PRACTICE MIDTERM
A truly educated person is knowledgeable about
- science - the arts - religion (all of the above)
To see his full height in a mirror, Blinky Bill of height 1.0 meter requires a mirror that is at least
0.50 m tall
One watt of power is equivalent to
1 joule per sound
A vibrating bob at the end of a vertical spring completes a cycle every 2 s. Its period is
1 seconds
A heavy stone is launched straight upward at 100 m/s. If air resistance can be neglected, the time to reach its maximum height is
10 seconds
A 12-volt battery supplies to each coulomb of charge
12 joules
A block of ice slides with a kinetic energy of 40 J. If it slides at twice the speed, its kinetic energy is
160 J
If she exerts 6 N across a distance of 2 m in 3 s she'll deliver a power of
4 W
In lifting a 5000-N piano via a pulley system, every 1 m of rope pulled down raises the piano by 0.1 m. Ideally, this indicates that the force needed to lift the piano is
500 N
A scientific hypothesis is
An educated guess
The first to be credited for Earth circling the Sun was
Copernicus
The scientist to be arrested for his views was
Galileo
Newton's second law focuses on
acceleration
Science, art, and religion need not contradict one another because
all three involve different domains
If the mass of Phil Physiker doubles, his weight
also doubles
Which has more mass?
an automobile battery
Which moving object has the greater momentum?
any of these depending on speed
A cannonball fired from a cannon begins to fall
as soon as it leaves the barrel
The least amount of energy needed to produce forced vibrations in an object occurs
at its natural frequency
The vibrations of a transverse wave move in a direction
at right angles to the direction of wave travel
Mass is a more fundamental quantity than weight because mass
both of these
A heavy and a light ball are dropped at the same time from a high tower. The ball to reach the ground first, assuming no air resistance, will be the
both together
A skydiver who falls at constant velocity is in a state of
dynamic equilibrium
A positive ion has too few
electrons
A stone whirled at the end of a rope follows a circular path. If the rope breaks, the stone tends to
follow a straight-line path
Different colors of light correspond to different light
frequencies
When a bowling ball slows as it rolls along an alley, we know that
friction acts on the ball
The scientific method is most effective in
gaining, organizing, and applying new knowledge
By Newton's third law, if action is the force the string pulls on the can to make it follow a circular path, the reaction force is then
idk
A crate sliding down an incline at a constant velocity is
in dynamic equilibrium
If an object has no acceleration of any kind, then we can say for certain that it is
in mechanical equilibrium
When you push a brick with twice as much force, the acceleration of the brick
increase
Current in a conductor can be increased by
increasing the voltage across it and reducing its resistance
Magnetic poles cannot be
isolated
Whereas potential energy is measured in joules, electric potential is measure in
joules/coulomb and volts
Pseudoscience is a field of
junk science
Infrasonic sound waves have relatively
long wavelengths and low frequencies
Surrounding a moving electron is
magnetic and electric field
A kilogram is a measure of
mass
An electron beam that is directed through a magnetic field
may be deflected and may experience a force
You are weightless when you
momentarily step off a curb lack a support force orbit in today's space stations
A Cadillac and a Mini Cooper roll down a hill at the same speed. While rolling the heavier Cadillac has greater
momentum
Any object that moves has
momentum
A moving vehicle has
momentum kinetic energy speed
A school bus on a highway brakes to a stop. More braking force is required if the bus has
more mass more momentum less stopping distance all of the above
Aristotle asserted that motion was characterized by
natural and violent motion
Which law most underlies the impulse-momentum relationship?
newtons second law
Scientists who falsify experimental results or data are generally given
no second chance
Which of these hockey pucks has zero acceleration?
one at rest one moving at constant velocity one in mechanical equilibrium
Light from a candle has a certain brightness 1 m away. At 2 m away its brightness is
one- quarter as much
Electric field lines about a tiny charged particle extend
outward when the charge is positive
An atom's nucleus has what kind of charge?
positive
We define inertia to be a
property of matter
When Galileo dropped balls from the Leaning Tower of Pisa, he
refuted Aristotle's teachings
You toss a ball upward. After it leaves your hand, the force of gravity on it
remains constant
The net force acting on an object is
the combination of all forces acting on it
Which is gravitationally attracted to Earth?
the moon and apple
A push of 1 N accelerates a 1-kg mass at 1 m/s2. A push of 2 N accelerates of a 2-kg mass
the same
The frequency of electromagnetic waves and the frequency of the vibrating electrons that produce them are normally
the same
A 10-kg brick and a 1-kg book are dropped in a vacuum. Acceleration of the 10-kg brick is
the same as that of the 1-kg book
In the spirit of science, science-oriented people must be willing to consider ideas
they dislike
Ultraviolet light that shines on a pane of transparent glass
transforms to thermal energy
If a pulse of laser light shines on the Moon and bounces back to Earth, it completes a round-trip in about. Earth and the Moon are separated by 3.84 X 10^8 m
two and a half seconds
If the masses of two planetary bodies doubles, and the distance between them decreases by half, the force between them would be
unchanged
Cave people discovered gravity. Isaac Newton discovered that gravity is
universal
A wiggle in time is a
vibration
When Nellie Newton steps off a stool she is momentarily
weightless
The source of electrons that comprise a shock is
your own body
The person most likely to fool you is
yourself
The sum of the forces that act on any object moving at constant velocity is
zero