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Juliette [100K]
3 years ago
7

Use the drop-down menus to complete the statements. are pure substances that cannot be broken down into a simpler form. are unit

s of two or more atoms. are the smallest possible particles of an element. are pure substances made of two or more atoms of different elements.
Physics
1 answer:
Vika [28.1K]3 years ago
3 0

Answer: Please see below

Explanation:

Are pure substances that cannot be broken down into a simpler form---- Element

are units of two or more atoms---- Molecule

are the smallest possible particles of an element---- an Atom

are pure substances made of two or more atoms of different elements---- Compound

An atom is the smallest unit of  matter that consists of protons, neutrons and electrons. Eg the element, helium, contains atoms with two protons in the nucleus.

Eg of element, we have carbon, hydrogen, helium

Eg of a compound--- Ammonia

Eg of a molecule-----H2O (water),C6H12O6 (glucose)

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Nata [24]

Answer:

reactants --> products + thermal energy

Explanation:

Heat is absorbed in endothermic reaction.

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Which of the following is true regarding the Earth's mantle?
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B) It’s material moves due to convection currents.
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A car’s bumper is designed to withstand a 4.0-km/h (1.1-m/s) collision with an immovable object without damage to the body of th
Alex Ar [27]

Answer:

 avriage force F = 2722.5 N

Explanation:

For this problem we can use Newton's second law, to calculate the average force and acceleration we can find it by kinematics.

      vf² = v₀² - 2 ax

The final carriage speed is zero (vf = 0)

      0 = v₀² - 2ax

      a = v₀² / 2x

      a = 1.1²/(2 0.200)

      a = 3.025 m / s²

      a = 3.0 m/s²

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3 0
3 years ago
A baseball pitcher throws a ball horizontally at a speed of 34.0 m/s. A catcher is 18.6 m away from the pitcher. Find the magnit
Sidana [21]

To develop this problem, it is necessary to apply the concepts related to the description of the movement through the kinematic trajectory equations, which include displacement, velocity and acceleration.

The trajectory equation from the motion kinematic equations is given by

y = \frac{1}{2} at^2+v_0t+y_0

Where,

a = acceleration

t = time

v_0 = Initial velocity

y_0 = initial position

In addition to this we know that speed, speed is the change of position in relation to time. So

v = \frac{x}{t}

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With the data we have we can find the time as well

v = \frac{x}{t}

t = \frac{x}{v}

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With the equation of motion and considering that we have no initial position, that the initial velocity is also zero then and that the acceleration is gravity,

y = \frac{1}{2} at^2+v_0t+y_0

y = \frac{1}{2} gt^2+0+0

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y = \frac{1}{2} 9.8*0.547^2

y = 1.46m

Therefore the vertical distance that the ball drops as it moves from the pitcher to the catcher is 1.46m.

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3 years ago
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