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3 years ago

5

Help please? I dont understand what this means.

1 answer:

Alex Ar [27]3 years ago

5 0

The answer is c for real

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A car travels a distance of 74 meters in 7 seconds. What is the average speed of the car?

Nuetrik [128]

Answer:

<h2>10.57 m/s</h2>

Explanation:

The average speed of the car can be found by using the formula

$s = \frac{d}{t } \\$

d is the distance

t is the time taken

From the question we have

$s = \frac{74}{7} \\ = 10.571428...$

We have the final answer as

<h3>10.57 m/s</h3>

Hope this helps you

4 0

3 years ago

An experiment begins with crystalline salt at the bottom of an otherwise empty glass. First, students add water to the glass. Th

vfiekz [6]

Answer:

Explanation:

When we add salt to water entropy of the system increases because some amount of energy is released as salt dissolves in the water due to the dissociation of ions.

Therefore entropy of the system after the salt dissolves is highest among them all and the least entropy is associated when mixing begins.

Entropy is the degree of randomness and it increases when salt dissociates to $Na^{+}\ and\ Cl^{-}$ as these ions are freer to move inside an aqueous solution compared to Previous state.

8 0

3 years ago

In a Young's double-slit experiment the separation distance y between the second-order bright fringe and the central bright frin

atroni [7]

Answer:

Y = 0.0254 m = 25.4 mm

Explanation:

The formula for the fringe spacing in Young's Double-slit experiment is given by the following formula:

$Y = \frac{\lambda L}{d}$

where,

Y = fringe spacing = 0.0176 m

λ = wavelength = 425 nm = 4.25 x 10⁻⁷ m

L = Distance between screen and slits

d = slit separation

Therefore,

$\frac{0.0176\ m}{4.25\ x\ 10^{-7}\ m} = \frac{L}{d}\\\\\frac{L}{d} = 41411.76$

Now, for:

λ = 614 nm = 6.14 x 10⁻⁷ m

$Y = (6.14\ x\ 10^{-7}\ m)(41411.76)\\$

<u>Y = 0.0254 m = 25.4 mm</u>

8 0

3 years ago

A 240 V circuit has 20 A flowing through it. How much power is it using?

Delvig [45]

Explanation:

P = IV

V = 240

I = 20

P = ?

P = 240 × 20

P = 4800 watts

6 0

3 years ago

An electrical motor spins at a constant 1975.0 rpm. If the armature radius is 7.112 cm, what is the acceleration of the edge of

stealth61 [152]

Answer:

Option D is the correct answer.

Explanation:

Since value of angular acceleration is constant, the body has only centripetal acceleration.

Centripetal acceleration

$a=\frac{v^2}{r}=\frac{(r\omega )^2}{r}=r\omega ^2$

We have radius = 7.112 cm = 0.07112 m

Frequency, f = 1975 rpm = 32.92 rps

Angular frequency, ω = 2πf = 2 x π x 32.92 = 206.82 rad/s

Substituting in centripetal acceleration equation,

$a=r\omega ^2=0.07112\times 206.82^2=3042.17m/s^2$

Option D is the correct answer.

3 0

3 years ago