Physics

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

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

current is given in

The upwards force exerted on a floating object by a fluid

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

force
pressure
temperature difference

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

Distance =

F/a
v/m
m/v

T=

Force x distance
Mass x acceleration
Force x mass

psi is also

How do you measure the density of a liquid?

manometer
ammeter
hydrometer

What's the conversion for celcius to fahrenheit?

work =

F x d
F x mass
F x A

The heat required to melt a substance

latent
sensible
calories

Heat can be expressed in

amps or volts
calories or joules
calcious or fahrenheit

Newton's third law is

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

In q=mcat, what does q stand for?

heat energy
specific heat
specific gravity

Efficiency is

Work/mass
F x d
work out/ work in

pressure=

F/A
N/m
m x a

What units is torque given in?

kg
N x m
m/s2

Heat moves from

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

In a real machine

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

fraction of Earth weight on moon

1/10
1/6
1/4

AC vs DC

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

Which is the bigger degree?

1 degree fahrenheit
1 degree celcius

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

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

force
pressure
torque

the advantage to using a pulley is that it

allows you to do less work
shortens the distance
reverses direction

What is the force like quantity in a thermal system?

force
voltage
temperature difference

An ideal machine has

a bad effiency
no friction
lots of pressure

To measure voltage, you use

a barometer
a multimeter
an ammeter

what's the equation for sensible heat?

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

AC's voltage source is from

a voltmeter
a battery
a generator

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

You use a voltmeter to

measure potential difference
measure current
measure pressure

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

Characteristics of weight are

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

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

Work is expressed in

P (atmosphere) + P (gage) =

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

balance; scale
manometer; scale
scale; balance

Newton's first law?

Law of inertia
Law of acceleration
law of interaction

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

coulombs are the variable for

What is the force like quantity in an electrical system?

pressure
voltage
force

What is the force like quantity in a fluid system?

force
pressure
voltage

Specific gravity has a unit

True
False

sensible heat (on the table) is

horizontal
diagonal
vertical

Batteries are

AC
DC
Nice

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

resistance is given in