Which scientific law states that matter cannot be created or destroyed?A. first law of nature
B. Newton's first law
C. universal gravitation
D. conservation of mass

Answers

Answer 1
Answer: D Conversation of mass

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PLEASE HELP ME How does electricity flow? from low potential to high potential from high potential to low potential from series circuit to parallel circuit from conductor to insulator

Answers

The correct answer of this question is : From high potential to low potential.

EXPLANATION :

Before going to answer this question, first we have to understand the conventional rule for current flow.

As per the conventional rule of electricity, the current direction is opposite to the direction of electronic motion.

The current flows through a conductor is due to the motion of the free electrons. When the conductor or wire is attached to any electric source, the electrons are drifted towards the positive terminal of the source. Hence, electrons are moving from negative terminal to positive terminal.

As per the conventional rule, the current direction will be from positive terminal towards negative terminal i.e from higher potential to lower potential.

Hence, the correct answer of this question is from higher potential to lower potential .

A 72-tooth gear is connected to a 12-tooth gear. If the large gear makes one complete turn, how many turnsdoes the small gear make?

Answers

You divide 72 by 12 to get 6.

In chemistry a 'system' is ___________________.A. The part of the universe that is being studied at the moment.
B. The entire universe.
C. All of these
D. Outside of the experiment, or reaction of interest.

Answers

Answer:

the awnser is A

Explanation:

the awnser is A

A skateboarder on a half-pipe changes his velocity from 6.0 m/s forwards to 4.0 m/s backward in 5.0 s. What is the acceleration of the skateboarder?

Answers

the change in velocity is 10 m/s in 5 seconds.

sinces a = change in velocity/time

a= 10/5

a=2

Question 17 ListenA blue lab cart is traveling west on a track when it collides with and sticks to a red lab cart traveling east. The magnitude of the momentum of the blue cart before the collision is 2.0 kilogram • meters per second, and the magnitude of the momentum of the red cart before the collision is 3.0 kilogram • meters per second. The magnitude of the total momentum of the two carts after the collision is1.0 kg • m/s2.0 kg • m/s3.0 kg • m/s5.0 kg • m/s

Answers

Answer:

option A

Explanation:

given,

momentum of blue car in west direction = Pa = 2 kg.m/s

momentum of red cart in east direction = Pb = 3 kg.m/s

total momentum of the two cart = ?

Pa = 2 Kg.m/s

Pb = -3 kg.m/s

Total momentum

P = Pa + Pb

P = 2  - 3

P = - 1 kg.m/s

hence, the total momentum of the two carts after the collision is 1.0 kg•m/s

The correct answer is option A

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Answers

Answer:

Stimulants are a group of drugs that result in increased activity in the body. Sometimes referred to as “uppers,” these drugs are frequently abused due to their performance-enhancing and euphoric effects. Generally, those who abuse stimulants experience heightened energy levels and enhanced focus.

Stimulants speed up mental and physical processes, which can produce desirable effects in the short-term by increasing levels of dopamine in the brain. While users may feel great due to the short-term effects of stimulants, long-term abuse of these drugs can have significant consequences, which is why it is so important for those who abuse the drugs to get help as quickly as possible.

Explanation:

hope this works

I love how they said random stuff and than a response about drugs