A=f/m
A=900/425
A=2.18
To determine acceleration you divide the force by the mass.
#1). Anthony does the same amount of work as Angel, with <em>more power</em>.
#2). Power = (Work)/(Time) = 41,000 J / 500 s = <em>82 watts .</em>
#3). Power = (Work) / (Time) = 83 J / 3 sec = <em>27.7 watts</em>
When the magnets are released and begin to move, the magnetic force changes potential energy into kinetic energy;<u> option D</u>
<h3>What is magnetic force?</h3>
Magnetic force can be defined as the force of attraction or repulsion that is felt or produced between the magnetic poles and electrically charged moving particles.
Magnetic force is the force that exists due to the attractio or repulsion of objects place around the region of space where a maget exerts its force.
When a magnet is released ai a system of magnets and allowed to move it increases the kinetic eergy of the system by converting potential energy to kinetic energy.
Learn more about magnetic force at: brainly.com/question/28989998
#SPJ1
Answer:
The magnitude of the rate of change of the child's momentum is 794.11 N.
Explanation:
Given that,
Mass of child = 27 kg
Speed of child in horizontal = 10 m/s
Length = 3.40 m
There is a rate of change of the perpendicular component of momentum.
Centripetal force acts always towards the center.
We need to calculate the magnitude of the rate of change of the child's momentum
Using formula of momentum
![\dfrac{dp}{dt}=F](https://tex.z-dn.net/?f=%5Cdfrac%7Bdp%7D%7Bdt%7D%3DF)
![\dfrac{dP}{dt}=\dfrac{mv^2}{r}](https://tex.z-dn.net/?f=%5Cdfrac%7BdP%7D%7Bdt%7D%3D%5Cdfrac%7Bmv%5E2%7D%7Br%7D)
Put the value into the formula
![\dfrac{dP}{dt}=\dfrac{27\times10^2}{3.40}](https://tex.z-dn.net/?f=%5Cdfrac%7BdP%7D%7Bdt%7D%3D%5Cdfrac%7B27%5Ctimes10%5E2%7D%7B3.40%7D)
![\dfrac{dP}{dt}=794.11\ N](https://tex.z-dn.net/?f=%5Cdfrac%7BdP%7D%7Bdt%7D%3D794.11%5C%20N)
Hence, The magnitude of the rate of change of the child's momentum is 794.11 N.
A single fixed pulley can be used to raise or lower lightweight objects.
Option b
<u>Explanation:</u>
A pulley is a simple machine tool which is used to make lifting or lowering tasks easy. A single fixed pulley is a system involving only one pulley fixed on a constant rigid support with a rope wrapped around the wheel. Such a system can be used only to change the direction of applied force in raising or lowering small, lightweight objects which need minimal work force.
A single fixed pulley system helps only in redirecting the applied force direction by using a rope and wheel assembly. The work done in such a case remains the same and hence it is not preferred to use it in lifting heavy objects. Neither is the required force reduced in case of a single fixed pulley system. A movable pulley helps in achieving (A) and (C).