SCIdasdas

What unit do scientists use to measure power?

• Watt

• Joule

• Kelvin

• Newton

Which type of energy doesn’t require a medium?

• EMR

• Thermal

• All

• Chemical

woman lifts a 6.63kg plant 2 meters. How much work does she do?

• 130.08J

• 32.50 J

• 13.26 J

• 3.32 J

The law of conservation of energy applies to:

• Energy transfers but not energy transformations

• Energy transformations but not energy transfers

• Both energy transfers and energy transformations

• d. Neither energy transfers nor energy transformations

Sound energy is considered a type of:

• EMR

• Thermal energy

• c. Potential energy

• . Mechanical energy

What type of energy is represented by the food we eat?

• a. Thermal

• al b. EMR

• Chemical

• Nuclear

When energy changes from one form to another form, the total amount of energy in the system

• Increase

• Decrease

• Same

• Varies

What determines an object’s kinetic energy?

• Mass and force

• Mass and distance

• d. Speed and mass

• c. Speed and force

An object is lifted 10m above ground and is unmoving. What statement is true?

• The object has mechanical energy

• The object does not have mechanical energy

• The object has some potential energy but no mechanical energy

• The object has some kinetic energy but no mechanical energy

What is the kinetic energy of a 40kg person running at 3m/sec?

• 60

• 180

• 120

• 360