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faltersainse [42]
3 years ago
10

Which scenario is an example of the transfer of thermal energy by radiation?

Physics
2 answers:
Mumz [18]3 years ago
6 0

Answer:the answer is B

Explanation: just took the quiz

g100num [7]3 years ago
6 0

Answer:

B. A microwave oven causes water molecules in a cup to vibrate

faster.

Explanation:

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What is the equivalent resistance in this circuit?<br>What is the current in this circuit?
ololo11 [35]

Answer:

15 ohm

3 A

Explanation:

R =15 ohm  (series = summation)

I= V/R = 45 / 15 = 3 A

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3 years ago
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A wave has a frequency of 775 Hz. What is its period?
Leto [7]

The period is simply the inverse of the frequency, therefore:

T = 1 / f

T = 1 / 775 Hz

T = 0.001290 s    → possible answer

T = 1.29 × 10⁻³ s   → possible answer

T = 1.29 ms          → possible answer

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How do the properties of waves correspond with observations of waves?
Sveta_85 [38]

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7 0
2 years ago
A centrifuge used in DNA extraction spins at a maximum rate of 7000rpm producing a "g-force" on the sample that is 6000 times th
defon

Answer:

A) a = 73.304 rad/s²

B) Δθ = 3665.2 rad

Explanation:

A) From Newton's first equation of motion, we can say that;

a = (ω - ω_o)/t. We are given that the centrifuge spins at a maximum rate of 7000rpm.

Let's convert to rad/s = 7000 × 2π/60 = 733.04 rad/s

Thus change in angular velocity = (ω - ω_o) = 733.04 - 0 = 733.04 rad/s

We are given; t = 10 s

Thus;

a = 733.04/10

a = 73.304 rad/s²

B) From Newton's third equation of motion, we can say that;

ω² = ω_o² + 2aΔθ

Where Δθ is angular displacement

Making Δθ the subject;

Δθ = (ω² - ω_o²)/2a

At this point, ω = 0 rad/s while ω_o = 733.04 rad/s

Thus;

Δθ = (0² - 733.04²)/(2 × 73.304)

Δθ = -537347.6416/146.608

Δθ = - 3665.2 rad

We will take the absolute value.

Thus, Δθ = 3665.2 rad

8 0
3 years ago
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