Mechanical energy

Regarding to sound, what is a vacuum?

• A machine use to clean the house

• A medium in which sound cannot propagate

• A medium in which sound is able to propagate

• Non of the above

Is the ability of something to cause change in itself or other things

• Energy

• Sound

• Friction

• Motion

Tags

NGSS.MS-PS3-4

Is the energy associated with the chemical bonds that link atoms in a pure susbtance.

• Thermal energy

• Chemical energy

• Electrical energy

• Potencial energy

We have two object, A and B, in isolation. If object B gains 500 J, what must have happened to body A?

• The energy gained by object B its depends on the temperature

• The energy gained by object B must be more as the energy lost by object A

• The energy gained by object B must be the same as the energy lost by object A

• None of the above.

What mechanical energy does a 900 kg airplane have if it flies at 360 km/h and 1 km high?

•    $13.32\cdot10^6\ Joules$ 

•  $11.30\cdot10^{2^{ }}Joules$ 

•  $11.5\cdot10^3\ Joules$ 

•  $9\cdot10^5$ 

Is the energy associated with changes in atomic nuclei

• Thermal energy

• Atomic energy

• Nuclear energy

• None of the above

Starts are giant burning balls of incandecent gas, or plasma, heated by thr large amount of energy from...

• Nuclear fusion

• Nuclear fission

• Thermal energy

• Atomic energy

They transform the mechanical energy of matter into thermal energy

• Dissipative forces

• Conservation of mechanical energy

• Heat

• None of the above

The potential energy of an object increases 50 J. If there is no friction, how much kinetic energy has tranformed?

• 100 JOULES

• 50 JOLUES

• 50 JOULES

• 200 JOULES

Tags

NGSS.HS-PS3-1

NGSS.HS-PS3-2

A 50 kg object sits on the roof of a 25 m building. If we neglect friction, at what velocity will it hit the ground if it falls freely?

• 22.14 m/s

• 45 km/h

• 29.56 m/s

• None of the above

Tags

NGSS.HS-PS2-1

NGSS.HS-PS2-4