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

week 5 post

The car that is most likely to explode on impact is car be. Even though car A has equal velocity (distance over time) to begin with, once the car goes over the edge it begins to positively accelerate (change in distance over time) and push its velocity over car A's and car B's. Also, falling off the cliff increases the chance of landing on something that would puncture the fuel tank.
 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) If a vehicle is accelerating at 2 meters per second while already going 10 meters per second how long will it take to get up to 20 meters per second?
                                A:) 5 seconds   *                               B:) 0
                                C:) 10 seconds                                D:) 2 seconds
                                                                                                                   

4th blog assignment

When a plane is in the air on cruise control it can be traveling with a velocity ( how quickly an object is changing displacement over a period of time) of close to 400 mph. While at the same time have an acceleration (the rate at which velocity changes) of 0 m/s^2. This is possible because though the plane is continuously moving, the velocity and direction are staying the same.

       1) Which of the following situations show a person having no acceleration?
             A) A skier going down a slope
             B) A car hitting its brakes
             C) A man sleeping on the couch. *
       2) When do you not have acceleration?
             A) When you are moving at a  constant speed? *
             B) When you are slowing down?
             C) When you are changing direction?
       3) What is the acceleration of this vehicle?
                        
               A) 50mps^2
               B) 0 mps^2  *                 
               C) 500 mph

3rd post

In a marathon velocity is more important than acceleration because it is more about speed over time. Acceleration is the force behind which something is moving either faster or slower where as velocity is just speed calculated by displacement.

1. What is acceleration? The force behind motion.
2. What is the difference between the acceleration sign and the speed sign? The squared symbol.
3. Is acceleration a scale or vector? Vector.

When a problem has a zero in it do we just act like it isn't there?
Are these due before Friday?
Do we need to square acceleration in the problems?

2nd Blog Post

When you are driving in a car there has to be acceleration because if there was no acceleration than the car would either never start moving or never stop moving. Also there would be no change in speed such as slowing down or speeding up, as well as there could be no change in direction like we do when we turn the steering wheel.

1.  If a time Vs. distance graph is curved is there acceleration? - Yes
2. What is the symbol for acceleration? m/s2 (meters per second squared)
3. If there is no change in speed, velocity or direction, is there acceleration? No

When finding the acceleration which variables should we look for first?
I am having problems putting the variables into the equations.

First Post Assignment

1. The directions for creating the blog were very good. Specifying whether or not we had to name our URL something specific, may have been helpful.
2. This first week has gone by very slow time seems to have been a year instead of a week.This morning I was going 60 miles an hour on the way to school. My total displacement for the day is only about two yards right now. But my total distance is much more.
3. Was I supposed to write the test questions on this blog? Is it necessary to use the same conversion technique as you do while solving a problem?
4. Q: If a car is traveling at an average speed of 60 MPH for 5 hours what is the total distance the car has traveled?  A:300 miles
5. Q: If Joe walks  100 meters to get coffee, then turns around and walks 30 meters back to where he came from, what is his total displacement?  A: 70 meters
6. Q: If a train has traveled 50 kilometers in 30 minutes what is its average speed?  A: 27.7 meters a second