Conceptual Chemistry Practice Problems (DISCLAIMER: his questions rely on the multiple choice examples which he has no given us so some answers wont make sense but the answer will be in one of the multiple choice options that he gives us)
a 750 W motor might also be rated as
1 horsepower motor
which of the following conversion factors would you use to change 18 kilometers to meters
1 km = 1000m
on a celcsius scale, at what temp does water boil
100 degrees
a brick weighs 26 N. measured underwater, it weighs 11 N. what is the size of the buoyant force exerted by the water on the brick
15 N
where is the fluid pressure greatest
2 meters below the surface of a swimming pool
supposed the gravitational force between two massive spheres is 100 N. if the distance between the spheres is doubled, what s the force between the masses
25 N
if the air balloon exerts a force of 1.5 N on an area of 0.5 m^2, what is the pressure inside the balloon
3 N/m^2
if you preform 40 joules of work lifting a 10 N box from the floor to a shelf. how high is the shelf
4 m (guessing on the units because no enough information if given)
A car traveled 60 km in 2 hours, 84 km in the next hour, and then 68 km in 2 hours before reaching its destination. What was the car's average speed?
42 km/hr
a wave has a wavelength of 10 mm and a frequency of 5.0 hertz. what is its speed
50 m/s
timers at a swim meet used four different clocks to time an event. which recorded time is most precise
55.245 s
if a force of 12N is applied to an object with a mass of 2 kg, the object will accelerate at
6 m/s^2
how is 0.00069 put into scientific notation
6.9 x 10^-4
the SI unit of force is
Newtons
the lens of a human eye focuses light by
OKAY I LOOKED EVERYWHERE FOR THIS ANSWER AND GOT NOTHING so just know that the pupil expands and contracts which is regulating the amount of light entering the eye. the retina is sensitive to light and receives the images that are being looked at
most of the circuits in your home are
Parallel circuits
What is the SI unit for pressure
Pascal (Pa)
in order to calculate pressure exterted on a surface, what quantity is divided by the surface area
Pressure = force/surface area
which of the following represents Ohm's law
V = I x R
what is the SI unit of electric power
Watt
the difference between a hypothesis and a theory is that a hypothesis is
a theory is a conclusion after numerous experiments while a hypothesis is a guess before doing the experiment
the rate at which velocity changes is called
acceleration
the slope of a speed-time graph indicates
acceleration
what is instantaneous acceleration
acceleration at a particular instance
how are science and technology related
advances in science may lead to advances in technology and vice versa
your friend says that the heavyweight champion of the world cannot exert a force of 95 N on a piece of tissue paper with his best punch. the tissue paper is held in midair, no wall, no tricks
agree that it cannot be done
which of the following statements is true about an airplane wing during flight
air above the wing travels faster than the air below it
newtons prism experiments showed that white sunlight is made up of
all colors of the visible spectrum
photons travel outward from a light bulb in
all directions
the type of current in your school is mostly
alternating current
a piano, violin, or guitar uses the resonance of a wooden soundboard to
amplify the sound
what are the building blocks of matter
atoms
if the north pole of a magnet is brought near the south pole of another magnet, the poles will
attract
if the two charges represented in Figure 20-1 were brought near each other, they would
attract
the efficiency of a machine is always less than 100 percent because
because there will always be friction
polarized sunglasses work by
blocking the light waves that vibrate in one plane
the upward force acting on an object submerged in a fluid is called
buoyant force
a person drives north 6 blocks, then turns west, and drives 6 blocks. the driver then turns south and drives 6 blocks. how could the driver have made the distance shorter while maintaining the same displacement
by driving 6 blocks west from resting point
the force that keeps an object moving in a circle is called
centripetal force
walking converts what type of energy into mechanical energy
chemical energy
what is biomass energy
chemical energy stored in living things
which of the following provides electrical safety
circuit breaker, fuse, and a ground-fault circuit interrupter
in an earthquake, a P wave is a longitudinal wave. it moves through soil and rock as a series of
compression and rarefaction
as your altitude increases, air pressure ________________
decreases
as an astronaunt travels far away from Earth, her weight...
decreases because the gravity decreases
a drawback of solar energy is that it
depends on the climate
what type of current is produced by a battery
direct current
when droplets of water in the atmosphere act like prisms, then colors in sunlight undergo
dispersion
work is a transfer of
energy
which of the following statements is true according to the law of conservation of energy
energy cant be created nor destroyed
an incandescent light bulb produces light when electrons flow through the
filament
a player hits a ball a bat. the action force is the impact of the bat against the ball. what is the reaction to this force
force of the ball hitting against the bat
to find amplitude, measure
from the crest to rest position from the trough to rest position
which of the following substances will float in corn syrup? (the density of corn syrup is 1.38 g/cm^3)
glycerin
which of the following universal forces is the weakest
gravitational
the forces acting on a falling leaf are
gravity and air resistance
the gravitational potential energy of an object is always measured relative to the
height of the object
nonrenewable energy resources do no include which of the follwoing
hydrogen fuel cells
the gravitational force between two objects increases as mass
increases or distance decreases
the property of matter that resists changes in motion is called
inertia
the energy of motion is called
kinetic
which part of a film camera focuses incoming light rays
lens
the upward force acting on the wing of an airplane in flight is called
lift
objects in free fall near the surface of the earth experience
linear motion
according to newtons second law of motion, the acceleration of an object equals the net force acting on the object divided by the objects
mass
the equation E=MC^2 relates to energy and
mass
a florescent light tube usually contains
mercury vapor
which of the following materials conducts heat well
metal
the product of an objects mass and velocity is its
momentum
the source of all magnetism is
moving electric charge
whenever an object exerts a force on another object, the second object exerts a force of the same magnitude, but in opposite direction to that of the first object
newtons third law
in which of the following is no work done
none of the above
in which of the following does Einstein's famous equation apply
nuclear fission and fusion reactants
the motion of an object looks different to observers in different __________
perspective or frame of reference
the energy stored in gasoline is
potential
the primary colors of light are
red, blue, green
solar cells convert what type of energy into electrical energy
solar energy
walking across a carpet is an example of charge being transferred by
static electricity and friction
heat is the transfer of thermal energy form one object to another because of the difference in
temperature
a train approaching a crossing changes speed from 25 m/s to 10 m/s in 240s. how can the trains acceleration be described
the acceleration is negative
when a surfer rides an ocean wave on her surfboard, she is actually riding on
the crest of the surface wave
speed is the ratio of the distance an object moves to
the direction the object moves
an ambulance siren sounds different as it approaches you than when it moves away from you. what scientific term would you use to explain how this happens
the doppler effect
projectile motion is caused by
the downward force of gravity and an initial forward velocity
the full range of frequencies of electromagnetic radiation is called
the electromagnetic spectrum
why is the gravitational potential energy of an object 1 meter above the moon's surface less than its potential energy 1 meter above the earths surface
the gravity is different
when a unbalances fore acts on an object
the object will move
where will the greatest increase in pressure occur if you squeeze the middle of an upright, closed soft-drink bottle
the pressure will increase equally everywhere inside the bottle
which of the following states that absolute zero cannot be reached
the third law of thermodynamics
sonar equipment sends sound waves into deep water and measures
the time delay of the returning echoes
atmospheric pressure is caused by
the weight of the atmosphere pushing down itself and on the surface below it
which distance can be most accurately measured with a ruler
the width of a book
as the temperature of an object rises, so does the
thermal energy
which of the following increases when an object becomes warmer
thermal energy
nuclear power plants are designed to convert nuclear energy into what type of energy
thermal/electrical energy
what type of mechanical wave needs a source of energy to produce it
transverse, longitudinal, and surface waves
the strength of the buoyant force acting on an object in a fluid depends on the object's
volume
light acts as a
wave
the type of force measured by a grocery store spring is ___________
weight
when a pair of balanced forces acts on an object, the net force that results is
zero