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