When evaporation occurs in a dish of water, the molecules left behind in the water: a) Are larger in size. b) Are more concentrated. c) Are less dense. d) Are transformed into gas.

Answers

Answer 1

Answer:

Answer:

b) Are more concentrated.

Explanation:

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A fastball pitcher can throw a baseball at a speed of 40 m/s (90 mi/h). (a) Assuming the pitcher can release the ball 16.7 m from home plate so the ball is moving horizontally, how long does it take the ball to reach home plate? (b) How far does the ball drop between the pitcher’s hand and home plate?

Answers

Answer:

a) 0.4175 seconds

b) 0.854 m

Explanation:

t = Time taken

u = Initial velocity = 40 m/s in x direction

v = Final velocity

s = Displacement = 16.7 m

a = Acceleration due to gravity = 9.81 m/s²

a) Time = Distance / Speed

$\text{Time}=(16.7)/(40)=0.4175\ s$

Time taken by the ball to reach home plate is 0.4175 seconds

b) Here velocity will by taken in y direction will be 0

$s=ut+(1)/(2)at^2\n\Rightarrow s=0* 0.4175+(1)/(2)* 9.81* 0.4175^2\n\Rightarrow s=0.854\ m$

The ball drops by 0.854 m between the pitcher’s hand and home plate.

A 2000-kg car traveling at 40m/s hits a wall with a force of 40,000N and comes to a stop what was the impact time?A-0.5s
B-2s
C-400s
D-800s

Answers

Answer:

Option (B)

Explanation:

mass of car, m = 2000 kg, initial velocity of car, u = 40 m/s,

Force, F = 40,000 N, Final velocity, v = 0 m/s

Let the impact time be t.

By use of Newton's second law

F = m a

where, a be the acceleration and m be the mass.

40000 = 2000 x a

a = 20 m/s^2

Acceleration is negative because the car is stopped.

Use first equation of motion,

v = u + a x t

0 = 40 - 20 x t

t = 2 second

D- 800 s I think I did (40,000)(40)/2000 idk if this is the right answer

A standard light bulb emits light rays in _________ directions.

Answers

Omni-directional. It means all directional.

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.

What characteristics makes a substance a mineral?A. It is hard
B. It is organic
C. Its structure is crystal
D. Its a liquid, solid, or gas

Answers

Answer:c-its structure is crystal

Explanation:

A substance is called a mineral if it meets the following requirement

naturally occurring,

inorganic,

solid,

definite chemical composition,

ordered internal structure

So the definite answer is crystal structure because they have an ordered internal structure.

Hope it helps

Final answer:

A mineral is a naturally occurring, inorganic, solid substance with a specific chemical composition and a crystalline structure. Hardness may vary among minerals and they are not organic. They are solid under normal conditions on Earth.

Explanation:

A mineral is defined by several specific characteristics: it is naturally occurring, inorganic, solid, has a definite chemical composition, and has a ordered internal arrangement of atoms - structure typically crystalline in nature.

It is hard: Not all minerals are hard. The hardness of a mineral is determined by the Mohs scale. So, hardness is a characteristic but not a definition.
It is organic: This statement is untrue. Minerals are inorganic substances.
Its structure is crystal: This is true. Minerals have a crystalline structure due to the orderly, repeating pattern of their atoms.
It's a liquid, solid, or gas: This is partly correct. Minerals are solids under normal conditions on Earth.

Learn more about Mineral here:

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John’s mass is 91.2 kg, and Barbara’s is 51.9 kg. He is standing on the x axis at xJ = +9.99 m, while she is standing on the x axis at xB = +3.27 m. They switch positions. How far and in which direction does their center of mass move as a result of the switch?

Answers

Answer:

the center of gravity moves by 1.9 m towards the origin

Explanation:

from the question we are given the following

John's mass (Mj) = 91.2 kg

Barbara's mass (Mb) = 51.9 kg

John's location (Xj) = + 9.99 m

Barbara's location (Xb) = +3.27 m

center of mass (X) = ?

the center of mass is where the masses of John and Barbara is concentrated, and it is given by the formula below

X = ( ( Mj x Xj ) + ( Mb x Xb ) ) / (Mj + Mb)

X = ( ( 91.2 x 9.99 ) + ( 51.9 x 3.27 ) ) / ( 91.2 + 51.9 )

X = 7.6 m

now when they switch positions their locations now become

John's location (Xj) = + 3.27 m

Barbara's location (Xb) = +9.99 m

now putting their new locations into the formula

X = ( ( 91.2 x 3.27 ) + ( 51.9 x 9.99 ) ) / ( 91.2 + 51.9 )

X = 5.7 m

therefore the center of mass moves by

7.6 - 5.7 = 1.9 m

the center of gravity moves by 1.9 m towards the origin

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