A car traveling at 10 m/s starts to decelerate steadily. It comes to a complete stop in 20 seconds. What is the acceleration?
Answers
Answer:
Explanation:
Your initial velocity () is 10 m/s, your time is 20 seconds. Although it is not explicitly mentioned in the problem, since you know the car comes to a stop, your final velocity (
) is 0 m/s.
The equation you can use to solve for acceleration (a) is
1. Plug in the numbers you do have, so your equation will look like this:
0=10+a(20)
2. Solve for a.
-10= 20a
-10/20=a
-0.5= a
a = -0.5
Related Questions
What is the answer for this in scientific notation (6.77 x 10³) + (5.85 x 10³) = ?
Which scientist first made a model of the atom called the plum pudding model?John DaltonJ.J. ThomsonErnest RutherfordNeils Bohr
In the series circuit below the power source is a 9-volt battery and three resistors are R1 = 7 ohm, R2 = 9 ohm and R3 = 2 ohm. What is the total resistance in the series circuit? R1 7 ohm + R2 9 ohm + R3 2 ohm = 18 Is this correct?
Momentum is a measure of ____.a. how hard it is to stop an object b. the amount of matter in an object c. the tendency of an object to change its motion d. the amount of force acting on an object
Answers
Answer:
a. 80 J/cell b. 1.02 × 10²¹ W/m² c. 8.77 × 10¹¹ V/m d. 2.92 × 10³ T
Explanation:
a. We know that energy E = Pt where P = power and t = time
The total energy delivered to all the 100 cells is E = average power × time
average power = 2 × 10¹² W and time = 4 ns = 4 × 10⁻⁹ s
E = 2 × 10¹² W × 4 × 10⁻⁹ s = 8 × 10³ J
The energy per cell E₁ = E/100 = 8 × 10³ J/100 = 80 J/cell
b. Intensity, I = P/A where P = power per cell = 2 × 10¹² W/100 = 2 × 10¹⁰ W and A = area = πr². Since the cell is modeled as a disk of diameter d = 5.0μm, r = d/2 = 5.0 μm/2 = 2.5 μm = 2.5 × 10⁻⁶ m
I = P/A = P/πr² = 2 × 10¹⁰ W/π(2.5 × 10⁻⁶ m)² = 1.02 × 10²¹ W/m²
c. The intensity I = E²/2cμ₀ where E = maximum value of electric field, c = speed of light = 3 × 10⁸ m/s and μ₀ = 4π × 10⁻⁷ H/m
E = √(I2cμ₀) = √(2 × 1.02 × 10²¹ W/m² × 3 × 10⁸ m/s × 4π × 10⁻⁷ H/m) = 8.77 × 10¹¹ V/m
The maximum magnetic field B is gotten from E/B = c
B = E/c = 8.77 × 10¹¹ V/m/3 × 10⁸ m/s = 2.92 × 10³ T
Answers
Final answer:
The first satellite to capture a photograph of Earth from space was Explorer 1, launched on January 31, 1958. This and subsequent space missions like the Apollo program expanded our visual understanding and perception of our planet.
Explanation:
The first satellite to give us a photograph of the Earth from space was Explorer 1, launched on January 31, 1958. Prior to Explorer 1, the Soviet Union had launched Sputnik 1 in October 1957, but Explorer 1 was the first satellite to provide us with images of Earth from space. This marked a significant moment in human history, altering our perception of the planet.
Later on, the Apollo program further improved our visual understanding of Earth, with the Apollo 17 mission capturing the 'Blue Marble' - one of the rare full disk images of the Earth in sunlight. Such images underscored our perception of Earth as a small, yet interconnected and strikingly beautiful, celestial body floating in the vastness of space.
Learn more about First Satellite Photograph of Earth here:
#SPJ11
Answers
Work is the product of force multiplied by the distance moved, but since the distance moved in the vertical direction is zero
Work Done = 0 joules
Given data
Force = 125N
Horizontal Distance = 2 m
Vertical distance = 0 m
Formula for work
Work = Force * Distance
Solution
substitute the given information
Work Done in the horizontal direction= 125*2
Work Done = 250 Joules
Learn more about work here:
Answers
b.#NAME?
c.#####
d.#FNCT?
Answers
Answer:
b.#NAME?
Explanation:
Remember, in Spreadsheet programs like Ms Excel several types of errors can occur such as value error.
However, since Seymour explains that there is a mistyped function name in the sheet it is more likely to display on the affected cell as #NAME?.
For example the function =SUM is wrongly spelled =SOM.
Therefore it is important to make sure the function name is spelled correctly.
Answers
-- Unless I miss my guess, the phrase "In two to four paragraphs,
explain ..." sounds like you want somebody to write a nice essay
for you, which you will then write your name at the top of and hand
it in as your own work. Are you sure you want to adopt this process
as a substitute for actually learning stuff ?
-- Sadly, you can probably forget about offering 5 points and getting
two to four paragraphs in return.
-- Another hunch of mine: You're referring to the "Young Person's
Guide to the Orchestra" ... a fugue and variations based on the
Rondeau from Henry Purcell's incidental music to Aphra Behm's
Abdelazar, composed by Benjamin Britten in 1946 for elementary
music education. The subject may not be too familiar to the people
who like to hang out here in the <Physics> category. You might
stand a better chance if you post the question again in <Arts> or
even <Social Studies>. I don't know of a way to 'move' a question
on Brainly, so you'll have to actually post it again ... and this time,
see if you can spare a few more points for an answer.
Answer:
Britten used a variety of instruments from different families and changed the traditional order. He started with the woodwinds, then strings, then brass, and percussion. He started with the highest pitched instruments in each of the families. This made the differences in the timbers of different sections of the orchestra more clear.
but he is right add more points next time you ask someone to do your work for you
Explanation: