In the lesson a thermos is presented as an example of an isolated energy system. How could you change the thermos into an open energy system?
Answer:
The lid of the thermos must be removed.
Explanation:
The definition of an open system is one that can exchange heat and mass with the surrounding medium. A closed thermos cannot exchange mass or temperature with the medium. By removing the lid, it has the possibility of exchanging mass and energy in the form of heat with the medium in which it is found.
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The efficiency of a ramp is 75%. if the amount of work input is 240 j, what is the amount of useful work output?
Answer:
180
Explanation:
If the work input equals 240 then we follow the equation for work output.
Work output = (work input x efficiency)/100%
Work output = (240 x 75%)/100%
Work output = 180/100%
Work output = 180
The force in Newtons on a particle directed along the x-axis is given by F(x)=exp(−(x/2)+6) for x≥0 where x is in meters. The particle is constrained to move along the x-axis. Find the work done in Joules on the particle, W, in moving it from x=0 to x=1 using the fact that F=dW/dx. For your reference, 1 Joule = 1 Newton × 1 meter.,
The work done on the particle as it moves from x = 0 to x = 1 meter under the force F(x) = exp(-x/2 + 6) is obtained by integrating the force function over the distance, resulting in a measurable amount of work in Joules.
Explanation:The work done W on a particle as it moves from initial position xi to final position xf under a force F(x) is calculated by integrating the force over the distance. Considering the given force function F(x) = exp(-x/2 + 6), the work done from x = 0 to x = 1 meter is:
W = ∫ F(x) dx
= ∫ exp(-x/2 + 6) dx from x = 0 to x = 1
= ∫ e(-x/2 + 6) dx from x = 0 to x = 1
= -2e(-x/2 + 6) | from x = 0 to x = 1
= -2(e(-1/2 + 6) - e6)
= -2(e(11/2) - e6) Joules
By calculating the definite integral, we can find the total amount of work done in Joules on the particle during this displacement.
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A 65 Kg roller-blade is accelerating at 5 m/s/s across the side walk. What force would be necessary for this acceleration to occur?
With what minimum speed must you toss a 200 g ball straight up to just touch the 15-m-high roof of the gymnasium if you release the ball 1.6 m above the ground? solve this problem using energy.
Question 2 Saved
What might you look for as evidence that fusion occurs inside a star?
Question 2 options:
antiprotons
protons
electrons
neutinos
Assume that the porsche's maximum speed is 78.0 m/s and the police car's is 58.0 m/s. at the moment both cars reach their maximum speed, what frequency will the porsche driver hear if the frequency of the police car's siren is 440 hz? take the speed of sound in air to be 340 m/s.
Example of figurative language the toast jumped out of the toaster. What effect of the argument can go with the example of figurative language
The example of figurative language in the phrase "the toast jumped out of the toaster" is a metaphor. Using figurative language in an argument can make it more engaging and persuasive.
Explanation:The example of figurative language in the phrase "the toast jumped out of the toaster" is a metaphor. A metaphor is a figure of speech that compares two different things by saying one thing is another thing, without using the words "like" or "as". In this case, the toast is compared to something that jumps, which creates a vivid image and adds interest to the description.
The effect of using this metaphor in an argument could be to make the argument more engaging and memorable. By using figurative language, the writer or speaker can convey their message in a more creative and impactful way, capturing the attention of the audience and making the argument more persuasive.
The transfer of energy as heat caused by the collision of molecules is called _________. radiation convection conduction contact
if a light ray strikes a flat mirror at an angle of 61 degrees above the mirrors surface, what is the angle of reflection in relation to the normal
Answer:
For any plane reflector, the angle of reflection is always equal to the angle of incidence.
We know that thelight ray at an angle of 61 degrees from above (i assume that those 61° are between the light ray and the surface of the mirror), so the angle with respect to the normal of the mirror will be the complementary angle A = 90° - 61° = 29°
This means that the incidence angle is equal to 29°, then, the reflection angle is also 29°.
Now, if the initial angle is with respect to the normal of the mirror, the reflection angle is equal to it, so the reflection angle is also 61°
What is the average acceleration during the time interval 0 seconds to 10 seconds?
a) 0.5 meters/seconds^2
b) 1 meter/second^2
c) 2meters/second^2
d) 3 meters/second^2,
The energy source used to produce most of the electrical energy in the United States is _______? Can someone help me on this?,
A ball is thrown upward from the ground with an initial speed speed of 25 meters/second; at the same instant, a ball is dropped from rest from a building 15 meters high. After how long will the balls be at the same height?
Which feature of the sun extends into the corona but is anchored in the photosphere? Core Prominence Solar flare Sunspot
The answer is solar flare. Solar flares are commonly accompanied by coronal mass ejection. Solar flares are periods when the sun is suddenly brighter at a spot at its surface. This is due to the ejection of electrons, ions, and atoms (plasma clouds) accompanied by electromagnetic waves.
Answer: Solar flare
Explanation:
How much work does the electric field do in moving a proton from a point with a potential of +155 v to a point where it is -65 v ? express your answer in joules?
The electric field does -3.52 times 10⁻¹⁷ joules of work in moving a proton from a potential of +155 V to -65 V.
To calculate the work done by the electric field in moving a proton from a point with a potential of +155 V to a point with a potential of -65 V, you need to use the following formula:
Work (W) = q times triangle V, where q is the charge of the proton and triangle V is the change in electric potential (voltage).
The charge of a proton (q) is 1.60 times 10⁻¹⁹ C. The change in electric potential (triangle V) is the final potential minus the initial potential, which is (-65 V) - (+155 V) = -220 V.
So the work done by the electric field is:
W = (1.60 times 10⁻¹⁹ C) times (-220 V) = -3.52 times 10⁻¹⁷ J.
The negative sign indicates that the work is done by the electric field, not by an external force.
A rocket, weighing 43576 N, has an engine that provides an upward force of 11918 N. It reaches a maximum speed of 713 m/s. For how much time must the engine burn during the launch in order to reach this speed? Call up positive.
When light is scattered while spreading out through the atmosphere, the light rays
Final answer:
Light scattering caused by the Earth's atmosphere results in the 'twinkling' of stars, polarization of light, and the blue color of the sky. The scattering leads to a blur and changing nature of the blur due to atmospheric conditions. Scattered blue light colors the sky and makes the Sun appear yellower.
Explanation:
When light rays spread out through the Earth's atmosphere, they undergo a process known as scattering. This can be compared to the way confetti is dispersed by the wind. As light from the stars enters our atmosphere, various air currents and atmospheric conditions alter their paths leading to a blurred image when viewed from Earth; this effect is often observed as the twinkling of stars. Interestingly, polarization by scattering also occurs, and the light from the sky can appear brighter or dimmer when viewed through polarized lenses like sunglasses due to this scattering effect.
The blue color of the sky is also a result of scattering. Molecules in the atmosphere scatter shorter wavelengths of light (blue) more than longer wavelengths (red). This preferential scattering causes the sky to appear blue and the sun to seem somewhat yellower than it would in space. Furthermore, the intensity of light diminishes as it travels farther from its source. The light from the sun travels such long distances that by the time it reaches Earth, its rays are essentially parallel, causing consistent scattering across the globe.
What material is rare in the atmosphere of earth, but common in the atmospheres of mars and venus?
Two children with masses of 22 kg and 40 kg are sitting on a balanced seesaw. if the heavier child is sitting 0.7 m from the center, at what distance from the center is the lighter child sitting? answer in units of m.
The distance from the center is the lighter child sitting is 1.4 m.
What is mass?A fundamental characteristic of an object, its inertia is quantified by its mass, which is a basic indicator of the volume of substance inside the thing. Because mass is such a fundamental quantity and is difficult to define in terms of another, definitions of it frequently appear circular.
It is possible to define every mechanical quantity in terms of mass, length, and time. The SI unit for mass, denoted by the letter m, is the kilogram. While mass is typically thought of as an immutable feature of an item, relativistic mass must be taken into account when traveling at speeds close to the speed of light.
Given:
Two children with masses of 22 kg and 40 kg are sitting on a balanced seesaw, the heavier child is sitting 0.7 m,
Calculate the force by both as shown below,
F = 22 × 9.8
F = 215.6
f = 40 × 9.8
f = 392
Calculate the distance as the seesaw is in equilibrium,
196x = 392 × 0.7
x = 274.4 / 196
x = 1.4 m
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Water vapor is an example of what phase? A. Plasma B. Gas C. Solid D. Liquid
Suppose you are holding a flat mirror and standing at the center of a giant clock face built into the floor. someone standing at 12 o'clock shines a beam of light toward you, and you want to use the mirror to reflect the beam toward an observer standing at 5 o'clock. what should the angle of incidence be to achieve this? what should the angle of reflection be?
Which two stimuli did John B. Watson associate in his infamous “Little Albert” experiment? A. a white lab rat and the boy’s mother B. fear and a loud noise C. a white lab rat and a loud noise D. fear and the boy’s mother
Answer:
C) a white lab rat and a loud noise
Explanation:
egde 2020
Describe the steps in which a power plant transforms the energy in fossil fuels to electrical energy.
Power plants burn fossil fuels to produce steam, which spins a turbine connected to a generator, converting thermal energy into electrical energy. The electricity is then transmitted and distributed to homes and businesses.
Power plants convert fossil fuels into electrical energy through the following steps:
1. Fuel Combustion: Fossil fuels (coal, natural gas, or oil) are burned in a boiler to produce heat, releasing chemical energy.
2. Heat Production: The heat converts water into high-pressure steam.
3. Steam Generation: The steam heats up and pressurizes.
4. Mechanical Energy: High-pressure steam spins a turbine, converting thermal energy into mechanical energy.
5. Electrical Generation: The turbine drives a generator, converting mechanical energy into electrical energy.
6. Transmission: Electricity is transmitted through power lines at high voltage.
7. Distribution: Substations reduce voltage for safe distribution to homes and businesses.
8. Waste Management: Steam is condensed back to water and reused, and emissions are controlled to minimize environmental impact.
This cycle efficiently converts fossil fuel energy into electrical power.
The heating curve of an ice-water mixture that is slowly heated to 125??C contains three sloped and two level portions. What do the two level portions in the graph represent?
A) heating
B) deposition
C) sublimation
D) phase changes
Which two energy sources can help a star maintain its internal thermal pressure? which two energy sources can help a star maintain its internal thermal pressure? nuclear fission and gravitational contraction nuclear fusion and chemical reactions chemical reactions and gravitational contraction nuclear fusion and gravitational contraction nuclear fusion and nuclear fission?
Answer:
nuclear fission and gravitational contraction
Explanation:
Which two energy sources can help a star maintain its internal thermal pressure? which two energy sources can help a star maintain its internal thermal pressure? nuclear fission and gravitational contraction nuclear fusion and chemical reactions chemical reactions and gravitational contraction nuclear fusion and gravitational contraction nuclear fusion and nuclear fission?
What is Nuclear fission is when a heavy nucleus split to release energy . it splits into two lesser nuclei.
Gravitational contraction:
is when there is collapse of an object in space due to the influence of its own gravity. This two phenomenon makes it possible for a satr to maintain its thermal (heat )pressure.
A solid object has a mass of 30 grams and a volume of 10cm3 what is the density of the object?
Materials having resistance changes as voltage or current varies are called:
A certain force gives a 5-kg object an acceleration of 2.0 m/s2. the same force would give a 20-kg object an acceleration of
The source of the magnetic field on the Sun is _____.
a. liquid iron in the core
b. liquid metallic hydrogen in the core
c. flowing plasma
d. thermonuclear reactions
Answer:
C) Flowing plasma
Which planet is most likely to have acid rain? A. Mercury B. Venus C. Mars D. Uranus