Physics

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

published on January 27, 20163 responses 0
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1/49

An ideal machine has

a bad effiency
no friction
lots of pressure
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work =

F x d
F x mass
F x A
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The upwards force exerted on a floating object by a fluid

4/49

AC vs DC

current changes direction periodically; current in 1 direction
current in 1 direction; current changes direction periodically
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Efficiency is

Work/mass
F x d
work out/ work in
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T=

Force x distance
Mass x acceleration
Force x mass
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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
8/49

Heat can be expressed in

amps or volts
calories or joules
calcious or fahrenheit
9/49

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
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what's the equation for sensible heat?

q=mc delta t
q= m x Hv
q=m x Hf
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Newton's first law?

Law of inertia
Law of acceleration
law of interaction
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Specific gravity has a unit

True
False
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What units is torque given in?

kg
N x m
m/s2
14/49

Batteries are

AC
DC
Nice
15/49

Check the advantages to a simple machine

Hint: 3 choices
allows you to do less work
reverses direction
shorter distance
make work easier
16/49

What is the force like quantity in an electrical system?

pressure
voltage
force
17/49

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
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In a real machine

work out = work in
work out > work in
work in > work out
19/49

psi is also

20/49

What is the force like quantity in a fluid system?

force
pressure
voltage
21/49

fraction of Earth weight on moon

1/10
1/6
1/4
22/49

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

23/49

What is the force like quantity in a thermal system?

force
voltage
temperature difference
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In q=mcat, what does q stand for?

heat energy
specific heat
specific gravity
25/49

Work is expressed in

26/49

Which is the bigger degree?

1 degree fahrenheit
1 degree celcius
27/49

Heat moves from

hot air to cold air
warm temperature to cold tempature
high temperature to low temperature
28/49

the advantage to using a pulley is that it

allows you to do less work
shortens the distance
reverses direction
29/49

AC's voltage source is from

a voltmeter
a battery
a generator
30/49

The weight density of water is

14.7 psi
61 lb/ft3
62.4 lb/ft3
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What do you use to measure weight? What do you use to measure mass?

balance; scale
manometer; scale
scale; balance
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Distance =

F/a
v/m
m/v
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resistance is given in

34/49

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

force
pressure
torque
35/49

coulombs are the variable for

36/49

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

force
pressure
temperature difference
37/49

You use a voltmeter to

measure potential difference
measure current
measure pressure
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pressure=

F/A
N/m
m x a
39/49

sensible heat (on the table) is

horizontal
diagonal
vertical
40/49

How do you measure the density of a liquid?

manometer
ammeter
hydrometer
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current is given in

42/49

To measure voltage, you use

a barometer
a multimeter
an ammeter
43/49

Newton's third law is

the law of inertia.
the law of acceleration.
the law of interaction.
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The heat required to melt a substance

latent
sensible
calories
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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
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Characteristics of weight are

Hint: 3 choices
lb, N
slug
how hard gravity pulls on a mass
can change
cannot change
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P (atmosphere) + P (gage) =

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What's the conversion for celcius to fahrenheit?

49/49

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