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4 years ago

When the kinetic energy of an object changes, energy is transferred to or from the object.

1 answer:

8 0

That's a true statement ... not a question.

When the kinetic energy of an object changes, energy
may be transferred either to or from the object.

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Assuming a roughly spherical shape and a density of 4000 kg/m3, estimate the diameter of an asteroid having the average mass of

vredina [299]

Explanation:

It is given that,

Density of asteroid, $\rho=4000\ kg/m^3$

Mass of asteroid, $m=10^{17}\ kg$

We need to find the diameter of the asteroid. The formula of density is given by:

$\rho=\dfrac{m}{V}$

V is the volume of spherical shaped asteroid, $V=\dfrac{4}{3}\pi r^3$

$r^3=\dfrac{3M}{4\pi \rho}$

$r^3=\dfrac{3\times 10^{17}\ kg}{4\pi \times 4000\ kg/m^3}$

$r^3=\sqrt{5.96\times 10^{12}}$

r = 2441311.12 m

Diameter = 2 × radius

d = 4882622.24 m

$d=4.88\times 10^6\ m$

Hence, this is the required solution.

8 0

3 years ago

Select the statement that correctly completes the description of phase difference.

KengaRu [80]

Answer:

The difference in the phase angle between any two waves at any given position along the waves.

Explanation:

Phase difference describes the difference in the phase angle between any two waves at any given position along the waves. The equation of wave is given by :

Wave 1, $y=A\ sin(\omega t)$

Wave 2, $y=A\ sin(\omega t+\phi)$

Where

A is the amplitude of wave

$\omega$ is the angular frequency

$\phi$ is the phase difference between two waves

If $\Delta d$ is the path difference, it is given by :

$\Delta d=d\ sin\theta$

Hence, the correct option is (a) "the difference in the phase angle between any two waves at any given position along the waves".

3 0

4 years ago

Suppose a standing wave created on a spring that is 10.5 m long has a speed of 14 m/s and a frequency of 2 Hz. How many nodes an

dimulka [17.4K]

Answer:

If the two waves have the same amplitude and wavelength, then they alternate between ... In fact, the waves are in phase at any integer multiple of half of a period: ... The propagation velocity of the waves is 175 m/s.

Explanation:

please ask me in brainlist ok

6 0

3 years ago

A crate of 890 kg gets raised to a height of 2.1m. Calculate the crate's gravitational potential energy.

mars1129 [50]

Answer:

18,316.2

Explanation:

The formula for GPE is mgh, where

M = Mass of the object

G = Acceleration due to gravity (9.8 m/s^2 on Earth)

H = Height above ground

890 × 9.8 × 2.1 = 18,316.2

4 0

3 years ago

Read 2 more answers

At a distance of 8 m, the sound intensity of one speaker is 66 dB. If we were to place 3 speakers in a circle of radius 8 m, wha

ludmilkaskok [199]

Answer:

dβ = 70. 77 dβ

Explanation:

The intensity of sound in decibels is

dβ = 10 log I/I₀

let's look for the intensity of this signal

I / I₀ = 10 dβ/10

I / I₀ = 3.981 10⁶

the threshold intensity of sound for humans is I₀ = 1 10⁻¹² W / m²

I = 3.981 10 ⁶ 1 10⁻¹²

I = 3,981 10⁻⁶ W / m²

It is indicated that 3 cornets are placed in the circle, for which total intensity is

I_total - 3 I

I_total = 3 3,981 10⁻⁶

I_total = 11,943 10⁻⁶ W / m²

let's reduce to decibels

dβ = 10 log (11,943 10⁻⁶/1 10⁻¹²)

dβ = 10 7.077

dβ = 70. 77 dβ

3 0

3 years ago