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Pavel [41]
3 years ago
10

Describe three clues that tell you that you are o serving a chemical change. Give an Example of each clues you described.

Physics
1 answer:
sergiy2304 [10]3 years ago
3 0

1) the object would change color (start to rust or just chnage color)

2) The new substance is ireversable (cant chnage back to original form)

3)theres gas formations (its can change into a gas property)

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We can block light by placing obstacles in its path, but it’s much more difficult to block sound. Why?
olganol [36]
It's harder to block sound because sound waves and transverse waves, causing the sound to bounce off objects. This isn't the same with light. Hope that helps. 
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3 years ago
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the candle had 350 J of energy in the chemical store. As it burned, 250 J was transferred by lighting to the surrounding​
Elan Coil [88]

Answer:

Efficiency = 71%

Explanation:

Given the following data:

Output energy = 250 Joules

Input energy = 350 Joules

To find efficiency;

Efficiency = \frac {Out-put \; energy}{In-put \; energy} * 100

Substituting into the equation, we have;

Efficiency = \frac {250}{350} * 100

Efficiency = 0.7143 * 100

Efficiency = 71.43 ≈ 71%

Therefore, the efficiency of the candle is 71 percent.

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3 years ago
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Lelechka [254]
What..?

4x+5=13
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7 0
2 years ago
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What is the velocity of an 80 kg person skating across the ice with a kinetic energy of 16, 000 joules?
marysya [2.9K]

Answer:

V = 20 m/s

Explanation:

Given the following data;

Mass = 80kg

Kinetic energy = 16,000 joules

To find the velocity;

Kinetic energy can be defined as an energy possessed by an object or body due to its motion.

Mathematically, kinetic energy is given by the formula;

K.E = \frac{1}{2}MV^{2}

Where;

K.E represents kinetic energy measured in Joules.

M represents mass measured in kilograms.

V represents velocity measured in metres per seconds square.

Substituting into the formula, we have;

16000 = ½*80*V²

16000 = 40V²

V² = 16000/40

V² = 400

Taking the square root of both sides, we have;

V = 20 m/s

3 0
3 years ago
Which describes an object’s velocity that changes by the same amount each second?
Grace [21]
The answer is constant acceleration.
7 0
2 years ago
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