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Aleks04 [339]
3 years ago
7

A yellow ball with a mass of 2 kg is rolling across the floor at 3 m/s. A red ball with a mass of 3 kg is rolling across the sam

e floor at 3 m/s. Which ball has greater kinetic energy, and why?
Physics
2 answers:
Darina [25.2K]3 years ago
7 0

Answer:

The red ball has greater kinetic energy because it is moving at the same speed as the yellow ball, which is lighter than the red ball.

Explanation:

Formula for kinetic energy: 1/2mv²

Yellow ball:

= 1/2(2)(3)²

=1/2(2)(9)

= 9J

Red ball:

= 1/2(3)(3)²

=1/2(3)(9)

= 13.5J

kifflom [539]3 years ago
3 0

Answer:

The red ball has greater kinetic energy, because it has a greater mass.

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A. How many atoms of helium gas fill a spherical balloon of diameter 29.6 cm at 19.0°C and 1.00 atm? b. What is the average kine
Korolek [52]

Answer:

a) 3.39 × 10²³ atoms

b) 6.04 × 10⁻²¹ J

c) 1349.35 m/s

Explanation:

Given:

Diameter of the balloon, d = 29.6 cm = 0.296 m

Temperature, T = 19.0° C = 19 + 273 = 292 K

Pressure, P = 1.00 atm = 1.013 × 10⁵ Pa

Volume of the balloon = \frac{4}{3}\pi(\frac{d}{2})^3

or

Volume of the balloon = \frac{4}{3}\pi(\frac{0.296}{2})^3

or

Volume of the balloon, V = 0.0135 m³

Now,

From the relation,

PV = nRT

where,

n is the number of moles

R is the ideal gas constant = 8.314  kg⋅m²/s²⋅K⋅mol

on substituting the respective values, we get

1.013 × 10⁵ × 0.0135 = n × 8.314 × 292

or

n = 0.563

1 mol = 6.022 × 10²³ atoms

Thus,

0.563 moles will have = 0.563 × 6.022 × 10²³ atoms = 3.39 × 10²³ atoms

b) Average kinetic energy = \frac{3}{2}\times K_BT

where,

Boltzmann constant, K_B=1.3807\times10^{-23}J/K

Average kinetic energy = \frac{3}{2}\times1.3807\times10^{-23}\times292

or

Average kinetic energy = 6.04 × 10⁻²¹ J

c) rms speed = \frac{3RT}{m}

where, m is the molar mass of the Helium = 0.004 Kg

or

rms speed = \frac{3\times8.314\times292}{0.004}

or

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3 years ago
What lasts longer... a perm, or a chemical relaxer for your hair ?
Dmitrij [34]

Answer:

Perm lasts longer

Explanation:

Cuz a chemical relaxer only lasts a few weeks and a perm lasts a few months hope this helps

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2 years ago
In a double-slit experiment, light from two monochromatic light sources passes through the same double slit. The light from the
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Answer:

\lambda_2 = 573.3 nm

Explanation:

As we know that the position of maximum intensity on the screen is given as

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here we know that

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L = distance of the screen

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A solution that has a high concentration of hydrogen ions has what type of pH?
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I believe the answer is A.
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