Are the objects described here in static equilibrium, dynamic equilibrium, or not in equilibrium at all? a. A girder is lifted at constant speed by a crane.
b. A girder is lowered by a crane. It is slowing down.
c. You're straining to hold a 200 lb barbell over your head.
d. A jet plane has reached its cruising speed and altitude.
e. A rock is falling into the Grand Canyon.
f. A box in the back of a truck doesn't slide as the truck stops.

Answers

Answer 1

Answer:

Answer:

a) dynamic equilibrium; b) No equilibrium; c) Static equilibrium; d) Dynamic equilibrium; e) Not equilibrium; f) Dynamic equilibrium.

Explanation:

a) In this case, the girder is in dynamic equilibrium, although there is movement it is realized at constant speed therefore there is no acceleration and the sum of forces is equal to zero.

b) There is no equilibrium since the velocity is decreasing it slows the girder, therefore the sum of forces will be equal to the product of mass by acceleration according to newton's second law.

c) In this case, the arms of the person are exercising each 100 lb, in order to keep the barbell stable, this allows the static equilibrium.

d) There is movement but however the jet will move at constant speed without any kind of acceleration, therefore it has a condition of dynamic equilibrium.

e) There is no balance as the rock falls and the acceleration due to gravity causes its speed to increase as it goes down.

f) In this case there is dynamic equilibrium as there was a deceleration movement however this force value given by the deceleration multiplied by the mass is not large enough to be able to move the box, due to the weight of the box plus the friction force between the box and the surface.

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A graph of the motion of a pendulum shows that it swings from +5 centimeters to -5 centimeters for each cycle. What is the amplitude of the pendulum?

Answers

The amplitude of the pendulum is 5cm.

What is the amplitude?

Amplitude is the maximum displacement of the wave from its mean position upwards or downwards.

As the graph of the motion of pendulum swings from +5cm to -5cm for each cycle, the magnitude of peak amplitude of the pendulum is 5 centimeters.

Learn about amplitude.

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the peak amplitude of the pendulum is 5 centimeters, the peak to peak amplitude of the pendulum is 10 centimeters.

in this case, i think peak to peak amplitude makes more sense

what will be temperature on the kelvin scale if the indicated temperature on the Fahrenheit scale is 200degree Fahrenheit

Answers

We can use Kelvin = 5/9 (Fahrenheit - 32) + 273.15

K = 5/9(168) + 273.15

K = (93 and 1/3) + 273.15

K = 366.48 (rounded)

kelvin=366.38(approximately)

Which of the following does not represent a mechanical wave?sound
waves in the ocean
waves in a wheat field
light

Answers

The example that does not represent a mechanical wave is light. A mechanical wave requires a medium in order for it to travel and propagate. Examples of such is sound waves that travel through the air or ocean. Light is an electromagnetic wave because it makes use of particles called photons to propagate.

Which of the following does not represent a mechanical wave?

light

1. Can someone help me with this? :) Which object is made of frozen gas, ice, and dust that orbits in the outermost reaches of the solar system?1) planet
2) moon
3) Kuiper Belt object
4) meteor

2. Which explanation of the solar system best fits the observations of the planets and how they orbit the sun?
1) A comet hit the sun and sent off fragments that became the planets.
2) The gravity of a large, massive star passing the sun ripped off blobs of material from it that formed the planets.
3) The planets formed at the center of a collapsing spinning cloud of gas and dust.
4) The sun and planets formed from a collapsing spinning cloud of gas and dust.

Answers

1. Kuiper Belt object is made of frozen is made of frozen gas, ice, and dust that orbits in the outermost reaches of the solar system. Kuiper belt is a region which is filled with icy gaz bodies. Its structure is almost the same as the asteroid belt between Mars and Jupiter. Pluto, Makemake, Haumea are the officially recognized planets which are located in this region. 2. In my opinion, the most suitable option is: 3) The planets formed at the center of a collapsing spinning cloud of gas and dust. According to theory of solar system formation, the solar system appeared after a supernova (star explosion). A cloud of gas and dust was collapsed, and it caused a formation of a solar nebula.

Answer:

1: C. Kuiper Belt object

2: D. The sun and planets formed from a collapsing spinning cloud of gas and dust.

Explanation:

I just took the test!!!

A parallel-plate air capacitor is made from two plates 0.210 m square, spaced 0.815 cm apart. it is connected to a 120 v battery. if the plates are pulled apart to a separation of 1.63 cm , suppose the battery remains connected while the plates are pulled apart. part a what is the capacitance?