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3 years ago

A girl on the beach sees 8 waves pass in 4 s. If the wavelength of each

Physics

2 answers:

kipiarov [429]3 years ago

8 0

Velocity = frequency x wavelength

= $\frac{8}{4}$ x 1.2

= 0.6 m/s

fenix001 [56]3 years ago

5 0

Answer:

The velocity of wave is 2.4m/s.

Explanation:

First, find the frequency using the formula :

$f = \frac{1}{t}$

Let t = 4,

$f = \frac{1}{4}$

$f = 0.25Hz$

Next, given that each wave is 1.2m and there are 8 waves so the wavelength is :

$λ = 1.2 \times 8$

$λ = 9.6m$

Lastly, you have to use velocity formula :

$v = f \times λ \:$

Let f = 0.25Hz,

Let λ = 9.6m,

$v = 0.25 \times 9.6$

$v = 2.4$

(Correct me if I am wrong)

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A single strain gage has a nominal resistance of 120 ohm. For a quarter bridge with 120 ohm fixed resistors, strain gauge factor

natita [175]

Answer:

Output voltage is 1.507 mV

Solution:

As per the question:

Nominal resistance, R = $120\Omega$

Fixed resistance, R = $120\Omega$

Gauge Factor, G.F = 2.01

Supply Voltage, $V_{s} = 3\ V$

Strain, $\epsilon = 1000\times 10^{-6}\ strain$

Now,

To calculate the output voltage, $V_{o}$ :

WE know that strain is given by:

$\epsilon = \frac{(R + R')^{2}V_{o}}{RR'V_{s}\times G.F}$

Thus

$V_{o} = \frac{RR'V_{s}\epsilon \times G.F}{(R + R')^{2}}$

Now, substituting the suitable values in the above eqn:

$V_{o} = \frac{120\times 120\times 3\times 1000\times 10^{-6}\times 2.01}{(120 + 120)^{2}}$

$V_{o} = 1.507\ mV$

6 0

3 years ago

Something that might happen because of global warming is: __________. *

gogolik [260]

Answer:

melting polar icecaps seems the best, hopes this helps!

6 0

3 years ago

A box slides down a frictionless incline, gaining speed. The work done by the normal force n is _______.

jeka57 [31]

The work done by the normal force n when the box slides down a frictionless incline and gaining speed is zero.

<h3>What is normal force?</h3>

The force of contact is called the normal force. When the two surfaces are in contact with each other, then the normal force acts.

This force is applied by the solid bodies on each other in order to prevent the passing through each other.

A box slides down a frictionless incline, gaining speed. For this box, the value of work done by normal force has to be found out. Let's analyze the given condition.

The body is gaining the speed, which means there is a change in kinetic energy.
The change in kinetic energy is equal to the work done.
The friction force is the product of coefficient of the friction and normal force.
The friction force for the given case is zero. Thus, the normal force must be equal to the zero.