Question 1

Density is the ratio of mass volme for a substance: $\rho=\frac{m}{v}$

Accepted Answer

true

Answer

false

Question 2

How can you calculate distance?

Question 3

With what unit do you measure weight and with what unit do tou measure mass? (acceleration due to gravity 9.8m/s $\rho=\frac{m}{v}$ )

Question 4

What is the formula for force?

Accepted Answer

F= ma

Question 5

Formula for the moment.

Accepted Answer

Force x distance from pivot

Answer

$\frac{Force}{dis an ce\ from\ pivot}$

Answer

$\frac{Force}{dis an ce\ from\ pivot}$

Question 6

Force = N

Accepted Answer

true

Answer

false

Question 7

Formula for spring constant

Accepted Answer

$\frac{Force}{dis an ce\ from\ pivot}$

Answer

$\frac{Force}{dis an ce\ from\ pivot}$

Answer

$\frac{Force}{dis an ce\ from\ pivot}$

Question 8

Pressure is proportional to depth

Accepted Answer

true

Answer

false

Question 9

SI unit for pressure

Accepted Answer

Pa

Question 10

Unit for water

Accepted Answer

g/cm3

Question 11

What do you need to calculate the kinetic energy?

Accepted Answer

square speed

Question 12

The smaller force, the greater work is done

Accepted Answer

false

Answer

true

Question 13

$\frac{Force}{dis an ce\ from\ pivot}$

Accepted Answer

true

Answer

false

Question 14

How can power be increased?

Accepted Answer

increase the work in a given time

Answer

reducing energy

Answer

increases the distance and the work

Question 15

How do you call the process of gas turning into water?

Accepted Answer

condensing

Answer

evaporating

Answer

solidifying

Answer

melting

Question 16

Unit for volume

Accepted Answer

cm3

Answer

cm2

Answer

m2

Answer

Pa

Question 17

A kettle heats 1.5 of water. How much ENERGY is need to raise the temperatur of the water from $\rho=\frac{m}{v}$ to $100\degree C$ ?Assume that the specific heat capacity of water =4200J(kgC)

Accepted Answer

504000 J, 504kJ

Question 18

What are metals

Accepted Answer

Conductor

Answer

Pretty

Answer

Gold

Answer

Insulator

Question 19

Infrarred radiation requieres a medium to travel (it can't travel through a vacuum)

Accepted Answer

false

Answer

true

Question 20

Metals are good conductors because...

Accepted Answer

they have free electrons

Answer

they can heat

Answer

they can

Answer

they have neutrons

Question 21

All sounds are caused by vibrating sources

Accepted Answer

true

Answer

false

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