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4 years ago

How far is the sun from the moon?

Physics

2 answers:

Pani-rosa [81]4 years ago

7 0

<span>The distance is estimated to be about 150 million kilometers</span>

enot [183]4 years ago

5 0

An average of about 150 million kilometres from the sun.

yeah

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By evaluating their dot product, find the values of the scalar s for which the two vectors ~b = ˆx + syˆ and ~c = ˆx−syˆ are ort

AlladinOne [14]

Answer:

$s=\pm 1$

Explanation:

The dot product of two vectors $\vec{a}=a_1\vec{x}+b_1\vec{y}$ and $\vec{b}=a_2\vec{x}+b_2\vec{y}$ is given by

$\vec{a}\cdot\vec{b}=a_1\cdot a_2+b_1\cdot b_2$

The dot product of two orthogonal vector is always zero thus if $\vec{a}=\vec{x}+s\vec{y}$ and $\vec{b}=\vec{x}-s\vec{y}$ , their dot product would be

$\vec{a}\cdot\vec{b}=1\times1+s\times-(s)=1-s^2=0$

$\implies 1-s^2=0$

$\implies s^2=1$

$\implies s=\pm 1$

4 0

3 years ago

The world’s supply of fossil fuels will _____.

Mekhanik [1.2K]

The world’s supply of fossil fuels will dwindle slowly until a replacement source is found that provides the same power.

bc some day we will actually run out of it and find sth that gives power

3 0

3 years ago

Read 2 more answers

How much energy is required to vaporize 100g of water at its boiling point?

Karolina [17]

Latent heat fusion(l)=540

∆t= temp(100-0)

Q=ml+ms∆T

Q=500.100+100.1.100
Q=64000 cal

5 0

3 years ago

A rubber ball and a lump of clay have equal mass. They are thrown with equal speed against a wall. The ball bounces back with ne

gregori [183]

Answer:

The ball experiences the greater momentum change

Explanation:

The momentum change of each object is given by:

$\Delta p = m \Delta v= m (v-u)$

where

m is the mass of the object

v is the final velocity

u is the initial velocity

Both objects have same mass m and same initial velocity u. So we have:

- For the ball, the final velocity is

$v=-u$

Since it bounces back (so, opposite direction --> negative sign) with same speed (so, the magnitude of the final velocity is still u). So the change in momentum is

$\Delta p=m(v-u)=m((-u)-u)=-2mu$

- For the clay, the final velocity is

$v=0$

since it sticks to the wall. So, the change in momentum is

$\Delta p = m(v-u)=m(0-u)=-mu$

So we see that the greater momentum change (in magnitude) is experienced by the ball.

3 0

3 years ago

What is the source of energy in the food chain

Aleksandr [31]

Answer:

The first source of energy in a food chain is producer.

Explanation: In the food chain, the producer will be a plant that a primary consumer, a herbivore eats. The herbivore gets eaten by a secondary consumer, carnivorous. When the carnivore dies, it becomes energy for a decomposer.

5 0

3 years ago