Physics

Force and work in Electrical, Rotational, Thermal, and Electrical Systems.

published on January 27, 20162 responses 0 5.0★ / 5

Heat moves from

hot air to cold air
warm temperature to cold tempature
high temperature to low temperature

coulombs are the variable for

If the wind is pushing north at 20 mi/hr, and a bird is flying south at 15 mi/hr, what is the resultant of combining the two vectors?

35
5
0

AC vs DC

current changes direction periodically; current in 1 direction
current in 1 direction; current changes direction periodically

AC's voltage source is from

a voltmeter
a battery
a generator

The upwards force exerted on a floating object by a fluid

How do you measure the density of a liquid?

manometer
ammeter
hydrometer

Characteristics of weight are

Select the three correct answers
lb, N
slug
how hard gravity pulls on a mass
can change
cannot change

what's the equation for sensible heat?

q=mc delta t
q= m x Hv
q=m x Hf

thermal energy is

measure of the average of each particle in the substance
sum total of the energy of all the particles within the substance

The principle that states that a change in pressure at any point in a confined fluid is transmitted undiminished throughout a fluid

Specific gravity has a unit

True
False

What's the conversion for celcius to fahrenheit?

psi is also

What is the force like quantity in an electrical system?

pressure
voltage
force

Efficiency is

Work/mass
F x d
work out/ work in

What do you use to measure weight? What do you use to measure mass?

balance; scale
manometer; scale
scale; balance

Which is the bigger degree?

1 degree fahrenheit
1 degree celcius

What units is torque given in?

kg
N x m
m/s2

Check the advantages to a simple machine

Select the three correct answers
allows you to do less work
reverses direction
shorter distance
make work easier

pressure=

F/A
N/m
m x a

What is the force like quantity in a fluid system?

force
pressure
voltage

fraction of Earth weight on moon

1/10
1/6
1/4

the advantage to using a pulley is that it

allows you to do less work
shortens the distance
reverses direction

current is given in

What is the force like quantity in a rotational mechanical system?

force
pressure
torque

Newton's third law is

the law of inertia.
the law of acceleration.
the law of interaction.

Batteries are

AC
DC
Nice

P (atmosphere) + P (gage) =

What is the force like quantity in a thermal system?

force
voltage
temperature difference

sensible heat (on the table) is

horizontal
diagonal
vertical

Work is expressed in

Newton's first law?

Law of inertia
Law of acceleration
law of interaction

Archimedes Principle says:

every action has a equal and opposite reaction
the upwards force on the object is equal to the weight of the fluid displaced
the ratio of the density of a substance is to the density of water

An ideal machine has

a bad effiency
no friction
lots of pressure

Heat can be expressed in

amps or volts
calories or joules
calcious or fahrenheit

T=

Force x distance
Mass x acceleration
Force x mass

Distance =

F/a
v/m
m/v

In q=mcat, what does q stand for?

heat energy
specific heat
specific gravity

To measure voltage, you use

a barometer
a multimeter
an ammeter

What is the force-like quantity in a mechanical system?

force
pressure
temperature difference

The heat required to melt a substance

latent
sensible
calories

If the compressor in a hydraulic lift exerts 30 psi of air on the hydraulic fluid, and the radius of the piston is 6 inches, the force is....

3393lb
4456lb
20lbs

In a real machine

work out = work in
work out > work in
work in > work out

resistance is given in

You use a voltmeter to

measure potential difference
measure current
measure pressure

work =

F x d
F x mass
F x A

The weight density of water is

14.7 psi
61 lb/ft3
62.4 lb/ft3

What is specific heat?

when an object is immersed in a fluid, the upwards force on the object is equal to the weight of the fluid displaced
amount of heat required to change the temperature of one gram of a substance by 1 degree
the ratio of the density of a substance to the density of water