exam guide 2

Max's work on the wall

None, as no distance was moved despite the force applied.

Action-reaction pair (Newton's law)

The table pushing up on the book and the book pushing down on the table.

Forward drive force on an auto moving at 50 mph

The forward push by the road on the tires.

Net force direction on the moon as it circles Earth

Directed inward toward Earth.

Similarity between a falling apple and the moon

Both have forces toward Earth’s center and accelerations directed toward Earth's center.

Condition for force to do no work

If the object does not move.

Work done lifting a 3 N apple by 2 m

6 J.

Outcome of Samantha's space trip in terms of aging

Samuel is older than Samantha.

Gravitational ‘force’ according to Einstein’s theory

Results from the warping of space-time by an object.

Source of 'one-way' nature of time

The second law of thermodynamics.

Three main types of radiation from the sun

Infra-red, visible, and ultra-violet.

Efficiency of a heat engine

Work output divided by thermal energy input.

Origin of all magnetic forces

Charges in motion.

Gravity is equivalent to according to the principle of equivalence

Acceleration.

Different colors correspond to different electromagnetic wave properties

Frequencies.

Observation of a laser beam by Sonja

The laser beam moves past her at 300,000 km/s.

Why we don’t feel electric forces from matter

Ordinary matter contains equal numbers of electrons and protons.

How a radio station transmits a signal

Electrons moving in the antenna emit electromagnetic waves that convert to sound waves.

Thermal energy flow when touching ice

Flows from your hand to the ice.

Rutherford's experiments demonstrated that

The atom contains a tiny nucleus with most of its mass.

Effect of a current flowing through a wire

Creates a magnetic field circulating around the wire.

Effects observed in a spaceship moving at near lightspeed

Mass increases, pulse rate slows down, size reduces along the direction of motion.

Light behavior through a double slit

Constructive interference occurs where crests align.

Role of the magnet in the Electric Motor mini-lab

Applies a sideways force only when current flows in the wire.

Relationship expressed by E = mc^2

Applies to all forms of energy.

14C content of saber-toothed tiger remains after 24,000 years

1/16 gram.

Non-example of a heat engine

Hydro-electric generating plant.

Reason ultraviolet light damages skin cells

Ultraviolet photons have more energy than visible light.

Isotope that sustains a fission chain reaction

235U.

Shortest wavelength among particles with same speed

Electron.