Answer:
1.12 N
Explanation:
Let the masses be m and M and distance be d . Force between them is .28 N .
Applying Newton's law of Gravitation
.28 = G x m M / d²
distance is halved , so distance becomes d /2
Force of attraction = G m M / ( d/2)²
= 4 Gm M / d²
= 4 x .28
= 1.12 N .
All metal atoms have mobile electrons, making them good conductors of heat. Heat is transferred as the free electons at the end that's being heated, rapidly move from atom to atom in the metallic bonds. This rapid movement of electrons allows for the transfer of heat energy from one end of the rod to the other.
Answer:
100 Joule
Explanation:
Amount of heat in agiven body is given by Q = m•C•ΔT
where m is the mass of the body
c is the specific heat capacity of body. It is the amount of heat stored in 1 unit weight of body which raises raises the temperature of body by 1 unit of temperature.
ΔT is the change in the temperature of body
___________________________________________
coming back to problem
m = 5g
C = 2J/gC
since, it is given that temperature of body increases by 10 degrees, thus
ΔT = 10 degrees
Using the formula for heat as given
Q = m•C•ΔT
Q = 5* 2 * 10 Joule= 100 Joule
Thus, 100 joule heat must be added to a 5g substance with a specific heat of 2 J/gC to raise its temperature go up by 10 degrees.
Radio waves have a low frequency and a long wavelength. (A. low; long)
Explanation:
Electromagnetic waves are periodic oscillations of the the electric and the magnetic field in a plane perpendicular to the direction of motion the wave.
All electromagnetic waves travel in a vacuum at the same speed, which is known as the speed of light:
Electromagnetic waves are also divided into 7 different types, according to their wavelength and frequency. From shortest to longest wavelength (and therefore, from highest to lowest frequency), we have:
Gamma rays
X rays
Ultraviolet
Visible light
Infrared radiation
Microwaves
Radio waves
As we can see from the list, radio waves are the waves with lowest frequency and longest wavelength. They are used in telecommunications, satellite communications, and in general in long-distance transmission of signals. So, the correct answer is
Radio waves have a low frequency and a long wavelength.
Learn more about electromagnetic waves:
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