science

Question 1

compare and contrast longitudinal and transverse waves.

Answer 1

transverse waves move the medium at right angles to the direction in which the waves move while longitudinal waves move parallel to the direction in which the waves move.

Question 2

list 3 renewable and non-renewable sources

Answer 2

*Solar energy
wind energy
hydropower energy
*Fossil fuel
coal
natural gas

Question 3

continental drift

Answer 3

The gradual movement of the continents across the earth’s surface through geological time.

Question 4

wavelength

Answer 4

distance from crest to crest to trough to trough.

Question 5

frequency

Answer 5

the number of complete waves that pass a certain point in a certain amount of time.

Question 6

what does an electric circuit need

Answer 6

• wires
  *source of electrical energy
• a component

Question 7

what is voltage

Answer 7

pressure from an electrical circuit’s power source that pushes charged electrons through a conducting loop.

Question 8

current meaning

Answer 8

flow of electrons through a complete circuit of conductors (it is used to power everything)

Question 9

resistance meaning

Answer 9

measure of opposition to current flow in an electrical circuit

Question 10

difference between series and parallel circuits

Answer 10

series is not common in homes while parallel are and series is unreliable wiring method while parallel is

Question 11

3 circuits

Answer 11

wire, light and globe

Question 12

3 conductors

Answer 12

silver gold and steel

Question 13

law of conservation of energy

Answer 13

when energy is transferred from place to place or transformed from one type of energy to another, the total amount of energy remains the same. Therefore, energy cannot be created or destroyed, but can only change places or forms

Question 14

what does efficiency allow us to do

Answer 14

compare how much waste energy and useful energy is produced

Question 15

how do you calculate efficiency

Answer 15

efficiency=useful energy/ total energy x 100 (always in a percentage)

Question 16

how does heat transfer occur

Answer 16

conduction, convection or radiation

Question 17

conduction meaning

Answer 17

only occurs between objects that are in direct contact

Question 18

convection meaning

Answer 18

the transfer of heat between 2 bodies by currents of moving gas or fluid.

Question 19

radiation meaning

Answer 19

a process where heat waves are emitted that may be absorbed, reflected or transmitted through a colder body

Question 20

light

Answer 20

can be transmitted, absorbed or reflected

Question 21

transparent

Answer 21

allows light to pass through without being transmitted.

Question 22

translucent

Answer 22

allows some light to pass through, rest of the light is reflected

Question 23

opaque

Answer 23

do not allow any light to pass through, it absorbs the light.

Question 24

refraction

Answer 24

bending of light as it travels into a medium with different density

Question 25

where do tectonic plates interact

Answer 25

due to convection currents in the mantle

Question 26

how do tectonic plates interact

Answer 26

1. move away from each other (divergent) 2. move towards each other (convergent) 3. slide past each other (transform)

Question 27

what is Pangea

Answer 27

Pangea also spelled Pangaea, in early geologic time, a supercontinent that incorporated almost all the landmasses on Earth.

Question 28

what is high frequency

Answer 28

when the waves are close to each other

Question 28

how does the magma keep moving

Answer 28

convection currents in the mantle keep the magma moving.

Question 29

what are waves

Answer 29

disturbances that transfer energy from place to place

Question 29

what do waves require

Answer 29

a medium to travel on or through

Question 30

do waves move matter

Answer 30

no waves move energy

Question 31

anatomy of a wave

Answer 31

amplitude- how high the wave is from the center crest- the top of the wave

Question 32

how do the movement of earths plate move

Answer 32

they move because of convection currents in the mantle

Question 33

what energy does a radio need

Answer 33

Electromagnetic energy travels in waves and spans a broad spectrum from very long radio waves to very short gamma rays

Question 34

how are tsunamis created and caused, what are the effects and how can it be minimized

Answer 34

A tsunami is a catastrophic ocean wave that is usually caused by a submarine earthquake, an underwater or coastal landslide, or the eruption of a volcano. Unusually strong currents and Rapid flooding of land. Dense mangrove habitats can be used to reduce the force of waves and reduce the pressure. Coral reefs may be artificially constructed.

Question 35

how are earthquakes created and caused, what are the effects and how can it be minimized

Answer 35

As plates move in different directions over long periods of time, the .friction causes energy to build up. It becomes so great that the energy is released, which creates a shock wave - an earthquake. Ground shaking Surface faulting and Ground failure. Seismic isolation Seismic energy dissipation systems