Answer:
A) Sodium loses a negative electron when forming chemical bonds.
Explanation:
Sodium always has exactly 11 protons.
When sodium (a metal) reacts with chlorine (a nonmetal), it forms an ionic bond, meaning it loses an electron.
The shaft is 78m approximately deep. The correct option is D which is 78 meters
<h3>
What are Sound Waves ?</h3>
Sound waves are longitudinal. That is, the direction of the waves is parallel to the direction of its propagation of particles.
Given that a boy finds an abandoned mine shaft in the woods, and wants to know how deep the hole is. He drops in a stone, and counts 4 seconds before he hears the "plunk" of the stone hitting the bottom of the shaft.
- The speed of the sound V = 330m/s
- The time it takes the sound to reach the top = t
Speed V = distance / time
330 = h/t
Make t the subject of formula
t = h/330
As the stone is dropped, initial velocity = 0, Using the formula
h = 1/2gT²
But T = 4 - t
T = 4 approximately
Substitute all the parameters
h = 1/2 × 9.8 × (4)²
h = 4.9 × (16)
h = 78.4m
Therefore, the shaft is 78m approximately deep. The correct option is D which is 78 meters
Learn more about sound wave here: brainly.com/question/16093793
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easy, The fuel is ignited
Answer:
positive acceleration: releasing an object from a height - acceleration due to the force of gravity, the speed of the object will increase as it falls
negative acceleration: applying breaks on the tires to slow down the car - deceleration due to frictional forces
Answer:
7506 cal
Explanation:
Given: Mass of water = m = 13.9 grams.
Heat energy required to determine the conversion of 13.9 grams of water to steam or vapor is m L,
where L = Latent heat of vaporization of water=540 cal/g.
Q = mL = (13.9)(540) = 7,506 cal.