Answer: Radio signals sent through space
Explanation:
>Radio signals are electromagnetic signals which can travel through space even in vacuum where no air is absent . Radio signals carry energy in the form of electromagnetic wave .
>Thunder heard from many miles away is due to propagation of sound wave in the air or atmosphere . The sound wave carries energy in the form of mechanical energy which can not propagate in vacuum and requires a medium .
>When nuclei of atoms split into parts they fly away from each other with some speed carrying kinetic energy which is a part of mechanical energy .
Thus mechanical energy is involved in all the given examples expect the case of radio signals sent through space.
Answer: True
Explanation: Metamorphism is the changing of rocks by heat and pressure. During this process, rocks change either physically and/or chemically. They change so much that they become an entirely new rock. Figure 4.22: The platy layers in this large outcrop of metamorphic rock show the effects of pressure on rocks during metamorphism.
Answer :
0.5 Ω
Explanation:
The following data were obtained from the question:
Voltage (V) = 7.2 V
Current (I) = 14.4 A
Resistance (R) =..?
The resistance of the motor can be obtained by applying the ohm's law equation as shown below:
V = IR
7.2 = 14.4 × R
Divide both side by 14.4
R = 7.2/14.4
R = 0.5 Ω
Therefore, the resistance is 0.5 Ω
Answer:
Explanation:
The fundamental mode of the standing wave in string is expressed as;
fo
F = V/2L where;
V is the speed of the transverse wave
L is the length of the string
Given
V = 40.0m/s
L = 2.00m
F = 40.0/2(2)
F = 40/4
F = 10Hertz
Hence the fundamental mode of the standing wave is 10Hz
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<em>Overtone/harmonics are integral multiples of the fundamental frequency.</em>
Note that 1st overtone is also called second harmonic
Second harmonic
First overtone F1 = 2F
Second overtone/Third harmonics = 3F
First overtone F1 = 2*10
First overtone = 20Hz
3rd harmonic = 3*10
3rd harmonic = 30Hz
Answer:
B. 39.8°
Explanation:
Since the adjacent and opposite sides are given, we use tan ratio for the triangle.
Using tan ratio for the given triangle, we get
Therefore, the correct option is option B.