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4 years ago

What happened to change people’s views and lead them to believe in continental drift?

1 answer:

4 0

Aside from Earth-quakes and volcanoes, a scientist noticed how all of the continents fit almost PERFECTLY together. And he used that as evidence to prove the theory of continental drift.

I hope this helps! :)

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You are standing on a bathroom scale in an elevator in a tall building. Your mass is 64 kg. The elevator starts from rest and tr

Genrish500 [490]

Answer:

= 922N

Explanation:

m = 64kg

v(t) = (3.0 m/s²)t + (0.20 m/s³)t².

t = 4.0s

differentiation of v(t) so the acceleration is given by

$a(t) = \frac{ dv(t)}{dt} \\ = 3.0 + 0.4t\\ t = 4s\\a(4) = 3.0 + 0.4(4)\\= 4.6ms^-^2$

using Newton’s second law

F (net) = ΣFg = ma

⇒R - w = ma

R = m(a + g)

= 64 (9.81 + 4.6)

= 922N

5 0

3 years ago

A 3.00 cm diameter coin rolls up a 30.0 degree incline plane. The coin starts with an initial angular speed of 60.0 rad/s in a s

yanalaym [24]

Answer:

The coin roll up to 11.57 cm at 30° incline plane.

Explanation:

Given that,

Diameter = 3.00 cm

Angle = 30.0 °

Angular speed = 60.0 rad/s

We need to calculate the length

Using conservation of energy

$\dfrac{1}{2}mv^2+\dfrac{1}{2}I\omega^2=mgh$

$\dfrac{1}{2}mr^2\omega^2+\dfrac{1}{2}\times(0.4mr^2)\times\omega^2=mgl\sin\theta$

Put the value into the formula

$\dfrac{1}{2}\times(1.5\times10^{-2})^2\times(60.0)^2+\dfrac{1}{2}\times0.4\times(1.5\times10^{-2})^2\times(60.0)^2=9.8\times l\sin30$

$l\sin30=\dfrac{0.567}{9.8}$

$l=2\times\dfrac{0.567}{9.8}$

$l=0.1157\ m$

Hence, The coin roll up to 11.57 cm at 30° incline plane.

8 0

4 years ago

Compare and contrast the different parts of the Electromagnetic Spectrum. Evaluate the usefulness of each part and decide which

stepan [7]

Give me food rn because I haven’t ate and someone offered me sum and I said no

6 0

2 years ago

An electron undergoes a transition from an initial (ni) to a final (nf ) energy state. The energies of the ni and nf energy stat

Ipatiy [6.2K]

The equation for the energy (E) of the electron may be obtained by the equation,
E = hc / λ
where h is Planck's constant, c and λ are speed of light and wavelength, respectively. Substituting the values,
(-2.179x10^-18 - -8.720x10^-20) = (6.626x10^-34)(2.998x10^8)/ λ
From the equation, the value of λ is approximately equal to 9.496x10^-8 m.

6 0

3 years ago

Describe how the mass, luminosity, surface temperature, and radius of main-sequence stars change in value going from the “bottom

Sladkaya [172]

Answer:

1. Least massive stars are the coolest and least luminous, lower right of main sequence, on HR diagram.

2. Most massive are the hottest and most luminous, upper left of main sequence on Hr Diagram.

3. The radius of stars are related to their sprectral type. having the O being the hottest upper left and M being the coolest bottom right.

4 0

4 years ago