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3 years ago

5

A skier pushes off the top of a hill with an initial speed of 3.30 m/s. How fast will she be moving after dropping 5.00 meters i

n elevation if friction is negligible?

1 answer:

Gala2k [10]3 years ago

8 0

Answer:

eeeeeeeeeeeeeeeeeeeee

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For total internal reflection to occur, all of the following must happen but __________. light must travel slower in the first m

bija089 [108]

Answer:

Explanation:

When a ray of light passes through denser medium to rarer medium and then after refraction it comes back into the denser medium, the phenomenon is called total internal refraction.

There are two necessary conditions for the total internal refraction.

(1) The refraction takes place g=from denser medium to rarer medium.

(2) The angle of incidence in the denser medium should be more than the critical angle for that pair of media.

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4 years ago

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Which is a diatomic molecule? <br> A. Ar <br> B. CO <br> C. CO2 <br> D. NaCl

snow_tiger [21]

Answer: B. CO

Explanation:

Diatomic molecules are those that are formed by two atoms of the same chemical element (homonuclear diatomic molecule) or different chemical element (heteronuclear diatomic molecule).

In this sense, oxygen is a homonuclear diatomic molecule because it is formed by two atoms of the same element ( $O_{2}$ ) and Carbon monoxide ( $CO$ ) is heteronuclear diatomic molecule.

Sodium Chloride $NaCl$ is not a diatomic molecule because is a product of ionization, but it can be diatomic in its gas phase with a polar covalent bond.

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3 years ago

Two waves collide and the temporary combined waves that results is smaller that the original wave.

zimovet [89]

A.

Destructive interference is when two waves cancel each other out or when the crest of one wave passes through the trough of another wave.

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3 years ago

A torque of 4 Nm is required to rotate the intermediate cylinder at 30 radians/min. Calculate the viscosity of the oil. All cyli

NISA [10]

Answer: viscosity of the oil becomes μ = 0.2003 pa.s

Explanation:

from the given question, we have that

torque T = 4Nm

height H = 450mm = 0.45m

rotational speed ω = 30rpm = 30×2π/60 = 3.14 rad/sec

also to calculate for the linear velocity of the intermediate cylinder,

V = Rω

where R is the radius of the cylinder.

now we substitute values of R and ω, we have

V = Rω

V = 0.15 × 3.14 = 0.471 m/s

calculating the drag force on the two side of the cylinder;

Fd = 2μA (Δv/Δy)

Fd = 2μA V/h

where A = 2πRH

Fd = 2μ(2πRH) V/h

h = thickness, μ = viscosity of oil, H = height of cylinder, and V = mean velocity of cylinder

substituting values we have,

Fd = 2μ * (2π*0.15*0.45)* 0.471/0.003

Fd = 133.10μN

from the torque equation, we can calculate the viscosity

thus, T = Fd*R

we already have Fd = 133.10μN, substituting it into the above expression we have

T = 133.10μ * 0.15 where T is 4Nm,

∴ μ = 4/ 133.1*0.15

μ = 0.2003 pa.s

i hope this helps, cheers

6 0

3 years ago

Talja [164]

Answer:

Hurricane

Explanation:

Hurricane can be described as a huge storm that came with a strong and harsh wind. This wind tends to move in a circular motion over warm ocean water that are found in tropical regions.

Hurricane comes with strong winds that move at the rate of over 60 miles per hour, this results in the formation of a heavy rainfall. Hurricanes are also referred to as cyclones depending on where they take place. In places like Florida, which is surrounded by the Atlantic ocean the type of natural hazard that occurs there is known is hurricane.

Hurricane is formed when warm air that emanates from the ocean begins to rise up to a very high temperature, When it comes across a much more cooler air the steam condenses and results in a heavy downpour.

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3 years ago

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