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Elis [28]
4 years ago
7

HELP NEEDED! Determine the mechanical energy of this object: a 1-kg ball rolls on the ground at 2 m/s.

Physics
2 answers:
Anna007 [38]4 years ago
6 0
I think it's 2 J. Hope I helped :)
valentina_108 [34]4 years ago
4 0
The mechanical energy of an object is the sum of its potential and kinetic energy.

Because the ball is on the ground, its potential energy is 0.
Its kinetic energy is given by:

K.E = 1/2 mv²
K.E = 1/2 x 1 x 2²
K.E = 2 J

Mechanical energy = 2 + 0
Mechanical energy = 2 J

The answer is B.
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Which statement about ocean surface currents is false.
Lynna [10]

B.) They have no effect on air temperature over land on the coast.

Explanation:

The statement that ocean surface currents do not have any effect on air temperature over land on the coast is very incorrect.

In fact, ocean surface currents shapes the coast a whole lot.

  • There is a constant interaction between the ocean surface current and the air masses on land.
  • They interact by simple convection through which heat is transferred from one point to the other.
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learn more;

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7 0
3 years ago
Can some one answer 4 for me and if u can't read it it says what can scientists learn by studying layers of rock in the Earth
ella [17]
They can learn more about Earth's history and environment. Studying rocks can also help scientists discover clues about what Earth was like millions of years ago. That can help them comprehend on our effects on the environment and its probable effects on humans. 
7 0
3 years ago
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Sunlight has its maximum intensity at a wavelength of 4.83 x 10'm; wha energy does this correspond to in e?
Lera25 [3.4K]

Answer:

E = 2,575 eV

Explanation:

For this exercise we will use the Planck equation and the relationship of the speed of light with the frequency and wavelength

     E = h f

     c = λ f

Where the Planck constant has a value of 6.63 10⁻³⁴ J s

Let's replace

    E = h c / λ

Let's calculate for wavelengths

    λ = 4.83 10-7 m     (blue)

    E = 6.63 10⁻³⁴ 3 10⁸ / 4.83 10⁻⁷

    E = 4.12 10-19 J

The transformation from J to eV is 1 eV = 1.6 10⁻¹⁹ J

    E = 4.12 10⁻¹⁹ J (1 eV / 1.6 10⁻¹⁹ J)

    E = 2,575 eV

5 0
4 years ago
How fast does light year travel
KIM [24]
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5 0
3 years ago
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If a basball is project upwards from the ground level with an initial velovaity of 32 feet per second, then it's height is a fun
inessss [21]

Answer:

Maximum height reached by the ball is 32 meters.

Explanation:

It is given that,

If a baseball is project upwards from the ground level with an initial velocity of 32 feet per second, then it's height is a function of time. The equation is given as :

s=-8t^2+32t...........(1)

t is the time taken

s is the height attained as a function of time.

Maximum height achieved can be calculated as :

\dfrac{ds}{dt}=0

\dfrac{d(-8t^2+32t)}{dt}=0

-16 t + 32 = 0

t = 2 seconds

Put the value of t in equation (1) as :

s=-8(2)^2+32(2)

s = 32 meters

So, the maximum height reached by the ball is 32 meters. Hence, this is the required solution.

6 0
4 years ago
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