The amount of energy needed to increase the temperature of a substance by
is given by
where
m is the mass of the substance
is its specific heat capacity
is the increase in temperature
The water volume is
, since its density is
, the mass of this sample of water is
The water specific heat capacity is
and the increase in temperature is
Therefore, the amount of energy needed is
the answer is A *but I am not sure*
Answer:
Focal length is 12 cm
Nature is Convex lens
Explanation:
Object distance=p= 10 cm
Image distance =q = -60 cm (Image is at the same side)
focal length= f = ?
According to lens equation
1/f = 1/p + 1/q
1/f = 1/10 + 1/(-60)
1/f = 1/10 - 1/60
1/f = 5/60
or
f= 12 cm
(It is a convex lens because focal length is positive)
Answer:0.246 m
Explanation:
Given
height of window (h)=1 m
Time to pass window =0.28 s
Let roof is at a distance of 
above window
let t be the time to cover
------1
--------2
subtract 1 & 2
![1=\frac{g}{2}\left [ \left ( 2t+0.28\right )\left ( 0.28\right )\right ]](https://tex.z-dn.net/?f=1%3D%5Cfrac%7Bg%7D%7B2%7D%5Cleft%20%5B%20%5Cleft%20%28%202t%2B0.28%5Cright%20%29%5Cleft%20%28%200.28%5Cright%20%29%5Cright%20%5D)
t=0.224 s
Answer:
A)
Explanation:
Inside your CD player, there is a miniature laser beam called a semiconductor diode laser and a small photoelectric cell an electronic light detector. The laser flashes up onto the shiny side of the CD, bouncing off the pattern of pits and lands on the disc.
