Question

An early submersible craft for deep-sea exploration was raised and lowered by a cable from a ship. when the craft was stationary, the tension in the cable was 7000 n. when the craft was lowered or raised at a steady rate, the motion through the water added an 1800 n drag force.

Answer 1

Given that An early submersible craft for deep-sea exploration was raised and lowered by a cable from a ship. when the craft was stationary, the tension in the cable was 7000 n. when the craft was lowered or raised at a steady rate, the motion through the water added an 1800 n drag force.

The tension in the cable when the craft was being lowered to the seafloor

=Difference of the two forces = 7000-1800 =5200 N.  

The tension in the cable when the craft was being raised from the seafloor?

Sum of the two forces = 7000+1800 =8800 N.  

Answer 2

A. The tension in the cable when the craft was being lowered to the seafloor was 5200 N

B. The tension in the cable when the craft was being raised from the seafloor was 8800 N

Further explanation

Newton's second law of motion states that the resultant force applied to an object is directly proportional to the mass and acceleration of the object.

$\large {\boxed {F = ma }$

F = Force ( Newton )

m = Object's Mass ( kg )

a = Acceleration ( m )

Let us now tackle the problem !

When the craft was stationary, the tension in the cable was 7000 N.

$\Sigma F = 0$

$T - W = 0$

$7000 - W = 0$

$W = 7000 ~ N$

When the craft was lowered at a steady rate, the motion through the water added an 1800 N drag force upward.

$\Sigma F = 0$

$T - W + D = 0$

$T - 7000 + 1800 = 0$

$T = 7000 - 1800$

$T = 5200 ~ N$

When the craft was raised at a steady rate, the motion through the water added an 1800 N drag force downward.

$\Sigma F = 0$

$T - W - D = 0$

$T - 7000 - 1800 = 0$

$T = 7000 + 1800$

$T = 8800 ~ N$

Learn more

• Impacts of Gravity : https://brainly.com/question/5330244
• Effect of Earth’s Gravity on Objects : https://brainly.com/question/8844454
• The Acceleration Due To Gravity : https://brainly.com/question/4189441
• Newton's Law of Motion: https://brainly.com/question/10431582
• Example of Newton's Law: https://brainly.com/question/498822

Answer details

Grade: High School

Subject: Physics

Chapter: Dynamics

Keywords: Gravity , Unit , Magnitude , Attraction , Distance , Mass , Newton , Law , Gravitational , Constant