Is it possible for an object to have a constant speed but be accelerating?

Yes.  'Acceleration' does NOT mean speeding up.

Acceleration means any change in the speed or direction of motion.
Speeding up, slowing down, or rounding a curve are all accelerations.

Any object that's not moving in a straight line is accelerating, even if
its speed is constant.  

-- Your car is accelerating when you drive 30 mph along a curved road.

-- You're accelerating on a merry-go-round (carousel) or a ferris wheel
when it's speeding up, slowing down, or turning at a constant rate.

-- Your car is accelerating when you see a red light and step on the brakes.

-- You are accelerating when you jog around a circular track at gym.

1) when you rub your hands together quickly, the kinetic energy is converted to mechanical energy.2) thermal energy from the sun travels to earth as infrared waves.3) energy is transferred through the matter of space by electromagnetic waves. 4) when a match is burned, chemical potential energy is converted to thermal and radiant energy. 5) seismicwaves are caused by back and forth movement , or vibration, of an object. 6) mechanicalenergy in an engine changes thermal energy into kinetic energy to make a car move.