Answer:
0.12 kg
Explanation:
The amount of energy added is:
1000 W × (5 min × 60 s/min) = 300,000 J = 300 kJ
Heat to boil the water is:
q = mCΔT + mL
q = m (CΔT + L)
300 kJ = m (4.2 kJ/kg/K × (100°C − 30°C) + 2200 kJ/kg)
300 kJ = m (2494 kJ/kg)
m = 0.12 kg
First we calculate the Electric Force
F = qE = 1.6E-19 * 4 E+4 = 6.4 E -15 N
This Force is equal to mass*acceleration
F = m*a
Mass of the electron = 9.1 E-31 Kg
Mass of the proton = 1.67 E -27 Kg
Acceleration of electron = 6.4 E -15 / 9.1 E -31 = 7.033 E 15 [m/s**2]
Acceleration of proton = 6.4 E -15 / 1.67 E -27 = 3.832 E 12 [m/s**2]
Answer: 355.66 m/s
Explanation:
Since sound is a mechanical wave, its speed varies with the medium and its properties, such as its temperature.
So, if we want to calculate the speed of sound in air at we can use the following equation that relates with the temperature:
(1)
Where:
is the Heat capacity ratio for air
is the Universal Gas constant
is the air temperature in Kelvin
is the air molar mass
(2)
Finally:
This is the speed of sound at 313 K
Answer: B. Title 1 is “Transverse Waves,” and Title 2 is “Longitudinal Waves.”
Explanation:
In transverse waves, the particles of the medium oscillate up and down perpendicular to the direction of motion of wave. crests and troughs are formed. Examples of transverse wave: light wave, wave on a string.
An electromagnetic wave is a transverse wave. It can travel in both space as well as medium. It travels with the speed of light in space and slows down in medium.
In longitudinal wave, the particles of the medium oscillate to and fro parallel to the direction of the motion of wave. Example: sound wave
A sound wave is mechanical wave. It requires medium to travel. A sound wave is longitudinal wave. Sound wave travels forward by compression and rarefaction of the medium.
Thus, the title 1 should be transverse wave and title 2 should be longitudinal wave.
The answer is 175184.08 joules