Physical Science- Test 1- Johnston
There are 10 mm in ______
1 cm
In buying a product, a shopper has a choice of the following amounts, all the same price. Which is the best buy? 432 cc, 1 pint, 1 half-liter, 450 mL
1 half-liter
What is the relationship between a yard and a meter?
1 yd=.914 m
A very tentative explanation of observations of some regularity of nature is a...
Hypothesis
Which is NOT a standard metric unit? kilogram, meter, second, gram
Gram
What are the seven base units of SI?
meter, length kilogram, mass second, time ampere, electric current kelvin, temperature mole, amount of substance candela, luminous intensity
What is a derived unit?
multiples or combinations of units area, volume, speed
Kilo
k thousand: 10^3
Which of the following is NOT a derived quantity? Volume, speed, mass, density
Mass
Displacement divided by time gives
average velocity
Giga
billion: 10^9 G
Centi
c one-hundreth: 10^-2
The metric prefix that means one-hundreth (1/100) is
centi-
Motion necessarily involves
change in position
Deci
d one-tenth: 10^-1
Deka
da ten: 10^1
Why do we need standard units?
enable us to describe things in a concrete way describe fundamental quantities "a fixed reproducible value for the purpose of taking accurate measurements
Hecto
h hundred: 10^2
Milli
m one-thousandth: 10^-3
Density describes
mass per unit volume
What is the difference between weight and mass?
mass- the amount of matter an object contains, kilogram, fundamental quantity (does not change) weight- derived quantity, gravitational attraction on an object by a celestial body, this attraction varies based on its mass.
Nano
n one-billionth: 10^-9
The steps to an experiment include:
redefine the problem materials procedure observations/record what happens draw conclusions and make recommendations
How do you determine density?
D= mass/volume
A cubic centimeter of pure water at maximum density has a mass of
1g
What is the mass of 25 cm^3 of pure water?
25 g
What is the best angle for projectile?
45 degrees
An object with a mass of 5 kg is dropped and takes 9 s to hit the ground. Then another object with a mass of 10 kg is dropped from the same point. How long does it take to hit the ground?
9 seconds
What is air resistance?
9.8 m/s/s
A speedometer indicates _______ if the automobile is traveling forward.
Instantaneous Velocity ** velocity includes direction
Mega
M million: 10^6
What has a larger volume, a liter of water or a liter of mercury?
Neither, they have the same volume
What must be give to determine a location?
a reference point and a measurement scale
What is a hydrometer used for?
a weighted glass bulb that floats in liquids to measure density the denser the liquid the higher it floats
What is speed?
scalar quanitity, with only magnitude
Distance covered per unit of time is called
speed
What is terminal velocity?
still falling but not accelerating
The standard unit of time, the second is now defined with reference to...
the cesium-133 atom
An object transported from Earth's surface to the surface of the Moon has
the same mass, but different weight
For the multiplication of 7.443 m times 8.00 m, the results should be reported with how many significant figures?
three
Micro
u one-millionth: 10^-6
Will an object come to a stand still in the air?
yes
Will an object that accelerates up fall at the same rate?
yes
