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B) a glow stick
C) photosynthesis
D) a hydroelectric dam
The question involves the concepts of chemical energy, light energy and energy conversion.
The example which involves the transformation of chemical energy directly into light energy is "B) a glow stick".
A)
In a windmill, the input energy is the wind energy, and that wind energy is then converted to mechanical energy when the rotor blades rotatae. That mechanical energy is then converted to electrical energy. This electrical energy is then used in lamps to get light energy. Hence, the chemcial energy is not directly transformed into light energy in the windmill.
B)
A glow stick uses the chemical energy from the chemicals inside it to produce luminance in the form of light energy. When the stick is bent or broken, it releases the chemicals inside it which undergo a chemical reaction that leads to the conversion of chemical energy into light energy.
C)
During photosynthesis, light energy is used by plants to produce oxygen and energy in the form of sugar (glucose).
D)
A hydroelectric dam receives mechanical energy from water. The gravitational potential energy of water due to its height is converted into kinetic energy when it reaches the turbine. This kinetic energy is then converted to electrical energy.
Hence, the only example where chemical energy is directly converted to light energy is Glow Stick.
Learn more about energy conversion here:
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The attached picture shows different energy conversions.
Answer:
Mac’s Speed = 2.5 m/s
Tosh’s Speed = 4 m/s
Tosh moves 1.5 m/s faster than Mac.
Explanation:
Tosh starts from an initial position of 12m and in a span of 3 seconds, (1.00 seconds to 4.00 seconds) he moves 12 meters.
So his speed is distance / time
s = 12 / 3
s = 4 m/s
Mac starts from an initial position of 2m and in a span of 4 seconds, he traveled 10m (2.00m to 12.00m).
Speed = Distance / time
s = 10 / 4
s = 2.5 m/s
Answer:
D on ed 2020
Explanation:
The speed of an object is the distance divided by the time of travel. The speed of the person running 400 meters in 2 minutes is 3.3 m/s.
Speed is a physical quantity used to measure the distance covered per unit time. Speed is a scalar quantity thus, having magnitude only. The rate of speed is called velocity. Velocity is a vector quantity.
Speed in physics is the ratio of the distance covered per unit time. Thus, speed can have the units m/s, Km/hr, ft/s miles/s etc. As the time of the travel increases, speed is said to be decreasing.
The distance covered = 400 meters.
time = 2 minutes = 2 × 60 s = 120 s
Speed = distance / time
= 400 m/ 120 s
= 3.3 m/s.
Therefore, the speed is 3.3 m/s.
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Answer:
3.3m/s
Explanation:
speed =Distance /Time
x=400m
t=2mintues=2min*60sec/min=120seconds
S=400m/120s
S=3.33333...
therefore speed = 3.3m/s
Answer:
Car B
Explanation:
Inertia of a body is the property to oppose its state of rest or state of uniform motion. It is also equivalent to the measure of its mass. Newton's first law of motion is also called as law of inertia.
According to given question, we have to write the name of car having more inertia. So, the body having more mass will have more inertia.
The mass of car A is 1500 kg while the mass of car b is 2000 kg. Hence, car B will have more inertia.