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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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The friction force between the box and the incline if the box does not slide down the incline will be 0.577

The force preventing sliding against one another of solid surfaces, fluid layers, and material components is known as friction. There are several kinds of friction: Two solid surfaces in touch are opposed to one another's relative lateral motion by dry friction.

Given the box resting on the inclined plane above has a mass of 20kg and the The incline sits at a 30 degree angle

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Since the frictional force F₁ must equal or exceed gravitational force F₂ down the incline:

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