1.) A speedboat can travel across a lake (no current) with a speed of 120 km/h....

1.) A speedboat can travel across a lake (no current) with a speed of 120 km/h. How much time would it take this boat to travel 8.5 km upstream on the Spey River in Scotland, against a current with a speed of 16 m/s? A 4.3 minutes B 5.4 minutes C 6.5 minutes D 8.2 minutes E None of these.

2.) A radar antenna that measures 12 meters from tip to tip (see the figure below) rotates about its midpoint at a rate of 120 revolutions per minute. What is the tangential speed of either tip of the antenna?

A 12 m/s

B 75 m/s

C 150 m/s

D 4.5 x 10³ m/s

E None of these is correct

3.) To avoid injury, the pilot of a high-performance jet should never be subjected to a force greater than eight times her or his weight. If an F-35A jet is in a steep dive, traveling with a speed of 2.0 x 10² meters per second, what is the minimum radius of curvature r with which the pilot can safely pull out of the dive? (See the figure. Assume that the pilot is entirely supported by a contact force exerted by her or his seat.)

A 2.9 m

B 510 m

C 580 m

D 4100 m

E None of these is correct.

Solutions

Expert Solution

genius_generous answered 1 year ago

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