M1 - GEN PHYSICS
C. 2x10⁶ bytes
Data allocation in cellphone load depends on the amount that you pay. If you are using a prepaid sim and you purchased Cellphone load of 99 pesos with data allocation of 2 Mb, how is this data expressed in scientific notation? a. 2x10² bytes b. 2x10³ bytes c. 2x10⁶ bytes d. 2x10⁹ bytes
D. 9.834x10-³
How is the number 0.009834 expressed in scientific notation? a. 9.834x10⁴ b. 9.834x10-⁴ c. 9.834x10³ d. 9.834x10-³
A. 0.0254
How many meters are there in an inch? a. 0.0254 b. 0.254 c. 2.54 d. 24.5
D. 7
How many significant figures are there in 6712.460 a. 3 b. 4 c. 6 d. 7
A. 0.00001 s
Given the speed of light as 3x10⁸ m/s, how much time would it take for light to travel 10,000 ft? 1 inch = 2.54 cm a. 0.00001 s b. 0.00010 s c. 0.00100 s d. 0.01000 s
small value of standard deviation
means that the measurements are close to their average
vectors
can be added graphically and analytically
graphical method
can be done thru parallelogram method or polygon method
analytical method
can be done using law of sines and cosines, and component method
parallelogram method
can be used to add three or more vectors
physical quantities
can either be scalar or vector
component method
component method is used when more than two vectors are to be added
time and temperature
examples of scalar quantities
velocity force displacement acceleration
examples of vector quantities
C. the direction angle of B is equal to the direction angle of A plus 180°
if A and bare vectors and B = -A, which of the following is true? a. the magnitude of B is equal to the negative of the magnitude of A b. A and B are perpendicular c. the direction angle of B is equal to the direction angle of A plus 180° d. A + B = 2A
A. 15 m/s
if a ball is thrown with a velocity of 25 m/s at an angle of 37° above the horizontal, what is the vertical component of it's velocity? a. 15 m/s b. 18 m/s c. 20 m/s d. 25 m/s
Physics
is a field of science that deals with the interaction of matter, force and energy
standard deviation
is a measure of how diverse or spread out a set of measurements is from their mean or average
percent difference
is a measure of how far apart the different measured values are from each other, and is therefore an indication of precision
accuracy
is how close a measurement is to the correct value for that measurement
percent error
is usually considered in judging the accuracy of a measurement
scientific notation
it is a product of a number (mantissa) greater than or equal to 1 and less than 10 and a power (or exponent) of 10
quantity: mass unit: kilogram symbol: Kg
it is the actual mass of platinum-iridium cylinder kept at the international bureau of weights and measures in Sévres, France
quantity: temperature unit: kelvin symbol: K
it means fraction if 1/273.16 of the triple point of water
quantity: amount of substance unit: mole symbol: mol
it refers to amount of substance that contains as many atoms or molecules as there are atoms in 0.012 kg of carbon-12
quantity: luminous intensity unit: candela symbol: Cd
one candela is the luminous intensity in a given direction of a source that emits a monochromatic radiation of frequency 540x10¹² Hz and that has a radiant intensity in that direction of 1/683 watts per steridian
D. The units are not comparable
Which of the following SI units of measurements is the largest? a. milligram b. kilometer c. microsecond d. the units are not comparable
A. 5.4
a density of 5400 kg/m³ is equal to _________ g/cm³ a. 5.4 b. 54 c. 540 d. 5400
B. 5.0 m
a student adds two displacements with magnitudes of 3.0 m and 4.0 m, respectively. the angle of separation between the vectors is 45°, what is the resultant vector? a. 1.3 m b. 5.0 m c. 6.8 m d. 7.8 m
C. 7.99 m
a student walks 10 m, 37° of east. what is the horizontal component of the displacement of this motion? a. 3.99 m b. 5.0 m c. 7.99 m d. 10.0 m
error
an ______ results because of the deviation of measured data from being precise
laws of sines and cosines
are being used if the triangle formed by adding two vectors is not a right triangle
physical quantities
are expressed in terms of units of measurements which are defined by standards
vector quantities
are quantities that can be described by both magnitude and direction
random errors
are results unpredictable or inevitable changes during data measurement
scalar quantities
are those that can be described with magnitude only
D. 107.09 inches
robert wadlow is considered the tallest man ever, according to guiness book od world records, with an unprecedented height of 272 cm. how tall is he in inches? a. 136 inches b. 123.6 inches c. 108.8 inches d. 107.09 inches
large standard deviation
signifies that measurements are diverse
precision
states how well repeated measurements of something generate the same or similar results
A. force
the following are physical fundamental quantities except a. force b. length c. luminous intensity d. mass
C. speed
the following are vector quantities except a. acceleration b. velocity c. speed d. displacement
meter kilogram second kelvin ampere candela mole
the fundamental units, or base units for the fundamental physical quantities
A. 0°
the magnitude of the resultant vector of two vectors is greatest when the angle between them is.... a. 0° b. 45° c. 90° d. 180°
B. zero
the resultant of two vectors depends on the angle between them. Maximum magnitude of the resultant is obtained if the angle between them is a. at minimum (not zero) b. zero c. 90° d. 180°
resultant vector
the sum of two or more vectors is called......
C. 0.75 hour
the world's fastest train is a maglev bullet train that can reach a speed of 600 km per hour. mainland palawan is approximately 450 km long. hypothetically, if you are to travel the mainland palawan via the said fastest bullet train, how long would it take you to reach the end point of you came from the other end point? a. 0.25 hour b. 0.50 hour c. 0.75 hour d. 1.00 hour
international standard or systéme International (SI)
these standards are listed in the metric system, officially termed as......
quantity: length unit: meter symbol: M
this is distance travelled by light in a vacuum in 1/299,792,458 second
quantity: electric current unit: ampere symbol: A
this is the constant current flowing in each of two long parallel wires, 1.0m apart, that produce between these wires a force equal to 2x10-⁷ newton per meter length of each wire
polygon method
this method is also called head-to-tail method. this is more convenient to use if you are adding three or more vectors
quantity: time unit: second symbol: S
this refers to the duration for 9,192,631,770 cycles of the microwave radiation corresponding to the transition between two lowest states of cesium atom
variance
this statistical measurement is another way to estimate errors from multiple measurements of a physical quantity
B. random error
uncontrolled changes in air pressure while determining the boiling point of a liquid give arise to? a. personal error b. random error c. relative error d. systematic error
systematic errors
usually come from the measuring instrument or in the design of the experiment itself
B. 3.0000 represents quantity that is known more precisely than 3.0
what is the difference between 3.0 and 3.0000 a. 3.0000 could be the result of an intermediate stop in a calculation; 3.0 has to result from a final step. b. 3.0000 represents quantity that is known more precisely than 3.0 c. there is no difference d. they convey the same information, but 3.0 is preferred for ease of writing
percentage error or simply percent error
when there is an expected or true value of a quantity, __________ is usually calculated
D. voltage
which is a derived quantity a. electric current b. temperature c. time d. voltage
variance
which is derived from the word vary, measures the squared deviation of each number in the set from the mean
standard deviation
which is the square root of variance
D. polygon method
which method of adding vectors is otherwise known as the head-to-tail method? a. component method b. graphical method c. parallelogram method d. polygon method
A. force
which of the following is a derived quantity? a. force b. mass c. temperature d. time
A. component method
which of the following methods is more convenient to use in adding more than two vectors? a. component method b. cosine law c. sine law d. parallelogram method
A. precise measurements are always accurate
which statement is not true? a. precise measurements are always accurate b. accurate measurements are always precise c. precise measurements can be inaccurate d. inaccurate measurements can be precise
D. scalar quantities can be added to other scalar quantities using ordinary addition
which statement is true concerning scalar quantities? a. scalar quantities have both magnitude and direction b. scalar quantities can be added to vector quantities using rules of trigonometry c. scalar quantities can be added to other scalar quantities using rules of trigonometry d. scalar quantities can be added to other scalar quantities using ordinary addition