all sciences

Question 1

what is a wave

Answer 1

A rythmic disturbance that transfers energy through matter or space

Question 2

What are the two general types of waves

Answer 2

Mechanical and electromagnetic

Question 2

what are the types of mechanical waves

Answer 2

Transverse and longitidual

Question 3

what is a mechanical wave

Answer 3

a type of wave that requires matter to travel through

Question 4

what are examples of a medium

Answer 4

An earth quake or rope

Question 5

what is a transverse

Answer 5

A type of mechanical wave that move through mediums at right angles

Question 6

what is longitudual

Answer 6

a type of mechanical wave when vibration is parallel to the direct motion

Question 7

what is frequency and its symbol and its unit

Answer 7

The frequency of a wave is a measure of the number of oscilations of the wave per second symbol (f) unit hertzs

Question 8

what is periodic time

Answer 8

the periodic time of a wave (T) is the time taken forone complete cycle period = 1/f

Question 9

what is amplitude

Answer 9

maximum displacement from moon position for either side Measured in me

Question 10

what is wave length

Answer 10

the distance between two points on a wave train

Question 11

what is the formula for speed

Answer 11

speed = d/t

Question 12

what is the formula for displacement

Answer 12

d final - d initial

Question 13

what is the formula for velocity

Answer 13

displacement/time

Question 14

what is veloctity

Answer 14

The rate at which an object changes position

Question 15

what is stopping distance

Answer 15

the minimum distance required to stop a vehicle in an emergency

Question 16

what is the formula for distance

Answer 16

speed x time

Question 17

what is thinking distance

Answer 17

the amount of time it takes a driver to react and stop a vehicle

Question 18

what is the formula for thinking distance

Answer 18

speed x time

Question 19

what is the formula for stopping distance

Answer 19

thinking distance +breaking distance

Question 20

what is braking distance

Answer 20

depends on how fast a vehicle is travelling before the brakes are applied, and is proportional to the square of the initial speed#

Question 21

Newtons first law

Answer 21

In the first law, an object will not change its motion unless a force acts on it

Question 22

Newton second law

Answer 22

In the second law, the force on an object is equal to its mass times its acceleration

Question 23

newton 3rd law

Answer 23

n the third law, when two objects interact, they apply forces to each other of equal magnitude and opposite direction.

Question 24

What are carbohydrates and what is their importance

Answer 24

sugar molecules and they provide the body with glucose for energy production

Question 25

what are proteins and what is their importance

Answer 25

A molecule made up of amino acids. and they are used to repair body tissues

Question 26

what are li[ids and why are they important

Answer 26

Lipids are a class of organic compounds that are insoluble in water but soluble in organic solvents like alcohol and acetone.
maintain temperature and insulate the body

Question 27

How does one test for glucose (reducing sugar )

Answer 27

Using benedicts solution (brick red)

Question 28

How does one test for starch

Answer 28

Using Iodine (if positive blue black )

Question 29

How does on test for protein

Answer 29

Using buiret solution ( if positive the color will be purple)

Question 30

Test for lipids?

Answer 30

get a food sample and mix with ethanol (cloudy emulasion