A 30 kg rock sits motionless on the ground. What is the normal force on the rock?

The speed of sound in air is 345 m/s. A tuning fork vibrates above the open end of a sound resonance tube. If sound waves have w

anzhelika [568]

Answer:

594.8 Hz

Explanation:

Parameters given:

Speed of sound, v = 345 m/s

Wavelength = 58 cm = 0.58 m

Speed of a wave is given as:

Speed = wavelength * frequency

Therefore:

Frequency = Speed/Wavelength

Frequency = 345/0.58

Frequency = 594.8 Hz

8 0

3 years ago

What were the physical activities in your childhood that you still do today? Do you spend more time now in doing these activitie

user100 [1]

I used to play tag or run around a lot and sometimes i do these activities but its a lot less now that i am older

5 0

4 years ago

find out how was life like in ancient China by exploring the engineering and metal technology of Ancient China. Gather some poin

scZoUnD [109]

The grand canal was built to make easier the transportation of grains to the power center of north china.

<h3>How was the Grand Canal built?</h3>

The canal was built in order to connect the Yellow River in the north with the Yangtze River in the south. This canal is built for making easier the transportion of grain from the south to the centers of north China. The total length of the Grand Canal is 1,776 km.

So we can conclude that the grand canal was built to make easier the transportation of grains to the power center of north china.

Learn more about technology here: brainly.com/question/25110079

5 0

2 years ago

explain why for thousands of years people believed that stars moved across Earth's sky. Explain why we now have a different expl

Anarel [89]

Answer:

Ptolemy proposed a model, he reference system is centered on the Earth

Copernicus, proposed a deferent system, this system is centered on the Sun, where it is at the origin of the system

Explanation:

Thousands of years ago, Ptolemy proposed a model to explain the movement of the planets and stars in the sky, in this model the reference system is centered on the Earth, so each body is orbiting in different spheres around the Earth as its center, this system had very complicated calculations and curves to be able to explain the orbits of the planets.

More recently Copernicus, proposed a deferent system, this system is centered on the Sun, where it is at the origin of the system, in this system the movement of the planets are ellipses, which is a much simpler explanation and has been widely accepted, in current systems the reference system is fixed in the bodies more massive, since this simplifies the explanation of the movements.

6 0

3 years ago

A 19 kg solid disk of radius0.44 m is rotated about an

Vlad1618 [11]

Answer:

0.915 Nm

Explanation:

1 revolution = 2π rad

We can use the following equation of motion to find out the acceleration acting on the disk

$\omega^2 - \omega_0^2 = 2\alpha\Delta \theta$

where $\omega v = 2.5 rad/s is the final angular velocity of the disk, [tex]\omega_0$ = 0 rad/s is the initial velocity of the can when it starts from rest, $\Delta \theta$ is the angular distance traveled, $\alpha$ is the angular acceleration of the disk, which we care looking for: