Energy, Heat and Density Quiz Inci

An apple of mass 100 g falls from a tree. It reaches a speed of 6 m/s before it lands on the ground. What is the gain of kinetic energy of the apple?

How much gravitational potential energy does a 500 g book gain when it is lifted up 1.5 m onto a shelf?

How much energy is transformed in a 2 kW kettle in two minutes?

How much energy is needed to raise the temperature of 3 kg of copper by 10°C?

The specific heat capacity for copper is 385 J/kg°C.

What is the equation for density?

• Mass × volume

• Volume ÷ mass

• Mass ÷ volume

The density of iron is 7.8 g/cm³, what is the mass of 5 cm³ of it?

How much energy is needed to raise the temperature of 500 g of lead by 10°C? (c = 129 J/kg°C)

How much energy is needed to turn 100 g of oxygen gas into a liquid at the same temperature?

L = 213 kJ/kg

Amir investigates melting ice.

He puts ice cubes on different materials. He then measures the time taken for each ice cube to completely melt.

Calculate the thermal energy needed to melt 20 g of ice.

The specific latent heat of melting for ice is 334 000 J / kg.

Amir investigates melting ice.

He puts ice cubes on different materials. He then measures the time taken for each ice cube to completely melt.

Explain why the ice cubes take different times to melt on different materials.