This site is 100% ad supported. Please add an exception to adblock for this site.

Physics 1st Semester

Terms

undefined, object
copy deck
What is true about completely submerged objects resting on the ocean bottom?
The apparent weight of the object depends on the object\'s density.
What does the net force between two levels in a fluid equal?
The weight of the fluid between the levels
What does the difference between gauge pressure and absolute pressure equal?
The pressure at the surface of the fluid.
If an object is only partially submerged in a fluid, what is true about it\'s density?
The density of the fluid is greater than the density of the object.
True or False, there is no physical experiment we can do inside a secluded room to determine our state of accelerated motion.
False
When you approach a light source, the wavelength of emitted light appears______.
shorter
True or false, a postulate of special relativity says that the speed of light in empty space depends on the motion of the source or of the observer
False
A ball is whirled on a string, then the string breaks. What causes the ball to move off in a straight line?
inertia
If you cannot exert enough force to loosen a bolt with a wrench, what should you do?
Use a wrench with a longer handle.
What is happening when an astronaut in orbit experiences apparent weightlessness?
The net gravitational force on the astronaut is not balanced by a normal force.
What remains constant for a satellite in an elliptical orbit?
it\'s total energy
Tides are caused by __________.
Differences in the gravitational force of the moon at different points on Earth.
When an object is moving with uniform circular motion, the object\'s tangential speed is____.
constant
A solar eclipse happens when ______.
the moon is between Earth and the sun.
The gravitational force between two masses is 36N. What is the gravitational force if the distance between them is tripled? (G= 6.673x10^-11)
4.0N
The change in an object\'s momentum is equal to...
The product of the force applied to the object and the time interval.
If the displacement of a horizontal mass-spring system was doubled, the elastic potential energy in the system would change by a factor of...
4
What formula would be used to directly calculate the kinetic energy of an object with mass bouncing up and down on a spring with the spring constant k?
KE= 1/2mv^2
Gravitational potential energy is always measured in relation to...
A zero level
A 0.2 baseball is pitched with a velocity of 40 m/s and is then batted to the pitcher with a velocity of 60 m/s. What is the magnitude of change in the ball\'s momentum?
20 kg per m/s
Which form of energy is involved in weighing fruit on a spring scale>
elastic potential energy
A horizontal force of 200 N is applied to move a 55kg television set across a 10 m level surface. What is the work done by the 200 N force on the television set?
2000 J
A sled weighing 1.0x10^2 is held in place on a frictionless 20 degree slope b a rope attached to a stake at the top. The rope in parallel to the slope. What is the normal force of the slope acting on the sled?
94 N
Ball A has triple the mass and speed of ball B. What is the ratio of kinetic energy of ball A to ball B?
27
Multiplying or dividing vectors by scalars results in
Vectors
A lack of precision in scientific measurements typically arises from
Limitations of the measuring instrument.
On earth the force of gravity on 1.0 slug is...
32.2 lbs
A Newton is closest to:
.25 lbs
As a basketball player starts to jump for a rebound, the player begins to move upward faster and faster until his shoes leave the floor. At the moment the player begins to jump, the force of the floor on the shoes is...
greater than the player\'s weight.
Which are simultaneous equal but opposite forces resulting from the interaction of two objects?
action-reaction pairs
A car goes forward along a level road at constant velocity. The additional force needed to bring the car into equilibrium is...
zero
A late traveler rushes to catch a plane, pulling a suitcase with a force directed 30 degrees above the horizontal. If the horizontal component of the force on the suitcase is 60.6 N, what is the force exerted on the handle?
70.0 N
What statement about the acceleration of an object is true?
The acceleration of an object is directly proportional to the net external force acting on the object and inversely proportional to the mass of the object.
As an object falls toward Earth...
The upward acceleration of Earth is negligible because of its large mass.
The statement by Newton that for every action there is an equal but opposite reaction is which of his laws of motion?
3rd
The horizontal component of a ball\'s velocity at the first point in it\'s parabolic path is...
equal to the horizontal component of it\'s initial velocity.
In a coordinate system, a vector is oriented at angle theta with respect to the x-axis. The x component of the vector equals the vector\'s magnitude multiplied by which trigonometric function?
cos theta
What two dimensions, in addition to mass, are commonly used by physicists to derive additional measurements?
Length and time
Two students are standing on a fire escape, one twice as high as the other. Simultaneously, each drops a ball. If the first ball strikes the ground at time t1, when will the second ball strike the ground?
Square root of 2 times t1.
What expression has the same dimensions as an expression yielding a value for acceleration? (m/s^2)?
(change in v)^2/change in distance
What situation represents a negative displacement?
A cat jumps from a tree limb to the ground.
Acceleration is defined as...
the rate of change of velocity.
When a cars velocity is negative and it\'s acceleration is negative, what is happening to the car\'s motion?
The car speeds up.

Deck Info

43

stargazer00742

permalink