a 6 kg block initially at rest is pulled to east along a horizontal, frictionless surface by a constant horizontal force of 12 n. find the speed of the block after it has moved 3m.
Solved
Show answers
More tips
- S Society and Politics Will Japan become Russia s Military Enemy?...
- P Philosophy Is Everything We Strive for Eventually Achieved and Destroyed?...
- S Society and Politics Understanding Politics and Its Role in the Development of Civilization...
- P Philosophy Why Did God Create Man and Place Him in Obscurity?...
- S Society and Politics Skoptsy: Who They Are and How They Perform Castration?...
- O Other Childhood Fears: What Many of Us Experienced...
- P Philosophy What is Something for you?...
- H Health and Medicine Why Do Humans Have One Heart?...
- P Philosophy Unbelievable stories of encounters with otherworldly forces...
- O Other How to Accidentally Get a Rare Coin with Your Change and How to Know Its Value?...
Answers on questions: Physics
- C Chemistry DOG SKELETAL SYSTEM BONES SKELETAL TISSUE BONE CELLS SMALLEST TO LARGEST...
- S Social Studies Before ww2 there was a __ that was a economic failure that began in the u.s and went around the world in which there was a high unemployment rate and low industrial...
- H History Which of these statements is true of Ashoka? He grew to hate violence. People He was an expert in astronomy. He gave up all his wealth to seek enlightenment. He built...
- M Mathematics Can someone with these 3 questions, they are in the pictures!...
Ответ:
Answers:
a)![3.46 m/s](/tpl/images/0356/9532/91fb0.png)
b)![2 m/s^{2}](/tpl/images/0356/9532/1c714.png)
Explanation:
The complete question is written below:
A 6 kg block initially at rest is pulled to East along a horizontal, frictionless surface by a constant horizontal force of 12 N.
a) Find the speed of the block (using work-kinetic energy theorem) after it has moved 3.0 m.
b) Find the acceleration of the block using Newton.
a) Speed of the block after it has moved 3mLet's begin by explaining the following:
The Work
done by a Force
refers to the release of potential energy from a body that is moved by the application of that force to overcome a resistance along a path. In addition,
is a scalar quantity, and its unit in the International System of Units is the Joule (like energy).
Now, when the applied force is constant and the direction of the force and the direction of motion are parallel, the equation to calculate it is:
Where:
On the other hand, energy is the ability of matter to produce work in the form of movement, light, heat, among others. In this sense, according to the Work-Kinetic Energy Theorem we have:
Where:
Where:
Hence, the Work-Kinetic Energy Theorem is written as follows:
Where the initial velocity is zero (
) since we are told the block is initially at rest:
So, we have to find the final velocity
, substituting (3) in (7):
(9) This is the speed of the block after it has moved 3m
b) Acceleration of the blockAccording to Newton's second law of motion, which relates the force
with the mass
and the acceleration
of an object, we have:
On the other hand, acceleration is the variation of velocity
in time
:
Then, equation (10) is rewritten as:
Isolating
:
Since
and
, we have:
Substituting (15) in (11):
Finally:
Ответ:
idk
Explanation:
dont you guys study