Energy 1 Grade 7B

What is the speed of light

• 3,4 x 10^-19 m/s

• 34 x 10⁹ m/s

• 3 x 10⁸ m/s

• 3,4 x 10⁹ m/s

Examples of energy are......

• Light, thermal, wood, water

• Light, electrical, paper, sun

• Light, thermal, skin, sound

• Thermal, kinetic, sound, electrical

Stored energy is.....

• Kinetic energy

• moved energy

• Potential energy

• Electrical energu

Cooked pasta is 210 KJ/gr = .......KCal/Kg

• 140.000

• 230.000

• 50.000

• 65.000

If 20 N/m spring is stretched 2,5 metres from its rest position, what is potential energy stored in the spring?

• 62,5 J

• 60,6 J

• 60 J

• 6,5 J

A box that has a mass 35 kg is held above the ground, if the gravitational potential energy of the box in this position is 1785 J, what is the vertical distance between the box and the ground

A book with a mass of 12 kg is placed on a bookcase that has a height of 25 dm. How much gravitational potential energy does it possess

• 298 J

• 294 J

• 290 J

• 295 J

An object that has a mass of x Kg is 10 m above a building, if the object has a potential energy of 120 J, what is the value of X

• 15 Kg
• 12.2 Kg

• 5 Kg
• 30 Kg

A spring is given a weight so that it has a change in length of 20 cm. The elastic energy that occurs in the spring is 40, calculate how much the spring constant is.

• 1000 N/m

• 6000 N/m

• 2000 N/m

• 4000 N/m

Energy the stored in charged particles within an electric field is called

• Thermal energy
• Electric potential energy
• Nuclear energy
• Kinetic energy