3 years ago

Why is ice harder than liquid water?

1 answer:

6 0

Hello~

Ice is harder than liquid water because the molecules of ice are linked more tightly together than the molecules of liquid water.

Hope this helps!

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What is the weight of a 4.5 kg mass on Earth?

swat32

Answer:

7.535×10^25 earth mass

Explanation:

for an approximate result,divide the mass value by 9.223e+18

4 0

3 years ago

If a spectral line from a distant star is measured to have a wavelength of 497.15 nm, but is normally at 497.22 nm how fast (spe

KiRa [710]

Answer:

The speed is 42210 m/s.

Explanation:

Given that,

Normally wavelength $\lambda= 497.22\ nm$

Observed spectral line $\Delta \lambda+\lambda= 497.15\ nm$

We need to calculate the change in wavelength

Using formula of wavelength

$\Delta \lambda+\lambda=497.15$

$\Delta\lambda+497.22=497.15$

$\Delta\lambda=497.15-497.22$

$\Delta\lambda=−0.07\ nm$

We need to calculate the value of z

Using formula for z

$z=\dfrac{\Delta\lambda}{\lambda}$

Put the value into the formula

$z=\dfrac{-0.07}{497.22}$

$z=−0.0001407$

We need to calculate the speed

Using formula of speed

$v=c\times z$

Put the value into the formula

$v=3\times10^{8}\times0.0001407$

$v=42210\ m/s$

Hence, The speed is 42210 m/s.

5 0

3 years ago

Read 2 more answers

Earth’s plates move only a few _____ per year. a. centimeters b. meters

Alik [6]

Answer:

centimeters

Explanation:

earth's plates move only a few centimeters per year.

8 0

3 years ago

Whats the answer to this question show in the picture

devlian [24]

Answer:

The answer is 10 m/s

The difference between mass and weight is that mass is the amount of matter in a material while weight is a measure of how the force of gravity acts upon that mass.

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4 years ago

Asexual reproduction involves only one parent. The offspring of this type of reproduction have - F DNA identical to the DNA of t

Sedbober [7]

Answer:

DNA identical to the DNA of the parent

Explanation:

5 0

3 years ago