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
nadya68 [22]
3 years ago
10

A pencil is dropped from the roof of the school what is the speed after 3s down is the negative direction.

Physics
2 answers:
allsm [11]3 years ago
8 0
On Earth, the acceleration due to gravity is (-9.8 meters per second) per second.

If the school, the roof, and the pencil are on Earth,
then after 3 seconds, the pencil's speed is

[ (-9.8 meters per second)/second ] times [ 3seconds ] = <u>-29.4 meters per second </u>
uysha [10]3 years ago
4 0
You have to use 1st equation of motion v = u +at as distance(s) is not given.....
as pencil is dropped from rest therefore u = 0m/s and accleration due to gravity is = -9.8 m/s
v = 0 - (9.8)(3)
v = -29.4 m/s
You might be interested in
the height of seven falls in colorado is 5/2 the height of twin falls in idahi. the sum of the two heights is 420 ft. find the h
Masja [62]
Let height of twin falls = x
height of seven falls = 2.5x

x + 2.5x = 420
3.5x = 420
x = 420/3.5 = 120

so twin falls = x = 120 ft
seven falls = 2.5x = 300 ft
6 0
3 years ago
When steam condenses 1. All of these occur. 2. None of these occur. 3. molecules move closer together. 4. it changes from the ga
True [87]

2. None of these occur

5 0
3 years ago
Read 2 more answers
compare the theories that scientists proposed about the source of the sun's energy with the process of nuclear fusion in the sun
ANTONII [103]
The sun's source of energy is know as nuclear fusion (means to fuse) this process has a small nuclei atoms that join together to form a large nucleus. The result of this process is released energy. The fusion of hydrogen into helium in the sun makes a large amount of energy and this is known as the sun's energy source.
The theories that scientist proposed about the source of the sun's energy was that the sun burned fuel to generate its energy and that gravity was causing the sun to shrink slowly and have its energy released. Also both of these theories were disproved.
.
3 0
2 years ago
Explain why you can only change one variable in an experiment
ohaa [14]
The purpose of an experiment is to LEARN the EFFECT of something.

The way you do that is to CHANGE the thing and see what happens.

You can change as many things as you want to.  But If you change
TWO things and observe the result, then you don't know which one
of them caused the effect you see. 

Or maybe BOTH of them working together caused it.  You don't know. 

So your experiment is not really much good.  You need to do it again.
5 0
3 years ago
Suppose that the acceleration of a model rocket is proportional to the difference between 100 ft/sec and the rocket's velocity.
sp2606 [1]

Answer:

Explanation:

initial velocity, u = 0

final velocity, v = 80 ft/s

acceleration, a = 150 ft/s²

Let the time taken is t.

v = u + at

80 = 0 + 150 x t

t = 0.53 second

3 0
3 years ago
Other questions:
  • Hiran is standing beside the road when he hears a bird flying away from hip and chirping. The bird’s chirp has a frequency of 18
    11·1 answer
  • Question In picture PLEASE HELP NOW
    10·1 answer
  • A 5.7 kg block attached to a spring executes simple harmonic motion on a frictionless horizontal surface. At time t = 0s, the bl
    11·1 answer
  • HELPPPPPURGENT PLEASE NB 35
    15·1 answer
  • Can I apply my homework questions about physic?
    7·2 answers
  • What force is required to push a block (mass m) up an inclined plane that makes an angle of θ with the horizon at a constant vel
    6·1 answer
  • For a quantity of gas at a constant temperature, the pressure P is inversely proportional to the volume V. What is the limit of
    10·1 answer
  • If the radius of the earth was suddenly tripled and its mass doubled, the surface gravitational acceleration would become: A) 9.
    15·1 answer
  • If you are over 240 pounds you should only preform the high intensity exercises. True or False?
    9·1 answer
  • Which energy source is formed when organic matter is trapped underground without exposure to air or moisture?
    8·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!