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2 years ago

Explain how asteroids and meteorites were a heat source for early Earth. Where is all that heat now that

Physics

1 answer:

AnnZ [28]2 years ago

5 0

Answer:

deep in the earth's crust

Explanation:

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A force of 25N acts on a mass of 5.0kg, initially at rest. Calculate the distance travelled before achieving a velocity of 20m/s

spin [16.1K]

Answer:

40m

Explanation:

let's calculate the acceleration first

force = mass × acceleration

rearranging to find acceleration:

acceleration = force ÷ mass

force = 25N, mass = 5.0kg

acceleration = 25 ÷ 5 = 5ms^-2

we can now use the formula v^2 = u^2 + 2as where v = final velocity, u = initial velocity, a = acceleration and s = distance

rearranging v^2 = u^2 + 2as the distance is

s = (v^2 - u^2) ÷ 2a

v = 20, u = 0, a = 5

s = (20^2 - 0^2) ÷ (2 × 5) = 40m

the distance is 40m

6 0

2 years ago

(this is a question from my leap practice)

ki77a [65]

The answer is C. in sort of a way. You can't technically see black matter. However, it is holding the galaxies together.

4 0

3 years ago

What is the maximum angular momentum Lmax that an electron with principal quantum number n = 2 can have? Express your answer in

butalik [34]

Answer:

$L_{max} = 1.414$ ℏ

Given:

Principle quantum number, n = 2

Solution:

To calculate the maximum angular momentum, $L_{max}$ , we have:

$L_{max} = \sqrt {l(1 + l)}$ (1)

where,

l = azimuthal quantum number or angular momentum quantum number

Also,

n = 1 + l

2 = 1 + l

l = 1

Now,

Using the value of l = 1 in eqn (1), we get:

$L_{max} = \sqrt {1(1 + 1)} = \sqrt 2$

$L_{max} = 1.414$ ℏ

4 0

3 years ago

A race car starts from rest on a circular track of radius 378 m. The car's speed increases at the constant rate of 0.580 m/s2. A

insens350 [35]

Answer:

a) $V=14.904m/s$

b) $d = 191.49 m$

c) $t= 25.696 s$

Explanation:

From the question we are told that:

Radius $r =378m$

Acceleration $a=0.580$

Generally the equation for speed of the car is mathematically given by

$a=\frac{v^2}{r}$

$V=\sqrt{a*r}$

$V=\sqrt{0.58*383}$

$V=14.904m/s$

Generally the equation for distance traveled of the car is mathematically given by

$V^2=u^2+2ad$

$d=\frac{V^2}{2a}$

$d=\frac{14.904^2}{2*0.58}$

$d = 191.49 m$

Generally the equation for time of the car is mathematically given by

$V=u+at$

$t=\frac{V}{a}$

$t=\frac{14.904}{0.58}$

$t= 25.696 s$

3 0

3 years ago

You rub a balloon on your head and it becomes negatively charged. The balloon will be MOST attracted to A) a piece of metal. B)

NikAS [45]

I believe the correct answer is B.<span>positively charged hair.</span>

8 0

3 years ago

Read 2 more answers