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fgiga [73]
2 years ago
9

What must the minimum tension of a single?

Physics
1 answer:
frozen [14]2 years ago
6 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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cricket20 [7]

Answer:

100 iPods

Explanation:

The deciBell scale is logarithmic, and thus, it turns multiplying into adding.

Initially, it was the Bell scale, purely logarithmic, where "times 10" is translated into "plus 1" (just like normal logs). However, the steps became too big and so they divided the Bell in 10 parts, the deciBell.

The levels above could well have been called 10B and 12B.

Usually, we define the dB scale for intensity as:

I(dB) = 10•log(I)

Thus,

I = 10^(I(dB)/10)

Now 120 dB gives us units of I = 10^(120/10) = 10^12 Pa (assume the dB are measured to 1 Pa) and 100 dB is 10^10 Pa.

Thus, we would need 100 ipods to get the same intensity

8 0
3 years ago
What must the condition of the alveoli be in order for gas exchange to occur
aliya0001 [1]

Answer:

There are 5 main conditions of the alveoli for proper gaseous exchange to in the lungs.

Explanation

Alveoli is found in the lungs of mammals, birds and reptiles. It is the part of the lungs where gaseous exchange really occurs.

Alveoli has a shape of that of balloon but indeed smaller than the real balloon. It allows the passage of oxygen and carbon dioxide

The five main conditions includes:

  1. The Alveoli must have large surface to volume ratio which increase the gases that could be exchanged
  2. The wall must be thin. This can shorten diffusion distance.
  3. Alveoli must be very moist so that oxygen and carbon dioxide can pass through the solution
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3 years ago
An unfortunate 18 kg monkey falls from a 40 m tall tree. What is the monkeys final velocity just befor he impacts the ground.? a
zalisa [80]
The correct answer is c) 28 m/s.
Let's find the step-by-step solution. The motion of the monkey is an uniformly accelerated motion, with acceleration equal to g=9.81 m/s^2. The initial velocity of the monkey is zero, while the distance covered is S=40 m. Therefore, we can use the following relationship to find vf, the final velocity of the monkey:
2aS=v_f^2-v_i^2=v_f^2
from which
v_f= \sqrt{2aS}= \sqrt{2\cdot 9.81 m/s^2 \cdot 40 m}=28 m/s
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2 years ago
The school bag of four students A,B,C,D measures 9kg, 2800gm, 2kg and 8000gm respectively. Whose bag is the lightest
inna [77]

Answer:

Student C

Explanation:

order from heaviest to lightest is...

9 kg (A) , 8000g (8 kg) (D) , 2800g (2.8kg) (B), 2 kg (C)

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What gas law applies to the situation you have described above. Why?
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If you give us the situation described then I'll be able to help.

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