A bar magnet cut in half will form a total of

poles.

a) four

b) eight

c) two

What must you do before you make a hypothesis? a) Run the experiment b) Research information about your question. c) Form a theory. d) Draw conclusions

What factor affect work? Explain

Radio waves coming from a radio station are tuned into by a student in class. What form of energy transfer does the radio station model?

X (t) = 20-4t² then what is average Velocity in between t = 0 and t=20sec

If you charge a pocket comb by rubbing it with a silk scarf, how can you determine if the comb is positively or negatively charged?

A proton accelerates from rest in a uniform electric field of 610 N/C. At some later time, its speed is 1.4 106 m/s. (a) Find the magnitude of the acceleration of the proton.

What does the law of conservation of matter state?

Heat flows due to: Select one: a. conduction b. convection c. radiation d. all of the above

A mine elevator is supported by a single steel cable 0.0125 m in diameter. The total mass of the elevator cage and occupants is 6450 kg. By how much does the cable stretch when the elevator hangs by 362 m of cable? (Neglect the mass of the cable.

Express the displacement Δy of an object travelling with acceleration a during a time period Δt that has an initial velocity vi.