Explanation for question i & ii. Thank you.

A metal detector used in airports is actually a large coil of wire carrying a small current. Explain how it detects a gun, even

Alexus [3.1K]

Metal detectors work by transmitting an electromagnetic field from the search coil into the ground. Any metal objects (targets) within the electromagnetic field will become energised and retransmit an electromagnetic field of their own. The detector’s search coil receives the retransmitted field and alerts the user by producing a target response. metal detectors are capable of discriminating between different target types and can be set to ignore unwanted targets.

1. Search Coil

The detector’s search coil transmits the electromagnetic field into the ground and receives the return electromagnetic field from a target.

2. Transmit Electromagnetic Field (visual representation only - blue)

The transmit electromagnetic field energises targets to enable them to be detected.

3. Target

A target is any metal object that can be detected by a metal detector. In this example, the detected target is treasure, which is a good (accepted) target.

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8 0

2 years ago

One way to monitor global warming is to measure the average temperature of the ocean. Researchers are doing this by measuring th

Marat540 [252]

Answer:

0.07°C

Explanation:

solution:

the speed of a sound in water is:

v(T)=1480+4(T-4°C)

at 4°C the travel time is:

t(4◦C) = ( 7600 × 103 m ) / (1480 m/s) = 5202.7 s

5°C, the travel time is:

t(5◦C) = ( 7600 × 103 m ) / (1484 m/s) = 5188.7 s

one degree C corresponds to a ∆t of 14 s so temperature difference is:

ΔT=1 s/14 s=0.07◦C

5 0

3 years ago

Review 1: A plane is located x = 40 miles (horizontally) away from an airport at an altitude of h miles. Radar at the airport de

-Dominant- [34]

Explanation:

Let h is the height of the plane above ground. x is the horizontal distance between the ground and the airport. Let s(t) is the distance between the plane and the airport. So,

$s(t)^2={h^2+x^2}$ ...........(1)