Torque exerted by the sea on a submerged submarine's three escape hatches with different orientation.

Three emergency escape hatches are on a submarine submerged in sea water whose density is D=1025 kg/m^3. Each hatch is rectangular, having width W= .85 m, length L= 1.2 m with its hinge of length W along one side. SEE ATTACHMENT #1 for orientation for PARTS a, b, and c. PART a. The Deck Hatch is in a horizontal plane at depth H below the sea surface. Find the torque about an axis through the hinge, exerted on the hatch by the sea. PART b. The Aft Hatch is in a vertical plane with its hinge horizontal at the upper edge and distance S below the surface. Find the torque about the hinge axis, exerted by the sea on the hatch. PART c. The Forward Hatch is in a vertical plane with the hinge... click for more

Problem of friction

Can you help me for solving this problem below. Because I don't know how can I deal with this kind of problem of friction when there are a car. So, explain me how can I solve this problem step by step with a free body diagram ( for understanding your resolution)showing the forces working over the car and its wheels. Here is the asking problem: A car is stopped with its front wheels resting against a curb when its driver starts the engine and tries to drive over the curb. Knowing that the radius of the wheels is 280 mm, that the coefficient of static friction between the tires and the pavement is 0.90, and that 60 percent of the weight of the car is distributed over its front wheels and 4... click for more

Bernoulli's equation determines ejection velocity of liquid from a tank. Motion equations find x,y coordinates of impact of the liquid.

A large tank contains non-viscous liquid whose depth is H. A bullet punches a small hole of radius r in the vertical side of the tank at a point which is distance h below the liquid surface. SEE ATTACHMENT #1 for a diagram showing parameters and Bernoulli's equation. PART a. Apply Bernoulli's equation to determine distance h such that the emerging liquid impacts the ground at maximum distance from the base of the tank which is resting on the ground. Give the answer as h in terms of H. PART b. The same tank, containing the same liquid at depth H= 8 m, is now placed on a support so that its bottom surface is distance B= 15 m above the ground. The hole of radius r= .03 m is made at a po... click for more

A truck is to be driven upward on a plane. Find the maximum plane angles P for front wheel drive, Q for rear wheel drive, and S for all wheel drive.

A truck whose weight is W, has a wheelbase (distance between front and back wheels) B= 3.2 meters. On level ground the front wheels carry 65% of its weight. The center of gravity (c.g.) of the truck is distance d= .85 m above the ground and unknown horizontal distance x, behind the front wheels' contact with the ground. The coefficient of friction is f= .70 between tires and plane. SEE ATTACHMENT #1 for a diagram with parameters. PART a. Find the distance x, from the front wheel to the c.g. PART b. Find the maximum slope angle P, for which the truck with only front wheel drive can move up the plane. PART c. Find the maximum slope angle Q, for which the truck with only rear wheel drive ca... click for more

Express the angular momentum of a marble moving first past an axis then around an axis.

Definition 1: The linear momentum, vector p, of an object is its mass, m, times its velocity, vector v. Definition 2: The angular momentum, vector L, of an object about an axis, is defined as the cross product of the position, vector R, relative to the axis, and its linear momentum, vector p. Definition 3: The magnitude of the cross product is the product of the magnitudes of the vectors times the sine of the angle between their positive directions. The cross product is a vector perpendicular to both vectors. Problem: A marble of mass m moves with velocity v in the x,y plane at angle B relative to position vector R from origin to the mass. SEE ATTACHMENT #1 PART a for a diagram of... click for more