Physical Science Eoct

What energy transformation results from fusion reactions in stars?

• Nuclear energy changes to electromagnetic energy.

• Nuclear energy changes to chemical energy.

• Nuclear energy changes to sound energy.

• Nuclear energy changes to electrical energy.

Tags

NGSS.HS-ESS1-1

Why is it dangerous to leave an animal in a car with the windows closed in bright sunlight?

• The air inside the car will absorb heat energy through conduction from the sun, increasing the temperature inside the car.

• The air in the car will become dangerously cold as heat energy is transferred out of the car by radiation.

• The temperature inside the car will remain equal to the air temperature outside due to a state of equilibrium that could be dangerous.

• The air inside the car will absorb and hold radiant heat energy from the sun, increasing the temperature inside the car.

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-4

A substance heats and cools quickly. What do you know about this substance?

• It has a low specific heat capacity.

• It has a high specific heat capacity.

• It is undergoing a phase change.

• It is most likely water.

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-4

A teacher left a cup of hot coffee at 80°C out on the counter. After an hour, the coffee had reached room temperature of 20°C. Which description of particle motion explains this phenomenon?

• The particles of hot coffee absorbed cold from the particles of air in the room.

• The particles of hot coffee absorbed thermal energy from the particles of air in the room.

• The particles of hot coffee transferred cold energy to the particles of air in the room.

• The particles of hot coffee transferred heat energy to the particles of air in the room.

Tags

NGSS.MS-PS1-4

How much heat is gained when 100 g of glass warms 15°C, given a specific heat of 840 J/kg °C? Use the formula Q = mc∆T.

• 12.6 J

• 126 J

• 1260 J

• 12600 J

Tags

NGSS.MS-PS3-4

A child pushes a skateboard across a floor. What happens to some of the mechanical energy of the skateboard as it slows down and comes to a stop?

• It disappears.

• It is transformed into heat energy.

• It is transformed into potential energy.

• It remains as kinetic energy.

Tags

NGSS.MS-PS3-5

In 1 hour, a bicyclist travels 10 km north and then 6 km south. What is the average velocity of the bicyclist?

• 4 km/h

• 4 km/h north

• 16 km/h

• 16 km/h north

What is the mass of a 70-kg astronaut floating in space?

• 0 kg

• 7.14 kg

• 70 kg

• 686 kg

Which object has the most work done to it?

• a 10 N box lifted 1 meter

• a 50 N motorcycle lifted 0.1 meters

• a 4 N book lifted 2.0 meters

• a 5000 N car parked in the driveway

A car travels 30 km north in 2 hours. What are the average speed and velocity of the car?

• Speed = 15 km/h; velocity = 15 km/h north

• Speed = 15 km/h; velocity = 15 km north

• Speed = 30 km/h; velocity = 30 km/h north

• Speed = 60 km/h; velocity = 30 km north