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3 years ago

Which statement about vectors is true?

Physics

2 answers:

ycow [4]3 years ago

4 0

Answer:

D. Vectors are quantities described by both magnitude and direction.

Explanation

elena-14-01-66 [18.8K]3 years ago

4 0

Answer: D magnitude and direction

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a lamp or bulb is marked 12 volt 240 Watts how many joules does it consume in one hour and what is the current that passes throu

valkas [14]

Answer:

1 watt is 1 Joule per second. 240 watt would then be 240 joules per second. How many seconds are there in an hour? Current formula is P= IV , P is 240(not the power in an hour because the current is calculated in seconds), and V is 12V. Then you will get I, the current.

5 0

3 years ago

Which action describes an experimental investigation?

EastWind [94]

I think the answer is c

3 0

3 years ago

A soap bubble usually pops because some part of it becomes too thin due to evaporation or drainage of fluid. The change in thick

Lapatulllka [165]

Answer:

To understand why the change in thickness also changes the color of light the bubble reflects, we definitely know that

mλ = dsinθ

when d sin θ = mλ, we expect constructive interference

d = distance between the slits

θ = the angle relative to the incident direction

m = order of the interference

Hence, a change in the thickness will also cause a change in the wavelength, and as wavelength changes, various colors are generated.

The light's path difference is therefore generated as a result of the thickness variation of the soap bubble.

Explanation:

To understand why the change in thickness also changes the color of light the bubble reflects, we definitely know that

mλ = dsinθ

when d sin θ = mλ, we expect constructive interference

d = distance between the slits

θ = the angle relative to the incident direction

m = order of the interference

Hence, a change in the thickness will also cause a change in the wavelength, and as wavelength changes, various colors are generated.

The light's path difference is therefore generated as a result of the thickness variation of the soap bubble.

5 0

3 years ago

What is the relative velocity between two cars moving in the opposite direction with velocity 20m/s

Scrat [10]

V_A=V_B=20m/s

Both are moving opposite

$\\ \sf\ast\Rrightarrow R_{AB}=V_A-V_B$

$\\ \sf\ast\Rrightarrow R_{AB}=20-20$

$\\ \sf\ast\Rrightarrow R_{AB}=0m/s$

3 0

3 years ago

An engineer examining the oxidation of SO 2 in the manufacture of sulfuric acid determines that Kc = 1.7 x 108 at 600 K:

kozerog [31]

Answer: $p_{SO_2}=0.017atm$

Explanation:

We are given:

$K_c=1.7\times 10^8$

Relation of $K_p$ with $K_c$ is given by the formula:

$K_p=K_c(RT)^{\Delta ng}$

Where,

$K_p$ = equilibrium constant in terms of partial pressure = ?

$K_c$ = equilibrium constant in terms of concentration

R = Gas constant = $0.0821\text{ L atm }mol^{-1}K^{-1}$

T = temperature = $600K$

$2SO_2(g)+O_2(g)\rightleftharpoons 2SO_3(g)$

$\Delta ng$ = change in number of moles of gas particles = $n_{products}-n_{reactants}=2-3=-1$

Putting values in above equation, we get:

$K_p=1.7\times 10^8\times (0.0821\times 600)^{-1}\\\\K_p=3.4\times 10^6$

The chemical reaction follows the equation:

$2SO_2(g)+O_2(g)\rightleftharpoons 2SO_3(g)$

The expression for $K_p$ for the given reaction follows:

$K_p=\frac{(p_{SO_3})^2}{ p_{O_2}\times {(p_{SO_2})^2}}$

We are given:

$p_{SO_3}=300atm$ $p_{O_2}=100atm$

Putting values in above equation, we get:

$3.4\times 10^6=\frac{(300)^2}{100\times {(p_{SO_2})^2}}$

$p_{SO_2}=0.017atm$

Hence, the partial pressure of the $SO_2$ at equilibrium is 0.017 atm.

3 0

3 years ago