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2 years ago

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Physics

2 answers:

sukhopar [10]2 years ago

4 0

<span>C. Infrared waves have lower frequency than UV rays.</span>

vivado [14]2 years ago

4 0

Answer:

Explanation:

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A factory worker pushes a 31.0 kg crate a distance of 4.20 m along a level floor by pushing downward at an angle of 32.0 ∘ below

Darina [25.2K]

Answer:

$W_{fr} = 281.539\,J$

Explanation:

The kinetic force of friction is:

$f = (0.260)\cdot (31\,kg) \cdot (9.807\,\frac{m}{s^{2}})\cdot \cos 32^{\textdegree}$

$f = 67.033\,N$

Before calculating work, it is require to determine if force exerted on the crate is enough to move it at least. The equation of equilibrium for the crate is:

$\Sigma F = F - f + m\cdot g \cdot \sin \theta = m \cdot a$

The acceleration experimented by the crate is:

$a = \frac{F-f}{m} + g\cdot \sin \theta$

$a = \frac{118\,N-67.033\,N}{31\,kg}+(9.807\,\frac{kg}{m^{2}} )\cdot \sin 32^{\textdegree}$

$a = 6.841\,\frac{m}{s^{2}}$

This positive result indicates that motion is physically reasonable. Hence, the work done by the force of friction is:

$W_{fr} = (67.033\,N)\cdot (4.20\,m)$

$W_{fr} = 281.539\,J$

8 0

3 years ago

An organ pipe is open at both ends. It is producing sound

ozzi

To solve this problem we will apply the concepts related to the wavelength of its third harmonic.

It describes that the wavelength is equivalent to

$\lambda = \frac{2}{3}L$

Here,

$\lambda = Wavelength$

The wavelength is in turn described as a function that depends on the change of the speed as a function of the frequency, that is to say

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

In this case the speed is equivalent to the speed of sound and the frequency was previously given, therefore

$\lambda = \frac{343}{262}$

$\lambda = 1.3091m$

Finally the length of the pipe would be

$L= \frac{3}{2}(1.3091)$

$L = 1.963m$

3 0

2 years ago

Planet-solar system-galaxy-local group. what comes next

Lubov Fominskaja [6]

Answer:

Super cluster

Explanation:

3 0

2 years ago

Energy that is stored due to types of bonds and arrangement of atoms refers to ___________ energy

Bingel [31]

Potential energy is in short, stored energy

5 0

2 years ago

Read 2 more answers

A 25.0 g marble sliding to the right at 20.0 cm/s overtakes and collides elastically with a 10.0 g marble moving in the same dir

ikadub [295]

In collision that are categorized as elastic, the total kinetic energy of the system is preserved such that,

KE1 = KE2

The kinetic energy of the system before the collision is solved below.

KE1 = (0.5)(25)(20)² + (0.5)(10g)(15)²
KE1 = 6125 g cm²/s²

This value should also be equal to KE2, which can be calculated using the conditions after the collision.

KE2 = 6125 g cm²/s² = (0.5)(10)(22.1)² + (0.5)(25)(x²)

The value of x from the equation is 17.16 cm/s.

Hence, the answer is 17.16 cm/s.

6 0

2 years ago