TUTORIAL Questions 442-448

 

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 Questions:

442. Work up stairs
444. Relative power of two lights
445. Number of physicsts
446. Light Intensity
448. Sound intensity and amplitude
 

442. How much work is done in carrying a 10 kg baby up a flight of stairs whose top step is 6 meters vertically above the bottom floor?

a) 60 Joules
b) 600 Joules
c) Cannot tell from information given.
d) None

Fundamentals of Sound reference: Sec. 10-A.

 

444. Light Bulb A produces 100 Joules of energy in 5 seconds. Light Bulb B, of the same type, produces 50 Joules in 2 seconds. Which bulb is brighter?

a) A
b) B
c) they are the same brightness

Fundamentals of Sound reference: Sec. 10-F.

 

 

445. How many physicists does it take to screw in a lightbulb?

a) one
b) two
c) three

 

 

446. Light Bulbs A of Question 444 is concentrated by a lens and mirror to a spot of area 2 cm2. Bulb B is concentrated to an area of 5 cm2. Which spot is brighter?

a) A
b) B
c) Both are the same

Fundamentals of Sound reference: Sec. 10-G.
 

 

448. A sound wave has an intensity of 6 picowatts/m2. If its amplitude is tripled in size what is the resulting intensity? 

a) 18 picowatts/cm2
b) 54 picowatts/cm2
c) 108 picowatts/cm2
d) None of the above.

Fundamentals of Sound reference: Sec. 10-G.
 
 

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