Answer:
The Light We See
Visible light includes all the wavelengths of light that the human eye can detect. It allows us to see objects in the world around us. Without visible light, we would only be able to sense most objects by sound, touch, or smell. Like humans, most other organisms also depend on visible light, either directly or indirectly. Many animals—including predators of jellyfish—use visible light to see. Plants and certain other organisms use visible light to make food in the process of photosynthesis. Without this food, most other organisms would not be able to survive.
Q: Do you think that some animals might be able to see light that isn’t visible to humans?
A: Some animals can see light in the infrared or ultraviolet range of wavelengths. For example, mosquitoes can see infrared light, which is emitted by warm objects. By seeing infrared light, mosquitoes can tell where the warmest, blood-rich areas of the body are located.
Incandescence
Most of the visible light on Earth comes from the sun. The sun and other stars produce light because they are so hot. They glow with light due to their extremely high temperatures. This way of producing light is called incandescence. Incandescent light bulbs also produce light in this way. When electric current passes through a wire filament inside an incandescent bulb, the wire gets so hot that it glows
Bio-mass and hydro-electricity both are renewable sources of energy.
Bio-mass is organic matter used as a fuel, especially in a power station for the generation of electricity. It is obtained from dead plants and animal wastes. Therefore, it is naturally refilled. It is the result of natural processes. Wood, gobar gas, etc. are some of the examples of bio-mass.
Hydro-electricity, on the other hand, is acquired from the potential energy stored in water at a height. Energy from it can be produced again and again. It is harnessed from water and obtained from mechanical processes.
Answer:
Not testable.
Explanation:
The temperature of coffee can change, as the coffee gains or loses heat to the surroundings or the room temperature. For example, if you put a hot coffee in a cold room, the coffee will lose heat to the surroundings/room temperature, eventually making it colder.
Answer:
Explanation:
Newton's law states that F=mg, or in other applications F=ma, where:
F= force acting on the system
m= mass of the system and
a= acceleration (or g= gravitational acceleration which is 9.8m/s^2)
In your question we know the following variables:
The mass of the arrow (m= 100g, however we should use kilograms- 0.1kg)
The acceleration of the arrow (a=50m/s^2)
If we substitute these values into our given equation, we can find the force acting on the arrow.
F = m x a
F= (0.1) x (50)
F = 5N
hope this helps :)
Answer:
Explanation:
The computation of acceleration of the particle down the slope is shown below:-
data provided in the question
Particle of mass = 1.3 kg i,e sliding down
Inclined = 30 to the horizontal
based on the above information
Force is given by
............ 1
and sliding force is given by
= 
Hence, the acceleration of the particle down the slope is 4.9 m/sec^2
