Question

Please help?

Answer 1

This equation represents Newton's Second Law of Motion, F=ma. It shows the relationship of force, mass, and acceleration.

If the mass of an object is tripled, and the force acting on it is doubled, how will the object's acceleration be affected?

A.
Acceleration will be two-thirds the original value.

B.
Acceleration will be two times the original value.

C.
Acceleration will be one-half the original value.

D.
Acceleration will be six times the original value.

Answer 2

I got either A or D

Answer 3

\(\color{#000000 }{ \sf \displaystyle F=ma\quad \Longrightarrow \quad \quad a=F/m }\)

Your original acceleration is:
\(\color{#000000 }{ \sf \displaystyle a=F/m}\)

Your new acceleration is:
\(\color{#000000 }{ \sf \displaystyle a=(2F)/(3m)=(2/3)\times (F/m) }\)

Answer 4

So if your old acceleration is \(\color{#000000 }{ \sf \displaystyle (F/m) }\), and your new acceleration is \(\color{#000000 }{ \sf (2/3)\times (F/m) }\), then how can you compare the new acceleration to the old acceleration?

Answer 5

it will be two thirds times the old acceleration, so a?

Answer 6

Yes, that answer is A.
Well done!

Answer 7

thanks. i have a few more. can you help out some more?

Answer 8

Perhaps...

Answer 9

Which best explains why a washing machine does not represent a closed system?

A.
The amount of wash in a load varies.

B.
Most washers can use a variety of laundry detergent brands.

C.
It has multiple cycles, such as wash and spin.

D.
Water and power come from external sources.
I got D

Answer 10

A closed system is usually defined to be any system that doesn't \(\large «\)exchange anything with the surroundings of it\(\large »\). Also, the forces all come from the system itself (no external forces).

Answer 11

I suppose that you have to show why the washer is not a closed system...

Answer 12

the concept here is that nothing in the system is from outside (or "external").

Answer 13

so it could be b with the detergent

Answer 14

Yes, it's D...

Answer 15

oh so i was right

Answer 16

:]

Answer 17

I got to go.... (basketball with siblings)

Answer 18

sorry; bye

Answer 19

okay. thanks for the help

Answer 20

you welcome!