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BARSIC [14]
3 years ago
9

Juan is making ice tea. When he adds ice to the tea, why does the tea cool down?​

Physics
1 answer:
Tresset [83]3 years ago
4 0

Answer: because the ice was cold, and it melted in the tea. So the tea is now cooler.

Explanation:

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Check all that apply. An ammeter is used to measure current. An ammeter must be placed in parallel with a resistor to measure th
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<u>Out of all given choices, the following statements are true:</u>

  • An ammeter is used to measure current.
  • A voltmeter is used to measure voltage.
  • A voltmeter must be placed in parallel with a resistor to measure the voltage across the resistor.

Options A, E, and F

<u>Explanation:</u>

An instrument by which the current in a circuit is measured is  called ammeter whereas an instrument in which voltage is measured in a circuit is called a voltmeter . The ammeter is placed in series with the resistor while the voltmeter is placed in parallel with the resistor.

For the option B, since the ammeter must be placed in series with the resistor to measure current, it is false. Option C is false because an ammeter has zero internal resistance. Option D is also false because a voltmeter has a high internal resistance and is actually infinite.

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Gyutwag you so very well
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Find out the three methods of energy transfer (conduction, convection and radiation). think about
Anvisha [2.4K]

Explanation:

conduction- putting a metal spoon in fire

convection- boiling water. In ventilation

Radiation- suns heat reaches us by radiation. heat from fire place reaches us by radiation.

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Which of these would best define sound intensity? A) how fast the wave is traveling B) the frequency of the sound wave the power
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Which of these would best define sound intensity?

A) how fast the wave is travelling

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4 years ago
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A uniform rod with a mass of 100 g and a length of 50.0 cm rotates in a horizontal plane about a fixed vertical, frictionless pi
Alex787 [66]

(a) The angular speed of the system at the instant the beads reach the end of the rod is 9.26 rad/s.

(b) The angular speed of the rod after the after the beads fly off the rod's ends is 25.71 rad/s.

<h3>Moment of inertia through the center of the rod</h3>

I = ¹/₁₂ML²

I =  ¹/₁₂ (0.1)(0.5)²

I = 0.0021 kgm²

For the beads, I = 2Mr² = 2(0.03 x 0.1²) = 0.0006 kgm²

Total initial moment of inertia, Ii = 0.0021 kgm² + 0.0006 kgm²

I(i)= 0.0027 kgm²

When the beads reach the end, I = 2Mr² = 2(0.03)(0.25)² = 0.00373 kgm²

Total final moment of inertia, I(f) = 0.0021 kgm²  +  0.00373 kgm²

I(f) = 0.00583 kgm²

<h3>Speed of the system</h3>

The speed of the system at the moment the beads reach the end of the rod is calculated as follows;

I_i \omega_i = I_f\omega _f\\\\\omega _f = \frac{I_i \omega_i}{I_f}

\omega_f = \frac{0.0027 \times 20}{0.00583} \\\\\omega _f = 9.26 \ rad/s

<h3>Speed of the rod when the beads fly off</h3>

\omega_f = \frac{0.0027 \times 20}{0.0021} \\\\\omega _f = 25.71 \ rad/s

Learn more about moment of inertia of rods here: brainly.com/question/3406242

5 0
3 years ago
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