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MaRussiya [10]
3 years ago
10

Helpppp guys plsss help !

Physics
2 answers:
Vinil7 [7]3 years ago
5 0

Answer:

2

Explanation:

Salsk061 [2.6K]3 years ago
3 0

Answer:

with what? I can help but with what

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A water heater warms 35 l of water from a temperature of 22.7 c to a temperature of 83.7
fgiga [73]
The amount of energy needed to increase the temperature of a substance by \Delta T is given by
Q=m C_s \Delta T
where
m is the mass of the substance
C_s is its specific heat capacity
\Delta T is the increase in temperature

The water volume is V=35 L= 35 dm^3 = 0.035 m^3, since its density is d=1000 kg/m^3, the mass of this sample of water is
m=dV=(1000 kg/m^3)(0.035 m^3)=35 kg

The water specific heat capacity is C_s = 4.18 kJ/kg ^{\circ}C

and the increase in temperature is \Delta T=83.7 ^{\circ}C-22.7 ^{\circ}C=61^{\circ}C

Therefore, the amount of energy needed is
Q=mC_s \Delta T=(35 kg)(4.18 kJ/kg ^{\circ}C)(61^{\circ}C)=8924 kJ = 8.92 \cdot 10^6 J
8 0
4 years ago
A reaction in a solution would proceed slowest when -
Zinaida [17]

the answer is A *but I am not sure*

6 0
3 years ago
An object is placed in front of a lens at 10cm from its optic centre.The image is seen on the same side of lens at 60cm distance
shusha [124]

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)

7 0
3 years ago
A roof tile falls from rest from the top of a building. An observer inside the building notices that it takes 0.28 s for the til
PIT_PIT [208]

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 h_0 above window

let t be the time to cover h_0

h_0+1=\frac{g(t+0.28)^2}{2}------1

h_0=\frac{gt^2}{2}--------2

subtract 1 & 2

1=\frac{g(t+0.28)^2}{2}-\frac{gt^2}{2}

1=\frac{g}{2}\left [ \left ( 2t+0.28\right )\left ( 0.28\right )\right ]

t=0.224 s

h_0=\frac{9.8\times 0.224^2}{2}

h_0=0.246 m

5 0
3 years ago
A laser is used to make a CD or DVD by _____.
boyakko [2]

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.

7 0
3 years ago
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