# Physics Exam set 1

the speed of light
Today the standard meter is defined in terms of
a standard platnium-iridium cylinder
the standard unit of mass is defined in terms of
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the electromagnetic waves emitted by cesium atoms
the standard unit of time is defined in terms of
10^4 millimeters
Which of the following is the longest length?
10^0 meters
10^2 centimeters
10^4 millimeters
10^5 millimeters
10^7 nanometers
displacement
which of the following is a vector quantity?
mass
temperature
time
displacement
volume
E) scalar quantites can be added together using rules of ordinary addition
Which one of the following is true concerning scalar quantities?
a) scalar quantities must be represented by base units
b)scalar quantities have both magnitude and direction
c)scalar quantites can be added to vector quantities using rules of trigonometry
d) scalar quantities can be added to other scalar quantites using rules of trigonometry
4.45x 10^-2
Which of the following is equivalent to 44.5 mm?
4.45 x 10^1m
4.45 x 10^-2 m
44.5 x 10^-1m
44.5 x 10^-2
4.45 x 10^0 m
121
Which is the correct number of signifigant figures for adding the following together: 3.6,113,4.19?
121
120.8
120.79
1.20 x 10^2
120.8 x 10^3
8.0 x 10^4 cm^2
Which one of the following choices is equal to 8.0 m^2
8.0 x 10^-4 cm^2
8.0 x 10^2 com^2
8.0 x 10^-2 cm^2
8.0 x 10^4 cm^2
8.0 x 10^3 cm^2
10^-6
the ratio 1 mg/1 kg is equal to
152
1.52 x 10^2 is equal to
d) a vector that is zero may have components other than zero
Which one ofthe following statements concerning vectors and scalars is false?
a) in calc the vector components of vector may be used in place of the vector itself
b)it is possible to use vector components that are not perpendicular
c) a scalar component may be either positive or negative
d)a vector that is zero may have components other than zero
e)two vectors are only equal if they have the same magnitude and direction
B) a ball is rolling down an incline plane
Which one of the following situations will the path length equal the magnitude of the displacement?
A) a toy train is traveling around a circular track
b) a ball is rolling down an inclined plane
c)a train travels 5 miles east before it stops, then 2 miles west
d) a ball rises and falls after being thrown straight up from the earth’s surface
e) a ball on the end of a string is moving in a vertical circle
around 340 m/s
if the sound of a siren took 7 seconds to reach a house located 2.4 km away, what is the speed of sound in air? Round to the closest ten
d) the car travels eastward and slows down
when does the car have westward acceleration?
a) the car travels westward at a constant speed
b)the car travels eastward and speeds up
c)the car travels westward and slows down
d) the car travels eastward and slows down
e)the car starts from west and moves toward the east
B) avg speed
Which one of the following is not a vector quantity?
a)acceleration
b)avg speed
c)displacement
d)avg velocity
e)instantaneous velocity
D) a body travels with a constant velocity and a time-varying acceleration
which of the following situations is NOT possible?
a) a body has zero velocity and a non-zero acceleration
b) a body travels with northward velocity and a northward acceleration
c) a body travels with northward velocity and a soouthward acceleration
d) a body travels with a constant velocity and a time-varying acceleration
e) a body travels with a constant accelration and a time-vary velocity
b) the ball is freely falling body for the duration of its flight
a ball is thrown vertically upward from the surface of the earth. the ball rises to some maximum height and falls back to the surface of the earth. which one of the following statements concerning this situation is true if air resistance is neglected?
A) as the ball rises its acceleration vector points upward
B) the ball is a freely falling body for the duration of its flight
c) the acceleration of the ball is zero when the ball is at its highest point
d) the speed of the ball is negative while the ball falls back toward the earth
e) the velocity and acceleration of the ball always point in the same direction
e) the quantity that changes the velocity of an object
complete the following statement: the term net force most accurately describes:
A) the mass of an object
b) the inertia of an object
c) the quantity that causes a displacement
d) the quantity that keeps an object moving
e) the quantity that changes the velocity of an object
b) intertia
Which of the following is used to indicate the natural tendency of an object to remain at rest or in motion at an constant speed along a straight line?
a) velocity
b) inertia
c) acceleration
d) equilibrium
e) force
a) newtons first law of motion is valid
Complete the following statement: an inertial reference frame in which
a) newtons first law of motion is valid
b) the inertias of objects within the frame are zero
c) the frame is accelerating
d) the acceleration due to gravity is greater than zero
e) newton’s second law of motion is not valid
c) the value of G is same everywhere in the universe but the value of g is NOT
Which one of the following statements concerning the two “gravitational constants”( G the universal gravitational constant and g the magnitude of acceleration due to gravity) is true?
a) the values of g and G depend on location
b) the values of g and G do NOT depend on location
c) the value of G is the same everywhere in the universe but the value of g is NOT
d) the values of g is the same everywhere in the universe but the value of G is NOT
e) the values of g and G are equal on the surface of any planet, but in general, G varies with the location in the universe
b) the masses and radii of mars and earth are not the same
Which one of the following statements best explains why the weight of an object mass m is different on mars than it is on earth?
a) the mass of mars is different form that of earth
b) the masses and radii of mars and earth are not the same
c) the mass m is further from eartths center when it is on mars
d) the constant G is different on mars
e) the mass is m is different on mars
c) 3a
A net force (F) is reguired to give an object with mass M an acceleration . If a net force 6F is applied to an object with mass 2m, what is the accleration of this object?
A) a
b) 2a
c)3a
d)4a
e)6a
d) A and B must point in the same direction
if vectors A and B are added together to form vector C (A + B =C ). Which of the following statements is true?
a) A and B must be displacements
b) A and B must have equal lengths
c) A and B must point opposite directions
d) A and B must point in the same direction
e) A and B must be at right angles to each other
e) it could have any value between 2 km and 14 km depending on how they are oriented
A physics student adds two displacement vectors with magnitudes of 8 km and 6 Km. Which statement is true concerning the magnitude of the resultant displacement?
A) it must be 10 km
b) it must be 14 km
c) it could be equal to zero kilometers, depending on the orientation of the vectors
e) it could have any value between 2 km and 14 km depending on how they are oriented
a) a ball rolls with a constant velocity
In which one of the cases is the displacement of the object directly proportional to the elapsed time?
a) a ball rolls with a constant velocity
b) a ball at rest is given a constant acceleration
c) a ball rolling with constant velocity Vo is given a constant acceleration
d) a bead falling through oil experiences a decreasing acceleration
e) a rocket fired from the earth’s surface experiences an increasing acceleration
a) .25kg
When the net force that acts on a hockey puck is 12N, the puck accelerates at a rate of 48m/s^2 . Determine the mass of the puck
a) .25 kg
b) 1kg
c) 5kg
d) 2.5kg
e) 2kg

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