Connexus Physics pre-ap semester A final exam, all correct answers. And y’all better be freaking grateful, because it took a long time to type all this out.
<span>1)
</span>In the steps of the scientific method…
A. Interpreting results
<span>2)
</span>The radius of the Earth is…
B. 6.37 x 10^3 km
<span>3)
</span>Which of the following equations best describes…
D. y = 1/2x
<span>4)
</span>In the graph, what is the correct description…
C. Negative position
<span>5)
</span>The motion of a ball on an inclined plane is
described…
C. vi
<span>6)
</span>Acceleration due to gravity is also called
C. free-fall acceleration
<span>7)
</span>Which of the following is a physical quantity…
A. vector
<span>8)
</span>In a coordinate system, a vector is…
A. Cos (theta)
<span>9)
</span>Which of the following is an example of
projectile motion?
B. a thrown baseball
<span>10)
</span>A newton is equivalent to which…
A. kg * m/s^2
<span>11)
</span>In the free-body diagram shown below, which of
the following…
C. 4050 N
<span>12)
</span>A net force of 6.8 N accelerates a 31 kg scooter…
A. 0.22 m/s^2
<span>13)
</span>A change in the gravitational force acting…
C. Weight
<span>14)
</span>A passenger on a bus moving east sees a man
standing on a curb…
C. move west at a speed that is equal to the bus’s speed.
<span>15)
</span>In which of the following scenarios is no net
work done?
B. A car travels at a constant speed on a flat road.
<span>16)
</span>What is the kinetic energy of a 0.135 kg baseball
thrown at 40.0 m/s?
C. 108 J
<span>17)
</span>Which of the following refers to the sum of
kinetic energy…
D. mechanical energy
<span>18)
</span>Which of the following are not units of power?
B. J
<span>19)
</span>Which of the following…can be used to…calculate…change
in…momentum?
D. (delta)p = F (delta) t
<span>20)
</span>Two skaters stand facing…
B. their momenta are equal but opposite.
<span>21)
</span>In an inelastic collision…
D. the momentum of one object will increase by the amount that the momentum of
the other object decreases.
<span>22)
</span>When an object is moving with uniform circular
motion…tangential speed
C. is constant
<span>23)
</span>Which units would be the most appropriate to use
to…
A. newtons
<span>24)
</span>How would the speed of Earth’s orbit around the
sun change…
A. The speed would not change
<span>25)
</span>A girl pushes a box that has a weight of 450 N
up an incline…force of 150 N along…
B. 3.0
<span>26)
</span>According to the law of conservation of
mechanical energy,
C. Total energy must remain the same
<span>27)
</span>The potential energy of a 60 kg man…balcony 43
meters…
A. 25000 J
<span>28)
</span>If two small beakers of water, one at 70C and
one at 80C…
C. The final temperature is between 70C and 80C
<span>29)
</span>Why does sandpaper get hot when it is rubbed
against rusty metal?
C. Friction between the sandpaper and metal…
<span>30)
</span>Which of the following describes a substance in
which the temperature and pressure…
D. substance undergoing a change of state
<span>31)
</span>An ideal gas system is maintained at a constant
volume of 4 L. If pressure is constant…
A. 0 J
<span>32)
</span>Which of the following is a thermodynamic
process in which a system…
C. a cyclic process
<span>33)
</span>When a drop of ink mixes with water…
A The system’s entropy increases, and the total entropy of the universe
increases.
<span>34)
</span>A mass-spring system can oscillate…
D. elastic potential
<span>35)
</span>If a semi-truck decrease its speed from 10 m/s
to 5 m/s...
D. ¼ its old kinetic energy
<span>36)
</span>A boy releases a small 1 kg toy truck from rest
down a 5 meter high hill…
B. 50 J
<span>37)
</span>A car accelerates uniformly from 10 m/s to 20
m/s in 4.2 seconds…
A. 2.4 m/s^2
<span>38)
</span>What must the minimum tension of a single
vertical wire be to support a 1.5 kg picture?
A. 15 N
<span>39)
</span>Why does it seem harder to start sliding a couch across a carpeted floor than…
C. The opposing force of friction is greater when an object starts from rest…
<span>40)
</span>An elevator weighing 2.00 c 10^5 N is supported
by a steel cable…
Fw = mass * gravitational acceleration
2*10^5 = mass * 9.8
mass of the elevator = 20.4*10^3 kg
Fnet = Tension – Fw
mass * acceleration = Tension – 2*10^5
20.4*10^3 * 3 = Tension – 2*10^5
61200 = Tension – 2*10^5
Tension = (61200) + (2*10^5)
Tension = 2.61 * 10^5 newton
<span>41)
</span>A bullet with a mass of 6.00 g is fired through
a 1.25 kg block of wood on a frictionless surface.
0.006(896) + 0 = 0.006(435) + 1.25(V)
5.376 + 0 = 2.61 + 1.25(V)
5.376 = 2.61 + 1.25(V)
2.766 = 1.25(V)
V = 2.21 m/s
<span>42)
</span>Find the final equilibrium temperature when 10.0
g of milk at 10.0C is added to 1.60 x 10^2 g of coffee with a temperature of
90.0C.
Heat lost = heat gained
X = equilibrium temperature
Heat lost = 160(90-x)
Heat gained = 10(x-10)
14400 – 160x = 10x -100
170x = 14500
X = 14500/170
X = 85.25 degrees