system, planets traverse while also remaining fixated within the system because of gravity. Each planet is unique and so is its movement, but, at the same time, there are two common types of movements.

Answer: revolution and rotation plz mark as brainliest

Explanation:

Which of these elements is least likely to react with other elements A. calcium 
B. Argon 
C. sodium 
D. Nitrogen 
E. Oxygen 
F. Chlorine

Answers

B. Argon because it is a noble gas and has 8 valence electrons. Noble gases are very very stable and rarely react with other elements.

A 75 kg baseball player runs at a velocity of 6 m/s before sliding to a stop at second base. a. What is the kinetic energy of the runner before he begins his slide? b. What is the kinetic energy of the runner once he reaches the base? c. What is the change in the kinetic energy of the runner? d. How much work is done by friction in stopping the runner? e. If the runner slides for 2 m, what is the force of friction that acts upon him?

Answers

Answer:

a. $\displaystyle k_o=1350\ J$

b. $\displaystyle k_1=0\ J$

c. $\Delta k=-1350\ J$

d. $W=-1350\ J$

e. $F=-675\ N$

Explanation:

Work and Kinetic Energy

When an object moves at a certain velocity v0 and changes it to v1, a change in its kinetic energy is achieved:

$\Delta k=k_1-k_0$

Knowing that

$\displaystyle k=(mv^2)/(2)$

We have

$\displaystyle \Delta k=(mv_1^2)/(2)-(mv_0^2)/(2)$

The work done by the force who caused the change of velocity (acceleration) is

$\displaystyle W=(mv_1^2)/(2)-(mv_0^2)/(2)$

If we know the distance x traveled by the object, the work can also be calculated by

$W=F.x$

Being F the force responsible for the change of velocity

The 75 kg baseball player has an initial velocity of 6 m/s, then he slides and stops

a. Before the slide, his initial kinetic energy is

$\displaystyle k_o=(mv_0^2)/(2)$

$\displaystyle k_o=((75)6^2)/(2)$

$\boxed{\displaystyle k_o=1350\ J}$

b. Once he reaches the base, the player is at rest, thus his final kinetic energy is

$\displaystyle k_1=((75)0^2)/(2)$

$\boxed{\displaystyle k_1=0\ J}$

c. The change of kinetic energy is

$\Delta k=k_1-k_0=0\ J-1350\ J$

$\boxed{\Delta k=-1350\ J}$

d. The work done by friction to stop the player is

$W=\Delta k=k_1-k_0$

$\boxed{W=-1350\ J}$

e. We compute the force of friction by using

$W=F.x$

and solving for x

$\displaystyle F=(W)/(x)$

$\displaystyle F=(-1350\ J)/(2\ m)$

$\boxed{F=-675\ N}$

The negative sign indicates the force is against movement

Which of the following is NOT a pur substance A.) milk B.) oxygen C.) water D.) carbon dioxide

Answers

Answer:

milk

Explanation:

it is not a pure substance

milk does is a colloid

oxygen is an element and H20 and CO2 are compounds so they are pure

Which of the following is true statement about isotopes?A.
The number of protons always equals the number of neutrons in all isotopes.

B.
The number of protons never equals the number of neutrons in an isotope.

C.
Different isotopes for the same element will always have the same numbers of neutrons.

D.
Different isotopes for the same element always have the same number of protons.

Answers

Answer:

D. different isotopes for the same element will always have the same numbers of neutrons.

Explanation:

An isotope is the different variant of an element that has different number of neutron. There are various elements found in nature that have different isotopes.

Number of neutrons present in atom is different for the same element which makes the mass of one isotope different from the another.

Example of such isotope : Isotope of hydrogen are Protium, Deuterium and Tritium.

Final answer:

Different isotopes for the same element will always have the same numbers of neutrons.

Explanation:

The correct statement about isotopes is C. Different isotopes for the same element will always have the same numbers of neutrons. Isotopes are variants of an element that have the same number of protons but different numbers of neutrons. The number of protons in an element determines its atomic number, whereas the sum of protons and neutrons determines its atomic mass. So, while isotopes of the same element have the same number of protons, they can have different numbers of neutrons.

Learn more about Isotopes here:

brainly.com/question/27475737

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