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3 years ago

Earth is the only planet that has a _ and a _.

Physics

2 answers:

zaharov [31]3 years ago

5 0

Livable atmosphere
livable climate
Those are both true, however I'm not sure they're the answers you're looking for.

steposvetlana [31]3 years ago

5 0

Answer: The correct answer is biosphere and hydrosphere.

Explanation:

Cryosphere is defined as the region on Earth where water is present in the solid form like lake ice, snow covers, glaciers etc..

Lithosphere is defined as the solid, outermost part of the Earth's surface like soil.

Biosphere is defined as the part of the Earth's surface and atmosphere in which living things exist.

Hydrosphere is defined as the region of the planet which is made up of water.

Earth is the only planet where life exists and for the existence the planet biosphere and hydrosphere.

Hence, the correct answer is biosphere and hydrosphere.

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Which term defines the distance from the focal point to either a lens or a mirror?

Nookie1986 [14]

The focal length, like you said it's the distance between the FOCAL point and the mirror.

6 0

4 years ago

A box of mass 26 kg is initially at rest on a flat floor. The coefficient of kinetic friction between the box and the floor is 0

Kazeer [188]

Answer:

$\Delta K = 52J$

Explanation:

The change in kinetic energy will be simply the difference between the final and initial kinetic energies: $\Delta K=K_f-K_i$

We know that the formula for the kinetic energy for an object is:

$K=\frac{mv^2}{2}$

where m is the mass of the object and v its velocity.

For our case then we have:

$\Delta K = K_f-K_i=\frac{mv_f^2}{2}-\frac{mv_i^2}{2}=\frac{m(v_f^2-v_i^2)}{2}$

Which for our values is:

$\Delta K = \frac{m(v_f^2-v_i^2)}{2} = \frac{(26Kg)((2m/s)^2-(0m/s)^2)}{2} = 52J$

3 0

4 years ago

A responder can protect himself/herself from radiation by using shielding as a response action. What materials are best for prot

Irina-Kira [14]

Answer:

Few millimeter thick aluminium, water, wood, acrylic glass or plastic.

Explanation:

The materials that are best for protection against beta particles are few millimeter thickness of aluminium, but for the high energy beta-particles radiations the low atomic mass materials such as plastic, wood, water and acrylic glass can be used.

These materials can also be used in personal protective equipment which includes all the clothing that can be worn to prevent any injury or illness due to the exposure to radiation.

3 0

3 years ago

A large, 68.0-kg cubical block of wood with uniform density is floating in a freshwater lake with 20.0% of its volume above the

LenaWriter [7]

Answer:

a) V = 0.085 m^3

b) m = 17 kg

Explanation:

1) Data given

mb = 68 kg (mass for the block)

20% of the block volume is floating

100-20= 80% of the block volume is submerged

2) Notation

mb= mass of the block

Vw= volume submerged

mw = mass water displaced

V= total volume for the block

3) Forces involved (part a)

For this case we have two forces the buoyant force (B), defined as the weight of water displaced acting upward and the weight acting downward (W)

Since we have an equilibrium system we can set the forces equal. By definition the buoyant force is given by :

B = (mass water displaced) g = (mw) g (1)

The definition of density is :

$\rho_w = \frac{m_w}{V_w}$