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- Multiple ChoicePlease save your changes before editing any questions.
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
- Multiple ChoicePlease save your changes before editing any questions.
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.
- Multiple ChoicePlease save your changes before editing any questions.
1. A hot (100 °C) bolt with a mass of 71 grams is placed in 150 grams of cool (20 °C) water.
This diagram shows the resulting temperature changes. The specific heat of water is 4.184 J/g × °C.
Approximately how many joules of heat did the water absorb?
(Heat Lost or Gained = Mass × Specific Heat × Change in Temperature) (Q = m c ΔT)
2,510.40 J
1,118.26 J
1,506.24 J
22,191.94 J
- Multiple ChoicePlease save your changes before editing any questions.
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.
- Multiple ChoicePlease save your changes before editing any questions.
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.
- Multiple ChoicePlease save your changes before editing any questions.
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/s1960 J
200 J
- Multiple ChoicePlease save your changes before editing any questions.
1. A student investigated the energy transformations that occur when a call is placed from cell phone A and received by cell phone B. The student drew a diagram to show the process. Based on the diagram, what evidence is there for the transformation of chemical energy into electrical energy, and which other energy transformations must occur for the call to be received by cell phone B?
Evidence:
Cell phones are powered by a battery that produces the electricity used to send or receive a call.
Transformation 1: Sound energy is transformed into
electrical energy by cell phone A.
Transformation 2: Electrical energy is transformed into mechanical energy in the cell towers and base station
Evidence:
Cell phones are powered by a battery that produces the electricity used to send or receive a call.
Transformation 1: Sound energy is transformed into
electromagnetic waves by cell phone A.
Transformation 2: Electromagnetic waves are transformed back into sound energy by cell phone B.
Evidence:
Base stations are powered by a battery that produces the electricity used to receive and forward a call.
Transformation 1: Sound energy is transformed into electrical energy by cell phone A.
Transformation 2: Electrical energy is transformed into mechanical energy in the cell towers and base station
Evidence:
Base stations are powered by a battery that produces the electricity used to receive and forward a call.
Transformation 1: Sound energy is transformed into electromagnetic waves by cell phone A.
Transformation 2: Electromagnetic waves are transformed back into sound energy by cell phone B
- Multiple ChoicePlease save your changes before editing any questions.
Choose the image below that shows potential energy decreasing then increasing if following the arrows from left to right?
- Multiple ChoicePlease save your changes before editing any questions.
1. Using the image identify the three forms of heat transfer.
Conduction (CD), Convection (CV) Radiation (R).
A: CD - B: CV - C: R
A: R - B: CD - C: CV
A: CV - B: CD - C: R
A: R - B: CV - C: CD
- Multiple ChoicePlease save your changes before editing any questions.
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.
- Multiple ChoicePlease save your changes before editing any questions.
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:
1078 J
5544 J
- Multiple ChoicePlease save your changes before editing any questions.
1. A student is investigating the motion of a pendulum. The student holds the Bob in Point A and then releases it. Which statement is correct about the energy of the Bob?
The KE of the Bob is greatest at Point A.
KE changes to PE as the Bob moves from D to E.
The PE of the Bob is greatest at Point C.
PE changes to KE as the Bob moves from C to D.
- Multiple ChoicePlease save your changes before editing any questions.
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.
- Multiple ChoicePlease save your changes before editing any questions.
Look at the images below and choose the one that represents a change in which water freezes.
- Multiple ChoicePlease save your changes before editing any questions.
During a lab investigation, energy was removed from two different materials.
Material A had a temperature change of
Material B had a temperature change of
Which conclusion about the specific heat of the materials is best supported by this information?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.
- Multiple ChoicePlease save your changes before editing any questions.
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:
150 kg
90 kg
- Multiple ChoicePlease save your changes before editing any questions.
Where would an object have the most potential energy?
The bottom of a hill
The top of the hill
On the way down the hill
It never has potential energy
- Multiple ChoicePlease save your changes before editing any questions.
How does a windmill change forms of energy?
Mechanical to electrical
Electrical to mechanical
Mechanical to light
It is unable to change forms
- Multiple ChoicePlease save your changes before editing any questions.
If you have a battery in a device, what is the first energy transformation that must happen?
Chemical to light
Chemical to electrical
Electrical to chemical
Electrical to light
- Multiple ChoicePlease save your changes before editing any questions.
Which statement correctly compares the difference between conduction and convection in a classroom?
Conduction can only occur in solids, while convection
can occur in both liquids and gases.
Convection can only occur in solids, while conduction
can occur in both liquids and gases.
Conduction can only occur in liquids and gases, while
convection can occur in solids, liquids, and gases.
Convection can only occur in liquids and gases, while
conduction can occur in solids, liquids, and gases.