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A child and a bike have a combined mass of 45kg The child rides the bike 1.8m in 10 sec at a constant speed What is the kinetic energy?
Wiki User
∙ 13y ago
Kinetic energy = 1/2MV2. M = 45kg, V = 0.18 meters/sec, so KE = 0.73 Joules
Wiki User
∙ 13y ago
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If A child rides her bicycle in her level driveway . what form of energy does she posses?
kinetic
Describe the motion of a child on a swing using kinetic and potential energy?
When the child is up in the air on either side of the climax of the swing, it builds potential energy to drop or swing back down towards the other side. When the child falls, gravity and the potential energy work together to make the child fall, and in turn, the kinetic energy not used for the fall goes into pushing the child back up on the other side. Say that there was no gravity involved in this situation. The child would only make it to the bottom of the swing, closest to the ground, because the amount of energy you store up in going higher cannot be amounted to greater as you swing down.
What is the kinetic energy of a 35kg child running at a speed of 1 m's across the yard to tag his friend?
Kinetic Energy = 1/2 * mass * velocity squared KE = 1/2mV2 KE = 1/2(35 kg)(1 m/s)2 = 18 Joules ========
A 21.2 kg child descends a slide 3.5 m high and reaches the bottom with a speed of 2.1 ms How much thermal energy due to friction was generated in this process?
The potential energy he lost on the descent = M g H = (21.2) (9.8) (3.5) = 727.16 joulesThe kinetic energy he had at the bottom = 1/2 M V2 = (0.5) (21.2) (2.1)2 = 46.746 joulesThe missing energy = (727.16 - 46.746) = 680.414 joules caused heating of the slide and the kid's pants.
What kinds of problems might arise from an older child trying to raise a younger?
If an older child is raising their younger sibling on a fairly constant basis it robs the older child of their private lives with friends and doing things that they should be doing in order to look back on life full of memories of their childhood. Often the older child may come resentful if they are looked upon as a constant babysitter. If the parents are not around and the older sibling is under the age of 18 (no longer a minor) then relatives should be brought in to help look after both of them.
How do you transfer your potential energy into another persons kinetic energy?
Whist standing still you could push someone on skates so that they move and have kinetic energy. You are transferring your muscular potential energy into their kinetic energy. Another example would be pushing a child on a swing.
If A child rides her bicycle in her level driveway . what form of energy does she posses?
kinetic
Changes in energy when a child slides down a slide?
At the top of the slide, the child has a bunch of potential energy. Potential energy becomes converted to kinetic energy as the child accelerates down the slide. At the bottom of the slide, your science teacher will say that all potential energy is converted to kinetic.If your looking to be more technical, some kinetic energy will become heat along the length of the slide via friction. At the end of the slide, the child has to stop right? When the child lands on his feet, or face, the inelastic collision between his feet or face and the sand would produce more heat from kinetic energy. Then he will have neither potential nor kinetic energy, the heat he created would be dissipated into the air, sand, and slide as if everything is back to normal. But he might have some cuts and bruises if he did slide down face first.
When does a child on a slide have its maximum kinetic energy?
If the slide has no friction, then at the bottom of the slide. If it does then it's when the child is going the fastest.
When is the most energy stored in a trampoline?
The stored energy, also called potential energy, is at its maximum when the springs are stretched to the maximum and just about to propel the child upwards into the air. When the springs accelerate the child, potential energy is converted into kinetic energy as the child is thrown upwards. When the child is at the top of the jump, the child has the potential energy, and this is converted back into kinetic energy as the child falls. Energy is lost in friction and in air resistance, so the child's muscles have to supply some energy to keep the process going. Luckily the child has a very sophisticated inbuilt dynamic positioning system that allows him or her to keep on jumping continuously without even thinking about it.
Describe the motion of a child on a swing using kinetic and potential energy?
When the child is up in the air on either side of the climax of the swing, it builds potential energy to drop or swing back down towards the other side. When the child falls, gravity and the potential energy work together to make the child fall, and in turn, the kinetic energy not used for the fall goes into pushing the child back up on the other side. Say that there was no gravity involved in this situation. The child would only make it to the bottom of the swing, closest to the ground, because the amount of energy you store up in going higher cannot be amounted to greater as you swing down.
What situation does not involve Potential energy being changed into kinetic energy?
1) Kinetic energy being turned back into potential energy. Look at a child on a swing. As the swing lowers (and they speed up), that's potential to kinetic. As the swing reaches its peak and stops, that kinetic to potential. 2) Burning is chemical energy being turned into heat and light. 3) In the Sun, nuclear fusion releases energy into heat and light.
On a playground slide a child has potential energy that decrease by 1000 J while her kinetic energy increases by 900 J What other form of energy is involved and how much?
There is also mechanical energy in this because a child resting on a slide is potentieal but also kinetic when she goes down the slide use this equation KE + PE = ME mechanical energy is the sum of kinetic and potentieal the amount depends probably in the middle half of 900 yes that is the answer simple physics hope that helped!
What are some objects that have kinetic energy?
Kinetic energy is the energy an object has due to its mass and its velocity. Kinetic energy is calculated with the equation: Ek = ½ mv² Since kinetic energy is proportional to mass and velocity, any object moving very slowly has a small amount of kinetic energy. Also, any very small object normally has a small amount of kinetic energy. For example, a soccer ball rolling down a hill might have a relatively small amount of kinetic energy.
Which of the following is an example of kinetic energy?
A.A child riding a bicycle down the streeta car in motion has kinetic energy because, Kinetic energy is energy due to motion.
What is the kinetic energy of a 35kg child running at a speed of 1 m's across the yard to tag his friend?
Kinetic Energy = 1/2 * mass * velocity squared KE = 1/2mV2 KE = 1/2(35 kg)(1 m/s)2 = 18 Joules ========
When a child rides a skateboard down an inclined ramp when the skateboard gets to exactly onehalf the starting height the child's kinetic energy?
First off an assumption: dissipative forces are negligible - this means no energy goes into overcoming friction and air resistance. It also means that the total energy of the system "U" is a constant. The total energy is the sum of the kinetic and potential energies: U=Ke+Pe Potential energy is a function of height and mass, kinetic is a function of mass and velocity. So at the top when the skateboard isn't moving: Ke=1/2mv2 =0 as velocity =0 Pe=mgh U=Pe+0=mgh Where h is the full height of the ramp. Halfway down the ramp the height =h/2 so Pe=mgh/2 Remembering U must be the same as it was at the top of the ramp: U=mgh=Pe+Ke=mgh/2 +Ke So solving gives Ke=mgh/2.
