2nd 9 weeks Blog#5

Solar (energy derived from the sun) panels make sense as a primary means of obtaining usable energy when the 2nd law of thermodynamics ( Heat spontaneously flows from a substance of higher temperature to a substance of lower temperature and never spontaneously in the reverse direction & Any reaction is never 100% efficient, some energy is always lost as heat) is taken into consideration, because they are a renewable source of energy ( a source that is not going to be depleted). The solar panels will always take in energy from the sun during the day and are effective with energy saving.

1. Which type of energy can be converted with this device?
 
A. Oil
B. Nuclear
C. Solar*

2. When at the top of a roller coaster not moving which of the following would be the greatest?
A. Speed
B. Kinetic Energy
C. Potential Energy*

3. When an object is at equilibrium it is?
A. Accelerating
B. Slowing down
C. Being still/ Moving at a constant speed*

2nd 9 weeks blog #4

When you are riding on a roller coaster there are several instances were energy ( the capacity of a physical system to perform work) transformations occur. To begin with you start out on the ground, not moving with any potential energy ( the amount of energy potentially available due to gravity) and no kinetic energy ( the type of energy used when something is in motion). Then you are moving up slowly with low kinetic and growing potential. At the top potential energy is the greatest and kinetic is close to zero. On the way back down the potential energy continuously decreases while kinetic grows.
1. Potential energy is directly related to
     A. Speed
     B. Temperature
     C. Gravity/Height*
2 Potential energy transforms into kinetic energy when
     A. Mass Changes
     B. Temperature changes
     C. Speed/Motion changes*
3 A 5kg ball moving at 6m/s has a kenetic energy of _____
   A. 87
   B. 67
   C. 90j*

Energy

Nuclear Power, is the splitting of atoms creating a reaction which is used to heat water and create steam, I feel it is a useful energy source.
Hydrogen Fuel, fuel that is dependent upon hydrogen cells alone, it seems to be a green and efficient power.
Coal, a fossil fuel that is burned to release it's energy, dirty but effective.
Oil, a fossil fuel that runs the world, its energy is released by burning it, is bad for the environment and wasteful.
Living Green, is the practice of reducing your carbon footprint on the world.
Energy efficiency, is using every bit of energy to the fullest extent.
 1.What type of energy is produced here?

A. Nuclear*

B. Solar

C. Geothermal

2. What Unit is Energy Meaured in?

A. m/s^2

B. s

C. j *

3. A man pushes a 16000 car 22 m, what is his work?

A. 22j

B. 545 j

C. 352000 j



Week # 2

On a roller coaster the ascent is the time when you feel the heaviest, the Fa (applied force) is greater than Fg ( force of gravity) and are working against each other. On the way down from a very tall height while going at a tremendous speed ( the amount of distance over a period of time) the Fa is greater than gravity ( the force which the earth pulls on objects) and they are both going in the same direction. NLUG (Newton's Law of Universal Gravitation) devises that gravity is 6.67x10^-11 but if an applied force is greater than this in the same directions objects can become weightless.

1. If the pilot were to disengage from the circle he would continue in a path ______ to the circle ?

A. Tangent *

                                              B. Perpendicular

                                              C. continuous circle

2. How can NLUG be used?

                                             A. To find Universal Gravitation

                                             B. To find the speed at which the earth travels

                                             C. All of the above *

3.  How fast does the earth move ?

                                              A. 107471992.32 m/s *

                                              B. 100 m/s

                                              C. 9653 m/s

Blog #1

A punt is about to ocurr in a football game
The ball is on the ground:

The center long snaps the ball

 

The punter kicks the ball and it comes back down

1.This picture examples what?

A. An object moving to the right

B. An object moving upward

 C. An object suspended in the air*

2. This is an example of what?

A. A ball goin straight up.

B. A rock being dropped straight down

C. a car driving down the road.*

3. Which direction is the object moving?

A. To the left

B. To the right

C. The object is not moving*

Week #7

The problems that I'm having the most problems with are the ones were i canot decide which way it needs to be solved for example, "During a baseball game, a batter hits a pop-up to a fielder 68 m away.The acceleration of gravity is 9.8 m/s2 .If the ball remains in the air for 5.1 s, howhigh does it rise?Answer in units of m."  I do not know whether to use the range formula to solve for Vertical Displacement ( the vertical distance traveled) or if I need to find another given that I am not seein such as the max angle (45 degrees) (The measure of a plane between to lines ) I need to come in before school to talk to my teacher. I should have a study group with friends and read the textbook more by myself.
  1)When does a football, if thrown straight up into the air have an acceleration of 0?                            
                                A:) At the top                                  B:) Never  *
                                C:) As it moves upward                   D:) As it moves down
 2) If a vehicle is at rest and has a top speed of 265 mph but is unable to accelerate, what speed can you get it up to?
                                A:) 183 mph                                    B:) 0 *
                                C:)265 mph                                     D:) 5mph
3)    This picture is an example of ?
      a) Mass
      b) Velocity
      c) an Angle *
      d) Displacement

Week #6

In basketball projectile motion is the name of the game, in fact it is the primary objective to get the basketball to fly through the air and into the basketball hoop. Mass (how much matter and object takes up)  must be taken into account while shooting a basket because you must know how much something weighs in order to put the corrct ammount of velocity (the distance an object moves over a period of time) on it so the ball will not fall short of the hoop. But even with knowing the mass and velocity, the athlete must also take into account the angle ( the space between two diverging lines or plan) that is needed for the ball to be shot from to allow elequent enry into the hoop from above while avoiding the rim.
1:  55 m/s is an example of ?
     a) Mass
     b) Velocity*
     c) Angle
     d) Gravity
2:   This picture is an example of ?
      a) Mass
      b) Velocity
      c) an Angle *
      d) Displacement
3: This device is used to measure ?
      a) Mass*
      b) Velocity
      c) Angles
      d) Distance