2. A 200-kg boulder has 39,200 joules of gravitational potential energy. What height is it at?
3. A 1-kg model airplane has 12.5 joules of kinetic energy and 98 joules of gravitational potential energy. What is its speed? What is its height?
As per the first question we have to calculate the height at which the boulder is present.
we have been given the mass of the boulder [m] as 200 kg.
The gravitational potential energy is given as 39,000 Joule.
The gravitational potential energy at a height ' h' from the surface earth is given as P.E= mass×height×acceleration due to gravity
The value of g=9.8 m/s^2
Hence height [h][tex]=\frac{P.E}{mg}[/tex]
=[tex]\frac{39000}{200*9.8} metre[/tex]
=19.8979 metre
As per the second question we have to calculate the sped and height of the model airplane.
the mass of model airplane is 1 kg
The kinetic energy [K.E] of the airplane is 12.5 joule
we have K.E[tex]=\frac{1}{2} mass*speed^2[/tex]
K.E[tex]=\frac{1}{2}mv^2[/tex]
[tex]v^2=\frac{2K.E }{m}[/tex]
[tex]v^2=\frac{2*12.5}{1}[/tex]
[tex]v=\sqrt{25}[/tex]
v=5 m/s
Again we have to calculate the height [h]
The potential energy is given as 98 Joule.
we know that P.E= mgh
tex]h=\frac{P.E}{mg}[/tex]
=[tex]\frac{98}{1*9.8} metre[/tex]
=10 metre
Match the terms
Term Definition
Chromosphere A) Layer of the sun where energy is transferred by thermal conduction.
Photosphere B) Contains the sun's outer shell from which light energy is radiated.
Radiative zone C) Layer of the sun that is known for its red color and can only be seen during eclipses
Corona D) The plasma that surrounds the sun
Explanation :
(1) Chromosphere: It is a layer above the photosphere. The temperature in chromosphere increases from [tex]6000^0\ C[/tex] to [tex]20,000^0\ C[/tex]. This layer is known for its red color and can only be seen during eclipses.
(2) Photosphere: It is the outer layer of the star which contains sun's outer shell from which light energy is radiated.
(3) Radiative zone: it is a layer of sun where energy is transmitted towards via radiative diffusion or conduction.
(4) Corona: It is a plasma that surrounds the sun and the other stars.
Hence, this is the required definitions.
Answer:bdca
Explanation:
The current in an electron beam in a cathode ray tube is 7.0 X 10^-5 A. A beam of electrons is aimed at a screen. How much charge hits the screen in 5.0S?
A- 2.8X10^3 C
B-5.6X10^-2 C
C-3.5X10^-4 C
D-5.3X10^-6 C
Give an example to explain that motion is relative in nature
on Earth, how many grams of mass does it take to produce a force of 1 newton?
A plane takes off in san francisco at noon and flies toward the southeast. an hour later, it is 400 kilometers east and 300 kilometers south of its starting location. assuming the plane flew in a straight line, how far did it travel? how many degrees south of east did the plane fly?
If you shook the end of a rope up and down 5 times each second, what would be the period of the waves set up in the rope?
Final answer:
Shaking the rope at 5 times per second sets up waves with a frequency of 5 Hz. The period of these waves, which is the inverse of frequency, would be 0.2 seconds.
Explanation:
When you shake the end of a rope up and down 5 times each second, you are creating waves with a certain frequency. The frequency is the number of complete waves that pass a given point in one second, and it is measured in hertz (Hz). Since you're shaking the rope 5 times per second, the frequency of the waves set up in the rope is 5 Hz.
The period of a wave is the time it takes for one complete wave cycle to pass a point. It is the inverse of the frequency. To calculate the period (T), you would use the formula:
T = 1 / f, where 'f' is the frequency.
So in this case:
T = 1 / 5 Hz = 0.2 seconds.
Therefore, the period of the waves set up in the rope is 0.2 seconds.
One’s behavior cannot be affected by one’s subconscious
That statement is false
Our subconscious tend to give a strong influence to our behaviours even if we are not feeling it directly.
For example, let's say that there is a boy that hurt by cats and it's ingrained in his head that cats possess high level of danger to him. Even after that boy grow up, his subsconcious would most likely cause a certain level of paranoia that make him either scared of cats or simply annoyed by seeing them.
Answer:
False is the correct answer
Explanation:
Peace and Love
Compare the functions of nervous signal transmission and endocrine transmissions-
What is the angle between a light ray and its wavefront?
If an object 70 millimeters high is placed 40 millimeters from a converging lens and the image is formed 120 millimeters in front of the lens on the same side as the object, what’s the height of the image?
Which of the following refers to a combination of substances in which the components are evenly mixed?
A. Heterogeneous mixture
B. Ion
C. Compound
D. Homogeneous mixture
APEX!!! PLEADE HELP!!!!
A 60 kg man is moving at 2 m/s. What is his kinetic energy?
A. 240j
B. 120j
C. 60j
D. 30j
Lena would like to be able to know her exact location on a map as she travels across the country. Which technology would best help Lena?
Does a physicist studies cells and life cycles?
Final answer:
Physicists may delve into biological concepts through biophysics, but the study of cells and life cycles is principally a field within biology, focused on by cell biologists.
Explanation:
No, A physicist primarily studies the fundamental principles governing the universe, such as energy, force, and matter. While physics does impact biological systems by explaining behaviors of molecules in cells or assisting in the creation of medical technology, the study of cells and life cycles specifically falls within the realm of biology.
Cell biology is a branch of biology focusing on the study of cellular structures and functions and is fundamentally concerned with the life cycle of cells. Physicists may contribute to this field through biophysics or biomedical applications, such as using physics principles to describe properties of cell membranes or developing diagnostic tools like MRI machines. However, the everyday work of studying cells and their life cycles is typically performed by biologists rather than physicists.
Both lead and zinc are formed as precipitates. Which of these is a step in the formation of the minerals?
elements combine at high pressure
magma cools after a volcanic eruption
atoms combine in water to form solids
materials break up due to rise in temperature
Final answer:
Lead and zinc minerals commonly form as precipitates from hot underground water cooling and depositing solid minerals. They can also form from the cooling and crystallization of magma, particularly in the presence of hydrothermal fluids.
Explanation:
Lead and zinc minerals can form through several geological processes, and one of the key methods for their formation is through the precipitation of minerals from an aqueous (water) solution. When hot underground water that has been heated by magma cools as it moves through the Earth's crust, it can deposit solid minerals. This happens because the solubility of substances often decreases as the temperature drops, leading to the formation of solids from the previously dissolved elements or compounds.
Additionally, minerals can form when magma cools after a volcanic eruption or during more gradual processes. If magma cools slowly, the minerals have time to form large, identifiable crystals. Conversely, rapid cooling leads to the formation of small crystals or even glassy textures without discernible crystals.
Hydrothermal mineral deposits are another significant source of minerals, such as lead and zinc. These deposits form when super heated water from magma chambers dissolves minerals, and as the solution cools and travels towards the surface, the dissolved minerals precipitate out, often forming rich ore bodies.
A 0.025m radius toy top is spinning at a rate of 150rpm, what is the angular velocity? What is the linear velocity of the paint on the outside edge?
Newton concluded that some force had to act on the moon because
Newton concluded that some force had to act on the moon because it is constantly accelerating towards Earth.
Without such a force, according to Newton's First Law, the Moon would continue in a straight path instead of orbiting the Earth. In 1666, he recognized that this centripetal force was necessary to maintain the Moon's circular path. He also theorized that the gravitational force must be proportional to the masses of the Earth and the Moon and that it follows an inverse-square relationship with distance.
Newton's insight was that the same force that causes an apple to fall to the ground also keeps the Moon in orbit around the Earth. This led him to deduce the Law of Universal Gravitation. According to Newton's Second Law, the moon's acceleration towards Earth indicated a centripetal force, which he later defined in his Principia using his laws of motion and the newly formulated concept of gravitational force.
Furthermore, Newton discovered that the gravitational force between any two bodies not only follows the Universal Law of Gravitation but also forms an action-reaction pair, satisfying his Third Law of Motion. This was a crucial realization for Newton to fully explain the motion of the planets and the gravitational pull between the Earth and the Moon.
explain the role that the ant and the acacia tree play in their symbiotic relationships
The mechanical advantage of a machine is always greater than 1. true or false
Final answer:
The statement is false; the mechanical advantage of a machine is not always greater than 1. It is the ratio of the output force to the input force and can be less than 1 in machines like third-class levers. However, machines like hydraulic systems with a wider output plunger can have a mechanical advantage greater than 1.
Explanation:
The statement that the mechanical advantage of a machine is always greater than 1 is false. The mechanical advantage (M.A.) is the number of times the input force is multiplied by a machine to achieve a greater output force. It's determined by the ratio of the output force to the input force.
In certain simple machines like levers, the mechanical advantage can indeed be less than 1. For example, in a third-class lever, where the effort arm is shorter than the load arm, the user must apply more effort than the load. This results in a mechanical advantage of less than 1. On the other hand, when discussing hydraulic systems, if the output plunger is wider than the input plunger, the mechanical advantage is greater than 1 as the output force is bigger than the input force.
The efficiency of a machine, which is the ratio of output work to input work, is always less than 100 percent due to energy losses such as friction, which converts some of the work into heat. This is a separate but related concept reflecting the loss of useful work when operating a machine.
In conclusion, while many tools and machines are designed to give us a mechanical advantage, this advantage can either be greater or less than 1, depending on the design and function of the machine.
a water-balloon launcher with mass 4 kg fires a 0.5 kg balloon with a velocity of 3 m/s to the east. what is the recoil velocity of the launcher?
An electron is released from rest and travels over a potential difference of 2500 v. what is its final velocity?
A college student holds a pail full of water by the handle and whirls it around in a vertical circle at a constant speed. the radius of this circle is 0.95 m. what is the minimum speed that the pail must have at the top of its circular motion if the water is not to spill out of the upside-down pail
A sound wave is moving with a frequency of 700 Hz. What is the period of this sound wave?
700 s
1/700 s
1/700 Hz
70 s
Answer:
1/700s
Explanation:
took test
Which are examples of projectile motion? Check all that apply. a kicker punting a football a car traveling along a highway a free throw in basketball a ball rolling downhill a person throwing darts
A kicker punting a football, a free throw in basketball and a person throwing darts are some examples of projectile motion.
What is a projectile motion?It is the movement of any item or material when it is launched from the planet's surface and takes any curving course while being affected by the pull of gravity of the planet.
This movement style The only force affecting our objects is gravity. Different projectile kinds are available.
A football is thrown upward, being kicked and imparting speed at an angle from the horizontal, or just being dropped and allowed to fall independently are all examples of the initial velocity.
Thus, a kicker punting a football, a free throw in basketball and a person throwing darts are some examples of projectile motion.
Learn more about projectile motion from here,
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A flea jumps straight up to a maximum height of 0.540 m . what is its initial velocity v0 as it leaves the ground?
Why does the plot show vertical jumps at the melting and boiling points?
an example of a Destructive force is the formation of mountains True or False?
A 150 kg hoop rolls along a horizontal floor so that the hoop's center of mass has a speed of 0.130 m/s. how much work must be done on the hoop to stop it?
Which of the following processes requires a physical medium (a solid, liquid, or gas) to transfer thermal energy from one object to another?
I. conduction
II. convection
III. radiation
A. I and III only
B.I and II only
C. III only
D. II only
E. none of these require a physical medium to transfer thermal energy.
Conduction and convection require a physical medium (a solid, liquid, or
gas) to transfer thermal energy from one object to another.
Conduction is the process of heat transfer that takes place in solids.
Thermal energy is usually transferred from hotter surfaces to colder ones in
order to ensure equilibrium is reached
Convection is also similar to conduction but involves heat transfer in fluids
such as water. Radiation on the other hand doesn't require a physical
medium as it exists through a vacuum. This makes option B the most
appropriate choice.
Read more about heat transfer on https://brainly.com/question/16055406