3 years ago

Which of the following statements is "true" of imagined risks?

Physics

1 answer:

Leno4ka [110]3 years ago

4 0

I think its A- They're unaffected by positive self talk

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If an area receives a large amount of insulation is it likely to become warm or cold?

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Answer: heat

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Explanation:

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3 years ago

How many joules of heat would be required to heat 0.5 kg of aluminum by 2 kelvin

melisa1 [442]

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A machine lifts a 35 kg object doing 6860 J worth of work. How much power is produced by the machine if it lifts the object in 4

timofeeve [1]

Answer:

Explanation:

We need the power equation for this which is

P = Work/time

We have everything we need to solve this (the mass of the object is extra information):

P = 6860/4

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3 years ago

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A hockey puck with a mass of 0.175 kg slides over the ice. The puck initially slides with a speed of 5.25 m/s, but it comes to a

Neko [114]

Answer:

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Explanation:

The heat dissipated is the difference in the kinetic energies.

This is given by

$E = \frac{1}{2}mv_f^2 - \frac{1}{2}mv_i^2$

$v_i$ and $v_f$ are the initial and final velocities.

With <em>m</em> = 0.175 kg,

$E = \frac{1}{2}\times0.175(2.85^2 - 5.25^2) = -1.701\text{ J}$

The negative sign appears because energy is lost.

7 0

3 years ago