All categories

3 years ago

Which statement best explains why sound waves cannot travel through space

1 answer:

6 0

The vacuum of outer space has essentially zero air. Because sound is just vibrating air, space has no air to vibrate and therefore no sound. If you are sitting in a space ship and another space ship explodes, you would hear nothing. So, in order for sound to travel, there has to be something with molecules for it to travel through. On Earth, sound travels to your ears by vibrating air molecules. In deep space, the large empty areas between stars and planets, there are no molecules to vibrate. There is no sound there.

You might be interested in

Calculate the efficiency of a hair dryer which takes in 4500J of energy per second and transfers 150J as useful heat energy.

Basile [38]

Answer:

η = 0.0333 = 3.33 %

Explanation:

The efficiency of any device is defined as the ratio of the useful output obtained from that device to the input required by the device. Therefore, the general formula to find the efficiency of any device is given as follows:

$\eta = \frac{O}{I}$

where,

η = efficiency of hair dryer = ?

O = Useful Output Given by the Hair Dryer = 150 J

I = Input Energy Required by the Hair Dryer = 4500 J

Therefore,

$\eta = \frac{150\ J}{4500\ J}\\$

5 0

3 years ago

Air breaks down and conducts charge as a spark if the electric field magnitude exceeds V/m. Determine the maximum charge that ca

Ymorist [56]

Answer:

Explanation:

Suppose

Magnitude of Electric Field is E V/m

Area of the cross-section is A

capacitor $C=\frac{\epsilon A}{d}$

Distance between Area of capacitor is d

Maximum Charge stored is

$Q_{max}=capacitor\times Potential\ Difference$

$Potential\ Difference=electric\ Field\times distance=E\times d$

$Q_{max}=C\times Ed=CEd$

$Q_{max}=\frac{\epsilon _0A}{d}\times Ed$

$Q_{max}=\epsilon _0AE$

3 0

4 years ago

PLEASE HELP!!

IrinaK [193]

Answer:

Explanation

i think its a not 100% sure though.

7 0

3 years ago

A 30 kg box sits on the floor it requires 275N of force to get it moving once it is moving it only takes 225N of force.what are

gavmur [86]

1) The coefficient of static friction is 0.935

2) The coefficient of kinetic friction is 0.765

Explanation:

When a force is applied on a box sitting on the floor, the force that must be applied in order to make the box moving is equal to the maximum force of static friction between the floor and the box, which is:

$F = \mu_s mg$

where

$\mu_s$ is the coefficient of static friction

m is the mass of the box

g is the acceleration of gravity

Here we have:

m = 30 kg

$g=9.8 m/s^2$

F = 275 N

Therefore, the coefficient of static friction is

$\mu_s = \frac{F}{mg}=\frac{275}{(30)(9.8)}=0.935$

Once the box is in motion, the force that must be applied in order to make the box moving at constant velocity is equal to the force of kinetic friction between the floor and the box, which is:

$F = \mu_k mg$