Description
QUESTION 1
-
If a flower is 6.5 cm wide, its width expressed in millimeters is
x
mm, where
x
isless than 6.5.greater than 6.5.
3.125 points
QUESTION 2
- How many nanoseconds does it take for a computer to perform one calculation if it performs 3.8×107 calculations per second?65 ns38 ns11 ns26 ns
3.125 points
QUESTION 3
-
The wavelength of a certain laser is 0.21 micrometers, where 1 micrometer = 1×10-6 m. ?Express this wavelength in nanometers.2.1
?
104 nm2.1
?
102 nm2.1
?
101 nm2.1
?
103 nm
3.125 points
QUESTION 4
- In addition to 1 m = 39.37 in., the following exact conversion equivalents are given: 1 mile = 5280 ft, 1 ft = 12 in, ?1 hour = 60 min, and 1 min = 60 s. If a particle has a velocity of 4.6 miles per hour,its velocity, in m/s, is closest to2.1 m/s.2.3 m/s.1.9 m/s.2.5 m/s.1.6 m/s.
3.125 points
QUESTION 5
-
The motions of a car and a truck along a straight road are represented by the velocity-time graphs in the figure. The two vehicles are initially alongside each other at time
t
= 0. At time
T
, what is true about these two vehicles since time
t
= 0?
The truck will have traveled further than the car.The car will have traveled further than the truck.The car will be traveling faster than the truck.The truck and the car will have traveled the same distance.
3.125 points
QUESTION 6
- When can we be certain that the average velocity of an object is always equal to its instantaneous velocity?only when the velocity is constantonly when the acceleration is changing at a constant rateneveronly when the acceleration is constantalways
3.125 points
QUESTION 7
- Suppose that an object is moving with constant nonzero acceleration. Which of the following is an accurate statement concerning its motion?In equal times it moves equal distances.A graph of its position as a function of time has a constant slope.In equal times its velocity changes by equal amounts.In equal times its speed changes by equal amounts.A graph of its velocity as a function of time is a horizontal line.
3.125 points
QUESTION 8
- A test rocket is fired straight up from rest with a net acceleration of 20.0 m/s 2. After 4.00 seconds the motor turns off, but the rocket continues to coast upward with no appreciable air resistance. What maximum elevation does the rocket reach?487 m327 m160 m320 m408 m
3.125 points
QUESTION 9
- A car is 200 m from a stop sign and traveling toward the sign at 40.0 m/s. At this time, the driver suddenly realizes that she must stop the car. If it takes 0.200 s for the driver to apply the brakes, what must be the magnitude of the constant acceleration of the car after the brakes are applied so that the car will come to rest at the stop sign?4.17 m/s22.89 m/s2 3.42 m/s22.08 m/s23.89 m/s2
3.125 points
QUESTION 10
-
A ball is projected upward at time
t
= 0.0 s, from a point on a roof 20 m above the ground. The ball rises, then falls and strikes the ground. The initial velocity of the ball is 42.4 m/s if air resistance is negligible. The time when the ball strikes the ground is closest to8.8 s9.7 s9.4 s8.5 s9.1 s
3.125 points
QUESTION 11
- A dragster starts from rest and travels 1/4 mi in 8.40 s with constant acceleration. What is its velocity when it crosses the finish line?150 mi/h214 mi/h107 mi/h235 mi/h
3.125 points
QUESTION 12
-
If the magnitude of vector
A
is greater than that of vector
B
, under what condition is |
A
–
B
| = ||
A
| – |
B
||?Vectors
A
and
B
are in opposite directions.Vectors
A
and
B
are in the same direction.The statement is never true.Vectors
A
and
B
are in perpendicular directions.The statement is always true.
3.125 points
QUESTION 13
-
Under what condition is |
A
–
B
| = |
A
| + |
B
|?The magnitude of vector
A
is zero.Vectors
A
and
B
are in the same direction.Vectors
A
and
B
are in perpendicular directions.Vectors
A
and
B
are in opposite directions.The statement is never true.
3.125 points
QUESTION 14
- You walk 70 m to the north, then turn 60? to your right and walk another 45m. Determine the direction of your displacement vector. Express your answer as an angle relative to east.54? N of E67? N of E74? N of E60? N of E
3.125 points
QUESTION 15
-
Vectors
A
and
B
are shown in the figure. Vector
C
is given by
C
=
B
–
A
. The magnitude of vector
A
is 16.0 units, and the magnitude of vector
B
is 7.00 units. What is the magnitude of vector
C
?
15.5 units18.7 units16.2 units9.00 units9.53 units
3.125 points
QUESTION 16
- An apple falls from an apple tree growing on a 20? slope. The apple hits the ground with an impact velocity of 10.4 m/s straight downward. What is the component of the apple’s impact velocity parallel to the surface of the slope?3.6 m/s9.8 m/s7.7 m/s5.6 m/s
3.125 points
QUESTION 17
-
The components of vector
B
are
Bx
= -5 and
By
= -2.8, and the components of vector
C
are
Cx
= -4.3 and
Cy
= +3.6. What is the angle (less than 180 degrees) between vectors
B
and
C
?111?69?11?80?169?
3.125 points
QUESTION 18
-
If
A
= +3
i
– 2
j
– 4
k
and
C
= -5
i
– 2
j
– 3
k
, which of the following numbers is
closest
to the magnitude of
A
–
C
?8710119
3.125 points
QUESTION 19
-
Vector
A
= -3.00
i
+ 3.00
j
and vector
B
= 3.00
i
+ 4.00
j
. What is vector
C
=
A
+
B
?0.00
i
+ 7.00
j
-3.00
i
+ 7.00
j
7.00
i
+7.00
j
0.00
i
+3.00
j
-3.00
i
-3.00
j
3.125 points
QUESTION 20
- A pilot drops a package from a plane flying horizontally at a constant speed. Neglecting air resistance, when the package hits the ground the horizontal location of the plane willdepend of the speed of the plane when the package was released.be behind the package.be in front of the package.be over the package.
3.125 points
QUESTION 21
- Alice and Tom dive from an overhang into the lake below. Tom simply drops straight down from the edge, but Alice takes a running start and jumps with an initial horizontal velocity of 25 m/s. Neither person experiences any significant air resistance. Just as they reach the lake belowthe speed of Alice is larger than that of Tom.the splashdown speed of Alice is larger than that of Tom.they will both have the same speed.the speed of Alice will always be 25 m/s larger than that of Tom.the speed of Tom will always be 9.8 m/s larger than that of Alice.
3.125 points
QUESTION 22
-
An object has a position given by
r
(t) = [2.0
m
+ (1.00
m/s
) x t]
i
+ [3.0
m
– (1.00
m/s
2) x t2]
j
, where quantities are in SI units. What is the
speed
of the object at time t = 2.00s?4.12
m/s
2.65
m/s
2.24
m/s
5.00
m/s
2.50
m/s
3.125 points
QUESTION 23
- A plane flying at 70.0 m/s suddenly stalls. If the acceleration during the stall is 9.8 m/s 2 directly downward, the stall lasts 5.0 s, and the plane was originally climbing at 25? to the horizontal, what is the velocity after the stall?66 m/s at 17? below the horizontal80 m/s at 37? above the horizontal80 m/s at 37? below the horizontal66 m/s at 17? above the horizontal
3.125 points
QUESTION 24
- A ball is thrown at a 60.0? angle above the horizontal across level ground. It is thrown from a height of 2.00 m above the ground with a speed of 20.0 m/s and experiences no appreciable air resistance. The time the ball remains in the air before striking the ground is closest to3.53 s.3.07 s.16.2 s.3.64 s.3.32 s.
3.125 points
QUESTION 25
-
An object has a position as a function of time given by
rA
(t) ?= -4.229 (
m/s
) x t
i
+ 8.973 (
m/s
^2) x t2
j
and another object has a position as a function of time given by
rB
(t) = 3.265 (
m/s
^2) x t2
i
+ 8.127 (
m/s
) x t
j
What is the distance between the two objects when t = 3.34(s)?Enter your answer in scientific notation to 3 significant digits followed by a single space and the correct unit.
I’m trying out the functionality of this question type. There will not be a question with a response type like this on the actual exam.
3.125 points
QUESTION 26
- A plane moving 200 m/s horizontally fires a projectile with speed 50 m/s in a forward direction 30.0? below the horizontal. At that instant, what is the speed of the projectile with respect to a stationary observer on the ground?293 m/s268 m/s245 m/s250 m/s
3.125 points
QUESTION 27
-
A cart is moving with a constant horizontal velocity of 5.00 m/s. A small pebble is launched from the front of the cart with a velocity of 8.00 m/s at 60.0? above the horizontal as measured relative to the cart (see figure) and experiences no significant air resistance. Just as the pebble returns to the level from which it was launched, its distance from the front of the cart is closest to
4.60 m.9.19 m.5.66 m.2.83 m.11.3 m.
3.125 points
QUESTION 28
-
An object moves in a circle of radius
R
at constant speed with a period
T
. If you want to change only the period in order to cut the object’s acceleration in half, the new period should be
T
/2.
T
.
T
/4.4
T
.
T
/
.
3.125 points
QUESTION 29
- If an object travels at a constant speed in a circular path, the acceleration of the object islarger in magnitude the smaller the radius of the circle.smaller in magnitude the smaller the radius of the circle.in the opposite direction of the velocity of the object.in the same direction as the velocity of the object.zero.
3.125 points
QUESTION 30
- A ball is tied to the end of a cable of negligible mass. The ball is spun in a circle with a radius 2.00 m making 7.00 revolutions every 10.0 seconds. What is the magnitude of the acceleration of the ball?74.2 m/s267.9 m/s214.8 m/s238.7 m/s229.3 m/s2
3.125 points
QUESTION 31
- A satellite orbits the earth a distance of 1.50 ? 10 7 m above the planet’s surface and takes 8.65 hours for each revolution about the earth. The earth’s radius is 6.38 ? 10 6 m. The acceleration of this satellite is closest to9.80 m/s2.1.91 m/s2.0.870 m/s2.2.72 m/s2.0.0690 m/s2.
3.125 points
QUESTION 32
-
Two particles,
A
and
B
, are in uniform circular motion about a common center. The acceleration of particle
A
is 8.3 times that of particle B. The period of particle B is 2.1 times the period of particle A. The ratio of the radius of the motion of particle A to that of particle B is closest to
r
A/
r
B = 16.
r
A/
r
B = 4.0.
r
A/
r
B = 1.9.
r
A/
r
B = 17.
r
A/
r
B = 0.25.
