Can all the hills on a roller coaster be the same height? If not, why?

What type of light does this light bulb produce most (i.e. at what wavelength does the spectrum have maximum intensity)?

Why is it important always to use horizontal bars in unit fractions when performing unit conversions?

As a pendulum bob swings back and forth several times, the maximum height it reaches becomes less and less. this is because more and more of the pendulum bob's energy is being transformed into a. heat energy b. kinetic energy c. potential energy d. kinetic energy and potential energy