Lighting is a place where lots of energy can be saved
What will be an ideal response?
Lighting uses up to 7.5% of total energy use. Much energy (and money) can be
saved in lighting.
You might also like to view...
Some massive stars only live a few million years
Indicate whether the statement is true or false
A figure skater rotating at 5.00 rad/s with arms extended has a moment of inertia of 2.25 kg?m2. If the arms are pulled in so the moment of inertia decreases to 1.80 kg?m2, what is the final angular speed?
A) 2.25 rad/s B) 4.60 rad/s C) 6.25 rad/s D) 1.76 rad/s E) 0.81 rad/s
A 20-g bullet moving at 1000 m/s is fired through a one-kg block of wood emerging at a speed of 200 m/s. If the block had been originally at rest and is free to move, what is its resulting speed?
a. 800 m/s c. 16 m/s b. 80 m/s d. 8 m/s
To produce an "A" note (440. Hz) at 20.°C, a saxophone must create how long an effective air column?
A) 78. cm B) 39. cm C) 20. cm D) 66. cm E) 59. cm