PHSC 1001- LSUA Parvez Final Exam
a new world record in weight lifting was set in Sydney Olympics in 2000 by lifting a 4000kg mass. The lifter raised the mass 2m above the ground. How much work is done by the lifter to lift the weight?
(4000 x 10 x 2)J
at normal atmospheric pressure, the freezing point of ethanol is -117.3*C, and the boiling point its 78.5*C. What is the melting point of ethanol?
-117.3*c
an object initially moving at 40 m/s slows down to 10m/s is 6 seconds. What is its acceleration?
-5m/s^2
the velocity of sound is 340 m/s. the wavelength of around with frequency 200HZ is
1.7m
The formula for calculating the kinetic energy of an object is
1/2mv^2
how much is the Earths gravitational pull on a 1-kg object on the surface of the earth?
10 N
A person lifts a heavy load to a vertical height of 2.0 m. the mass of the load is 500kg. How much work did he do?
100,000 Joules
how much does the speed of a free falling object change i one second?
10m/s
how much does the speed of a free falling object change in one second?
10m/s
a toy plane moves at a constant speed of 3m/s. How long does it take to travel a distance of 51 m?
17 s
two planets have identical diameters but differ in mass by a factor of 25. What will be your weight in the more massive planet compare to that in the other planet?
25 times more
the amplitude of a particular wave is 1 m. The top to bottom distance of the wave is
2m
ALPO4 contains how many oxygen atoms?
4
A student rides a bicycle up a 30 degree hill at a constant speed of 10.00 meters per second. The combined mass of the student and bicycle is 80.0 kilograms. what is the kinetic energy of the student-bicycle system during this ride?
4000J
a professional mover moves a box 10 meters by approaching a force of 500 Newtons. How much work did he do?
5,000 Joules
convert 567 meters into centimeters
5.67 x10^4 cm
if your mass is 70kg on Earth, what is it on the Moon?
70kg
you throw a ball from the ground upward with a speed of 40m/s. How much time passes before the ball strikes the ground? (disregard air resistance)
8.0s
Your experiment is a failure is the data do not support your hypothesis True or False
False
Sulfuric acid is a. HCL b. H2SO4 c. HNO3 d. NAOH
H2SO4
Consider the reaction HCl + NH3----> NH4Cl. Identify the acids and bases
HCL is the acid and NH3 is the base
why was Ptolemys treaties considered a scientific work?
It was based on observation only
the most common unit system scientist use is called
SI unit
a work is done by
a force
an atom that loses its outer electron or electrons readily is
a metal
A base is defined as
a proton acceptor
a force is described as
a push or pull
what is meant by the term compound?
a substance made up of two different turps of atoms chemically combined
How does the position change in Uniform motion? a. the change in position is equal in equal amount of time b. the position changes at the same rate c. the position is directly proportional to time d. all of the above
a. all of the above
To convert any metric measurement preceded by the prefix "kilo" to the base unit, you should multiply by a. 1000 b. 10^3 c. all of the above
all of the above
What is always correct about a neutral atom?
an atom has equal number of electrons and protons
Theoretically, how far away from the Earth do you have to go to feel zero gravitational force from the Earth?
an infinite distance
a work is done on
an object
a heavy object and a light object are dropped from the same height at the same time. The heavier object will reach the ground (disregard air resistance)
at the same time as the lighter object
A heavy object and a light object are dropped from the same height at the same time in a vacuum. The heaviest object will reach the ground....
at the same time of the lighter object
which of the following are true for an element? a. atomic number = number of protons + number of electrons b. atomic number - number of protons c. mass number = number of protons -number of neutrons d. atomic mass= number of protons
b. atomic number = number of protons
a longitudinal mechanical wav causes particles of a material to move
back and forth and in the same direction the wave is moving
measurements in science are communicated by using
both a numerical value and a unit
in a reaction in which hydrogen reacts with oxygen to produce water, which substance are the reactants?
both hydrogen and oxygen
What are the coefficients needed to balance this chemical equation? C2H6 + ___O2 --------> ___CO2 +___H2O a. 1,3,2,3, b. 1,5,2,3, c. 2,7,4,6 d. 2,5,4,3
c. 2,7,4,6
What does directly proportional mean? a. when one variable doubles the other also doubles b. when one variable changes the other changes by the same proportion c. all of the above
c. all of the above
the law of gravity says that two objects attracts with a force a. directly proportional to their masses b. inversely proportional to the square of their distance c. all of the above d. inversely proportional to their masses
c. all of the above
an atom with 3 protons and 4 neutrons has a. atomic number 7 and mass number 4 b. atomic number 3 and atomic mass 7 c. atomic number 3 and mass number 7 atomic number 4 and mass number 3
c. atomic number 3 and mass number 7
compared with metal, non metals in general are a. better conductors of heat b. better conductors of electricity c. poor conductors of heat d. more malleable
c. poor conductors of heat
you want to measure the length of a mouse's tail. Which Si measurement unit would you use?
centimeter
properties of matter that can be observed with changing the substance into another substance are known as
chemical properties
the reaction 2Mg +O2-----> 2MgO is a
combination reaction
what is the term for the process that is the opposite of evaporation?
condensation
waves combine to make a wave with larger amplitude in a process called
constructive interference
how many atoms of oxygen are represented in 2CA(NO3)2 a. 4 b. 6 c. 10 d. 12
d. 12
which of the following refers to acceleration? a. 70m b. 75m/s c. 70m/s towards north d. 70 m/s2
d. 70m/s2
acceleration means a. how fast an object changes its velocity b. the rate of change of velocity with respect to time c. how fast an object is getting faster d. all of the above
d. all of the above
how does the position change in Uniform motion? a. the change in position is equal in qual amount of time b. the position changes at the same rate c. the position is directly proportional to the time d. all of the above
d. all of the above
which of the following is correct for waves? a. v=f/ b. f= v/ x c. f= 1/t d. all of the above
d. all of the above
Bohr's Model of the atom included that idea that a. the electron can have only certain orbits or energies b. electrons absorb energy or light by moving to higher energy orbits c. electrons emit energy as light when they move to lower energy orbits d. all of the above are correct e. none of the above are correct; electron can have any orbit like a miniature solar system
d. all of the above are correct
an aqueous solution is highly conducting to electricity. The solutions contains a. acid b. base c. salt d. any or all of the above
d. any of all of the above
emission spectra a. are produced when photons are emitted from existed atoms b. has only certain colors of light c. has a continuous color of light d. both a and b
d. both a and b
in a space or vacuum the speed of light depends on its a. frequency b. wavelength c. amplitude d. none of the above, it is constant
d. none of the above it is constant
spreading of a wave as it passes through a gap or around an edge is called
diffraction
the main difference(s) between a radio wave and a light wave is (are) its a. speed b. wavelength c. frequency d. both a and b e. both b and c
e. both b and c
wave motion in a medium transfers
energy, only
a lot of work is done in a tug-of-war? true or false
fasle
a block of mass m is pulled over a distance d by an applied force F which is directed in parallel to the displacement. How much work is done on the block by the force F? a.mFd b. zero c. Fd
fd
two identical cars, one moving with a speed of 20 mi/h another with 40mi/h. compared to the slower car the faster car has
four times more kinetic energy
the lowest energy state or level of an atom is the
ground state
which group does Iodine (I) belong?
halogens
an objets falling freely has an acceleration that is (disregard air resistance)
increasing
which of the following can only be explained by a wave model of light?
interference
how does calcium obey the octet rule when reacting to form compounds?
it gives up electrons
an aqueous solution of lime juice causes a light bulb to light. What does this tell you about lime juice?
its an electrolyte
an atom emits a photon when one of tis orbital electrons
jumps from a higher to lower energy level
a halogen atom
lacks one element of having a filled out shell
an object that has potential energy has this energy because of its
location
the three basic unites in the SI system are
meter,kilogram and second
an object that has kinetic energy must be
moving
isotopes of the same element must have different numbers of
neutrons
an objets is moving in a circular path at a constant speed. the force acting on the object is
not zero
sound and light waves both
obey the laws of diffraction
a transverse mechanical wave causes particles of a material to move
perpendicular to the direction the wave is moving
salt dissolved in water is an example of
physical change
which of the following best fits Thomson's model of the atom?
plum pudding
a ball is projected vertically upward and then returns to the ground. During its flight
potential and kinetic energy change, but the total energy does not
if the speed of an object is doubled, what will happen to its kinetic energy?
quadruples
which of the following electromagnetic waves has the lowest frequency?
red light
as an object falls freely, its gravitational potential energy
reduces and converts to the kinetic energy
the term inertia means: the tendency of an object to.....
remain in motion
which atomic model was the first to include a nucleus?
rutherfords model
how many fundamental units or standards are there?
seven
diffraction is more pronounced through relatively
small openings
HNO3 is a
strong acid
what would make you weigh half as much as you do right now?
take away half of the Earth mass
what is acceleration?
the rate at which velocity change
a person lifts a heavy load to a vertical height of 2.0m in 3 seconds. If he/she had done this more slowly in 6seconds, the work on the load would have been...?
the same
a ball rolling across the floor slows to a stop because
there is a net force acting on it
How many valence electrons does Al have?
three
which of the following occurs in a covalent bond?
two atoms share two electrons
elements within the same group in the periodic table have similar properties because they have the same number of
valence electrons
electromagnetic waves consist of
vibrating electric and magnetic fields
what is changed by destructive interference of a wave?
wavelength
a tennis ball is dropped. What force is acting on the ball as it is falling?
weight
the force of gravity acting on an object is also called the
weight
you are driving a car with 55mi/hr in a straight highway. what are the forces acting on your car? What is the net force acting on your car?
weight normal force applied force and friction net force is zero
of the following, the electromagnetic waves with the shorter wavelength is
x rays
write a formula showing y is directly proportional to x
y=mx
can an object keep moving by itself without a push or pull?
yes
