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Nostrana [21]
3 years ago
8

When determining if a change to matter is physical or chemical, you would observe key indicators to use as clues. What is the mo

st correct explanation that a physical change has occurred?
a.fireworks exploding, because energy is released as light and heat
b.gasoline burning, because it forms water vapor and carbon dioxide
c.crushing an ice cube, because the chemical structure of the ice cube is changed
d.dicing potatoes, because the molecules are separated but remain the same substa
Physics
2 answers:
Alex73 [517]3 years ago
6 0
D. A physical change means that the object can be broken into different pieces, but it still remains that same object.
zhannawk [14.2K]3 years ago
4 0

Answer:

D

Explanation:

Even after being cut, the potatoes are still potatoes

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A baseball is hit so that it travels straight upward after being struck by the bat. A fan observes that it takes 3.00 s for the
Temka [501]

Answer:

initial velocity is0m/s and final velocity is29.4m/s

6 0
3 years ago
A student performs experiements on acids and bases. What is not a scientific experiment
seraphim [82]
The answer you are looking for would be C. "She asks her lab partner which base he thinks is hardest to study" 

This is the correct option out of the other choices. 
A. She uses a acid-base indicator to measure the pH of four different solutions 
B. She mixes two solutions and measures their pH before and after 
C. She asks her lab partner which base he thinks is the hardest to study
D. She measures the temperature of a solution before and after adding H2SO4
7 0
3 years ago
In building a particle accelerator, you manage to produce a uniform electric field of magnitude 6.03 × 10 5 N/C in one 35.5 cm s
mamaluj [8]

Answer:

V = 2.14×10⁵ V.

W = 3.424×10⁻¹⁴ J.

Explanation:

Electric Potential: This can be defined as the work done in bringing  a unit positive charge from infinity to that point, against the action of a field.

The S.I unit is V.

The expression containing electric potential, distance and electric field is given as,

V = E×r .............. Equation 1

Where V = Electric potential difference across the length of the accelerator's section, E = Electric Field, r = Length of the section.

Given: E = 6.03×10⁵ N/C, r = 35.5 cm = 0.355 m.

Substitute into equation 1

V = 6.03×10⁵×0.355

V = 2.14065×10⁵ V.

V ≈  2.14×10⁵ V.

amount of Work required to move a proton through the section is given as,

W = qV ............... Equation 2

Where W = work required to move a proton through the section, q = charge on a proton V = Electric potential.

Given: V = 2.14×10⁵ V, q = 1.60 x 10⁻¹⁹ C.

Substitute into equation 2

W = (2.14×10⁵)(1.60 x 10⁻¹⁹)

W = 3.424×10⁻¹⁴ J.

6 0
3 years ago
At what angle should the axes of two polaroids be placed so as to reduce the intensity of the incident unpolarized light to 13.
prohojiy [21]

Answer:

θ = 66.90°

Explanation:

we know that

I= \frac{I_0}{2}cos^2\theta

I= intensity of polarized light =1

I_o= intensity of unpolarized light = 13

putting vales we get

1= \frac{13}{2}cos^2\theta

⇒\theta=cos^{-1} \sqrt{\frac{1}{6.5} }

therefore θ = 66.90°

5 0
3 years ago
What is the mathematical relationship between voltage (V), resistance (R), and current (I)? Express your answer as an equation:
Lemur [1.5K]
V=IR
I=V/R
R=V/I
these are the realations of voltage ,resistance , and current .
3 0
4 years ago
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