1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
Leona [35]
3 years ago
11

a penny dropped into a wishing well reaches the bottom in 1.5 seconds. what was the velocity at impact? i did -9.8 X 1.5 and got

-14.7... is it negative or positive? because the acceleration due to gravity is -9.8... idk help please asap
Physics
1 answer:
nexus9112 [7]3 years ago
3 0

Before you ever start doing a problem that involves direction, YOU DECIDE
which direction you're going to call positive.

If you call UP the positive direction, then the force of gravity is a negative
force (it pulls down), the acceleration of gravity is a negative acceleration
(because it's in the direction of a negative force), and things that are falling
have negative velocity.

It's your decision.

The acceleration due to gravity and the force of gravity are in the same
direction.  If something falls out of your hand, OF COURSE it's going to
move in the same direction as the force on it.

========================================

Let's say you decided to call UP the positive direction.
Then the acceleration of gravity, and the force of gravity, are both negative.

Now you throw a rock straight UP.

-- Its velocity is positive.

-- But its acceleration is negative, so its velocity is going to keep shrinking,
less and less, until it becomes zero.  (Top of the rock's trip.)

-- Since the negative acceleration points down, it eventually conquers
the upward velocity, and the velocity begins to point down (negative).

-- Now the acceleration is in the same direction as the velocity (both
are negative), so the velocity starts growing, becoming more and more
negative, as the acceleration keeps adding speed to it.

What does all this mean ?

When you throw a rock straight up, it goes slower and slower,
strops rising at some point, starts falling, then gets faster and
faster as it falls.

Everybody knows this as soon as they get to be 2 or 3 years old.
But they don't think about it in negative and positive velocity and
acceleration, until they get to high school and learn the language 
of Physics.

You might be interested in
Which group's right to vote is protected by the Nineteenth Amendment? Question 7 options: African Americans Native Americans 18-
lisabon 2012 [21]

7. The nineteenth amendment protects the right to vote of 18 year old women.

8.The 24th amendment eliminated poll taxes and increases voting rights in the United States.

9.National voter Registration allowed the option for adults to register vote when they obtain or renew  a driver's license.

10.Three steps in voting process are registering to vote, preparing to vote and casting a ballot.

11.The statement that was not an effect of the United States Supreme Court's ruling in Bush vs Gore is Tennessee's electoral collage votes went to Al Gore.

12.The general election requires the United States choose  a president

13.The type of election that is held to fill  a public office that is left vacant when an official resigns is special election.

14.The position that a person actually vote for when a voter chooses a candidate for president is an elector in the elector college.

15.A possible candidate for president would form an exploratory committee to see how much support he or she can expect.

4 0
3 years ago
Read 2 more answers
A particular circuit toolbox contains only 80 Ω resistors and switches, which can be open or closed. Construct a circuit, fillin
Strike441 [17]

Answer:

Here we need to make parallel connection of two 80 ohm resistors to achieve 40 ohm net resistance.

Explanation:

As we know that the resistances in series add up directly and here we are given with only the resistors of 80 Ω.

So when we connect two resistors of 80 ohm in parallel we get the resultant of 40 ohm.

Mathematically:

\frac{1}{R_p} =\frac{1}{R} +\frac{1}{R}

\frac{1}{40} =\frac{1}{R} +\frac{1}{R}

\frac{1}{40} =\frac{2}{R}

R=80\Omega gives us the only combination of two resistors in parallel.

3 0
3 years ago
I need help please please thank you
Romashka [77]

Answer:

the first one is energy level

Explanation:

5 0
3 years ago
What does addition of two vectors give you?
mash [69]

Answer:

Explanation:

To add or subtract two vectors, add or subtract the corresponding components. Let →u=⟨u1,u2⟩ and →v=⟨v1,v2⟩ be two vectors. The sum of two or more vectors is called the resultant. The resultant of two vectors can be found using either the parallelogram method or the triangle method .

4 0
3 years ago
Red, Yellow, Green, and Purple are in a physical fitness race, pulling different amounts of weights. Considering the equations f
solong [7]

Answer:

a

Explanation:

plz make me brainliest

4 0
3 years ago
Other questions:
  • A 40% pressure drop across an oil filter screen indicates that?
    9·1 answer
  • The chemical equation shown represents photosynthesis. Carbon dioxide plus A plus light with a right-pointing arrow towards B pl
    12·2 answers
  • A block has acceleration a when pulled by a string. if two identical blocks are glued together and pulled with twice the origina
    9·1 answer
  • Describe one way that the force of gravity And a magnetic force or similar describe where they are different
    7·1 answer
  • What determines how many electrons will leave a piece of metal in the photoelectric effect
    11·2 answers
  • The moon is about 3.8 X 10^5 km from the earth. Show that its average orbital speed about earth is 1026 m/s
    14·1 answer
  • The left face of a biconvex lens has a radius of curvature of magnitude 11.7 cm, and the right face has a radius of curvature of
    14·1 answer
  • About 30 % of earth’s water found In
    6·1 answer
  • In a two-dimensional Cartesian system, the x-component of a vector is known, and the angle between vector and x-axis is known. W
    12·1 answer
  • Even though it's not very popular these days, I like our system . Getting together to talk about who the best candidate might be
    14·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!