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
mestny [16]
3 years ago
15

A 25-kg child sits at the top of a 4-meter slide. After sliding down, the child is traveling at 5 m/s. How much PE does he start

with? How much KE does he end with? How much energy is lost to friction?
Physics
1 answer:
Semmy [17]3 years ago
4 0

Daniddmelo says it right there, don't know why he got reported.

The potential energy (PE) is mass x height x gravity. So it would be 25 kg x 4  m x 9.8 = 980 joules. The child starts out with 980 joules of potential energy. The kinetic energy (KE) is (1/2) x mass x velocity squared. KE = (1/2) x 25 kg x 5 m/s2 = 312.5 joules. So he ends with 312.5 joules of kinetic energy. The Energy lost to friction =  PE - KE. 980- 312.5 = 667.5 joules of energy lost to friction.

Please don't just copy and paste, and thank you Dan cause you practically did it I just... elaborated more? I dunno. 

You might be interested in
Scientists studying an anomalous magnetic field find that it is inducing a circular electric field in a plane perpendicular to t
yarga [219]

Answer

The rate at which the magnetic field is changing is  [\frac{dB}{dt} ] =  0.000467 T/s

Explanation

From the question we are told that

   The electric field strength is E =  3.5mV/m =  3.5 *10^{-3} \ V/m

    The radius is  r =  1.5 \ m

The rate of change of the  magnetic  field  is mathematically represented as

        \frac{d \phi }{dt}  =  \int\limits^{} {E \cdot dl}

Where dl is change of a unit length

     \frac{d \phi}{dt}  =  A *  \frac{dB}{dt}

Where A is the area which is mathematically represented as

     A = \pi r^2

    So

    E \int\limits^{} {  dl} =  ( \pi r^2) (\frac{dB}{dt} )  

  E L  =  ( \pi r^2) (\frac{dB}{dt} )  

where L is the circumference of the circle which is mathematically represented as

     L = 2 \pi r

So

     E (2 \pi r ) =  (\pi r^2 ) [\frac{dB}{dt} ]

      E  =   \frac{r}{2}  [\frac{dB}{dt} ]

       [\frac{dB}{dt} ] = \frac{E}{ \frac{r}{2} }

substituting values

      [\frac{dB}{dt} ] = \frac{3.5 *10^{-3}}{ \frac{15}{2} }

      [\frac{dB}{dt} ] =  0.000467 T/s    

8 0
3 years ago
What is the difference between a good conductor and a good insulator?
brilliants [131]

Answer:

Explanation:

In a conductor, electric current can flow freely, in an insulator it cannot.

Metals such as copper typify conductors, while most non-metallic solids are said to be good insulators, having extremely high resistance to the flow of charge through them.

Most atoms hold on to their electrons tightly and are insulators.

4 0
3 years ago
Will Mark Brainliest
almond37 [142]

Answer:

2s worth of falling up

Explanation:

7 0
3 years ago
Read 2 more answers
The pulley system has a mechanical advantage of 5. Determine how much input force is required to achieve 1000 N of lifting force
Katen [24]
I don’t think I need anything from my dad to get my hair fixed so I’m just bored I don’t want you guys
8 0
2 years ago
Which changes in an electric motor will make the motor stronger? Check all that apply. using a stronger permanent magnet using a
miv72 [106K]
Use stronger magnets
increase current
push magnets closer to coil
adding more sets of coils
4 0
3 years ago
Read 2 more answers
Other questions:
  • On a good night, the front row of the Twisted Sister concert would surely result in a 120 dB sound level. An IPod produces 100 d
    6·1 answer
  • Which theory proposed by Galileo is considered a “big mistake of his life”? What did the theory state, and why was it a “big mis
    5·2 answers
  • Magnetic field lines surrounding a magnet are conventionally drawn
    7·2 answers
  • A middle-aged man typically has poorer hearing than a middle-aged woman. In one case a woman can just begin to hear a musical to
    7·1 answer
  • ALWAYS use significant figure rules. Remember that these rules apply to all numbers that are measurements.
    6·2 answers
  • Which statement best describes a scientific law?
    5·1 answer
  • When two plates of the same density collide, what will most likely happen?
    7·1 answer
  • I need help with number 2 pls it’s a quiz grade
    5·1 answer
  • If time is tripled and work remains the same the power will.​
    12·1 answer
  • What is the helmet for
    10·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!