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3 years ago

6

Use the drop-down menus to explain how noise cancellation works. Waves with similar are created to interfere with unwanted sound

waves. The of one wave overlap with the troughs of the other wave, causing the two waves to cancel out each other.

2 answers:

leonid [27]3 years ago

8 0

Amplitudes, and Crests

USPshnik [31]3 years ago

7 0

Answer:

1. Amplitudes and 2. Crests

Explanation:

I got it right I promise :)

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It takes me 12s to lift a box upward with 20 N of force to a height of 45m. What was my power output ?

Finger [1]

Answer:

75Watts

Explanation:

Given parameters:

Time = 12s

Force applied = 20N

Height = 45m

Unknown:

Power output = ?

Solution:

Power is defined as the rate at which work is done.

It is mathematically expressed as;

Power = $\frac{work done}{time}$

Work done = force x distance = 20 x 45 = 900J

Power = $\frac{900}{12}$ = 75Watts

6 0

3 years ago

the nuciel of all atoms are made of which subatomic particles A. electrons and protons B. protons and neutrons c. protons neutro

marshall27 [118]

B Protons and neutrons. Electrons are outside the nucleus.

8 0

3 years ago

A wheel of radius R = 0.80 m is pulled by a rope looped around a frictionless axle. The total mass of the wheel and axle assembl

iragen [17]

Answer:

$\frac{K_T}{K_R}=\frac{600J}{188.63J}=3.18$

Explanation:

To find the rotational kinetic energy you first calculate the angular acceleration by using the following formula:

$\tau=I\alpha\\\\FR=I\alpha\\\\\alpha=\frac{FR}{I}$

F: force applied

R: radius of the wheel

I: moment of inertia

$\alpha=\frac{(120N)(0.80m)}{26.88kgm^2}=3.57\frac{rad}{s^2}$

With this value you calculate the angular velocity:

$\omega^2=\omega_o^2+2\alpha \theta\\$

you calculate how many radians the wheel run in 5.0m

$\theta=\frac{2\pi (0.8m)}{5.0m}=\approx1.00rad$

$\omega=\sqrt{2(3.57\frac{rad}{s^2})(1.00rad)}=2.67\frac{rad}{s}$

Next, you use the formula for the rotational kinetic energy:

$K_R=\frac{1}{2}I\omega^2=(26.88)(2.67)^2 J = 188.63J$

For the transnational kinetic energy you use the following equation:

$W=\Delta K_T$ (net work equals the change in the kinetic energy).

By replacing the you obtain:

$\Delta K_T=Fd=(120)(5.0)J=600J$

Finally, the ratio between translational rotational kinetic energy is:

$\frac{K_T}{K_R}=\frac{600J}{188.63J}=3.18$

hence, translational kinetic energy is three times the rotational kinetic energy.

6 0

3 years ago

An electric clothes dryer draws 15 a of current from a 240-v wall outlet. how much power, in watts, does it use?

Nataly [62]

The power consumed by the electric clothes dryer may be calculated by the following equation,

P = I x V

where P is the power, I is the current in amperes, and V is the voltage in volts. Substituting the known values from the given above,

P = (15 A)(240 V)
P = 3600 watts

Therefore, the power consumed by the electric clothes dryer is equal to 3600 watts.

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4 years ago

Which statement describes the formation of a nebula? A. An elliptical flattened disk begins. B. A bulging core with irregular st

max2010maxim [7]

D is the answers Gases from a dead star gather and contract.

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3 years ago