3 years ago

The wavelength of a sound wave is 30 m. The frequency is 7 Hz. What is the wave speed?

Physics

1 answer:

maria [59]3 years ago

3 0

Answer:

210m/s

Explanation:

To find the speed of wave you need to multiply the wave length with the frequency.

You might be interested in

In order to be considered a semi-conductor the material must

wel

First one, for instance they become conductors or insulators depending on the temperature!

4 0

4 years ago

Read 2 more answers

_____ is the total kinetic energy of particles in an object.

maw [93]

Thermal energy (or thermal kinetic energy) is the total kinetic energy of particles in an object

hope this helps

4 0

3 years ago

A 10000 N net force is accelerating a car at a rate if 5.5 m/s^2. What is the cars’s mass?

lianna [129]

Answer:

1800 kg

Explanation:

Newton's second law:

F = ma

10000 N = m (5.5 m/s²)

m ≈ 1800 kg

8 0

3 years ago

Read 2 more answers

We are going to make an imaginary engine using water. We are going to heat 100 grams of water to 120 C from its initial temperat

Svetach [21]

Answer:

The work done by this engine is 800 cal

Explanation:

Given:

100 g of water

120°C final temperature

22°C initial temperature

30°C is the temperature of condensed steam

Cw = specific heat of water = 1 cal/g °C

Cg = specific heat of steam = 0.48 cal/g °C

Lw = latent heat of vaporization = 540 cal/g

Question: How much work can be done using this engine, W = ?

First, you need to calculate the heat that it is necessary to change water to steam:

$Q_{1} =m_{w} C_{w} (100-22)+m_{w}L_{w}+m_{w}C_{g}(120-100)$

Here, mw is the mass of water

$Q_{1} =(100*1*78)+(100*540)+(100*0.48*20)=62760cal$

Now, you need to calculate the heat released by the steam:

$Q_{2} =m_{w}C_{g}(120-100)+m_{w}L_{w}+m_{w}C_{w}(100-30)=(100*0.48*20)+(100*540)+(100*1*70)=61960cal$

The work done by this engine is the difference between both heats:

$W=Q_{1}-Q_{2}=62760-61960=800cal$

8 0

3 years ago

Where is visible light found on the electromagnetic spectrum?

vampirchik [111]

Answer:

C: in between infrared and ultraviolet light

Explanation:

the colors are

V - violet

I - indigo

B - blue

G - green

Y - yellow

O - orange

R - red

5 0

3 years ago