The calorie was originally defined as the amount of heat required at a pressure of 1 standard atmosphere to raise the temperature of 1 gram of water 1° Celsius. ... Since 1925 this calorie has been defined in terms of the joule, the definition since 1948 being that one calorie is equal to approximately 4.2 joules.
        
             
        
        
        
Magnitude of acceleration = (change of speed) / (time for the change) =
                                             (12 m/s  -  0)   /   (3 sec)  =
                                               12/3  =  <em>4 m/s²</em>
What's a challenge question ?  Have we all passed the event horizon 
and been spaghettified without knowing it ?
        
             
        
        
        
Answer:
first lens v = 48 cm
second lens v = -15.6 cm
magnification =  1.67
final image is virtual
and final image is upright
Explanation:
given data 
distance = 16 cm
focal length f1 = 12 cm
focal length f2 = 10.0 cm
to find out
location of the final image and magnification and Type of image
solution
we apply here lens formula that is
1/f = 1/v + 1/u     .....................1
put here all value and find v  for 1st lens
1/12 = 1/v + 1/16
v = 48 cm
and  find v  for 2nd lens
here u = 20- 48 = -28
- 1/10 = 1/v - 1/28
v = -15.6 cm
and
magnification = first lens (v/u) ×  second lens ( v/u)
magnification =  (-15.6/-28) ×  ( 48/16)
magnification =  1.67
so here final image is virtual
and final image is upright
 
        
             
        
        
        
Answer: Instantaneous speed is measured at each particular instant, and average speed is the sum of the instantaneous speeds.