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3 years ago

A singer raises his pitch one octave. What quality of the sound wave has changed?

2 answers:

6 0

If a singer raises his pitch by one octave this means that he has raised the frequency. So the frequency will be increased.

Frequency is the reciprocal of period which is the duration of time of one cycle in a repeating event.

Frequency and pitch are directly proportional. So the greater the pitch of the singer the greater its frequency gets increased.

This means the wavelength has also decreased as it is inversely proportional to the frequency.

Elanso [62]3 years ago

3 0

C). The amplitude has increased

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A block has two strings attached to it on opposite ends. One string has a force of 5 N,

juin [17]

Unless you have a diagram to include or any other additional info, I'll assume the block is being pulled by two opposing forces along the horizontal surface.

Horizontally, the block is under the influence of

• one rope pulling in one direction with magnitude 15 N,

• the other rope pulling in the opposite direction with mag. 5 N, and

• friction, opposing the direction of the block's motion, with mag. 3 N.

It stands to reason that the block is accelerating in the direction of the larger pulling force.

(A) By Newton's second law, we have

15 N + (-5 N) + (-3 N) = m (1 m/s²)

where m is the mass of the block. Solve for m :

7 N = m (1 m/s²)

m = (7 N) / (1 m/s²)

m = 7 kg

(B) The friction force is proportional to the normal force, so that if f is the mag. of friction and n is the mag. of the normal force, then f = µ n where µ is the coefficient of friction.

The block does not bounce up and down, so its vertical forces are balanced, which means the normal force and the block's weight (mag. w) cancel out:

n + (-w) = 0

n = w

n = m g

where g = 9.8 m/s² is the mag. of the acceleration due to gravity.

n = (7 kg) (9.8 m/s²)

n = 68.6 N

Then

3 N = µ (68.6 N)

µ = (3 N) / (68.6 N)

µ ≈ 0.044

4 0

3 years ago

Approximately how much heat energy does it take to raise 1 kg of water by 1 k?

Sidana [21]

Answer:

4186 Joules

Explanation:

The specific heat capacity of a substance is defined as the amount of heat needed to raise the temperature of 1 kg of the substance by 1 Kelvin. In formula,

$C_s = \frac{Q}{m \Delta T}$

where

Q is the amiunt of heat needed

m = 1 kg is the mass

$\Delta T = 1 K$

is the variation of temperature of the substance

For water, the specific heat capacity is $4186 J/(kg K)$ . This means that the heat energy required to raise 1 kg of water by 1 K is exactly 4186 J.

4 0

3 years ago

A lunar lander is making its descent to moon base i. the lander descends slowly under the retro-thrust of its descent engine. th

olga_2 [115]

V = final velocity
u = initial velocity
a = acceleration
s = displacement
Take downward direction as positive.
v^2 = u^2 + 2as
v^2 = 0.8^2 + 2(1.6)(5.5)
v^2 = 18.24
v = 4.27 m/s

5 0

4 years ago

Read 2 more answers

What’s Newton’s second law? Explain and mention some examples in daily life

Marina CMI [18]

Newton’s second law of motion is force equals mass times acceleration.

F = m•a

An example of this would be hitting a ball. If you hit the ball, it will move however fast you hit the ball. The harder you hit the ball, the faster it will move.

hope this helps and brainliest please

8 0

3 years ago

Why is it important for coastal areas exposed to destructive forces to be aware of the effects of these forces?

Fantom [35]

Answer:

the answer should be in the explanation

Explanation:

Volcanic Eruption

Cracks in the earth’s crust are called faults. Volcanoes and earthquakes usually occur along these faults. A volcanic eruption can lead to landslides, ash falls, mud-flows, pyroclastic flows (can burn everything in their way), and steam explosions. okay for example volcanoes people have to keep a close eye out when they live by an active search up valcanic damage and you will see what i mean

6 0

3 years ago