Physics and career

my problem is how can physics help us in careers such us biotechnologist,astronomist,geology,biotechnology,aerospace,industry and communications?

Buoyant Forces

A bathysphere used for deep sea exploration has a radius of 1.5m and a mass of 1.2*10^4kg. In order to dive, this submarine takes on mass in the form of sea water. Determine the mass the submarine must take on so that it can descend at a constant speed of 1.2m/s, when the resistive force on it is 1100N upward. The density of sea water is 1.03*10^3kg/m^3. I have the answer but don't know how they get it. 2670kg

Buoyant Forces: Finding the horizontal area enclosed by the waterline.

Suppose one of the navy ships bobs up to float 11cm higher in the water when 50 fighters take off from it in 25 minutes, at a location where g=9.78m/s^2. Bristling with bombs and missiles, the planes have average mass 29000kg. Find the horizontal area enclosed by the waterline of the 4 billion dollar ship. By comparison, its flight deck has area 18000m^2. Below the decks are passageways hundreds of meters long, so narrow that two large men cannot pass each other.

Physics Problems College Level 1 (Momentum and Collisions)

Show all steps (all questions): 1)Impulse and momentum change/varying force. A 10-kg asteroid is traveling through space at 2 m/s toward a spaceship. To avoid a collision, an astronaut, with the help of a backpack rocket, exerts a force of 20 N on the asteroid in the opposite direction for 5 s. (a) find the asteroid's final speed? (b) How long should she have pushed in order to just stop the asteroid? 2) Conservation of linear momentum. A toy cannon having a mass of 4.0 kg sits on a frictionless level surface. It fires a 250-g projectile horizontally and immediately recoils westward at 1.5 m/s. (a) Find the change in momentum of the cannon? (b) Determine the change in momentum of... click for more

Physics Problems College Level 1(work, energy, power)

Show all steps (for all problems) 1) Work. A pickup truck is hauling a barge along a canal at constant speed. The truck, driving parellel to the waterway, is attached to the barge by a cable tied to the bow making a 30 degree angle with the forward direction. If the truck exerts a froce of 1000 N on the cable, how much work is done in overcoming friction as the barge is moved 10 km? 2)A runner accelerates to a top speed of 9.9 m/s, taking a number of strides (N). If the average horizontal force exerted on the ground is 1.5 times body-weight, and if it acts during each stride over a length of 1/3 m, determine the value of N? 3) Potential Energy. A 60-kg person is slowly doing chin-ups... click for more