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olchik [2.2K]
3 years ago
13

A 75 Kg skateboarder is riding downhill, exerting 25 N. What is their acceleration?

Chemistry
1 answer:
Hunter-Best [27]3 years ago
4 0

Answer:

<h3>The answer is 0.33 m/s²</h3>

Explanation:

The acceleration of an object given it's mass and the force acting on it can be found by using the formula

a =  \frac{f}{m}  \\

where

m is the mass

f is the force

a is the acceleration

From the question

f = 25 N

m = 75 kg

We have

a =  \frac{25}{75}   =  \frac{1}{3}  \\  = 0.333333333...

We have the final answer as

<h3>0.33 m/s²</h3>

Hope this helps you

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3 years ago
How much heat must be transferred to 1600 g of iron to change the iron's
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Answer:

A. 8600 J

General Formulas and Concepts:

<u>Thermochemistry</u>

Specific Heat Formula: q = mcΔT

  • q is heat (in J)
  • m is mass (in g)
  • c is specific heat (in J/g °C)
  • ΔT is change in temperature (in °C)

Explanation:

<u>Step 1: Define</u>

[Given] <em>m</em> = 1600 g

[Given] ΔT = 214 °C - 202 °C = 12 °C

[Given] <em>c</em> = 0.450 J/g °C

[Solve] <em>q</em>

<u>Step 2: Find Heat</u>

  1. Substitute in variables [Specific Heat Formula]:                                           q = (1600 g)(0.450 J/g °C)(12 °C)
  2. Multiply [Cancel out units]:                                                                             q = (720 J/°C)(12 °C)
  3. Multiply [Cancel out units]:                                                                             q = 8640 J

<u>Step 3: Check</u>

<em>Follow sig fig rules and round. We are given 2 sig figs as our lowest.</em>

8640 J ≈ 8600 J

Topic: AP Chemistry

Unit: Thermodynamics

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2. Mixture: It is basically presence of two or more compounds in which there is no chemical bonds.

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hope this helps!:)

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