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3 years ago

Give three examples of properties of elements

Physics

2 answers:

IgorC [24]3 years ago

6 0

Answer: Atomic number, Atomic Mass, Ionic radius

Explanation:

marishachu [46]3 years ago

4 0

Atomic number, atomic mass, and ionic radius

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The angle of reflection is the angle between the normal line and the _____.A.imageB.mirrorC.reflected rayD.incident ray

Montano1993 [528]

ANSWER:

C. reflected ray

STEP-BY-STEP EXPLANATION:

The line that divides the angle between the incident ray and the reflected ray into two equal angles is known as the normal line.

Therefore, the angle between the reflected ray and the normal is known as the angle of reflection.

Therefore, the correct answer is C. reflected ray

4 0

1 year ago

A 3 kg block is released from rest to slide down a ramp with friction. The length that the block slides is 2 meters and the angl

Arte-miy333 [17]

Answer:

(a). The acceleration is 3.20 m/s².

(b). The amount of work done by each force is 19.2 J.

(c). The total work done on the block is 19.2 J.

(d). The final speed of the block is 6.26 m/s.

Explanation:

Given that,

Mass of block = 3 kg

Distance = 2 m

Angle = 30°

Coefficient of kinetic friction = 0.20

(a). We need to calculate the acceleration

Using balance equation of force

$N = mg\co\theta$

$mg\sin\theta-f_{k}=ma$

$a = g\sin\theta-\mu g\cos30$

Put the value into the formula

$a=g(\sin30-0.20\cos30)$

$a=9.8(\dfrac{1}{2}-0.20\times\dfrac{\sqrt{3}}{2})$

$a=3.20\ m/s^2$

The acceleration is 3.20 m/s².

(b). We need to calculate the amount of work done by each force

Using formula of work done

Normal force is

$N = mg\cos30$

So due to this the net force is zero then the no work done by reaction force.

By another force,

$W= F\times d$

$W=ma\times d$

Put the value into the formula

$W= 3\times3.20\times2$

$W=19.2\ J$

The amount of work done by each force is 19.2 J.

(c). We need to calculate the total work done on the block

The total work done on the block is 19.2 J.

(d). We need to calculate the final speed of the block

Using equation of motion

$v^2=u^2+2gs$

Put the value into the formula

$v^2=0+2\times9.8\times2$

$v=\sqrt{2\times9.8\times2}$

$v=6.26\ m/s$

The final speed of the block is 6.26 m/s.

Hence, This is the required solution.

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3 years ago

How much time would it take for an

Elina [12.6K]

36 and a half hours

Explanation:

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4 years ago

A 30 N block is being pulled along a horizontal surface with an acceleration of 6 m/s2 by a rope. The coefficient of kinetic fri

nata0808 [166]

Answer:

33N

Explanation:

Download pdf

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4 years ago

30 points answer ASAP please

djverab [1.8K]

Explanation:

Momentum of the system is a constant when there aren't external forces..

So,When first Balls velocity is went down to zero... its momentum is also zero and beacause momentum should be a constant...now second ball must have a momentum of 20 kg * m/s

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3 years ago