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3 years ago

Which type of energy warms the eartha surface

Physics

2 answers:

sasho [114]3 years ago

6 0

Answer:

B. Solar energy, because solar means sun.

Hope this helps.

cestrela7 [59]3 years ago

5 0

B. Thermal energy is the energy that warms the earths surface.

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Recall that weight is a force and is equal to m*g, where g is the acceleration due to gravity exerted by the Earth near the Eart

Art [367]

Answer:

W of the person in moon ≈ 124.70 N

Explanation:

Weight: Weight of a body can be defined as the product of mass and the gravitational acceleration of the body. The S.I unit of weight is Newton (N). It can be expressed mathematically as

W = mg

Where W = weight of the body, m = mass of the body (kg) and a = acceleration of the body (m/s²)

Weight(W) = Mass (m) × Acceleration due to gravity (g)

∴ W = m × g.

If the person is on the moon,

Mass = 76.5 kg.

g (moon) = 16.6% of g ( earth)

But g(earth) = 9.80 m/s².

∴ g (moon) = 9.80 × (16.6/100)

g (moon) = 1.63 m/s², m = 76.5 Kg

∴ Weight of the person in moon = 76.5 × 1.63 =124.695 N

W of the person in moon ≈ 124.70 N

4 0

3 years ago

A rock falls from a vertical cliff that is 4.0 m tall and experiences no significant air resistance as it falls. At what speed w

Zinaida [17]

Answer:

v = 6.3 m/s

Explanation:

Since no significant air resistance exists, total mechanical energy must be kept constant at any time.
At the top of the cliff, all the energy is gravitational potential energy, as follows:

$E_{i} = K_{i} + U_{i} = 0 + U_{i} (1)$

If we choose the ground level as our zero reference level for the gravitational potential energy, Ui is simply:
Ui = m*g*h (1)
At any height, the sum of the kinetic and the gravitational potential energy must be equal to (1).
We know from the question, that at the point of interest, both types of energies must be equal each other, so we can write the following expression from (1):

$m*g* h = 2*\frac{1}{2}*m*v^{2} (2)$

Dividing both sides by m, simplifying, and solving for v, we get:

$v = \sqrt{g*h} =\sqrt{9.8m/s2*4.0m} = 6.26 m/s (3)$

v = 6.3 m/s (with two significative figures)

8 0

3 years ago

. Orbit of a satellite It is advantageous to place communications satellites in a circular orbit so that their position is fixed

Alexxx [7]

Answer:

a) r = 4.22 10⁷ m, b) v = 3.07 10³ m / s and c) a = 0.224 m / s²

Explanation:

a) For this exercise we will use Newton's second law where acceleration is centripetal and force is gravitational force

F = m a

a = v² / r

F = G m M / r²

G m M / r² = m v² / r

G M / r = v²

The squared velocity is a scalar and this value is constant, so let's use the uniform motion relationships

v = d / t

As the orbit is circular the distance is the length of the circle in 24 h time

d = 2π r

t = 24 h (3600 s / 1 h) = 86400 s

Let's replace

G M / r = (2π r / t)²

G M = 4 π² r³ / t²

r = ∛(G M t² / (4π²)

r = ∛( 6.67 10⁻¹¹ 5.98 10²⁴ 86400² / (4π²)) = ∛( 75.4 10²¹)

r = 4.22 10⁷ m

b) the speed module is

v = √G M / r

v = √(6.67 10⁻¹¹ 5.98 10²⁴/ 4.22 10⁷

v = 3.07 10³ m / s

c) the acceleration is

a = G M / r²

a = 6.67 10⁻¹¹ 5.98 10²⁴ / (4.22 10⁷)²

a = 0.224 m / s²

5 0

3 years ago

Which one of the following statements regarding strength training workouts is most accurate

AnnZ [28]

Answer:

Explanation:

3 0

4 years ago

Two children weighing 40 lbs and 50 lbs each are balancing their teacher weighing 120 lbs on a seesaw. The teacher is sitting 5

ExtremeBDS [4]

Answer:

5 feet

Explanation:

First lets imagine that the values are in meters and kg, to make it easier for me.

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The force created by the teacher is 120 × 5 = 600N.

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The force created by the 50 kg student is 50 × 8 = 400N

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The force that needs to be created by the 40 kg student is 600N - 400N = 200N.

To create that force that student needs to sit 200 ÷ 40 = 5m.

So the 40 lbs student is sitting 5 feet from the fulcrum.

6 0

3 years ago