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3 years ago

7

The reverse process of changing a liquid to a solid is called ............... or .................... . When a liquid change to

a gas on heating, this change of state is known as ..............

2 answers:

malfutka [58]3 years ago

4 0

Answer:

freezing

evaporation

Explanation:

Rama09 [41]3 years ago

3 0

Answer:

1- Melting

2- vaporization

Explanation:

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Monochromatic light with wavelength 590 nm passes through a single slit 2. 30 ?m wide and 1. 90 m from a screen. Find the distan

aivan3 [116]

Answer:

The fringes are 4.7*10^-7 m apart, such that they are adjacent.

Explanation:

Using the formula for adjacent fringes given a single slit:

Δ $x=\frac{(Wavelength)(Distance between slit and screen)}{Width}$

Δ $x=\frac{(590/10^{9})(1.90) }{(2.30)}$

Δ $x=0.000000487 m$

Hope this helps!

7 0

2 years ago

Read 2 more answers

An AC adapter for a telephone-answering unit uses a transformer to reduce the line voltage of 120 V (rms) to a voltage of 9.0 V.

Illusion [34]

Answer:

1. The number of turns on the secondary output is 18

2. The root mean square power delivered to the transformer is 48 Watts.

Explanation:

A transformer is an electronic device that can be used for increasing or decreasing the value of a given voltage. It consists of primary coils and secondary coil of a definte number of turns. When voltage flows in the primary coil, it induces voltage in the secondary coil. The two types are: step-up and step down transformers.

1. For a given transformer,

$\frac{V_{s} }{V_{p} }$ = $\frac{N_{s} }{N_{p} }$

where $V_{s}$ is the value of the induced voltage in the secondary coil, $V_{p}$ is he voltage in the primary coil, and $N_{s}$ is the number of turns of the secondary coil, $N_{p}$ is the number of turns in the primary coil.

From the question,

$V_{s}$ = 9.0 V, $V_{p}$ = 120 V, $N_{p}$ = 240, $N_{s}$ = ?

So that,

$N_{s}$ = $\frac{V_{s}*N_{p} }{V_{p} }$

= $\frac{9 * 240}{120}$

= 18

The number of turns on the secondary output is 18.

2. $Power_{rms}$ = $I_{rms}$ × $V_{rms}$

= 0.4 × 120

= 48 W

The rms power delivered to the transformer is 48 Watts.

8 0

3 years ago

Carl went on a Euro Trip and was traveling from Spain to Russia. When he looked on the map it said Russia was 7035 km away from

bija089 [108]

Answer:

The average speed would be 279.167 meters per second.

Explanation:

Speed is the magnitude that expresses the variation in position of an object and as a function of time. In other words, speed is defined as the relationship established between the distance traveled and the time elapsed in the movement of a mobile.

Speed can be calculated using the following expression:

$Speed=\frac{distance}{time}$

In this case:

distance= 7,035 km
time= 7 hours

Since the required unit of speed is meter per second, then you convert from km to meters for the case of distance, and from hours to seconds for the case of time. So:

distance= 7,035 km= 7,035,000 m (being 1 km= 1,000 m)
time= 7 hours= 420 minutes= 25,200 seconds (being 1 hour=60 minutes and 1 minute=60 seconds)

Replacing in the definition of speed:

$Speed=\frac{7,035,000 meters}{25,200 seconds}$

Solving:

$Speed=279.167\frac{meters}{ seconds}$

Then, <u><em>the average speed would be 279.167 meters per second.</em></u>

3 0

3 years ago

A dog exerts a force of 30N to move a wagon 2m in 5s. What is the power of the dog

Hunter-Best [27]

Explanation:

power=f×v. recall= distances/ time

= f× d/t

= 30 × 2/5

=12watt

6 0

3 years ago

a block of wood loses 160 j of gravitational potential energy as it slides down a ramp. if it has 90 J of kinetic energy at the

Nataly_w [17]

It would go slower there needs to be more gravity to go faster

3 0

4 years ago

Read 2 more answers