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3 years ago

6

high frequency sound waves have a shorter wavelength and a higher A. amplitude B. pitch C. wavelength? than low frequency sound

waves

2 answers:

gizmo_the_mogwai [7]3 years ago

8 0

Pitch of the sound increases as frequency increases.
choose B pitch

velikii [3]3 years ago

4 0

Answer:

its B

Explanation:

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A 45.0-kg sample of ice is at 0.00°C. How much heat is needed to melt it? For water, Lf=334 kJ/kg and Lv=2257 kJ/kg

Aleonysh [2.5K]

Heat required to change the phase of ice is given by

Q = m* L

here

m = mass of ice

L = latent heat of fusion

now we have

m = 45 kg

L = 334 KJ/kg

now by using above formula

$Q = 45 * 334 * 10^3$

$Q = 1.5 * 10^7 J$

In KJ we can convert this as

$Q = 1.5 * 10^4 kJ$

so the correct answer is D option

7 0

3 years ago

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a volleyball is hit upward with an initial velocity of 7.5 m/s. calculate the displacement of the volleyball when its final velo

Luden [163]

Answer:

The displacement of the volleyball is 2.62 m

Explanation:

Given;

initial velocity of the volleyball, u = 7.5 m/s

final velocity of the volleyball, v = 2.2 m/s

displacement of the volleyball, d = ?

Apply the following kinematic equation;

v² = u² - 2gd

2gd = u² - v²

$d = \frac{u^{2}-v^{2} }{2g}\\\\d = \frac{7.5^{2}-2.2^{2} }{2*9.8}\\\\d = 2.62 \ m$

Therefore, the displacement of the volleyball is 2.62 m

7 0

3 years ago

PLEASE HELP ME WITH MY QUIZ!!!!

egoroff_w [7]

Answer:

The answer is b the radiation of the suns electromagnetic waves

Explanation:

I took the Quiz to.

6 0

3 years ago

Two coils have the same number of circular turns and carry the same current. Each rotates in a magnetic field acting perpendicul

ANEK [815]

Answer:

4.14 cm.

Explanation:

Given,

For Coil 1

radius of coil, r₁ = 5.6 cm

Magnetic field, B₁ = 0.24 T

For Coil 2

radius of coil, r₂ = ?

Magnetic field, B₂ = 0.44 T

Using formula of maximum torque

$\tau_{max}= NIAB$

Since both the coil experience same maximum torques

now,

$NIA_1B_1 = NIA_2B_2$

$A_1B_1 = A_2B_2$

$r_1^2 B_1 = r_2^2 B_2$

$5.6^2\times 0.24= r_2^2\times 0.44$

$r_2 = 4.14\ cm$

Radius of the coil 2 is equal to 4.14 cm.

4 0

4 years ago

Por favor, necesito ayuda urgente 4. vectores perpendiculares de 25 y 40 unidades cada uno. Hallar gráfica y numericamente el ve

Darina [25.2K]

Answer:

4) R = 47.17 units , 5) R= 10,29 unidades, 6) R= 2994,4 km , θ = -33,7

Explanation:

Este es un ejercicio de adición de vectores

4) como los vectores son perpendiculares.

Para encontrar la resultante podemos usar el teorema de pitoras

R = √ a² + b²

R = √√ ( 25² + 40²)

R = 47,17 unidades

5) Este caso como el angulo es diferente de 90 debemos usar la relación de pitoras completa

R² = a² + b² + 2 a b cos θ

donde el angulo es entre los vectores a y b

R² = 12² + 16² – 2 12 16 cos 40

R²= 400 – 294,16

R= 10,29 unidades

6) En este caso los dos desplazamientos son perpendiculares, por lo cual Usamos el teorema de Pitágoras

R = √ (2400² + 1600²)

R= 2994,4 km

para el angulo de este desplazamiento usamos trigonometría

tan θ = y/x

θ = tan⁻¹ y/x

θ = tan⁻¹ 1600/(-2400)

θ = -33,7

TRASLATE

This is a vector addition exercise

4) as the vectors are perpendicular.

To find the result we can use the Poreor theorem

R = √ a² + b²

R = √ (25² + 40²)

R = 47.17 units

5) This case, as the angle is different from 90, we must use the complete ratio of the pitoras

R² = a² + b² + 2 a b cos θ

where the angle is between vectors a and b

R² = 12² + 16² - 2 12 16 cos 40

R² = 400 - 294.16

R = 10.29 units

6) In this case the two displacements are perpendicular, which is why we use the Pythagorean theorem

R = √ (2400² + 1600²)

R = 2,994.4 km

for the angle of this displacement we use trigonometry

tan θ = y / x

θ = tan⁻¹ y / x

θ = tan⁻¹ 1600 / (- 2400)

θ = -33.7

3 0

3 years ago