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Mazyrski [523]
3 years ago
14

Can Someone help me answer the question?

Physics
1 answer:
soldi70 [24.7K]3 years ago
8 0

There must be a description of the ball and its environment,
somewhere earlier on the sheet where we can't see it.  We
don't know what the conditions and environment are around
the ball as it moves downward.  So I can only answer in the
most general way, and make up some scenarios.

If the ball is falling from an airplane, then it has to use some
of its energy to push air out of the way, and even then, it loses
some more energy as the air molecules scrape against its side. 
This is all called 'air resistance'.  It's a form of friction, the form that
takes energy away from anything that's moving through air.

If the ball is rolling across the lawn, then it takes some energy
to bend the blades of grass down along its path.  That's why a
ball that's rolling anywhere on Earth always stops, although
Newton's laws of motion say that an object in motion always
keeps moving and doesn't stop.

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If a person has the genotype Rr for hair where red is dominant to blue, what phenotype would this person have?
JulijaS [17]

the person's phenotype would be red hair. phenotype is what you see on the outside, genotype is what the dna says. <3

4 0
2 years ago
A ball is dropped from a height of 10 feet. each time it drops h feet, it rebounds 0.87h feet. find the total distance traveled
Llana [10]
The situation narrated above is a geometric sequence with first term equal to 10 and the common ratio equal to 0.87. Since there is no telling as to how low will the bounce be, the sequence is infinite.

The equation for the sum of the terms in an infinite geometric sequence with common ratio that is lesser than 1 is,
             S = Ao/(1 - r)
 Substituting,
             S = (10 ft) / (1 - 0.87)
              S = 76.923 

We multiply the sum by two.
              2S = 76.923 x 2 = 153.846
We subtract 10 from this because the first bounce does not travel twice.
               
<em>ANSWER: 143.846 ft</em>
8 0
3 years ago
the mass of the earth is 6×10²⁴ kg and the it's radius is 6400 km . what is the mass of a man weighing 977 N in spring balance ?
Anna71 [15]

Answer:

Mass of the man = 100 kg

Explanation:

Given that,

Mass of the Earth, M = 6×10²⁴ kg

The radius of the Earth, r = 6400 km

Force on man, F = 977 N

We need to find the mass of the man. Let the mass of the man be m. The gravitational force acting between two objects is given by :

F=G\dfrac{mM}{r^2}\\\\m=\dfrac{Fr^2}{GM}\\\\m=\dfrac{977\times (6400\times 10^3)^2}{6.67\times 10^{-11}\times 6\times 10^{24}}\\\\m=99.99\ kg

or

m = 100 kg

So, the mass of the man is 100 kg.

4 0
2 years ago
A sodium surface is illuminated with light of wavelenght 300nm. The work function of the metal is 2.4eV.
denis-greek [22]

Answer:

1) 1.67eV

2) 505nm

Explanation:

The maximum kinetic energy of photoelectrons ,

 KEmax=λhc−W=(0.3×10−6)(1.6×10−19)(6.62×10−34)(3×108)eV−2.46eV=1.67eV

If λ0 is the cut-off wavelength, W=λ0hc

or λ0=Whc=2.46×1.6×10−19(6.62×10−34)(3×108)=5.05×10−7m=505×10−9=505nm

<em>We know that the work function is the minimum photon energy for taking place of photoelectric effect. </em>

5 0
3 years ago
What 2 elements on the periodic table are solid at room temperature?
shepuryov [24]

Answer:

Eleven non-metals are gases at room temperature, including oxygen and chlorine. One non-metal, bromine, is a liquid at room temperature. The other non-metals are solids at room temperature, including carbon and sulfur.

8 0
2 years ago
Read 2 more answers
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