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sammy [17]
3 years ago
15

An experiment was performed to determine how the amount of coffee grounds could affect the taste of coffee. The same kind of cof

fee, the same coffee pot, the same amount and type of water, the same cook time, and the same electrical sources were used (what is IV, DV, and one Control) *
Physics
1 answer:
Andru [333]3 years ago
7 0

Answer: Independent variable: The amount of coffee grounds.

Dependent variable: The taste of the coffee.

Controlled variables: The kind of coffee, the same percolator, the same amount and type of water, the same perking time, and the same electrical sources.

Explanation: In an experiment the independent variable is the variable that you change, the dependent variable is the variable that you are testing to see if it will change because of the change you made, and the controlled variables are the variables that stay the same.

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Researchers have found that the larvae of all North American firefly species glow as a warning sign to ward off predators. Howev
Marrrta [24]

Explanation:

The theory of speciation confirms what happens with fireflies, only fireflies that are part of the same species can reproduce among themselves, which means that fireflies that use pheromones as mating signals will attract fireflies that use that same form or mechanism of reproduction.

Some mechanisms that allow this type of differentiation or speciation to occur are: seasonal or geographic isolation and sexual isolation due to behavior or conduct.

Speciation allows the formation of new populations of organisms that share the same physiological and genetic characteristics. Therefore, the adult fireflies that shine as a mating signal are possibly found in the same geographical position and their physiological and genetic characteristics are compatible with those of his own species.

7 0
3 years ago
A ball is thrown downward with an initial speed of 7 m / s. The ball's velocity after 3 seconds is m / s. (g = -9.8m / s²)
yan [13]

Answer:

-36.4 m/s

Explanation:

final velocity= initial velocity + acceleration x time

7 + (-9.8)(3)= -36.4 m/s

5 0
3 years ago
Analogy: atom is to element as ____ is to compound
Masja [62]
Molecule is the answer to what you are looking for

5 0
4 years ago
A chef places an open sack of flour on a kitchen scale. The scale reading of
Novay_Z [31]

Answer:

Explanation:

Given

Initial reading on scale =40 N

So, we can conclude that weight of the sack is 40 N

After this a 10 N force is applied upward on the sack such that the net force becomes (40-10) N downward (because downward force is more)

This net downward force is the resultant of earth graviational pull and the applied upward force.

So, this downward force acts on the machine which inturn applies an upaward force of same magnitude called Normal reaction.

This situation can be diagramatically represented by figure given below  

4 0
3 years ago
620 J of heat is added to the cylinder of an engine, which causes the gas inside to expand. As a result, the piston of the engin
Maru [420]

Answer:

<u>400</u> J work is done BY the engine.

The internal energy of the gas is <u>620</u> J

Explanation:

The given information are;

The heat added to the cylinder = 620 J

The force applied by the piston of the engine = 8.0 kN = 8,000 N

The distance over which the force moves (the piston) = 5.0 cm = 0.05 m

The work done (by the engine) = Force × Distance = 8,000 N × 0.05 m = 400 J

The internal energy is the sum of the kinetic and potential energy of the system

Therefore, given that the internal energy, U, is the sum total of the energy in the system

∴ U = The heat supplied to the system = 620 J

Which gives;

<u>400</u> J work is done BY the engine.

The internal energy of the gas is <u>620</u> J.

6 0
3 years ago
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