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3 years ago

Plz help to answer the sheet above thanks

Physics

1 answer:

AysviL [449]3 years ago

6 0

Answer:

(B) sound/kinetic

(E) Gravitational/kinetic

(F) mechanical/sound

Explanation:

(B) the useful energy transfer is sound but a by product of that is kinetic or mechanical energy because of the vibrations needed to make sound

(E) the useful energy transfer is Gravitational potential but a by product of that is kinetic or mechanical energy

(F) the useful energy transfer is kinetic or mechanical energy but the byproduct is noise and occasionally heat

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What is earths magnetism

vivado [14]

Answer:

Magmatism is the emplacement of magma within and at the surface of the outer layers of a terrestrial planet, which solidifies as igneous rocks. ... On Earth, magma forms by partial melting of silicate rocks either in the mantle, continental or oceanic crust.

Explanation:

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3 years ago

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A space station, in the form of a wheel 140 m in diameter, rotates to provide an "artificial gravity" of 3.90 m/s2 for persons w

Zigmanuir [339]

Radial acceleration is given by

$a_{rad}= \frac{v^2}{r}$
where

$v=r \omega$
then

$a_{rad}= \frac{r^2 \omega^2}{r}=r\omega^2$

Now

$70\omega^2=3.90 \frac{m}{s^2} \\ \\ \omega= \sqrt{ \frac{3.9}{70} }$

Using the relation

$\omega=2 \pi f$

$2 \pi f= \sqrt{ \frac{3.9}{70} }\\ \\ f= \frac{1}{2 \pi}\sqrt{ \frac{3.9}{70} }Hz$

Putting into rpm

$\frac{60}{2 \pi}\sqrt{ \frac{3.9}{70}} =2.254rpm$

8 0

4 years ago

lorasvet [3.4K]

Answer:

A) Option 1 is the correct answer.

B) Option 4 is the correct answer.

Explanation:

A) Weight of liquid = 7 N

Volume of liquid = 1 L = 0.001 m³

Specific weight = $\frac{7}{0.001}=7000N/m^3$

Density = $\frac{7000}{9.81}=713.5kg/m^3$

Specific gravity = $\frac{713.5}{1000}=0.7135$

Option 1 is the correct answer.

B) The Stokes(St) is the cgs physical unit for kinematic viscosity, named after George Gabriel Stokes.

We have

1 St = 10⁻⁴ m²/s

Option 4 is the correct answer.

7 0

3 years ago

Higher amplitudes sound will have a _____________________ sound while lower amplitude will have a __________________________ sou

lukranit [14]

Answer:

9) HIGHER AND LOWER INTESITY, 10) speed of sound must decrease.

11) guitar the strings, flute, 12) In the mountains, 13) sound of a low frequency horn (sub-wofeer)

Explanation:

In this exercise we are asked to complete the sentences.

9) the intensity of the sound is the square of the amplitude, the missing words are

HIGHER INTESITY

LOWER INTENSITY

10) the speed of sound is

v = $\sqrt{\frac{B}{\rho} }$

and it is also related to temperature

v = $v_o \sqrt{1+ \frac{T}{273} }$

We must be careful since the compressibility modulus (B) changes significantly between the solid, liquid and gaseous states, if we are in the same medium, the speed of sound decreases with increasing density. For a higher density the speed of sound decreases

Also the speed of sound increases with temperature, but its effect is less,

Therefore, by having these two effects in the opposite direction, the change in density is more important, so the speed of sound must decrease.

11) when you listen to a guitar the strings resonate with the instrument body

on the flute has a resonance between the blown air and the flute tube

12) When you are in front of a tall object, the sound is reflected and the echo is heard.

In the mountains, in the squares where there is a large object that reflects in sound

13) when we hear the sound of a low frequency horn (sub-wofeer) we feel the vibration of the air, this is an effect of the pressure energy of the sound on our chest

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3 years ago

However, sometimes levers are designed to increase the input force needed to move an object. Which of the following is most like

Tems11 [23]

What are the answer choices, if there are any?

6 0

4 years ago