Physics

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

published on January 27, 20163 responses 0 5.0★ / 5

the advantage to using a pulley is that it

allows you to do less work
shortens the distance
reverses direction

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

To measure voltage, you use

a barometer
a multimeter
an ammeter

Batteries are

AC
DC
Nice

What is the force like quantity in a thermal system?

force
voltage
temperature difference

psi is also

Distance =

F/a
v/m
m/v

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

You use a voltmeter to

measure potential difference
measure current
measure pressure

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

balance; scale
manometer; scale
scale; balance

AC's voltage source is from

a voltmeter
a battery
a generator

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

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

Work is expressed in

What is the force like quantity in a fluid system?

force
pressure
voltage

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

sensible heat (on the table) is

horizontal
diagonal
vertical

An ideal machine has

a bad effiency
no friction
lots of pressure

P (atmosphere) + P (gage) =

AC vs DC

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

In a real machine

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

pressure=

F/A
N/m
m x a

Characteristics of weight are

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

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

Efficiency is

Work/mass
F x d
work out/ work in

Newton's third law is

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

what's the equation for sensible heat?

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

In q=mcat, what does q stand for?

heat energy
specific heat
specific gravity

Specific gravity has a unit

True
False

What's the conversion for celcius to fahrenheit?

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

force
pressure
torque

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

force
pressure
temperature difference

resistance is given in

Heat can be expressed in

amps or volts
calories or joules
calcious or fahrenheit

Newton's first law?

Law of inertia
Law of acceleration
law of interaction

Heat moves from

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

Which is the bigger degree?

1 degree fahrenheit
1 degree celcius

The heat required to melt a substance

latent
sensible
calories

current is given in

coulombs are the variable for

T=

Force x distance
Mass x acceleration
Force x mass

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

fraction of Earth weight on moon

1/10
1/6
1/4

How do you measure the density of a liquid?

manometer
ammeter
hydrometer

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

What units is torque given in?

kg
N x m
m/s2

What is the force like quantity in an electrical system?

pressure
voltage
force

The upwards force exerted on a floating object by a fluid