ANSWERS TO QUESTIONS FOR THE DAY

1. A car is traveling at the speed of 20 mph. How far will it travel in 5 hrs?
A. 4 mi
B. 100 mi  (distance = speed x time; 20 mph x 5 hrs= 100)
C. 20 mi
D. 25 mi

2. A car is traveling at the speed of 20 mph. How far will it travel in 30 minutes?
A. 600 mi
B. 50 mi
C. 10 mi (distance = speed x time; change 30 minutes to hours first, then 20 mph x 0.5 hrs= 100)
D. 15 mi

3. What is the distance traveled in 5 seconds by the car whose graph is shown below?

A. 10 m
B. 50 m (The distance is the area under the graph from 0-5 s, this is a triangle so Area=1/2 x 5 x 20 = 50)
C. 100 m
D. 20 m

Use the graph below to answer the following questions.



4. During which time interval is the object decelerating?
A. 12-16 s
B. 4-10 s
C. 0-2 s
D. 10-12 s

5. During which time interval is the object accelerating?
A. 12-16 s
B. 4-10 s
C. 0-2 s
D. 10-12 s

6. During which time interval is the object moving with a constant speed?
A. 2-10 s
B. 4-10 s
C. 0-2 s
D. 10-12 s

7. During which time interval did the object travel the greatest distance?
A. 2-10 s (The distance is the area under the graph. You can estimate this using the number of boxes)
B. 4-10 s
C. 0-2 s
D. 10-12 s

7. During which time interval did the object travel the shortest distance?
A. 2-10 s
B. 12-16 s
C. 0-2 s The distance is the area under the graph. You can estimate this using the number of boxes)
D. 10-12 s

8. An object travels a distance of 15 meters when an force of 4 N  act on it. What is the work done?
A. 30 J
B. 19 J
C. 60 J (Work = force x distance)

D. 11 J

QUESTIONS FOR THE DAY

1. A car is traveling at the speed of 20 mph. How far will it travel in 5 hrs?
A. 4 mi
B. 100 mi
C. 20 mi
D. 25 mi

2. A car is traveling at the speed of 20 mph. How far will it travel in 30 minutes?
A. 600 mi
B. 50 mi
C. 10 mi
D. 15 mi

3. What is the distance traveled in 5 seconds by the car whose graph is shown below?

A. 10 m
B. 50 m
C. 100 m
D. 20 m

Use the graph below to answer the following questions.



4. During which time interval is the object decelerating?
A. 12-16 s
B. 4-10 s
C. 0-2 s
D. 10-12 s

5. During which time interval is the object accelerating?
A. 12-16 s
B. 4-10 s
C. 0-2 s
D. 10-12 s

6. During which time interval is the object moving with a constant speed?
A. 2-10 s
B. 4-10 s
C. 0-2 s
D. 10-12 s

7. During which time interval did the object travel the greatest distance?
A. 2-10 s
B. 4-10 s
C. 0-2 s
D. 10-12 s

7. During which time interval did the object travel the shortest distance?
A. 2-10 s
B. 12-16 s
C. 0-2 s
D. 10-12 s

8. An object travels a distance of 15 meters when an force of 4 N  act on it. What is the work done?
A. 30 J
B. 19 J
C. 60 J
D. 11 J

IMPORTANT MOTION FORMULAS

There are some few motion formulas that you should know for the test.

1. Distance = speed x time 

2. Work = Force x distance

3. acceleration = change in velocity  =  Final velocity - Initial velocity  

                            change in time              Final time - Initial time

                            

Positive slope means the car is accelerating, that is the velocity is increasing with time. Zero slope means the velocity is constant (that is, not changing with time), and negative slope means the car is slowing down (that is, the velocity is decreasing with time)

Also, you must know the standard international (SI) units of the following:

1. Work -------------Joules (J)

2. Force ------------- Newtons (N)

3. Velocity ---------- meters per second (m/s)

4. Time ------------ seconds

MOVEMENT ACROSS THE CELL MEMBRANE

Today, we will discuss the various types of movements across the cell membrane. This is a very important topic that you should know very well for the test. Don't just memorize the definitions but know different applications of the concepts. It is important to know some of the examples of hand!

Movement of substances across the cell membrane

1. Diffusion or passive transport: It is the movement of materials from a region of higher to a region of lower substance concentration.                                                                                                                                                                                                                                         Examples: When a bottle of perfume is opened, the scent spreads throughout the room. A drop of ink placed in a cup of water spreads throughout the water by diffusion.                                                
2. Active transport: It is the movement of molecules from a region of lower concentration to a region of higher concentration in which energy is needed in the form of ATP. The movement of the substance is against a concentration gradient.                                                                                                                                                                                                                                                          Examples: Sodium is pumped out of the cell by active diffusion. Potassium is pumped into the cell by active diffusion.                                                                                                                                       
3. Osmosis: It is the flow of water molecules from a less concentrated solution (hypotonic solution) to a higher concentrated solution (hypertonic solution) through a semi-permeable membrane.                                                                                                                                                                Example: When a red blood cell is placed into water, the water flows across the cell membrane into the cell because of the dissolved salts in the cytoplasm.                                                              Water flows from the soil into the roots of plants by osmosis.                                                                   
4. Facilitated diffusion: As certain substances move into the cell by simple or passive diffusion, they create the opportunity for other substances to go into the cell freely.                                                                                                                                                                                              Example: Glucose follows sodium as it enters the cell by facilitated diffusion.                                               
5. Endocytosis: This is the process by which the cell engulfs or captures substances into the cytoplasm. It consist of pinocytosis (Cell-drinking) and phagocytosis (Cell-eating)                                                            
6. Exocytosis: This the process by which the cell extrudes or gets rid of substances  from within the cell to the outside.                                                                                                                                              

PHYSICS - LAWS OF MOTION

We will study some physics today. Horray! You need to know some basic physics for the test. We will consider some of the laws of motion and their applications.

NEWTOW'S LAWS OF MOTION

1. A body at rest will remain at rest or if it is in motion, it will continue to move unless an opposing force acts on it. This law explains why if you leave a book on a table, it will be there forever unless somebody moves it. It also explains why somebody is thrown out of a moving car or bus live a projectile when the vehicle comes to a sudden stop. You move at the same speed of the vehicle you continue to move with this speed until the windshield stops you (opposing force)

2. The force on an object is directly proportional to its acceleration and the mass. The acceleration is inversely proportional to the mass. In others words, as the acceleration and the mass increase, the force increases. As the mass increases, the acceleration decreases and vice versa.

Force = Mass x Acceleration 

3. Action and reaction forces are equal but in opposite directions. What does this mean? If you push a wall, you exert an act force on it. The wall pushes you back with the same force (reaction force) which is in the opposite direction. The same thing happens with you standing on the ground.

QUANTITIES

There are two types of quantities used in science.

1. Scalar quantity: This quantity has only magnitude. Example: mass, time, density, volume, distance, speed, etc. Only the magnitude or size matters! For example, traveling 2 miles is distance or traveling at the speed of 2 mph or 2 km/hr.

2. Vector quantity: This quantity has both magnitude and direction. For example, displacement, velocity, weight, force, etc. The direction has to be specified.  For example, traveling 2 miles north is displacement or traveling at the velocity of 2 mph or 2 km/hr west.

ATOMIC STRUCTURE

STRUCTURE OF THE ATOM AND ELECTRON CONFIGURATION 

MATH PRACTICE QUESTIONS

PRACTICE 1
1	When taking a patient’s pulse, one counts 23 beats in 15 seconds. How many times will the patient’s heart beat in 1 minute
2	76.2  x 1.04
3	Divide 3.45 by 0.15
4	Write 5/7 as a decimal
5	A recipe requires 2½ cups of nonfat milk. A person already has ¾ cup. How much more is needed?
6	Of the children coming into a clinic, 7.5% have a certain condition, For every 150 children that visit the clinic, how many are expected to have this condition?
7	A woman’s diet contains 75% of the recommended amount of iron. If the recommended amount is 18 mg, how much more iron does she need to meet this requirement?
8	The 6% sales tax on textbooks was $3.54. How much did the textbooks themselves cost?
9	If 30% of a certain number is 120, what is the number?
10	Solve the following system of equations 3x + 2y = 16 4x + 2y = 24
11	A 3-oz serving of corned beef hash supplies 153 calories. How many calories will be supplied in 5-oz serving?
12	You spent 1/5 of your salary for taxes, ¼ for rent, and 1/10 for movies. What fraction of your salary is left for other expenses and savings?
13	If 65% of a student body of 2000 students passed a mathematics examination, how many students did not pass?