Physics Final
centripetal force on an object in circular motion is in the same direction as the ___________
centripetal acceleration
The net force directed toward the center of an objects circular path is________
centripetal force
fusion occurs when nuclei...
combine
a billiard ball collides with a stationary ball in an elastic collision the first ball ....
comes to a rest
crests correspond to
compression
An object moving with uniform circular motion will have a ________ tangential speed
constant
What is the force that provide centripetal force on a bicycle?
friction
perceived loudness of a sound is measured in
decibels
simple harmonic motion
describes any periodic motion that is the result of a restoring force that is proportional to displacement
Tides are caused by......
differences in the gravitational force between the earth and the moon
two mechanical waves can occupy the same space at the same time because waves are...
displacements of matter
When two billiard balls collide the collision is ________
elastic
In alpha decay the mass # of atom before decay is...
equal to the sum of the mass numbers of the products
number of cycles or vibrations per unit of time
frequency ( SI Unit is (Hz))
The degree to which an object attracts other objects is measured by the objects _________.
gravitational mass
simple longitudinal wave can be expressed as a ...
sine wave
motion of disturbance is...
wave
torque
a force that causes rotation around an axis
Radioactive materials have unstable ...
nuclei
audible sound waves
sound waves that average human can hear
ultrasonic waves
sound waves with frequencies above 20,000Hz ( can produce images )
infrasonic waves
sound waves with frequencies below 20hz
Examples of centripetal force
tension friction gravity
Why does an astronaut weigh less on the moon?
the gravitational field strength is less on Moon then Earth
when two people of different masses push off each other ....
their momenta are equal but opposite
The gravitational force when one of masses is doubled is ________
x4
The gravitational force when both of masses are doubled is ________
x6
The process of nuclear change in an atom of radioactive material is ...
Nuclear Decay
Centripetal acceleration
acceleration toward the center of a circle by an object moving along a circular path and at a constant speed. (change in direction)
in a two body collision momentum is _______
always conserved
the maximum displacement from the equilibrium is the...
amplitude (SI Units is (rad) and (m))
In an inelastic collision between two objects with un equal mass the momentum of one object is .....
increased by the amount that the momentum of the other is decreased
What causes passengers in a car to move when a car turns?
inertia
When a ball is whirled on a string and the string breaks, what causes the ball to move off in a straight line?
inertia
Doppler effect
is an observed change in frequency when there is relative motion between the source of waves and an observer
Sound waves are...
longitudinal
At maximum displacement
mass acceleration is maximum and speed is zero
At equilibrium ...
mass acceleration is zero and speed is maximum
fission chain reaction slowed by...
materials that will absorb some of the neutrons
waves that require a medium through which to travel are...
mechanical waves
physical environment through which a disturbance can travel is...
medium
speed of sound depends on the...
medium and temperature of medium
the impulse experienced by a body is equivalent to the body's change in ___________
momentum
Tangential acceleration
object in circular motion and an acceleration of an object due to CHANGE IN SPEED.
tangential speed
object in circular motion is the objects speed along an imaginary line drawn tangent to the circular path.
When two objects stick together and move with a common velocity after colliding the collision is__________
perfectly inelastic
time it takes a complete cycle to occur
period ( SI Unit is (s))
Rays
radial lines perpendicular to the wave fronts
troughs correspond to
rarefactions
waves arriving at a fixed boundary are ...
reflected and inverted
compression
region of longitudinal wave where density and pressure are maximum
rarefaction
region of longitudinal wave where density and pressure are minimum
When a nucleus undergoes nuclear decay by gamma rays, the atomic # of the element...
remains the same
half life
time required for half a sample of radioactive nuclei to decay
law of conservation of momentum
total momentum of all objects interacting with one another remains constant regardless of the nature of the forces between the ovjects
elastic collision
two objects collide and return to their original form with no change in kinetic energy
transverse wave
wave whose particles vibrate perpendicularly to direction of wave motion
resonance
when the frequency of of a force applied to a system matches the natural frequency of vibration of the system resulting in large amplitude of vibration