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3 years ago

This is how manganese appears in the periodic table. The arrow is pointing to the atomic of manganese.

2 answers:

5 0

The way an element is shown in the periodic table is called the element's symbol. In the case of manganese, it is Mn. Other information shown alongside the element's symbol is the atomic mass, which for manganese is 55, and the atomic number of the element, which for manganese is 25.

nalin [4]3 years ago

4 0

The answer is symbol :)

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Why is the sun renewable but oil is non renewable?

DochEvi [55]

Because once you use oil you can not reuse it but the sun you can because it is always here and it has solar energy

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3 years ago

Define output work and input work

Olenka [21]

Answer: Input work is the work done on a machine as the input force acts through the input distance.Other ways it would be the work done on a body or system, that is, forces that are applied to the body or system. This is in contrast to output work which is a force that is applied by the body or system to something else.Output work is the work done by a machine as the output force acts through the output distance. The machine does to the object to increase the output distance.

Explanation:

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4 years ago

Two cars collide at an icy intersection and stick together afterward. The first car has a mass of 1200 kg and was approaching at

GuDViN [60]

Answer:

a) v = 11.24 m / s , θ = 17.76º b) Kf / K₀ = 0.4380

Explanation:

a) This is an exercise in collisions, therefore the conservation of the moment must be used

Let's define the system as formed by the two cars, therefore the forces during the crash are internal and the moment is conserved

Recall that moment is a vector quantity so it must be kept on each axis

X axis

initial moment. Before the crash

p₀ₓ = m₁ v₁

where v₁ = -25.00 me / s

the negative sign is because it is moving west and m₁ = 900 kg

final moment. After the crash

$p_{x f}$ = (m₁ + m₂) vx

p₀ₓ = p_{x f}

m₁ v₁ = (m₁ + m₂) vₓ

vₓ = m1 / (m₁ + m₂) v₁

let's calculate

vₓ = - 900 / (900 + 1200) 25

vₓ = - 10.7 m / s

Axis y

initial moment

$p_{oy}$ = m₂ v₂

where v₂ = - 6.00 m / s

the sign indicates that it is moving to the South

final moment

p_{fy}= (m₁ + m₂) $v_{y}$

p_{oy} = p_{fy}

m₂ v₂ = (m₁ + m₂) v_{y}

v_{y} = m₂ / (m₁ + m₂) v₂

we calculate

$v_{y}$ = 1200 / (900+ 1200) 6

$v_{y}$ = - 3,428 m / s

for the velocity module we use the Pythagorean theorem

v = √ (vₓ² + v_{y}²)

v = RA (10.7²2 + 3,428²2)

v = 11.24 m / s

now let's use trigonometry to encode the angle measured in the west clockwise (negative of the x axis)

tan θ = $v_{y}$ / Vₓ

θ = tan-1 v_{y} / vₓ)

θ = tan -1 (3,428 / 10.7)

θ = 17.76º

This angle is from the west to the south, that is, in the third quadrant.

b) To search for loss of the kinetic flow, calculate the kinetic enegy and then look for its relationship

Kf = 1/2 (m1 + m2) v2

K₀ = ½ m₁ v₁² + ½ m₂ v₂²

Kf = ½ (900 + 1200) 11.24 2

Kf = 1.3265 105 J

K₀ = ½ 900 25² + ½ 1200 6²

K₀ = 2,8125 10⁵ + 2,16 10₅4

K₀ = 3.0285 105J

the wasted energy is

Kf / K₀ = 1.3265 105 / 3.0285 105

Kf / K₀ = 0.4380

this is the fraction of kinetic energy that is conserved, transforming heat and transforming potential energy

5 0

3 years ago

For a human zygote to become an embryo it must undergo

slava [35]

Only mitotic divisions change the zygote to embryo. The other sentences are related to the way zygote is created

8 0

3 years ago

Read 2 more answers

During the time a compact disc (CD) accelerates from rest to a constant rotational speed of 477 rev/min, it rotates through an a

atroni [7]

Answer:

126.01 rad/s^2

Explanation:

since it starts from rest, initial angular speed ω' = 0 rad/s

angular speed N = 477 rev/min

angular speed in rad/s ω = $\frac{2\pi N}{60}$ = $\frac{2*3.142* 477}{60}$ = 49.95 rad/s

angular displacement ∅ = 1.5758 rev

angular displacement in rad/s = $2\pi N$ = 2 x 3.142 x 1.5758 = 9.9 rad

angular acceleration $\alpha$ = ?

using the equation of angular motion

ω^2 = ω'^2 + 2 $\alpha$ ∅

imputing values, we have

$49.95^{2} = 0^{2} + (2 *\alpha*9.9 )$

2495 = 19.8 $\alpha$

$\alpha$ = 2495/19.8 = 126.01 rad/s^2

8 0

3 years ago