If it takes you 10 seconds to move a chair 5 meters across the floor, using a force of 2 Newtons, how much power did you put out
1 answer:
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Answer:An electromagnet is a magnet that works with electricity. It can be switched on and off. The coils are nearly always made of copper wire because copper is such an excellent electrical conductor. Electromagnets have many uses.Permanent magnets are mainly used in small generators, and they have the advantage that they don't need a power supply. Electric magnets are iron or steel wound with wire. When electricity passes through the wire, the metal becomes magnetic and creates a magnetic field.
Explanation:
Answer:
1300 Hz
Explanation:
f' = Actual frequency = 4.8 MHz
f = Observed frequency
= Relative velocity of blood = 0.21 m/s
v = Velocity of ultrasound = 1540 m/s
From the Doppler effect formula we have
Frequency shift is given by
The frequency shift in the sound is 1300 Hz