物理
运动学、受力分析、电学与方程推导。
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what do we mean by the star - gas - star cycle? the idea that stars in …
the continuous recycling of gas in the galactic disk between stars & the interstellar medium
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problems 1 - 2 are scientific calculator active. 1. the cost for rentin…
a. $C(150) = 25$, el costo de alquilar el scooter 150 minutos es 25 dólares. b. $C(55)=10$, el costo de alquilar el scooter 55 minutos es 10 dólares. c. No se proporcionan gráfica…
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question 37 which of the following shows the correct order of the stage…
C. GMC, Protostar, T Tauri star, Main sequence star, Giant star, Helium flash, Horizontal Branch star, Double shell - burning giant star, Planetary nebula, White dwarf star
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what is the last, though very important, step in a scientific investiga…
C. communicating results
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question 35 if a black hole has a mass of 65 msun, how large is its sch…
195 km
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question 34 brown dwarfs, white dwarfs, & neutron stars are all kept fr…
True
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in which of these examples is the greatest acceleration occurring? a 50…
C
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describe the acceleration experiment by astronaut david scott in 1971. …
Question 1: In 1971 on the Moon, David Scott dropped a hammer and a feather simultaneously, and they hit the ground at the same time due to the lack of air - resistance. Question …
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consider the four free body diagrams. free - body diagrams are diagrams…
D. Yes. In B and D. In both cases, there is a net force. In B, there is a net force to the left; in D there is a net force upward.
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an e1 elliptical galaxy is more elongated (i.e. football shaped) than a…
False
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question 31 which of the following statements is not true of the object…
It's accretion disk is so large that it shines brightly in visible light
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question 30 since all stars start their lives with the same basic compo…
mass they are formed with
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question 29 the heaviest element produced by stars before a supernova e…
False
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the image shows two opposite forces acting on a rolling cart, what can …
D. The forces are unbalanced, and net force on the cart moves it to the right.
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question 28 stars require a balance between gravity and pressure in ord…
True
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while studying balanced and unbalanced forces, jose and gina test what …
B. The box moves toward Gina
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the following table lists selectors in the left - column and html tags …
#portrait { } matches <img id="portrait" src="sal.jpg"> #logo { } matches <img id="logo" src="ka.jpg"> .portrait { } matches <img class="portrait" src="ginny.jpg"> .logo { } match…
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question 27 which process changes a protostar/pre - main - sequence sta…
the start of nuclear fusion in its core
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problems 1-2 are scientific calculator active. 1. the cost for renting …
# Explicación: ## Paso 1: Encontrar C(150) Observamos el rango de valores de la función. Cuando \(t = 150\), el rango es \(120<t\leq150\). En este rango, \(C(t)=25\). ## Paso 2: I…
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question 26 which of the following is not one of the categories of gala…
pinwheel galaxies
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in css, how would you select all the <p> tags on a page? choose 1 answe…
A. p { }
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complete the following statements about free - fall acceleration. free …
- Free fall is the motion of an object when the only force acting on it is gravity. - Galileo discovered that, neglecting the effect of air, all objects in free fall have the same…
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what kinds of objects lie in the arms & the disk of our galaxy? emissio…
E. all of these
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question 24 current theories say that the maximum mass a neutron star c…
True
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question 23 a barred spiral galaxy is a galaxy which looks a lot like a…
is a spiral with an elongated bulge
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a simplified model of a tug of war scenario is shown here. a student is…
B. If force 1 is 75 N and force 2 is 50 N, the winner of tug of war will be the player on the left. D. If force 1 is 50 N and force 2 is 80 N, the winner of tug of war will be the…
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question 22 a galaxy with an unusually high star formation rate is prob…
D. any or all of these choices are likely
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recall and write the definition of the review vocabulary term. origin u…
1. In a coordinate - system, the point (0,0) where axes intersect; a starting point or source. 2. Free - fall acceleration 3. Free fall 4. Gravity is the only significant force ac…
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question 21 the milky way is moving further away from most other galaxi…
True
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in css, how would you select all the <p> tags on a page? choose 1 answe…
A. p { }
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a student tested a variety of interacting forces to determine how they …
C. The variable shown by letter A would result in a movement of the object to the right. D. The variable shown by letter C would result in a movement of the object to the right.
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in css, how would you select this heading by its id? <h1 id=\title\>flu…
D. #title { }
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question 19 which of the following is not a feature of a central domina…
they're often spiral galaxies
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sofia and marcus tie a ribbon to a hook and place two identical portabl…
A. Change the setting of A/C Unit 2 so it is blowing the same amount of air as A/C Unit 1.
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in css, how would you select only the list items with class name \impor…
C. .important { }
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jose and gina are studying balanced and unbalanced forces and are chall…
A. The box does not move.
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when inserting images in your presentation, you do not need to worry ab…
- False - b. Shift
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a scenario where two people are sitting on a see - saw is modeled here.…
B. Person A has a force of 80 N and person B has a force of 70 N. D. Person A has a force of 50 N and person B has a force of 40 N.
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consider the free - body diagram. if you want the box to move, the forc…
B. frictional force
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what jobs do you think of when you hear the phrase local government? wr…
City manager, clerk, sanitation worker, local law - enforcement officer (among others)
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shapes are located on the ___ tab in powerpoint o a home o b design o c…
Question 1: c. Insert Question 2: c. the dialog box launcher
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using two spring scales, students pull on opposite sides of a dynamic c…
B. The cart will move to the left.
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which sentence best sums up the authors point of view in this section o…
We must prevent children from getting into the habit of being prodded for every duty as the current system of prodding in school education can have negative impacts on their under…
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which might a jeweler recast? a gold ring a nugget of gold
a gold ring
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4* a piece of paper flew out of a school classroom with a gust of air. …
C. The paper experiences friction as it falls, E. The paper experiences air resistance that slows its fall
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which are in the process of resolidifying? melting ice cubes getting fr…
melting ice cubes getting frozen again
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the image shows two opposite forces represent in newtons (n) acting on …
D. The forces are balanced. Thus, there is no change in forces acting on the rope and the rope's motion is not affected.
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question 18 which of the following statements about spectral types of s…
B. A star with spectral type O star is always bluer than a star with spectral type M.
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what does it mean when we say the earth revolves around the sun? it kee…
it takes a year to orbit the sun once
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question 17 which of the following best summarizes current ideas about …
the universe's expansion seems to be accelerating ("Big Rip"), but future discoveries could change this hypothesis
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what happens during data retrieval? you access data from a database you…
you access data from a database
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question 16 what do we mean by a protogalactic cloud? its a cloud of ma…
it's a cloud of matter that contracts to become a galaxy
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the image shows two opposite forces acting on a rope. what can we say i…
C. The forces are unbalanced, and net force on the rope moves it to the left.
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directions: use article ii, section 1 of the constitution to answer the…
1. Four years 2. The vice - president 3. The number of its senators and representatives in Congress 4. $400,000 per year 5. a. A natural - born citizen b. At least 35 years old c.…
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samantha points a telescope at an altitude of 32° to see the star pollu…
1. $7$ 2. $7$
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question 15 while on the main sequence, stars may generate energy throu…
the proton - proton chain or the CNO cycle
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4. emma and luis hold up a strand of hair and point two identical hair …
D. Move Hair Dryer 2 so that both dryers are blowing on the left side of the hair.
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question 14 which statement about pulsars is not thought to be true? pu…
Pulsars are really hot white dwarf stars.
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homework 2.1 due in the bin 10/15 (wednesday) directions: solve & ident…
# Explanation: ## Paso 1: Analizar el primer caso La gravedad ejerce una fuerza hacia abajo y el suelo una fuerza hacia arriba igual. Las fuerzas son iguales y opuestas. ## Paso 2…
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what happens when an object reflects light? that light is sent elsewher…
that light is sent elsewhere
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question 13 approximately 30% of the mass of a galaxy like the milky wa…
False
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in css, how would you select all the <h1> tags on a page? choose 1 answ…
B. h1 { }
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question 12 which event marks the beginning of a massive star supernova…
the sudden collapse of an iron core into a compact ball of neutrons
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which type of behavior might reinforce your opinion of someone? behavio…
behavior that is consistent with your opinion
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question 11 our sun is an intermediate - mass star. true false
False
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39. graphs a sprinter walks up to the starting blocks at a constant spe…
For the velocity - time graph: 1. Start with a non - zero horizontal line for walking to starting blocks. 2. Then a horizontal line at \(v = 0\) for waiting. 3. Followed by an upw…
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question 10 which of the following shows the correct order of the stage…
D. GMC, Protostar, Pre - main - sequence star, Main sequence star, Giant star, Horizontal Branch star, Several phases of multiple - shell burning giant star/Supergiant, Supernova,…
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which of the following statements about the sunspots & the sunspot cycl…
The rate of nuclear fusion in the Sun peaks every 11 years.
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which urine color is an indicator of proper hydration? a. clear b. pale…
B. Pale yellow
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question 8 when a star under about 8 - 10 solar masses ends its lifetim…
a planetary nebula with a white dwarf in the center
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question 7 if a stars apparent magnitude is -1 & its absolute magnitude…
False
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question 6 dark energy has been hypothesized to exist in order to expla…
C. observations suggesting that the expansion of the universe is accelerating
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question 5 which of the following statements about neutrinos is not tru…
B. Neutrinos do not have mass at all.
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a police helicopter takes off from the roof of a building. after reachi…
# Explicación: ## Paso 1: Inicio del vuelo Al principio, el helicóptero despega desde el techo del edificio, por lo que la altura en el tiempo $t = 0$ es la altura del edificio. L…
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question 4 (mandatory) (4 points) name the medical terminology for \con…
thrombosis
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who might need rehabilitation? someone whos healthy someone whos sick
someone who's sick
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question 4 according to current understanding, what is a quasar? a very…
an active galactic nucleus powered by an accretion disk around a supermassive black hole
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question 3 why dont we expect to find life on planets orbiting a high -…
their lifetimes are too short to allow life to evolve & they generally produce more ionizing radiation
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question 2 stars spend about 90% of their lifetime in the red giant pha…
B. False
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question 1 (mandatory) (4 points) as a pharmacy technician, if you come…
1; 2
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question 1 less than 3800 exoplanets have been found around stars other…
B. False
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14. what is a reinforcer? 15. what did rachlin believe about learning? …
14. A reinforcer is a stimulus that increases the probability of a behavior being repeated. 15. Rachlin believed learning involved making choices between different reinforcers ove…
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2 motion with constant acceleration (continued) 36. distance an in - li…
$33.75\text{ m}$ ### 37.
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question 3 (mandatory) (4 points) name the medical terminology for \abo…
Hyper -
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2 motion with constant acceleration (continued) check your progress 33.…
33. $\Delta x=\frac{v^{2}-v_{0}^{2}}{2a}$ 34. $a\approx - 1.26\ m/s^{2}$ 35. a. $\Delta x = 1350\ m$ b. $v = 90\ m/s$
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analysis of a 100 ml water a sample finds 3.2x10^(-6) g of mercury. cur…
32 $\mu g/L$, 16 times over
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complete the text with the correct pair of words. after adolf hitler ca…
persecuted... emigrate
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what is the concentration in ppm of selenium if 1.3 milligrams is found…
Question 1: B. 0.00052 ppm Question 2: A. 0.52 ppb
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problem displacement an automobile starts at rest and accelerates at 5.…
$x_f\approx19.7$ m
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the following table lists selectors in the left column and html tags in…
#portrait { } - <img id="portrait" src="sal.jpg"> #logo { } - <img id="logo" src="ka.jpg"> .portrait { } - <img class="portrait" src="ginny.jpg"> .logo { } - <img class="logo" src…
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write the equation that relates position, velocity, and constant accele…
The equation is $v^{2}=v_{0}^{2}+2a(x - x_{0})$. It means the square of the final velocity equals the square of the initial velocity plus twice the product of acceleration and dis…
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the descent of masses of snow from their original positions sometimes h…
D. Each time it snows, more snow accumulates on the mountainside.
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2. solve for the unknown use the relationship among displacement, veloc…
$\Delta x_1 = 10v$, $\Delta x_2 = 20v$
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2. solve for the unknown use the relationship among displacement, veloc…
$\Delta x_1 = 10v$ (where $v$ is the velocity)
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try it! (continued) 2. solve for the unknown use the relationship among…
$\Delta x_1 = 10v$, $\Delta x_2 = 20v$
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super practice. (extra credit) uranium - 238 undergoes a series of 14 n…
| Decay Type | Reactant | Products | |--|--|--| | Alpha | $^{238}_{92}U$ | $^{4}_{2}He+^{234}_{90}Th$ | | Beta | $^{234}_{90}Th$ | $^{0}_{-1}e + ^{234}_{91}Pa$ | | Beta | $^{234}_…
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question 6 1 pts which of the following statements most likely explains…
Spontaneous mutations in genes associated with muscular dystrophy are more common.
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try it! problem finding displacement from a velocity - time graph the v…
For $\Delta t_1 = 10.0$ s, the displacement is 376 m. For $\Delta t_2 = 20.0$ s, the displacement is 752 m.
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question 3 of 6 which of the following is linked to regular cannabis us…
cannabis use disorder
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how do you write 0.0090142 in scientific notation?
$9.0142\times10^{- 3}$