PHYSICS HIGH SCHOOL

When you add heat to wood it burns. The cellulose that makes up wood is converted to carbon dioxide, water vapor, and ash. This transfer of energy caused a change to the _____ of wood. chemical properties



physical properties



internal properties

Answers

Answer 1
Answer: Burning is a chemical change, and this changed the chemical properties of the wood. Indicators that  chemical change has taken place are fizzing, energy being given off or color changes.
Answer 2
Answer:

Chemical properties.........

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Why is chlorine bonded by a single covalent bond, but Oxygen bonded by a double covalent bond?

Answers

Answer:

chlorine is a non-metal.

Explanation:

a chlorine atom has 7 electrons in its outer shell. chlorine is in group 7 of the periodic table. two chlorine atoms will each share one electron to get a full outer shell and form a stable cl2 molecule.

When you run around a track at 5 km/h, your velocity is constant.

Answers

No it isn't.  Speed and direction are both components of velocity. 
When you run around the track at 5 km/hr, although your speed is
constant, your direction keeps changing, so your velocity does too.

8. John has to hit a bottle with a ball to win a prize. He throws a 0.4 kg ball with a velocity of 18 m/s. It hits a 0.2 kg bottle, and the bottle flies forward at 25 m/s. How fast is the ball traveling after hitting the bottle?

Answers

Answer: The velocity of the ball the ball after collision is 5.5 m/s.

Explanation:

John hitting the bottle which is at rest means this is an Elastic collision.

Mass of the ball= M_1=0.4 kg

Velocity of ball before collision = U_1=18m/s

Velocity of ball after collision =V_1

Mass of the bottle= M_2=0.2 kg

Velocity of bottle before collision = U_2=0 m/s(bottle is at at rest)

Velocity of bottle after collision =V_2=25 m/s

M_1V_1+M_2V_2=M_1U_1+M_2U_2

V_1=((0.4 kg* 18 m/s+0.2 kg* 0m/s)-0.2 kg* 25m/s)/(0.4)

V_1=5.5 m/s

The velocity of the ball the ball after collision is 5.5 m/s.
I hope it helped you.

What form of energy transforms to what other form when you turn on a steam iron?

Answers

Electrical to heat
Electricity is going into it and heat is coming out

Answer:

Electrical energy to thermal energy.

Plato

What kind of image is formed by an object that is placed beyond the center of curvature on the principal axis of a concave mirror?A.
real, inverted, the same size as the object, and at the same distance as the object
B.
real, inverted, larger than the object, and farther from the mirror than the object
C.
virtual, upright, left-right reversal, the same size as the object, and at the same distance as the object
D.
real, inverted, smaller than the object, and closer to the mirror than the object
E.
virtual, upright, larger than the object, and farther from the mirror than the object

Answers

Answer:D.

Real, inverted, smaller than the object, and closer to the mirror than the object

Explanation: Real images will be inverted. As it is beyond the centre of curvature it is also beyond 2F which means that the image is inside the centre of curvature ( between F and 2F from the mirror ) As the image is closer to the mirror than the object it must be diminished in size

An equinox occurs whena. neither end of Earth’s axis is tilted toward or away from the sun.
b. the north end of Earth’s axis is tilted away from the sun.
c. the north end of Earth’s axis is tilted toward the sun.
d. Earth’s axis is parallel to the sun’s rays.

Answers

Answer: The correct answer is Option a.

Explanation:

An equinox is defined as an event that occurs when Sun's rays fall on the equator at noon and at an angle of 90°.

The axis of rotation of Earth must be perpendicular to the Sun's rays for this event to occur.

If the axis is titled to some angle even, then equinox will not occur.

Hence, the correct answer is Option a.
A! Good luck on your test!
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