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krek1111 [17]
4 years ago
6

A 7.00 kg bowling ball is held 2.00 m above the ground. Using g = 9.80 m/s2, how much energy does the bowling ball have due to i

ts position?
Physics
2 answers:
Naily [24]4 years ago
5 0

Answer: 137.2 J

Explanation:

The gravitational potential energy of the bowling ball is given by:

U=mgh

where

m = 7.00 kg is the mass of the ball

g = 9.80 m/s^2 is the acceleration due to gravity

h = 2.00 m is the height above the ground

Substituting, we find

U=(7.00 kg)(9.8 m/s^2)(2.00 m)=137.2 J

deff fn [24]4 years ago
4 0
mgh =7*2*9.8=137.2. It should be the answer.
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A Roller Derby Exhibition recently came to town. They packed the gym for twoconsecutive weekend nights at South's field house. O
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Answer:

14.4 m/s

Explanation:

mass of Anna (Ma) = 68 kg

speed of Anna (Va) = 17 m/s

mass of SandraDay (Ms) = 76 kg

speed of SandraDay (Vs) = 12 m/s

We can find their speed (V) immediately after collision from the conservation of momentum where

(Ma x Va) + (Ms + Vs) = (Ma + Ms) x V

where V = speed immediately after collision

(68 x 17) + (76 + 12) = (68 + 76) x V

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An electron (restricted to one dimension) is trapped between two rigid walls 1.40 nm apart. The electron's energy is approximate
Svet_ta [14]

The quantum number of the energy state occupied by the electron is 10.

The given parameters;

  • <em>distance between the two rigid walls, L = 1.4 nm</em>
  • <em>energy of the electron, E = 19 eV</em>

The quantum number of the electron is calculated as follows;

E_n = \frac{h^2n^2}{8mL^2} \\\\

where;

  • <em>h is Planck's constant = 6.626 x 10⁻³⁴ Js</em>
  • <em>m is mass of electron = 9.11 x 10⁻³¹ kg</em>
  • <em>E is the energy of the electron = 19 x 1.602 x 10⁻¹⁹ J</em>
  • <em>n is the quantum number of the energy state occupied by the electron.</em>

n^2 = \frac{8mL^2E_n  }{h^2} \\\\n = \sqrt{\frac{8(9.11\times 10^{-31} )(1.4 \times 10^{-9})^2 (19\times 1.602 \times 10^{-19})  }{(6.626\times 10^{-34})2} } \\\\n \approx 10

Thus, the quantum number of the energy state occupied by the electron is 10.

Learn more here:brainly.com/question/19426524

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3 years ago
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