Question

a circuit has a voltage drop of 27 v acroess a 30 resistor that carries a constant of 1.8 a how much power is used by the resistor use p=Vt

Answer 1

@Vocaloid

Answer 2

not really sure why they give you P = Vt but the power equation is just current * voltage

Answer 3

okay so it would be 27*30

Answer 4

30 is the resistance

Answer 5

30*1.8

Answer 6

the equation is current * voltage not current * resistance

Answer 7

so 27 x 1.8

Answer 8

yes

Answer 9

48.6

Answer 10

good

Answer 11

a sample contains 24 g of a radioactive isotope. hpw many after 2 half lives

Answer 12

12?

Answer 13

actually 6

Answer 14

@Vocaloid

Answer 15

6, good

Answer 16

what is the voltage drop across the 20 resistot?

Answer 17

would need to see a picture of this

Answer 18

10?

Answer 19

60

Answer 20

good, so if we treat the whole system as one resistor

V = IR

what is the current?

Answer 21

40

Answer 22

voltage = 120
resistance = 60 ohm

V = IR

I = ?

Answer 23

20

Answer 24

?

Answer 25

120 = I*60

solve for I

Answer 26

120/60 = ?

Answer 27

Applies principles of relativity rathan than Newtonian

Answer 28

Velocity of a satellite
Length of an accelerating car
Speed of object to the speed of light
Momentum of plane

Answer 29

Length?

Answer 30

?

Answer 31

I don't think an accelerating car is fast enough to not be able to be described w/ Newtonian physics

Answer 32

Needs to be described as relativity and uncertainty rather than Newtonian

Answer 33

Speed of object?

Answer 34

good

Answer 35

Can you please show an image of the absorption of a wave as it strikes surface

Answer 36

Does it go into the surface or does it just hit the surface

Answer 37

absorbed = goes into the surface (see diagram)

Answer 38

What describes water

Answer 39

Liquid over a wide tempature range

Has weak cohesive forces

Has strong cohesive forces

Is liquid over a narrow temp range

Answer 40

any ideas? only two of those 4 statements can be true

Answer 41

C and d

Answer 42

almost, it's liquid over a wide temp range not a narrow one.

Answer 43

Okay so a

Answer 44

good so A+C

Answer 45

It can only be one

Answer 46

uh then A I guess

Answer 47

As heat is added to a sample of water the kineticenergy of its molecules increases but the parrticles remain close. Which part of the heating curve illustrates this process

Answer 48

?

Answer 49

would need to see a diagram to better answer this, but keep in mind that heat is being added to water in its liquid state w/o changing to its gaseous state

Answer 50

any ideas? which part shows water increasing its temperature from its liquid state? be mindful of the temperature range across which water is a liquid

Answer 51

C

Answer 52

D

Answer 53

it is hard to tell because there are no labels on the axes

keep in mind water is liquid between 0 and 100C

Answer 54

Enery can enter and exit which of the folllowing systems

Answer 55

Both open and isolated
Both open and closed
Isolated only
Open only

Answer 56

D?

Answer 57

So open only

Answer 58

No both open and closed

Answer 59

good

Answer 60

Which of the following terms describes a process for which Q =-73J

Answer 61

Thermal insulation
Exothermic
Endothermic
Thermal conductor

Answer 62

Insulation?

Answer 63

Q is negative so the process is releasing heat, what's the term for this? starts with an e