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3 years ago

What is 2.0 ft × 4 ft, to the correct number of significant figures?

1 answer:

4 0

The correct number of significant figures is always the smallest number of significant figures given. So when you're talking about 2.0 and 4, 4 is the number with smallest number of significant figures, in this case 1 significant figure.

This means that 2.0 ft x 4 ft = 8 ft.

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3 years ago

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Which of the following types of electromagnetic radiation has the lowest energy?

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UV rays have the lowest energy, (highest wavelengths)

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2 years ago

A 50-g chunk of 80 degrees C iron is dropped into a cavity in a very large block of ice at 0 degrees C. Show that 5.5 g of ice w

Alenkasestr [34]

Answer:

5.5g of ice melts when a 50g chunk of iron at 80°C is dropped into a cavity

Explanation:

The concept to solve this problem is given by Energy Transferred, the equation is given by,

$Q = mc\Delta T$

Where,

Q= Energy transferred

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c = specific heat capacity

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Replacing the values where mass is 50g and temperature is 80°C to 0°C we have,

$Q = mc\Delta T$

$Q = 50*0.11*(80-0)$

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Then we can calculate the heat absorbed by m grams of ice at 0°C, then

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How Q_1=Q_2, so

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3 years ago

A model train engine was moving at a constant speed on a straight horizontal track. As the engine moved along, a marble was fir

bagirrra123 [75]

Answer:

The marble was moving in a projectile and the speed of the engine was 2.716 m/s

Explanation:

The vertical component of the marble's flight path relative to the train

is given by the equation y(t) = v*t - (4.9)*t^2,

where, v is the initial upward velocity of the marble relative to the train.

So with y(1) = v - 4.9 = 0 we have

v = 4.9 m/s.

The marble will reach maximum height after 0.5 seconds, at which the

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Now, the marble has a vertical velocity component of 4.9 m/s and a horizontal velocity component

of V m/s such that tan(61) = 4.9 / V

V = 4.9 / tan(61) = 2.716 m/s

This horizontal velocity component of the marble is the same as the

speed of the train i.e. 2.716 m/s.

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3 years ago

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