Question

@agent0smith

Answer 1

A torque wrench measures torque in units of foot-pounds. In the metric system, torque is measured in:...?
Newton joules
Watt meters
Newtong meters
Kilogram seconds
Joule meters
Ohm coulombs

Answer 2

Nm

Answer 3

A mechanic lifts a 10,000N car on a hydraulic lift. If the load-bearing cylinder of the lift has a cross-sectional area of .00400m^2 and the other piston has a cross-sectional area of .00010m^2, how much force must be exerted on the smaller piston to hold the car up?

Answer 4

F=ma
Right?

Answer 5

pressure is force over area

Pressure on one side = pressure on the other

Answer 6

\[\large \frac{ F_1 }{ A_1 }=\frac{ F_2 }{ A_2 }\]

Answer 7

Does the 10000 matter in this problem

Answer 8

Yes. Make F1 and A1 the 100000 and 0.004, A2 0.0001

Answer 9

What?
10000/ .00400 = x/.00010
??

Answer 10

Yep

Answer 11

so.....
.00010(10000/.00400)
??

Answer 12

250N?

Answer 13

Yep

Answer 14

A deep, slow river is moving at .5m/s. If it goes through a canyon which squeezes the river down to one-fourth its original size, the velocity of the river is:
unchanged
1.0m/s
2.0m/s
3.0m/s
4.0m/s
5.0m/s

Answer 15

" one-fourth its original size," means the speed goes up by a factor of four

Answer 16

so 4?

Answer 17

4 times the original speed

Answer 18

So 2

Answer 19

Two equal charges exert a force on each other. If the distance between the two charges doubled, the force between them is....
The same
Half of the original force
one-fourth of the original force
twice the original force<<<<?
four times the original force

Answer 20

We did ones like that recently.

It's 1/r^2, so 2 times the distance means 1/2^2 times the force

Answer 21

a 6-ohm and a 3-ohm resistor are connected in series with a 1.0V battery. Which of the following are true?
The current through the battery is 2amps
The voltage drop across each resistor is 2.0 volts
the voltage drop across each resistor is the same
The smaller resistor carries the larger the current
The current is the same through both resistors

Answer 22

In series circuits, current is always the same

Answer 23

A 6-ohm and a 3-ohm resistor are connected in parallel with a 1.0V battery. Which of the following are true?
The power output is the same for both resistors
The voltage drop across each resistor is 2.0 volts
The voltage drop across each resistor the same<<<?
The smaller resistor carries the smaller current
The current is the same through both resistors

Answer 24

In parallel, voltage is always the same

Answer 25

so i was right then

Answer 26

The reason that the North end of a compass needle points to the North is because
It's attracted to Santa's workshop
It's attracted to the magnetic North pole
It's attracted to the magnetic South pole
It's attracted to the geographic North pole
It's attracted to the geographic South pole

Answer 27

It's attracted to the magnetic South pole

Answer 28

Thought so

Answer 29

Sound wave is longitudinal wave right?

Answer 30

Yes

Answer 31

A guitar string is .8m long. It is vibrating so that there is a node at each end and one in the middle. What is the wavelength of this wave?
How would i figure out this one? I know it's something like....