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gladu [14]
3 years ago
12

When a rattlesnake strikes, its head accelerates from rest to a speed of 23 m/s in 0.39 seconds. Assume for simplicity that the

only moving part of the snake is its head of mass 110 g. How much (average) power does the rattlesnake need to accelerate its head that fast
Physics
1 answer:
pickupchik [31]3 years ago
6 0

Explanation:

P = Energy expended/time

= 0.5×0.11×23²/0.39

= 74.6 Watt

plz check am not sure

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What is the oxidation number of the element Se
maria [59]

Answer:

The oxidation number of a monatomic (composed of one atom) ion is the same as the charge of the ion. For example, the oxidation numbers of K+, Se2−, and Au3+ are +1, -2, and +3, respectively. The oxidation number of oxygen in most compounds is −2.

Explanation:

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3 years ago
Consider the resistances of short and open circuits. Fill in the blanks: The voltage across a short circuit will always be _____
aleksandr82 [10.1K]

Answer:

a) Zero

b) power source

Explanation:

According to Ohm's law, the voltage dropped in a resistance is proportional to the current flow and the resistor opposing to it.

V=I*R

For the case of a short circuit, the resistance tends to zero, so the voltage will tend to zero too.

In the case of the open circuit, the resitance will tend to infinity, because we cannot obtain an infite voltage, it will be limited by the power source.

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3 years ago
What temperature is required to transfer waste heat to the environment for a heat engine to be 100 percent efficient?
OLEGan [10]
This can be seen as a trick question because heat engines can typically never be 100 percent efficient. This is due to the presence of inefficiencies such as friction and heat loss to the environment. Even the best heat engines can only go up to around 50% efficiency.
6 0
3 years ago
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Light travels 186,282 miles in one second. A light year is the distance light travels in one year. It is about 4.3 light years t
deff fn [24]

Answer:

2.5278035226\times 10^{13}\ miles

1994.7944465 miles

46390568.5227 miles

125 ft

Explanation:

1\ ly=186282\times 365.25\times 24\times 60\times 60=5.8786128432\times 10^{12}\ mi

4.3\ ly=4.3\times 5.8786128432\times 10^{12}=2.5278035226\times 10^{13}\ miles

The distance is 2.5278035226\times 10^{13}\ miles

2000\ miles=0.01\ in

2.5278035226\times 10^{13}\times \dfrac{1}{2000}=1.2639017613\times 10^{10}\ LA\ to\ NY

Converting to inches

1.2639017613\times 10^{10}\times 0.01=126390176.13\ in/LA\ to\ NY

Converting to miles

126390176.13\times\dfrac{1}{5280\times 12}=1994.7944465\ inches/LA\ to\ NY

The distance is 1994.7944465 miles

5.8786128432\times 10^{17}\times \dfrac{1}{2000}\times 0.01\times\dfrac{1}{5280\times 12}=46390568.5227\ miles

The distance is 46390568.5227 miles

5.8786128432\times 10^{12}\times 15\times 10^{9}=8.8179192648\times 10^{22}

8.8179192648\times 10^{22}\times \dfrac{1}{5.8786128432\times 10^{17}}=150000\ MW\ dia

150000\dfrac{1}{100\times 12}=125\ ft

The distance is 125 ft

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4 years ago
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