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iragen [17]
3 years ago
8

Bob is pushing a box across the floor at a constant speed of 1.2 m/s, applying a horizontal force whose magnitude is 75 N. Alice

is pushing an identical box across the floor at a constant speed of 2.4 m/s, applying a horizontal force.
What is the magnitude of the force that Alice is applying to the box?
F = N
Physics
1 answer:
Nadya [2.5K]3 years ago
6 0

Answer:75 N

Explanation:

Given

Bob is pushing the box with a force of 75 N with constant speed. Constant speed indicates that net force on the block is zero i.e. friction force is balancing the applied force.

so friction force f=75 N

If Alice is pushing an identical box with constant speed so net force acting on box must be equal to an applied force.

As the friction force is 75 N so Alice must be applying a force of 75 N  

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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
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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

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Now,

From the relation,

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where,

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on substituting the respective values, we get

1.013 × 10⁵ × 0.0135 = n × 8.314 × 292

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n = 0.563

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Thus,

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

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where,

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or

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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

rms speed = 1349.35 m/s

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