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
Westkost [7]
3 years ago
8

3 cases where kinetic energy become potential energy

Physics
2 answers:
finlep [7]3 years ago
8 0
--  Toss a rock straight up.  The kinetic energy you give it
with your hand becomes potential energy as it rises. 
Eventually, when its kinetic energy is completely changed
to potential energy, it stops rising.

--  When you're riding your bike and going really fast, you come
to the bottom of a hill.  You stop pedaling, and coast up the hill.
As your kinetic energy changes to potential energy, you coast
slower and slower.  Eventually, your energy is all potential, and
you stop coasting.

--  A little kid on a swing at the park.  The swing is going really fast
at the bottom of the arc, and then it starts rising.  As it rises, the
kinetic energy changes into potential energy, more and more as it
swings higher and higher.  Eventually it reaches a point where its
energy is all potential; then it stops rising, and begins falling again.
Taya2010 [7]3 years ago
6 0

<span>Some things that you could say are: 1. When a parked lorry starts to move; 2. When a stone is dropped from a building; 3. When a marathon runner starts to run.</span>
You might be interested in
Does the shape of a skateboard affect how will travel?
nika2105 [10]

Answer:

Yes

Explanation:

The shape will affect the friction and the way the skateboard moves.

6 0
3 years ago
You set a small eraser at a distance of 0.27 m from the center of a turntable you find in the attic and establish that when the
Licemer1 [7]

Answer with Explanation:

We are given that

Distance,r=0.27 m

Tangential speed=v=0.49 m/s

a.Angular speed ,\omega=\frac{v}{r}

Using the formula

\omega=\frac{0.49}{0.27}=1.8 rad/s

\omega=\frac{2\pi}{T}

T=\frac{2\pi}{\omega}

Time period,T=\frac{2\pi}{1.8}=3.49 s

b.Amplitude,A=Distance of small eraser from the center of a turnable =0.27 m

c.Maximum speed,V_{max}=0.49 m/s

d.Maximum acceleration=a=r\omega^2=0.27(1.8)^2=0.87 m/s^2

5 0
3 years ago
Read 2 more answers
The force between two point-charges of 0.040 C and 0.060 C separated by certain distance is 2.2 x 10^5 N. what is the distance b
Gala2k [10]

Answer:

im in hardvard dont cheat and get good grades and become a graduate

it is c

Explanation:

8 0
3 years ago
Read 2 more answers
A 2-kg box is pushed to the right by a force of 4 N for a distance of 32 m. It has an initial velocity of 4 m/s to the right. NO
rewona [7]

Answer: a) 8 Kg m/s b) 16 Kg m/s c) 24 Kg m/s d) 16 J e) 128 J f) 144 J

              g) 4 s

Explanation:

a) As momentum by definition is the product of mass times the velocity (is a vector quantity), we can write in this case the following:

pi = m. v₀ = 2 Kg . 4 m/s = 8 Kg. m/s

b) In order to get the change in momentum, we need to get first the final speed of the object.

As we have the total distance travelled, and we could find the acceleration, we could use a kinematic equation to solve the question, but later we will need the kinetic energy, it would be better to apply the work-energy theorem, and calculate ΔK as the work done by external force F, as follows:

ΔK = F . d = 1/2 m (vf² - v₀²)

As we know F, d, m, and v₀, we can solve the equation above for vf:

vf = 12 m/s

So, we can compute the final momentum as follows:

pf = m. vf = 2 Kg. 12 m/s = 24 Kg. m/s

Finally, we can find the change in momentum, as the difference between the final momentum and the initial one, calculated in a):

Δp = pf - pi = 24 Kg. m/s - 8 Kg. m/s = 16 Kg. m/s

c) As we have already found, final momentum is as follows:

pf = m . vf = 2 Kg. 12 m/s = 24 Kg. m/s

d) By definition the initial kinetic energy of the box is as follows:

Ki = 1/2 m v₀² = 1/2. 2 Kg .4² m²/s² = 16 J

e) We can find the change in the kinetic energy taking directly the difference between the final and initial ones, as follows:

ΔK = Kf - Ki = 1/2. 2 Kg (12² - 4²) m²/s² = 128 J

f) From above, we have Kf = 1/2 m. vf² = 1/2 . 2 Kg. 12² m²/s² = 144 J

g) As we know the magnitude of F, and the value of m, we can find the acceleration (assumed constant) , applying Newton's Second Law, as follows:

Fext = m .a ⇒ a = F/m = 4 N / 2 Kg = 2 m/s²

Appying the definition of acceleration, we can solve for t, as follows:

t = (vf-v₀) / a = (12 m/s - 4 m/s) / 2 m/s² = 4 s

6 0
3 years ago
What is weight if m is mass and g is gravitational force.
Nataly_w [17]
Weight is a force, and is defined as mass times acceleration. So (g is acceleration and m is mass):
F_g=mg

That's your answer.
7 0
3 years ago
Other questions:
  • 3. How many valence electrons are in the outermost energy level of each of the following elements?
    10·1 answer
  • Which formula can be used to calculate the horizontal displacement of a horizontally launched projectile?
    6·1 answer
  • What mass of silver (in grams) is solidified when 749 joules of heat are released by a sample of molten silver at its freezing p
    7·2 answers
  • Which is the hottest planet in the solar system
    14·2 answers
  • A pendulum is raised to a height of 0.3m above its lowest point and released. What is the velocity of the pendulum at its lowest
    11·1 answer
  • Students are investigating the rocks with fossil markings that are found in an area that was once covered by a lake. The rocks t
    13·2 answers
  • What is the mass of a baseball thrown at 25 m/s resulting in a momentum
    7·1 answer
  • A person observes a firework display for A safe distance of .750 km. Assuming that sound travels at 340 m/s in air what is the t
    12·1 answer
  • By how many times will the kinetic energy of a body increase if its speed is tripled? Show by calculation .​
    11·1 answer
  • Suppose the velocity of an object moving along a line is positive. are position, displacement, and distance traveled equal? expl
    13·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!