When an object has more negative charge than a positive charge, the object is called a negatively charged object or anion.
What is a negatively charged object?A negatively charged object has more electrons than protons. This is because electrons are negatively charged subatomic particles in an atom. A neutral object has the same number of protons as electrons. Electrons or negative charges can flow freely from object to object.
When an object has a positive charge, it has more protons than electrons. Therefore, when an object has a negative charge, then that object contains more electrons than protons. Electrical effects are caused by the charge imbalance between a negatively charged object and a positively charged object.
Therefore, when an object has more negative charge than a positive charge, the object is called a negatively charged object or anion.
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the thermal energy of what system does change
Answer:
there is the increase the temperature of cold body and decrease the temperature of hot body
A ball is thrown straight upward from ground level with a velocity of 18 m/s. How much time passes before t here ball strikes the ground?
The time taken for the ball to strike the ground given the data is 3.68 s
Data obtained from the question Initial velocity (u) = 18 m/sTime to reach the ground (T) =?How to determine the time to reach maximum height Initial velocity (u) = 18 m/sFinal velocity (v) = 0 m/s (at maximum height) Acceleration due to gravity (g) = 9.8 m/s²Time to reach maximum height (t) =?
v = u – gt (since the ball is going against gravity)
0 = 18 – 9.8t
Collect like terms
0 – 18 = –9.8t
–18 = –9.8t
Divide both side by –9.8
t = –18 / –9.8
t = 1.84 s
How to determine the time to reach the ground Time to reach maximum height (t) =? Time to reach the ground (T) =?T = 2t
T = 2 × 1.84
T = 3.68 s
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why do we use days and hours instead of hours?
Answer:
becuase counting by hours is more complicated. then days, to make it easier to understand instead of saying I will see you in 48 hours... its easier to understand and think to say see you in 2 days!
Explanation:
hope this helps. also we did not determine time. people from history did so... wasnt really my choice or anyones!
Alexis is studying how lenses work. She looks through a magnifying glass and through the peephole of a door.
Which best describes a difference between the lenses used in these two devices?
The lens in the magnifying glass can produce both real and virtual images, but the lens in the peephole can produce only real images.
The lens in the magnifying glass can produce only real images, but the lens in the peephole can produce both real and virtual images.
The lens in the magnifying glass can produce both upright and inverted images, but the lens in the peephole can produce only upright images.
The lens in the magnifying glass can produce only inverted images, but the lens in the peephole can produce inverted and upright images.
Answer:
The lens in the magnifying glass can produce both upright and inverted images, but the lens in the peephole can produce only upright images.
Explanation:
Answer: C
Explanation:
The kinetic energy
as the roller coaster goes downhil
Answer:
Increases
Explanation:
The kinetic energy _____ (Increses)
as the roller coaster goes downhill
(Resistors in Series and Parallel) In which 120-V light bulb does the filament have greater resistance: a 60-W bulb or a 120-W bulb? If the two bulbs are connected to 120-V line in series, through which bulb will there be the greater voltage drop? What if they are connected in parallel? Explain your reasoning.
The 120-W bulb has a greater resistance and will have a greater voltage drop.
What is power?Electrical power is the rate at which work is done in a circuit. It is obtained by; P = V^2/R
For the 60-W bulb;
R = P/V^2 = 60-W/(120)^2
R = 0.0042 ohm
For the 120-W bulb;
R = P/V^2 = 120-W /(120)^2
R = 0.0083 ohm
Hence, we can see that when we compare the two bulbs, the 120-W bulb has a greater resistance and will have a greater voltage drop.
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the quantity that can be zero if body remains in motion for some time
Answer:
ok I think sooo
Explanation:
Velocity and displacement
Please help !! With my hw
Covert the grams into kilograms.
Explanation:
Well the formula for Ke is simply 1/2(mv^2)
So by the use of SI units- (i.e. kg for mass and m/s for velocity) Hector could easily compute Ke
An apple with mass 1.2kg falls out of a tree. Just before it hits the ground, it has a velocity of 7.3m/s. From what height did the apple fall?
Answer:
2.72 m.
Explanation:
Apply conservation of mechanical energy:
[tex]\displaystyle U_i + K_i = U_f + K_f[/tex]
There is zero kinetic energy initially and zero potential energy as the apple hits the ground. Thus:
[tex]\displaystyle U_i = K_f[/tex]
Substitute and solve for h:
[tex]\displaystyle \begin{aligned} mgh_i & = \frac{1}{2}m{v_f}^2 \\ \\ h_i & = \frac{{v_f}^2}{2g} \\ \\ & = \frac{(7.3\text{ m/s})^2}{2(9.8\text{ m/s$^2$})} \\ \\ & \approx 2.72 \text{ m}\end{aligned}[/tex]
Therefore, the apple fell from an approximate height of 2.72 m.
Alkaid and Merak are 25.6 ∘ apart in the earth's sky. Find the distance in light-years from Alkaid to Merak. Express your answer in light-years.
Answer:
Distance =
a
2
+b
2
−2abcosθ
=
101
2
+77
2
−2×101×77×cos(25.6
0
)
which gives,
10201+5929−15554×0.8928
=45.85 which is nearly 46 ly.
Explanation:
:)
Which of the following statements is true about two objects in thermal equilibrium
Answer:
the last statement is the true one
Earth quakes near the California Bay typically occur at frequencies of 1.5HZ or 2.8HZ. If you were engineering a new building in that area, choose the natural frequency you would want your building to have so that it would be least likely to collapse during an Earthquake.
a. 2.0 Hz
b. 1.6 Hz
c. 2.7 Hz
Answer:
2.0 Hz
Explanation:
2.0 Hz is the most closest to the middle number in between 2.8 and 1.5 Hz. 1.6 Hz would not be suitable as it is too close to 1.5 Hz and 2.7 would also not be suitable as it is too close to 2.8 Hz.
What's the temperature –20°C in degrees Fahrenheit?
Answer:
-4 F
Explanation:
F = 9/5 ( C) + 32
= 9/5 (-20) +32 = -4 F
Four ways to encourage immigrants positively
Answer:
See below.
Explanation:
1) Build relationships with key leaders and organizations
Early on, communicate with immigrant community leaders and groups to establish contacts, learn about these communities, and express your desire to include immigrant citizens in civic and political life. Make a list of them and keep it updated. Individuals and groups, be on the lookout for opportunities to meet with them and participate in local activities. Keep in touch with them on a regular basis and attend their events and activities.
2) Identify issues that immigrants care about
Identify problems of interest to immigrant populations through personal interactions, surveys, and meetings with local groups, and be prepared to include these themes in community talks and other public engagement initiatives. If a need is found, you can start with conversations and civic involvement in immigrant communities, since this can create channels for participation and leadership development for people who might not otherwise participate. Demonstrate how civic involvement may assist immigrants in achieving their goals and aspirations.
3) Overcome language barriers
Every participant should be prepared to participate, understood, and comprehend what others are saying as part of public engagement activities. Translation equipment and services should be provided, as well as outreach and issue background materials that are relevant for your community. The translation services should be mentioned in outreach for public engagement activities.
Ensure that documents are translated by native speakers or those who are entirely proficient in order for translations to be comprehended by readers. When conducting polls and surveys, it is preferable to ask questions in the native language of the residents. You may contact people with varied literacy levels through face-to-face, radio, and other non-written interactions.
4) Use effective media and outstretch strategies
Integrate immigrant-focused local and regional print and electronic media into your communication plan. Build ties with these media outlets, provide them access to information and local officials, send them news, announcements, and job ads, and work with them as partners to develop effective outreach to increase public participation. Inform suitable community, service, or business groups, schools, congregations, and others about a forthcoming public engagement activity. Request that the leaders of these organizations include particular solicitations for their immigrant members, as well as follow up with and assist those who are interested in attending.
what are the advantages and disadvantages of specific heat capacity
Answer:
Explanation:
what are the advantages and disadvantages of specific heat capacity
Consider an object of mass 2kg at rest on a ramp with =0.5 and =0.4.
If the ramp angle is 60 degrees, how far can the object travel in the first 3 seconds?
Give your answer in m with 1 decimal place.
The distance travelled by the object in the first 3 seconds will be 29.4 m.
What is acceleration?The rate of change of velocity with respect to time is known as acceleration. According to Newton's second law, the eventual effect of all forces applied to a body is its acceleration.
The equation of the motion along the inclined plane;
[tex]\rm mg sin \theta - F_k = ma \\\\ 2 \times 9.81 \times sin 60^0 -3.929 = 2a \\\\ a= 6.533 \ m/sec ^2[/tex]
The distance traveled by the block for the given time interval ,t=3 sec is ;
[tex]\rm S= ut+ \frac{1}{2}at^2 \\\\ S= 0 \times 3 + \frac{1}{2} \times 6.533 \times (3)^2\\\\ S=29.4 \ m[/tex]
Hence,the distance travelled by the object in the first 3 seconds will be 29.4 m.
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165=4+(10)T Write answer nearest tenth place
Answer:
16.1
Explanation:
165 = 4 + ( 10 ) T
165 = 4 + 10T
Subtract 4 on both sides,
165 - 4 = 10T
161 = 10T
10T = 161
Divide 10 on both sides,
T = 161 / 10
T = 16.1
A hummingbird’s wings beat 100 times in 5 seconds. What is the frequency?
PLS HELP THIS IS MY LAST QUESTION :)
Answer:
All of the above
Explanation:
At start it has only PE
PE is converted to KE
at bottom all of the PE is now KE
KE and PE along the way = PE at the start
The speed of light (c) is:
A) 3.00*108 m/s
B) 9.8 m/s2
C) 3.14159265
D) Over 9000!
Answer:
A
Explanation:
Speed of light is 299 792 458 m / s. So option A is answer.
Which of the following gives good evidence for the particle nature of EM radiation?
Answer:
1. Which of the following gives good evidence for the particle nature of EM radiation?
-photoelectric effect
2.Which of the following gives good evidence for the wave nature of EM radiation?
-interference patterns
3.When studying the photoelectric effect, which parameters did scientists think were relevant for electrons to be released or not in both the wave and particle models?
-frequency and intensity for the wave model; frequency only for the particle model
4.The image represents the gaps between allowed energy levels for electrons. Which model best describes this phenomenon?
-the particle model because the arrows represent discrete particle-like jumps
5. Which subatomic particle has the smallest mass?
-electron
6.The atomic number on the periodic table refers to the number of _____ within an atom.
-protons or electrons
7.Considering that an up quark has a charge of +23 and a down quark has charge of −13, which of the following represents the correct quark combination for a proton?
-2 up, 1 down
8. If an atom gives off electromagnetic radiation with a frequency of 2.0×1015s−1, what is the radiation’s energy?
-1.3×10−18 J
9. A nuclide of phosphorus 3015P decays into a nuclide of silicon 3014Si. In order to satisfy charge conservation and lepton number conservation the other products must be __________.
-a positron and an antineutrino
10.In a gamma decay process __________.
-a parent nuclide was in an excited state
11.Nuclide X has a higher rate of decay than nuclide Y. Based on this information, which of the following statements must be true?
- Nuclide Y has a larger half-life than nuclide X.
12. A microwave has a typical wavelength of about 0.1 meter. What is the comparable wavelength of a radio wave?
-Greater than 0.1 meter.
13.A satellite phone can be used to place a call from virtually anywhere in the world. What type of wave does the satellite phone likely transmit to the satellite orbiting above Earth?
-radio wave
14.The speed of a light wave c is related to its wavelength λ and its frequency f by c=λf. If the speed of light is 3×108 meters/second and the wavelength of an infrared wave used in a remote control is 7×10−9 meters, then what is its frequency?
-4×1016 Hz
15.In what way does a lead apron protect human cells from X-rays?
-In what way does a lead apron protect human cells from X-rays?
16.Why are children more susceptible to the effects of ionizing radiation?
-They have many growing cells that can easily have DNA damaged.
17.Which statement is correct about the half-lives of radioactive elements?
-The half-lives of radioactive elements vary from fractions of a second to billions of years.
18.Source A has a half-life of 10 million years, and source B has a half-life of 5 million years. After 10 million years, what percent of each source remains?
-50% of source A and 25% of source B
19.The probability that a randomly chosen nucleus in a radioactive sample will have decayed in a given time is 96.875%. How many half-lives has the sample experienced?
-5
20.A radioactive sample starts with 800,000 undecayed nuclei. After 12 hours, 700,000 of the nuclei have decayed. What is the half-life of the sample?
- 4 hours
21.How did the development of electrical signals sent through wires change communication?
-Signals could be sent anywhere a wire could reach and no longer were restricted to line of sight.
22. Essay
23.Essay
24.Essay
25.Essay
26.Essay
Explanation:
100% correct
One phenomenon which well presents the idea of wave particle duality is the photoelectric effect.
What is wave particle duality?
The term wave particle duality has to do with the fact that a wave can behave sometimes as a wave and sometimes as a particle. This was well established by the work of De Broglie.
One phenomenon which well presents the idea of wave particle duality is the photoelectric effect.
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The chart shows characteristics of stars. A 3 column table with 7 rows. The first column is labeled color with entries red, orange, yellow to white, white, white to blue, blue, blue. The second column is labeled surface temperature in Kelvin with entries greater than 25000, 11000 to 25000, 7500 to 11000, 6000 to 7500, 5000 to 6000, 3500 to 5000, under 3500. The last column is labeled average mass in solar mass units with entries 60, 18, 3.2, 1.7, 1.1, 0.8, 0.3. Sirius is a blue-white star with a surface temperature of about 9800 K. What is most likely the mass of Sirius? 1.0 solar mass 1.4 solar mass 2.0 solar mass 12 solar mass
Sirius is a blue-white star, expressing -1.5 magnitude, 9800ºK of temperature, and located 8.6 light-years from the Earth. Its mass is 2 solar mass. Option C.
What is Sirius?
Sirius seems to be one of the most brilliant stars in the sky. It shines with a magnitude of -1.5, being only superated by the moon, the sun, and some planets -Venus and Jupiter-.
Sirius is a blue-white star, 25 times more luminous than the sun, its mass is twice the sun's mass, and its temperature reaches approximately 10000 K. It is the fifth star closer to the Earth, located at a distance of 8.6 light-years.
Sirion is visible from almost every place around the world, excepting latitudes higher than 73º N. It can be seen in the Canis Major constellation. It is also easily identified by looking down from the Orion belt.
Color Surface temperature (ºK) Average mass
red > 25000 60
orange 11000 to 25000 18
yellow-white 7500 to 11000 3.2
white 6000 to 7500 1.7
blue-white 5000 to 6000 1.1
blue 3500 to 5000 0.8
blue < 3500 0.3
According to this chart and the provided information, the mass of this blue-white star shoud be between 1.1 and 3.2 solar mass units.
To make a better estimation of the Sirus mass, we can make use of the following formula,
(M/M₀)²'⁵ = (T/T₀)⁴
This formula describes the relationship between the mass and temperature of the sun and of another star.
Where,
M ⇒ Mass of the other starM₀ ⇒ Mass of the sun ⇒ 1 solar mass.T ⇒ Temperature of the other star ⇒ 9800K T₀ ⇒ Temperature of the sun ⇒ 5778K(M/M₀)²'⁵ = (T/T₀)⁴
(M/M₀)²'⁵ = (9800K/5778K)⁴
(M/M₀)²'⁵ = (1.696)⁴
(M/M₀)²'⁵ = 8.27
(M/M₀) = ²'⁵√8.27
(M/M₀) = 2328
M = 2328 x 1 solar mass
M = 2328 solar mass
According to this formula, we might say that the mass of the Sirus star is around 2 solar mass. Option C.
As said before in the introduction, Sirius mass is aproximately twice the sun mass.
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_____ force and _____ force are really 2 parts of the same force.
Answer:
___action__ force and __reaction___ force are really 2 parts of the same force.
Explanation:
The slope of a distance time graph is 2. What is the velocity of the object?
Answer:
Explanation:
when the slope is two, for distance, then we know the the velocity ( the derivative) is 2 :)
A stationary body is acted upon by a number of forces. State the two conditions which must apply for the body to remain at rest.
Answer:
1. All the externally applied forces were cancelled out.
2. The externally applied force is not exceeded the limiting friction
Explanation:
A car travels at 20 m/s. On the other side of the road another car travels towards it at 15 m/s. What is their relative velocity in m/s?
Answer:
35 m/s
Explanation:
Use the numbers below for this problem only
X Y
0 4
-1 4
7 -8
8 2
-4 4
5 6
6 -4
(ΣX)(ΣY) =
The product of the summation of x-variables and y-variables is determined as 168.
Summation of X variables
The summation of x variables is determined as follows;
∑X = 0 - 1 + 7 + 8 - 4 + 5 + 6 = 21
Summation of Y variables
The summation of Y variables is determined as follows;
∑Y = 4 + 4 - 8 + 2 + 4 + 6 - 4 = 8
Product of the summations(ΣX)(ΣY) = 21 x 8 = 168
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a car on the motorway is accelerating at 25ft/sec. if it started from rest and has been accelerating for 5 sec. how far has it travelled during this time of acceleration?
Answer:
312.5 ft
Explanation:
x = xo + vo t + 1/2 a t^2 xo = 0 v0 = 0
x = 1/2 a t^2 = 1/2 (25)(5^2) = 312.5 ft
A force of 2500 N is exerted on a piston that has an area of 0.060 m2. What force is exerted on a second piston that has an area of 0.18 m2? LA F_F2
А. А.,
O A. 5500 N O B. 230,000 N
C. 830 N O D. 7500 N
Put the values inside formula
2500/0.06=F2/0.1841666.7=F2/0.18F2=41666.7(0.18)F2=7500N(Approx)Option D
Gamma radiation is a type of __________ radiation of a very high frequency. What one word completes the sentence?
Answer:
I think your answer is: Electromagnetic!
Please mark brainliest! Have a nice day! :)
Gamma radiation is a type of electromagnetic radiation of a very high frequency.
What are the Gamma radiations?Gamma radiations are high-energy electromagnetic radiation that is emitted by an atomic nucleus undergoing radioactive decay.
The energy associated with subatomic particles that are emitted during the decay of unstable atomic nuclei is known as radiation. There are three forms of radiation which are Alpha (α) radiation, Beta (β) radiation, and Gamma (γ) radiation.
Gamma radiations are extremely high-frequency radiation containing high-energy photons. Gamma rays are capable enough of releasing electrons from atoms causing their ionizing in nature. Gamma radiation is used in the treatment of cancer as the cancerous tumor undergoes gamma radiation, which kills its DNA.
Gamma rays can cause animal cells to decay so they are biologically dangerous. Gamma rays have wavelengths of less than 10 picometers and frequencies of above 10 exahertz. Gamma rays need a special kind of detector, known as a gamma rays telescope.
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