Question

Final exam review help?!?!

Answer 1

I have 3 study sheets.

Answer 2

for # 1 i got 34km/h

Answer 3

no, you have to multiply by 3.6

Answer 4

why?

Answer 5

4.9 m change it to km it is 0.0049km/s * 60 *60 = 33.8

Answer 6

4.9 m change it to km it is 0.0049km
this is correct.

but then when you change seconds into hours you divide by 3600
since you divide it in the denominator it is like multiplying by 3600

so eventually

0.0049 * 3600 = 17.64 km/h

Answer 7

look at my draw

Answer 8

-> 0.0049km/s * 60 *60 = 33.8
it is 17.64 and not 33.8

Answer 9

0.0049 * 60 * 60 = 17.64

Answer 10

maybe you did mistake when you enter the numbers into the calculator

Answer 11

the options are 94,000 km/h
34 km/h
2.6 km/h
34,000,000 km/h

Answer 12

well what can i say :
http://www.unitconversion.org/velocity/meters-per-second-to-kilometers-per-hour-conversion.html
you may check yourself here

Answer 13

0.0049 * 60 * 60 = 17.64
do it in the calculator and see

Answer 14

m is for meters right ? :O

Answer 15

yes. Idk maybe the options are wrong. i keep getting 17.64 too.

Answer 16

i guess they are wrong

Answer 17

A physical quantity X depends on mass, distance, and time. Use dimensional analysis to decide which of these is a possible expression for X where a is acceleration, v is velocity, and F is force.
It's either X=Ft or X=1/2at^2 right?

Answer 18

well in x=1/2at^2 there is no mass

Answer 19

would X=Ft work?

Answer 20

you have options ?

Answer 21

yes
X=Ft
X=at
X=vt
and X=1/2at^2

Answer 22

yes Ft is the one

Answer 23

for 3 I want to say B?

Answer 24

no

Answer 25

(just to make sure that you understand
Ft units are [kg m / s] so it has mass distance and time)

Answer 26

now for 3. think what happens to y when x is small
and when x is big..

Answer 27

im confused

Answer 28

y = k/x

for low values of x like when x goes to zero
y will be very large

for high values of x like when x goes to infinity
y will be very low

agree ?

Answer 29

yes so thus my answer is A? AS X gets larger Y gets smaller.

Answer 30

yes ! A

Answer 31

A balloon is expanded to the same volume as that of a human head. Do an order-of-magnitude estimate of the volume of this balloon in cm3

Answer 32

1,000 cm3?

Answer 33

i think it iscorrect

Answer 34

Which equation represents inverse proportionality?
y=mx?

Answer 35

y=mx is linear proportionality direct ..

Answer 36

y=mx
y=mx^2 +b for nonzero b
y=m/x
y=mx^2

Answer 37

we had one like this before ..
we want inverse
so when one is high the other is low
and when one is low the other is high ...

Answer 38

so how would that be represented by an equation?

Answer 39

y=m/x
as i said we had something like this before
when we chose graph A