Physics Energy Review

What is the work output of a machine that has a heat input of 2,800 Joules and an efficiency of 0.923?

• 2,690J

• 92.3J

• 0.0082J

• 2,584.4

Tags

NGSS.MS-PS3-4

NGSS.MS-PS3-5

Heat transfer within a fluid takes place by

• Convection

• Conduction

• Radiation

• Sublimation

Tags

NGSS.MS-PS1-4

Convection

• The transfer of thermal energy through liquids and gases

• The transfer of thermal energy through solids

• The transfer of thermal energy as electromagnetic waves

The slower molecules move, 

• the higher the temperature

• the less temperature

• the same temperature

• I don't know

Tags

NGSS.MS-PS1-4

Truck 1 is a 500-kg object traveling at a velocity of 35 m/s, and truck 2, is a 400-kg object traveling at a velocity of 40 m/s. Which object has a larger kinetic energy?

• Truck 1

• Truck 2

• The two trucks have the same kinetic energy

• Not enough info is provided

Tags

NGSS.MS-PS3-1

NGSS.MS-PS3-5

What is the potential energy of a ball, held at a height of 45 m, with a mass of 2-kg.

• U_g= 400 N

• U_g= 600 N

• U_g= 700 N

• U_g= 900 N

Tags

NGSS.MS-PS3-2

What is the equation for spring potential energy?

• U_s= (k)(x)²

• U_s= (k)(x)

• U_s= 1/2(k)(m)

• U_s= 1/2(k)(x)²

A stone is held at a height h above the ground. A second stone with six times the mass of the first stone is also held at height h. the gravitational potential energy of the second stone stone compared to the first one is...

• One-fourth as much

• Twice as much

• Three times as much

• Six times as much

Tags

NGSS.MS-PS3-2

Which of the following objects has the most kinetic energy?

• A 20 kg toddler running at 5 m/s

• A 50 kg toddler running at 30 m/s

• A 90 kg toddler running at 30 m/s

• A 100 kg toddler running at 2 m/s

Tags

NGSS.MS-PS3-1

Kinetic Energy is defined as

• Energy stored due to its location

• Energy of motion

• Energy stored in the bonds of molecules

• Heat energy