When light moves from air into glass at an angle, is the light refracted toward or away from the normal?
1 answer:
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Answer:
0.9378
Explanation:
Weight (W) of the rider = 100 kg;
since 1 kg = 9.8067 N
100 kg will be = 980.67 N
W = 980.67 N
At the slope of 12%, the angle θ is calculated as:
The drag force D = Wsinθ
where;
A = 0.9 m²
V = 15 m/s
∴
Drag coefficient
Answer: Option (E)
Explanation:
There are only two forces acting on the car: The force of gravity, which point down, and the normal force generated by the interaction of the car and the ramp, which points perpendicular to the ramp.
,
:mass of the car ;
:angle of the ramp.
: gravity's acceleration.
is constante since all parameters are constants.
So, since the force of gravity is also constant, the net force acting on the car is constant. Since velocity decreases over time and the car stars moving down, the force is pointing down the ramp.
<u>Answer:</u> The amount of heat needed is 29000 Cal.
<u>Explanation:</u>
The process involved in this problem are:
Now, we calculate the amount of heat released or absorbed in all the processes.
- <u>For process 1:</u>
where,
= amount of heat absorbed = ?
m = mass of ice = 200 g
= final temperature =
= initial temperature =
Putting all the values in above equation, we get:
- <u>For process 2:</u>
where,
= amount of heat absorbed = ?
m = mass of water or ice = 200 g
= latent heat of fusion = 80 Cal/g
Putting all the values in above equation, we get:
- <u>For process 3:</u>
where,
= amount of heat absorbed = ?
m = mass of water = 200 g
= final temperature =
= initial temperature =
Putting all the values in above equation, we get:
Calculating the total heat absorbed, we get:
Hence, the amount of heat needed is 29000 Cal.