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3 years ago

A weather station records the wind as blowing from the northeast at 12 km/h.

Physics

1 answer:

weqwewe [10]3 years ago

7 0

Answer:

Explanation:

vector quantities always have spedd and direction

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Carlotta does 2000 j of work on a machine. The machine does 500 J of work what is the efficiency of this machine

almond37 [142]

Efficiency of a machine = (useful output energy) / (total input energy)

Efficiency = (500 J output work) / (Carlotta's 2,000 J input work)

Efficiency = (500 J) / (2,000 J)

Efficiency = 0.25

<em>Efficiency = 25%</em>

8 0

4 years ago

An object is approaching you while making a sound.

zvonat [6]

The pitch of the sound is perceived to be lower when an object is approaching you while making a sound.

<h3>What is sound?</h3>

Sound is a type of vibration capable of propagating in a suitable media (e.g., air or water).

The sound waves are called acoustic waves and they have a well-defined frequency and amplitude.

In conclusion, the pitch of the sound is perceived to be lower when an object is approaching you while making a sound.

Learn more about sound waves here:

brainly.com/question/1199084

#SPJ1

7 0

2 years ago

A mass is attached to an ideal spring. At time t = 0 the spring is at its natural length and the mass is given an initial veloci

JulijaS [17]

Answer:

t = T/4

Explanation:

The power delivered to the mass by the spring is work done by the spring per second.

$P = \frac{dW}{dt}$

The work done by the spring is equal to the elastic potential energy stored in the spring.

$U = \frac{1}{2}kx^2$

The maximum energy stored in the spring is at the amplitude of the oscillation.

$U_{max} =\frac{1}{2}kA^2$

So the first time the mass reaches to its amplitude can be found by the following equation of motion:

$x = A\cos(\omega t + \phi)\\\phi = \pi/2 ~because ~at ~t= 0, ~ x = 0\\0 = A\cos(0 + \pi/2)\\x = A\cos(\omega t + \pi/2)$

When the mass reaches the amplitude:

$A = A\cos(\omega t + \pi/2)\\1 = \cos(\omega t + \pi/2)\\\omega t + \pi/2 = \pi$

because cos(π) = 1.

$\omega t = \pi/2$

Using ω = 2π/T,

$\omega t = \pi/2\\\frac{2\pi}{T}t = \pi/2\\t = \frac{T}{4}$

4 0

4 years ago

The London Eye, which is a giant Ferris wheel, has a diameter of 135 m. It revolves at a constant rate and takes 30 minutes to c

Maurinko [17]

Answer:

Linear velocity of a rider in a capsule that is located at the perimeter of the wheel = 0.2355 m/s

Explanation:

Diameter = 135 m

Radius, r = 0.5 x 135 = 67.5 m

It revolves at a constant rate and takes 30 minutes

Period, T = 30 minutes= 1800 s

$\texttt{Angular velocity, }\omega =\frac{2\pi }{T}=\frac{2\pi }{1800}=3.49\times 10^{-3}rad/s$

Linear velocity, v = radius x angular velocity

v = 67.5 x 3.98 x 10⁻³ = 0.2355 m/s

Linear velocity of a rider in a capsule that is located at the perimeter of the wheel = 0.2355 m/s

6 0

3 years ago

Fe2(co3)3 number of atoms

Vera_Pavlovna [14]

Answer:

14 atoms

Explanation:

Number of atoms in Fe₂(CO₃)₃

An atom is the smallest indivisible particle that takes part in a chemical reaction.

In Fe₂(CO₃)₃; we have:

Elements Number of atoms

Fe 2

C 3

O 3(3) = 9

Total number of atoms = 2 + 3 + 9 = 14 atoms

7 0

3 years ago