Answer:
A+B+C=7j+k
Explanation:
A=3i+4j
B=2i-2j+4k
C=i+5j-3k
A=3i+4j
+
B=<u>2</u><u>i</u><u>-</u><u>2</u><u>j</u><u>+</u><u>4</u><u>k</u>
i+2j+4k
A+B=i+2j+4k
+
C=<u>-i+</u><u>5</u><u>j</u><u>-</u><u>3</u><u>k</u>
7j+k
A+B+C=7j+k
An electromagnet is a soft metal core which is made into a magnet by passing the electric current through a coil which is surrounding it.
Answer:
If a pitch vibrates at 880 cycles, the octave below would vibrate at 440 cycles.
Explanation:
Pitch of sound is defined as relative highest and the lowest point of sound. The pitch is dependent on frequency of vibration.
Octave is defined as a tone which is formed due to merging of two different tone. The resultant tone is merged so well that it sound like a single tone.
Thus, Number cycle in octave = 
Number cycle in octave = 
Number cycle in octave = 440
Thus, If a pitch vibrates at 880 cycles, the octave below would vibrate at 440 cycles.