Match the letters below with the correct choice on the right. Selections on the right may be used once, more than once, or not at all. Write the two Principles of Thermodynamics. Give an example with efficiency connection. 1. ___A___ cannot be created or destroyed, but it can be converted from one form to another. In terms of efficiency this law can be expressed as ___B___. 2. It is impossible to take ___C___ from a source and change all of it to mechanical energy or work; some heat must be wasted. In terms of efficiency this law can be expressed as ___D___.

An annular eclipse of the sun occurs when the

Match the letters below with the correct choice on the right. Selections on the right may be used once, more than once, or not at all. A soccer ball is dropped in a vacuum chamber. Describe the motion and show how the energy is transforming from a form to the other. Total energy is the sum of kinetic and ___A___ energy. Kinetic energy is the energy of a moving object and it depends on the object’s mass and its ___B___. Potential energy is the energy of position and the gravitational potential energy depends on the ___C___ above its original position. Because the motion of the ball takes place in a vacuum chamber the total energy is ___D___ (no friction). The total energy transforms from one form to the other. When the ball is released from the top of the chamber at rest all its energy is ___E___. As the ball falls, height decreases and the speed increases. At the end of the chamber (just before hitting the bottom) all its energy is ___F___.

A 1200-kg car goes from 10 m/s to 24 m/s in 16 s. The car’s acceleration is ___A___. The force acting upon the car is ___B___. The car’s initial momentum is ___C___.

A certain quantity of oxygen occupies a volume of 1.5 m3 at 10 ºC and ordinary atmospheric pressure (105 N/m2). If the pressure is doubled, but the volume is held constant, the new temperature is ___A___.   For the same initial quantity of oxygen that occupies a volume of 1.5 m3 at 10 ºC and ordinary atmospheric pressure (105 N/m2). If the temperature is decreasing to 5 ºC, but the pressure is constant, the volume will be ___B___.   Hint: When using the Ideal Gas Law temperature must be converted to Kelvin.

Match the letters below with the correct choice on the right. Selections on the right may be used once, more than once, or not at all. The reluctance of an object to change its state of rest or of uniform motion in a straight line is called inertia. ___A___ is the property of matter that shows itself as inertia. Mass is a ___B___ quantity and the SI unit for mass is ___C___. The weight of an object is the gravitational force between the object and the ___D___. Weight is calculated as the product between the object’s mass and the ___E___. Weight is a ___F___ quantity and the SI unit for weight is ___G___.

Convert to SI units. 1.2 miles/minute =

The law of gravity

The light-year is a an astronomical unit for:

A boy in a roller coaster with mass of 60 Kg is moving with 20 m/s, describing a circular arc with the radius of 30 m. What is the centripetal force acting on the boy?