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
REY [17]
2 years ago
15

If a 2 kg ball is traveling at 4 meters per second, what is its kinetic energy?

Physics
2 answers:
lubasha [3.4K]2 years ago
7 0

Answer:

\displaystyle KE = 32 \ J

General Formulas and Concepts:

<u>Energy</u>

Kinetic Energy Formula: \displaystyle KE = \frac{1}{2}mv^2

  • <em>KE</em> is in J
  • <em>m</em> is in kg
  • <em>v</em> is in m/s

Explanation:

<u>Step 1: Define</u>

<em>Identify variables</em>

<em>m</em> = 2 kg

<em>v</em> = 4 m/s

<u>Step 2: Find KE</u>

  1. Substitute in variables [Kinetic Energy Formula]:                                          \displaystyle KE = (2 \ kg)(4 \ m/s)^2
  2. Simplify:                                                                                                            \displaystyle KE = 32 \ J

Topic: AP Physics 1 - Algebra Based

Unit: Energy

vlada-n [284]2 years ago
5 0

Answer:

16 J

Explanation:

You might be interested in
Type the correct answer in the box. Round your answer to the nearest whole number. Calculate the man’s mass. (Use PE = m × g × h
Blababa [14]

Answer:

56 kg

Explanation:

The change in potential energy of the man is given by:

\Delta U = mg \Delta h

where

m is the man's mass

g is the gravitational acceleration

\Delta h is the change in height of the man

In this problem, we have:

\Delta U=4620 J is the gain in potential energy

g = 9.8 m/s^2 is the gravitational acceleration

\Delta h=8.4 m is the change in height

Re-arranging the equation and substituting the numbers, we find the mass:

m=\frac{\Delta U}{g\Delta h}=\frac{4620 J}{(9.8 m/s^2)(8.4 m)}=56 kg

6 0
2 years ago
Read 2 more answers
Which statement correctly describes the relationship between frequency and wavelength?
liraira [26]

For a wave:

v = fλ

v is the velocity, f is the frequency, and λ is the wavelength.

Assuming the velocity of the wave doesn't change...

If you increase its frequency, its wavelength will shorten.

5 0
3 years ago
Read 2 more answers
An unusual fog that is denser than air begins to fill a room. Should the people in the room walk out or crwl out? The people sho
horsena [70]
Walk out. If it's denser than air, it'll settle to the bottom
8 0
2 years ago
A long uniformly charged thread (linear charge density λ= 2.5 C/m) lies along the x axis in the figure.(Figure 1) A small charge
Kamila [148]

Answer 1) The electric field at distance r from the thread is radial and has magnitude  

E = λ / (2 π ε° r)  

The electric field from the point charge usually is observed to follow coulomb's law:  

E = Q / (4  π ε° r^{2})  

Now, adding the two field vectors:  

E_{thread}  =  {2.5 / (22 π ε° X 0.07 ) ; 0}  

Answer 2) E_{q}  = {2.3 / (4 2 π ε°) ( - 7/ (√(84); -12 / (√84))

Adding these two vectors will give the length which is magnitude of the combined field.  

The y-component / x-component gives the tangent of the angle with the positive x-axes.

Please refer the graph and the attachment for better understanding.

5 0
2 years ago
An 85 kg man and his 35 kg daughter are sitting on opposite ends of a 3.00 m see-saw. The see-saw is anchored in the center. If
wolverine [178]

Answer:

0.54m

Explanation:

Step one:

given data

length of seesaw= 3m

mass of man m1= 85kg

weight = mg

W1= 85*10= 850N

mass of daughter m2= 35kg

W2= 35*10= 350N

distance from the center= (1.5-0.2)= 1.3m

Step two:

we know that the sum of clockwise moment equals the anticlockwise moment

let the distance the must sit to balance the system be x

taking moment about the center of the system

350*1.3=850*x

455=850x

divide both sides by  850

x=455/850

x=0.54

Hence the man must sit 0.54m from the right to balance the system

3 0
3 years ago
Other questions:
  • Give three examples of unbalanced forces in your everyday life. HELP FAST PLZ
    5·2 answers
  • Sallie's recipe calls for a total of cups of flour to make biscuits. It says to use cup of flour from the total for rolling out
    15·2 answers
  • Determine how potential and kinetic energy changes at each position of the pendulum as the ball swings from A to E. Position A:
    10·2 answers
  • Formation of a precipitate is usually evidence of?
    7·2 answers
  • Aspect of the physical world
    14·1 answer
  • The scientist who used a prism to study light was _____.
    6·2 answers
  • I NEED THIS ASAP
    11·2 answers
  • A Newtonian fluid with a viscosity  drains through the space between two large parallel plates as shown in the figure. The gap
    11·1 answer
  • What is 2f In concave mirrors?
    15·1 answer
  • Match the type of boundary with its characteristic.
    15·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!