Answer:
compound machine
Explanation:
A machine made of two or more simple machines is known as a compound machine.
They are usually derived by coupling or joining simple appliances together to make one compound device.
- This is done to increase mechanical advantage and to perform different tasks.
- Common examples are bicycles, shovels etc.
Answer:
Internal energy
Explanation:
Particles have two main energies that scientists acknowledge.
- The energy that is associated with their movement which we call kinetic energy. It is worth noting that particles have different kinetic energy, however the average kinetic energy that they have is directly proportional to temperature.
- The energy that is due to the interactive forces (attraction or repulsion) between particles is called potential energy
When these two types of energies are considered collectively, we call that internal energy
Answer:
Activation Energy is the Energy that Must be Overcome/reached by Reactants for Products to be formed.
I'd go with the 2nd Option.
Answer:
platinum-189 symbol is PT