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3 years ago

1. Describe how the periodic table differentiates between metals and nonmetals.

1 answer:

7 0

There would be a symbol on names of the elements that would say which state it would usually be in.

there are more metals in the periodic table of elements (currently) if that's what the second question is asking about

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A spring with k = 53 N/m hangs vertically next to a ruler. The end of the spring is next to the 18 cm mark on the ruler. If a 2.

Anarel [89]

Answer:

1.07 m

Explanation:

x = Compression of the spring

k = Spring constant = 53 N/m

Initial length = 18 cm

P = Kinetic energy

K = Kinetic energy

At the lowest point of the mass the energy conservation is as follows

$P_{ig}+P_{is}+K_i=P_{fg}+P_{fs}+K_f\\\Rightarrow mgx+0+0=mgx+\frac{1}{2}kx^2\\\Rightarrow x=\frac{2mg}{k}\\\Rightarrow x=\frac{2\times 2.4\times 9.81}{53}\\\Rightarrow x=0.89\ m$

At its lowest position the mark on the ruler will be

$x_f=0.18+0.89\\\Rightarrow x_f=1.07\ m$

The spring line will end up at 1.07 m

4 0

3 years ago

Calculate the kinetic energy of a 5.2 kg object moving at 2.4 m/s.

Lilit [14]

Answer:

Kinetic energy, K = 14.97 J

Explanation:

We have,

Mass of the object, m = 5.2 kg

Velocity of the object, v = 2.4 m/s

It is required to find the kinetic energy of the object. As it is moving with some velocity, it will have kinetic energy. It is given by :

$K=\dfrac{1}{2}mv^2\\\\K=\dfrac{1}{2}\times 5.2\times (2.4)^2\\\\K=14.97\ J$

So, the kinetic energy of the object is 14.97 J.

7 0

3 years ago

A polarized Light of intensity I0 is incident on an analyzer. What should the angle between the axis of polarization of the ligh

Svetradugi [14.3K]

Answer:

The the angle between the axis of polarization of the light and the transmission axis of the analyzer is 52⁰.

Explanation:

Given;

I₀ as incident light intensity

The intensity of a linearly polarized light passing through a polarizer is given by Malus' law:

I = I₀Cos²θ

where;

I is the intensity after passing through the analyzer

θ is the the angle between the axis of polarization of the light and the transmission axis of the analyzer.

If 38% of the total intensity is transmitted, then I = 38% of I₀ = 0.38I₀

0.38I₀ = I₀Cos²θ

0.38 = Cos²θ

Cosθ = √0.38

Cosθ = 0.6164

θ = Cos⁻¹ (0.6164)

θ = 51.95° = 52⁰

Therefore, the angle between the axis of polarization of the light and the transmission axis of the analyzer to allow 38% of the total intensity to be transmitted is 52⁰.

3 0

3 years ago

What is the wavelength of a 1200 Hz sound wave?

blagie [28]

Answer:

50cm

Explanation:

im honestly guessing

3 0

3 years ago

5. Density equals mass divided by volume. If a

lidiya [134]

Answer:

3 significant figures

Explanation:

23.523 has 5 significant figures that is the figures 2,3,5,2,3

17.5 has 3 significant figures that is the figures 1,7,5

Density is mass/volume (given in question)

Density is 23.523g/17.5L= 1.34417142857143 g/L (Without rounding off the answer)

This has 15 significant figures

However, for precision, the result is 1.34 g/L which has 3 significant figures.

4 0

3 years ago