You can start with a recycling project , it can solve any problems including saving animals, giving clean water, and cleaner environment ofcourse
Answer:
<u>unless an external unbalanced force acts on it.</u>
Answer:
Amplitude and Frequency
Explanation:
Analog signals are composed of continuous waves that can have any values for frequency and amplitude. These waves are smooth and curved.
Radio transmissions are a combination of two kinds of waves: audio frequency waves that represent the sounds being transmitted and radio frequency waves that "carry" the audio information. All waves have a wavelength, an amplitude and a frequency as shown in the figure. These properties of the wave allow it to be modified to carry sound information.
The two most common types of modulation used in radio are amplitude modulation (AM) and frequency modulation (FM). Frequency modulation minimizes noise and provides greater fidelity than amplitude modulation, which is the older method of broadcasting . Both AM and FM are analog transmission systems, that is, they process sounds into continuously varying patterns of electrical signals which resemble sound waves.
Here the right answer
The motor is connected to a battery. When the switch is closed, the current starts<span> to flow and the coil becomes an electromagnet. In this case the current is flowing </span>anticlockwise<span> in the top of the coil. This makes the top a </span>north<span> pole. This north pole is </span><span>attracted </span><span>to the south pole on the left. So the top of the coil </span>turns<span> towards the left. Notice that the bottom of the coil is a </span>south<span> pole and is attracted to the magnet on the right. Hope this helped</span>
Heat lost or gained, H = mc(θ₂ - θ₁)
Where m = mass, c = Specific heat capacity, θ₂= final temperature, θ₁ = initial temperature
m = 200g, c = 0.444 J/g°C, θ₁ = 22 °C (Since it was cooled).
H = 6.9 kj = 6.9 *1000J = 6900 J
6900 = 200*0.444* (θ₂ - 22)
6900/(200*0.444) = θ₂ - 22
77.70 = θ₂ - 22
θ₂ - 22 = 77.7
θ₂ = 77.7 + 22 = 99.7
So initial temperature before cooling ≈ 100°C . Option C.