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A) A ladder 25 feet long is leaning against a wall. If the foot of the...

A) A ladder 25 feet long is leaning against a wall. If the foot of the ladder is pulled away from the wall at the rate of 2 feet per second, how fast will the top of the ladder be dropping when the base is 7 feet from the wall?

B) A radar antenna, making one revolution every 3 seconds (one revoluton is 2π radian), is located on a ship that is 5 km from a straight shoreline. How fast is the radar beam moving along the line when the beam makes an angle of 45 degrees with the shore?

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