separate science

Question 1

What is the word equation for kinetic energy?

Answer 1

kinetic energy = 0.5 × mass × speed2

Question 2

What is the word symbol for kinetic energy?

Answer 2

Ek = ½ m v2

Question 3

What is the word equation for gravitational potential energy?

Answer 3

gravitational potential energy = mass × gravitational field strength (g) × height

Question 4

What is the symbol equation for gravitational potential energy?

Answer 4

Ep = m g h

Question 5

What is the word equation for power energy?

Answer 5

power = energy transferred
time

Question 6

What is the symbol equation for power energy?

Answer 6

P = E
t

Question 7

What is the equation foe efficiency?

Answer 7

efficiency = useful output energy transfer
total input energy transfer

Question 8

What is a eukaryotic cell?

Answer 8

a cell with membrane bound organelles

Question 9

What is a prokaryotic cell?

Answer 9

there usually are a lot smaller. note that they sometimes have cell walls

Question 10

What is the equation for magnification?

Answer 10

Magnification = size of image/size of real object

Question 11

Define diffusion

Answer 11

Diffusion is the spreading out of particles of a substance from an area of higher concentration to an area of lower concentration.

Question 12

Name 3 things that effect the rate of diffusion

Answer 12

The rate of diffusion is increased by the difference in concentration, the temperature and the available surface area.

Question 13

what is osmosis?

Answer 13

Osmosis is a special case of diffusion. It is the movement of water from a dilute to a more concentrated solution through a partially permeable membrane.

Question 14

What is active transport?

Answer 14

• Moves substances from a more dilute solution to a more concentrated solution (against a concentration gradient). requires energy

Question 15

how is dna stored in prokaryotic cells?

Answer 15

• The genetic material in a prokaryotic cell is a loop of DNA
• Prokaryotes also have small extra loops of DNA called plasmids

Question 16

24 What is the unit of specific heat capacity?

Answer 16

J/kg °C

Question 17

What is the specific heat capacity of a substance?

Answer 17

It is the amount of energy required to raise the temperature of 1 kg of the substance by 1 °C

Question 18

How can the efficiency of an energy transfer be increased?

Answer 18

By using lubrication or insulation

Question 19

What is the mass number?

Answer 19

The sum of protons and neutrons in the nucleus

Question 20

What is the atomic number?

Answer 20

Number of protons in an atom

Question 21

are the number of protons= the number of electrons. true or false

Answer 21

true

Question 22

are the number of neutrons= the number of electrons. true or false

Answer 22

false

Question 23

What occurs during cytokinesis?

Answer 23

The cytoplasm and cell membranes divide.

Question 24

What is a potential use of stem cells in medicine?

Answer 24

To treat conditions where cells have been damaged e.g. diabetes, paralysis.