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3 years ago

10

The needle in the following diagram rotates around a fixed point in the middle. Based on the information given, what way will th

e needle rotate when the current is applied?

1 answer:

Ronch [10]3 years ago

3 0

Answer:

nods 40th anniversary rid off e 49en9 snns

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The current estimate for the age of earth of 4.57 ga comes from _____.

Whitepunk [10]

The estimation of the age of the Earth comes from scientists who studied the rock formation under the Earth's crust. They believe that during the Big Bang, the Earth, together with the other celestial bodies in the universe, were formed. Under the Earth's soil contain radioactive materials that have known decay rates. Using these rate, they undergo tests like rock dating to find the time of its existence.

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3 years ago

Consider a string with a length of (47.5 A) cm tied at both end (like on a stringed instrument). If the frequency of the first h

zubka84 [21]

To solve this problem it is necessary to apply the concepts related to wavelength as a function of frequency and speed, as well as to determine the wavelength as a function of length.

From the harmonic vibration generated we know that the total length of the string will be equivalent to a half of the wavelength, that is

$L = \frac{\lambda}{2} \rightarrow \lambda = 2L$

Where,

$\lambda =$ Wavelength

Therefore the wavelength for us would be,

$\lambda = 2*47.5cm = 95cm = 0.95m$

From the relationship of speed, frequency and wavelength we know that

$\lambda = \frac{v}{f} \rightarrow v = \lambda f$

$v = (0.95m)(245Hz)$

$v = 232.75 m/s$

Therefore the speed of the wave is 232.75m/s

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3 years ago

When a rattlesnake strikes, its head accelerates from rest to a speed of 32 m/s in 0.63 seconds. Assume for simplicity that the

irina [24]

Answer:

Power, P = 162.53 Watts

Explanation:

Given that,

Mass, m = 200 g = 0.2 kg

Initial speed of the snake, u = 0

Final speed of the snake, v = 32 m/s

Time, t = 0.63 s

Power of an object is given by :

$P=\dfrac{W}{t}$

$P=\dfrac{\Delta K}{t}$

$P=\dfrac{mv^2}{2t}$

$P=\dfrac{0.2\times (32)^2}{2\times 0.63}$

P = 162.53 Watts

So, the power of the rattlesnake is 162.53 Watts. Hence, this is the required solution.

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4 years ago

What’s the difference between expressed/implied powers, concurrent powers, and reserved powers?.

Lisa [10]

Answer:

A reserved power is a power specifically reserved to the states. Powers include setting up local governments and determining the speed limit. A concurrent power is a power that is given to both the states and the federal government.

Explanation:

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3 years ago

As waves pass by a duck floating on a lake, the duck bobs up and down but remains in essentially one place. explain why the duck

Rudiy27

The duck is not carried by the wave motion because <span>Waves move energy through a medium but don't transfer particles. So when the waves pass by a duck floating on a lake, the duck just bobs up and down, but remains in its place.</span>

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3 years ago