# You are 15.0m from the source of a sound. At that distance, you hear it at a sound level of 20.0dB. How close must you move to the sound to increase the sound level to 60dB? I think its 45.0cm? 15.0cm 45.0cm 55.0cm 60.0cm 85.0cm

Explanation:

its 85 cm because it just is in meters it would be .8m  which would be decent distance to hear it

## Related Questions

How much excess charge must be placed on a copper sphere 25.0 cm in diameter so that the potential of its center, relative to infinity, is 1.50 kV?

Explanation:

Given data

Electric potential V=1.50 kV

Diameter d=25.0 cm

to find

We are asked to find excess charge

Solution

As inside the sphere the electric field is zero everywhere and potential is same at every point inside the sphere and on its surface

So we can use the value of the potential to get the charge q on the sphere

The temperature of the filament in a lightbulb is about 1900∘C∘C. What is this on the Fahrenheit scale? Express your answer using two significant figures.

Using two significant figures the temperature is Fahrenheit

Explanation:

Fahrenheit and Celsius are different scales of temperature. The conversion between Fahrenheit and Celsius is:

So, for 1900 Celsius degree

A carbon atom can form four covalent bonds. how many valence electrons does a carbon atom have

A carbon atom has 4 valence electron:)

True or False? Anything that moves up and down or back and forth in a rhythmic way is vibrating.

True, for example, sound waves are known for vibrating and they move up and down in a particular pattern depending on the pitch and volume. :) Hope this helps x

Remove the positive charge by dragging it back to the box at the bottom, and drag a negative charge (blue) toward the middle of the screen. Determine how the electric field is different from that of the positive charge.
What statement best describes the differences in the electric field due to a negative charge as compared to a positive charge?

the Voltages become negative instead of positive but the magnitude remains the same.

Explanation:

If we remove  the positive charge by dragging it back to the box at the bottom, and drag a negative charge (blue) toward the middle of the screen, the Voltages become negative instead of positive but the magnitude remains the same.

In a lab, you perform a double slit experiment to measure the wavelength of a particular laser. When aimed at two slits spaced by ﻿﻿﻿﻿﻿0.22 mm0.22mm﻿﻿﻿﻿﻿ an interference pattern is formed on a screen 0.5 m away. You measure that 10 bright lines of the interference pattern cover a total of ﻿﻿﻿﻿﻿1.3 cm1.3cm﻿﻿﻿﻿﻿ width on the screen. What is the wavelength of the laser light?

The wavelength of the laser light is 572 nm.

Explanation:

Given that,

Distance between slit d= 0.22 mm

Distance of screen D= 0.5 m

Bright lines = 10

Width y= 1.3 cm

We need to calculate the wavelength

Using formula of young

Put the value into the formula

Hence, The wavelength of the laser light is 572 nm.

Which use combustion to release thermal energy? furnaces and heat engines :this is the ANSWER

heat engines and heat pumps

heat pumps and bimetallic coils

bimetallic coils and furnaces

The correct option stating the devices that use combustion to release thermal energy is option {A} - furnaces and heat engines.

What is thermal energy?
• Thermal energy or kinetic energy is the energy due to the movement of atoms and molecules inside the different states of matter i.e., solids, liquids and gases.
• The molecules can move randomely inside a gas.
• While this free motion is restricted in case of liquid and is even more difficult in the case of solids.

Given are the devices that use combustion to release thermal energy.

• Combustion in easy terms mean to burn something and generate heat energy and utilize it to do some work.
• Furnaces heat air and distribute the heated air through the house using ducts.
• In thermodynamics and engineering, a heat engine is a system that converts heat to usable energy.

Therefore, the correct option stating the devices that use combustion to release thermal energy is option {A} - furnaces and heat engines.

To solve more questions on heat energy, visit the link below -

brainly.com/question/25384702

#SPJ6

Heat of combustion. The calorific value is the total energy released as heat when a substance undergoes complete combustion with oxygen under standard conditions. The chemical reaction is typically a hydrocarbon or other organic molecule reacting with oxygen to form carbon dioxide and water and release heat.

When you drive through deep water, you should dry out your brakes by _____________. pumping your brakes and driving in low gear driving normally speed up to get the air flowing

By Applying pressure to the brakes

Explanation:

Driving cars through deep water that is more than 10cm can make the cars to float. Most modern cars are usually water- tight so they can start to float through water that is about 30cm deep, fast moving water is very powerful so one needs to be very careful when driving.

If the brakes are wet test them by pressing or tapping on them gently.

You can as well dry brakes by driving in low gear and applying pressure to the brakes.

What is the resistance in a circuit that carries a 0.75 A current when powered by a 1.5 V battery?

Answer : The resistance in the circuit is, 2 ohm

Solution : Given,

Voltage = 1.5 V

Current in the circuit = 0.75 A

According to the Ohm's law, the current passing through the conductor is directly proportional to the voltage and is inversely proportional to the resistance.

Formula used :

where,

V = voltage

I = electric current

R = resistance

Now put all the given values in the above formula, we get

Therefore, the resistance in the circuit is, 2 ohm

The formula to use is: I = ( ΔV / R )
Once you solve for R, your new formula would be: R= ( ΔV / I )
Plug in your values to get: R = (1.5V / .75A )
Finally, R = 2Ω