What is a simple machine?

a.
any object that makes work easier when a single force is applied by changing the strength or the direction of that force

b.
any combination of objects that magnifies the input force so that the output force is greater

c.
any object or group of objects, that when connected to a source of electricity, make work easier

d.
any object, that when connected to a fossil fuel source, makes work easier

what was the acceleration of the 2 kg cart?

⇒ 16.0 cm/s2

what was the acceleration of the 4 kg cart?

⇒ 8.1 cm/s2

what was the acceleration of the 6 kg cart?

⇒ 5.3 cm/s2

  the unit of the measure =

explanation:

  the property that is quantified by the energy needed per of material to raise the temperature by one.

  si unit of energy = joule (j)

  si unit of temperature = kelvin (k)

  si unit of mass of material = kilogram (kg)

the property that is quantified by the energy needed per of material to raise the temperature by one is called specific heat.

the unit of specific heat is

electric field is a function of 1/r^2

yes, the force per unit charge for a point charge is inverse square law.