Answer:
Current, I = 0.54 A
Resistance, R = 201.6 ohms
Explanation:
Electric power is given in terms of current, I, and voltage, V, as:
P = I*V
I = P/V
The current flowing in the 60 W bulb will be:
I = 60/110 = 0.54 Amps
The resistance can be gotten by using an alternate formula for Power in terms of resistance:
P = V²/R
R = V²/P
R = 110²/60
R = 201.6 ohms
The 60W bulb has a current 0.54A flowing through it and a resistance of 201.6 ohms.
Amplitude of a sound wave
Answer: The frequency is inversely related to wavelength in electromagnetic wave.
Explanation:
Relationship between the frequency and wavelength of wave is given by the equation:
where,
= Frequency of the wave
c = speed of light =
= Wavelength of the wave
From the above relation, it is visible that frequency is inversely related to the wavelength of the wave.
Higher the frequency, low will be the wavelength of the wave and vice-versa.
Answer:
C) steel turning to rust in salt air
Explanation:
The missing options are:
A) ice melting to form liquid water
B) water boiling to form steam
C) steel turning to rust in salt air
D) sugar dissolving into hot coffee
In a chemical change the atoms of the reacting compounds are reordered forming new compounds. In a chemical change, new compounds appear, but in a physical change not.
Then, change of states like ice melting and water boiling are not chemical changes.
During steel rust, components of steel, like iron, are oxidized, that is, reacts with oxygen forming oxides.
The dissolution of sugar into hot coffee is a physical change in which sugar molecules get further apart in the coffee, but they don't change.
Work done equals force times distance
17x3=51Nm