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Zepler [3.9K]
3 years ago
11

The potential energy of a 60 kg man standing on a balcony 43 meters above the ground is:

Physics
2 answers:
oee [108]3 years ago
3 0
Given: Mass m = 60 Kg;         Height h = 43 m

Required: Potential P.E

Formula: P.E = mgh

               P.E = (60 Kg)(9.8 m/s²)(43 m)

               P.E = 25,284 J
ArbitrLikvidat [17]3 years ago
3 0

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





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A 2.0-cm-diameter parallel-plate capacitor with a spacing of 0.50 mm is charged to 200 V. What are (a) the total energy stored i
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Answer:

(A) Total energy will be equal to 0.044\times 10^{-5}J

(b) Energy density will be equal to 0.0175J/m^3

Explanation:

We have given diameter of the plate d = 2 cm = 0.02 m

So area of the plate A=\pi r^2=3.14\times 0.02^2=0.001256m^2

Distance between the plates d = 0.50 mm = 0.50\times 10^{-3}m

Permitivity of free space \epsilon _0=8.85\times 10^{-12}F/m

Potential difference V =200 volt

Capacitance between the plate is equal to C=\frac{\epsilon _0A}{d}=\frac{8.85\times 10^{-12}\times 0.001256}{0.50\times 10^{-3}}=0.022\times 10^{-9}F

(a) Total energy stored in the capacitor is equal to

E=\frac{1}{2}CV^2

E=\frac{1}{2}\times 0.022\times 10^{-9}\times 200^2=0.044\times 10^{-5}J

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V=0.001256\times 0.02=2.512\times 10^{-5}m^3

So energy density =\frac{Energy}{volume}=\frac{0.044\times 10^{-5}}{2.512\times 10^{-5}}=0.0175J/m^3

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In moving out of a dormitory at the end of the semester, a student does 1.82 x 104 J of work. In the process, his internal energ
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Answer:

Explanation:

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(b) internal energy, U = - 4.07 x 10^4 J ( as it decreases)

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Q = W + U

Q = 1.82 x 10^4 - 4.07 x 10^4

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What is the freezing point of an aqueous solution that boils at 101 degrees C? Kfp = 1.86 K/m and Kbp = 0.512 K/m. Enter your an
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Answer:

-3.63 degree Celsius

Explanation:

We are given that

Boiling point of solution=T_b=101^{\circ} C

Boiling point water=100 degree Celsius

K_f=1.86K/m

K_b=0.512 K/m

\Delta T_b=T-T_0

Where T=Boiling point of solution

T_0=Boiling point of pure solvent

\Delta T_b=101-100=1^{\circ}C

\Delta T_b=k_bm

Using the formula

1=0.512\times m

Molality,m=\frac{1}{0.512} m

\Delta T_f=k_fm

Using the formula

\Delta T_f=\frac{1}{0.512}\times 1.86

\Delta T_f=3.63 C

We know that

\Delta T_f=T_0-T_1

Where T_0 =Freezing point of solvent

T_1= Freezing point of solution

Using the formula

3.63=0-T_1

Freezing point of water=0 degree Celsius

T_1=0-3.63=-3.63 C

Hence, the freezing point of solution=-3.63 degree Celsius

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