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2 years ago

Please tell me if if these statements are true or false

Physics

2 answers:

alex41 [277]2 years ago

6 0

Answer:

Im not sure if im right but this is what i got( i have no clue how to explain im sorry)

1. False

2. False

3. True

4. False

adelina 88 [10]2 years ago

6 0

1. False- light usually doesn’t cause changes to certain materials.

2. True (I think) I don’t really know how to explain this one

3. False- Not all light can be seen especially when light can travel

4. False- Certain hard materials light won’t be able to go through because of its density.

Sorry about the 2nd one and I’m not 100% on this but hope this helps.

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Which sentence in the passage can be used to conclude that Eris is a dwarf planet and not a planet?

Lelu [443]

Eris is slightly more massive than Pluto. However, both of them are smaller than Earth's Moon.
This should conclude that Eris is a dwarf planet.

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2 years ago

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Froghopper insects have a typical mass of around 11.3 mg and can jump to a height of 58.8 cm. The takeoff velocity is achieved a

allochka39001 [22]

Answer:

2874.33 m/s²

Explanation:

t = Time taken

u = Initial velocity

v = Final velocity

s = Displacement

a = Acceleration

g = Acceleration due to gravity = 9.81 m/s²

$v^2-u^2=2as\\\Rightarrow a=\frac{v^2-u^2}{2s}\\\Rightarrow a=\frac{v^2-0^2}{2\times h}\\\Rightarrow v^2=2ah\ m/s$

Now H-h = 0.588 - 0.002 = 0.586 m

The final velocity will be the initial velocity

$v^2-u^2=2as\\\Rightarrow 0^2-u^2=2gs\\\Rightarrow -2ah=2\times g(H-h)\\\Rightarrow -2a0.002=2\times g0.586\\\Rightarrow a=-\frac{0.586\times -9.81}{0.002}\\\Rightarrow a=2874.33\ m/s^2$

Acceleration of the frog is 2874.33 m/s²

6 0

3 years ago

An unstretched spring has a length of 0.30 m. When the spring is stretched to a total length of 0.60 m, it supports traveling wa

IceJOKER [234]

Explanation:

Below is an attachment containing the solution

7 0

2 years ago

Water flows through a horizontal pipe (from a wider area to narrow area section) and then out into the atmosphere at a speed v1

Darina [25.2K]

Answer:

V = 6.36 m³

Explanation:

For this exercise we will use fluid mechanics relations, starting with the continuity equation.

Let's write the flow equation

Q = v₁ A₁

The area of a circle is

A = π r²

Radius is half the diameter

A = π/4 d²

Q = v₁ π/4 d₁²

Q = π/ 4 15 0.03 2

Q = 0.0106 m3 / s

The volume of water in t = 10 min = 10 60 = 600 s

Q = V / t

V = Q t

V = 0.0106 600

V = 6.36 m³

4 0

2 years ago

An object accelerating only under the force of gravity is A) free fall or B) acceleration due to gravity

Andrews [41]

-- An object acted on by only the force of gravity, on or near Earth's surface,
accelerates downward at the rate of about 9.8 m/s² without air resistance.

-- That number is "the acceleration due to gravity, on Earth".

-- The object in that situation is said to be in "free fall".

3 0

2 years ago