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physics final
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Gravity
Terms in this set (26)
suppose that a car traveling to the east (+-x direction) begins to slow down as it approaches a traffic light. Which statement concerning its acceleration must be true
its acceleration is in the -x direction
when a ball is thrown straight up with no air resistance, the acceleration at its highest point is
downward
if a vector A has components Ax > 0 and Ay < 0, then the angle that this vector makes with the positive x axis must be in this range
270-360
for general projectile motion with no air resistance, the horizontal component of a projectiles velocity
terminates a non-zero constant
if a satellite moves with constant speed in perfectly..?
inward toward earth
a block of mass sits at rest on a rough inclined ramp that makes an angle theta with the horizontal. What must be true about force of static friction on the block
f = mgcos(theta)
an object is moving with constant non-zero velocity. Which of the following statements about it must be true
the net force of the object is zero
a bucket is being lowered by a very light rope with a constant downward velocity. the tension in the rope must be
equal to the weight of the bucket
an object of mass (m) rests on a flat table. the earth pulls on this object with a force of magnitude mg. what is the reaction force to the pull
the object pulling upward on the earth with force mg
when a car goes around a circular curve on a horizontal road at constant speed, what force causes it to follow its circular path
the friction force from the road
two children on a merry-go-round. joe is at a greater distance from the axis of rotation than Jacques. which of the following is true
they both have the same angular speed
it which case is the torque about the pivot due to this face the greatest
picture one
a 50 cm^3 block of wood is floating on water, and a 50 cm^3 chunk of iron is totally submerged in the water. which one has the greater buoyant force on it?
the iron
salt water is denser than fresh. a ship floats in both fresh and salt water. compared to the fresh water, the volume of water displaced in the salt water is
less
if we double the frequency of a system undergoing simple harmonic motion, which of the following about the system are true
the period is reduced to one half of what it is
an object attached to an ideal spring excites simple harmonic motion. if you want to double its total energy you could
double the force constant of the spring
an object is attached to a vertical spring and bobs up and down between points A and B. where is the object located when its kinetic energy is a minimum
at either a or b
two simple pendulums, a and b are each 3.0m long and the period of pendulum a is T. Pendulum a is twice as heavy as pendulum B. what is the period of pendulum b
T
which of the following are the units of momentum
kg m/s
person x pushes twice as hard against a stationary brick wall as person y. which one of the following is correct
both do zero work
if the force on an object is in the negative direction, the work it does on the object must be
the work could be negative or positive, depending on the direction the object moves
a stone is held at a height above the ground. a second stone with four times the mass of the first held at the same height. the gravitational potential energy of the second stone compared to the first is
four times as much
which one has larger kinetic energy, a 500 kg object moving at 40m/s or a 1000kg object moving at 20m/s
the 500 object
a truck has three times the mass of a car and is moving with twice the speed of the car. if Kt and Kc referring to kinetic energies of truck and car respectively it Is correct to say that
Kt=Kc
in an inelastic collision involving an isolated system, the final total momentum is
exactly the same as the initial momentum
if you wanted to know much the temp of a particular piece of material would rise when a known amount of heat was added to it, which of the following quantities would be most helpful to know
specific heat
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