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The blades of a toy helicopter spin when its circuit is connected to a battery. Which sequence below correctly identifies the energy changes taking place in the helicopter?
chemical to electrical to potential
chemical to electrical to mechanical
Which of the following gadgets best shows the transformation of energy from electrical to mechanical with the correct reasoning?
A light bulb because electricity is being used to create light and heat.
A fan because electricity is being used to spin the blades of the fan.
Two students place three ice cubes in a glass of water that was at room temperature. Which of the following scenarios would best describe the results of the investigation?
Energy from the water will transfer to the ice cubes, causing the ice to melt.
Cold from the ice cubes will transfer to the water, causing the water to cool.
A student decides to take up diving as a hobby. He stands on a high-dive that is 4m tall. If the student has a mass of 50 kg, what is his PE? Use the following equation to solve:g = 9.8 m/s/s
Choose the image below that shows potential energy decreasing then increasing if following the arrows from left to right?
Choose the statement below that best describes the transfer of energy from the Sun to the Earth.
The sun is the ultimate source of energy because it uses nuclear fusion to create heat. The thermal energy it creates radiates through the vacuum of space and heats the Earth.
The Sun is an extremely large source of thermal energy. Because of its size, the Sun can conduct its heat through space, heating the Earth.
A girl is riding her bike at a speed of 12 m/s. The girl and her bike have a combined mass of 77 kg. What is the KE of the girl and her bike? Use the formula:
If 200 J of energy were added to 1 g each of aluminum and copper, which would experience the LEAST temperature increase. Refer to the formula below:
Aluminum (c = 0.9 J/g C), because the higher the value for specific heat, the more energy is required for temperature change.
Copper (c = 0.39 J/g C), because the lower the value for specific heat, the more energy is required for temperature change.
A large cup of ice is poured into a glass pitcher of freshly brewed hot tea. The ice melts quickly and the tea in the glass pitcher gets much colder. If we wait twenty-four hours, what temperature would we expect the tea and ice mixture to reach?
The tea transferred energy to the ice making it melt. The mixture will be the temperature of the hot tea.
The tea transferred energy to the ice until they had equal amounts of energy. They will reach a temperature somewhere between each of their original temperatures.
Look at the images below and choose the one that represents and endothermic change in which water freezes.
During a lab investigation, energy was removed from two different materials.
Material A had a temperature change of
Material A has a lower specific heat value than B because it had the least change in temperature.
Material B has a lower specific heat value than material A because it showed the greatest change in temperature.
The mako shark has the ability to swim at a speed of 14 m/s. This can allow it to jump 9 m into the air. If a mako shark had a KE of 8,820 J, what was its mass?
Use the following formula: