Відео

This was an ACT / SAT problem requiring some geometry to solve for the angle. First step is to solve for the area of the circle then go from there. The triangle cuts into the circle. The area of the circle outside of the triangle is given as 110pi. One length of the triangle is given as 22cm. Which thus the circle radius is 11cm.

This video goes over how to find the max speed of a car on a banked turn. It involves centripetal force.

An ACT / SAT geometry problem asking to find the exact belt length along two pulleys. This tricky problem is easier when broken down. I go through how to solve this problem.

This is the famous missing dollar riddle. I go over how to solve the riddle and show how it misguides you.

This is a Kinematics problem that requires solving for an acceleration during the time at which a force is applied to a ball by hand. When doing sum of forces, you can solve for the force given the acceleration you solved for in the Kinematics equations.

This goes over two blocks connected by a rope over a frictionless pulley. It shows how to find mass so that the block on incline slope won’t slip. Free body diagrams are key to solving.

This goes over how many trips it takes 2 boys and their father to cross a river. The boys each weigh 100lbs and the father weighs 200lbs and the boat weight limit is 200lbs.

This is a kinematics problem which solves how high a ball is thrown. Gravity is acting against the ball. The velocity at the peak is going to be 0 before falling back down. The time up equals the time down due to conservation of energy.

This video explains how to find an annual value (annuity) given both a present value and a future value. It uses compound interest formulas as well as the compound interest tables. This is an example from a PE Exam practice test for the Engineering Economics section.

This is a sum of forces problem that requires a free body diagram to determine the tension in the rope. This problem is from a JEE Main practice test.

This video quickly goes over an example problem of a pendulum. It uses energy conservation to determine the velocity of a pendulum at its lowest point. The ball starts from rest at maximum potential energy and reaches a max speed at the maximum kinetic energy.

This video goes over Blodgett’s line method to find minimum weld thickness. It is in his book “Design of Welded Structures.” This example has a torque on the member which makes the weld experience twisting.

This video goes over how to solve a u-tube manometer problem. It goes over balancing pressure due to column of liquid and gas pressure. Pressure due to column of liquid is density x gravity x height. This is a mechanical PE exam problem example for the Thermal and Fluids Systems section.

Simple Way to Determine Weld Thickness | Treat Weld As a Line

What is The Spring Force Acting on The Block? | Static Friction on an Inclined Slope

How Many Rotations Will Coin A Make as it Rolls Around Coin B? | The Coin Rotation Paradox

How to Find Maximum Bending Stress | Cantilever Beam

How to Find Minimum Pipe Wall Thickness | Hoop Stress | Example per B31.3