Answer:
The correct answer should be c)
Explanation:
Sorry if I am incorrect, have a good day y’all
Electroreception is limited to aquatic environments because on here is the resistivity of the medium is low enough for electric currents to be generated as the result of electric fields of biological origin. In air, the resistivity of the environment is so high that electric fields from biological sources do not generate a significant electric current. Electroreceptor are found in a number of species of fish, and in at least one species of mammal, the Duck-Billed platypus.
When an object moves its length contracts in the direction of motion. The faster it moves the shorter it gets in the direction of motion.
The object in this question moves and then stops moving. So it's length first contracts and then expands to its original length when the motion stops.
The speed doesn't have to be anywhere near the speed of light. When the object moves its length contracts no matter how fast or slow it's moving.
<h2>
Its average speed (in km/h) on the second half is 298.76 km/hr</h2>
Explanation:
Length of track = 1600 m
Average speed = 250 km/h = 69.44 m/s
We have
Distance = Speed x Time
1600 = 69.44 x time
Time = 23.04 seconds
Total time = 23.04 seconds
Half of the track = 0.5 x 1600 = 800 m
Speed on first half = 215 km/hr = 59.72 m/s
We have
Distance = Speed x Time
800 = 59.72 x time
Time = 13.40 seconds
Time taken to complete remaining half = 23.04 - 13.40 = 9.64 seconds
Distance = 800 m
We have
Distance = Speed x Time
800 = Speed x 9.64
Speed = 82.99 m/s = 298.76 km/hr
Its average speed (in km/h) on the second half is 298.76 km/hr
Answer:
Astronauts float around in space because there is no gravity in space. Everyone knows that the farther you get from Earth, the less the gravitational force is. Well, astronauts are so far from the Earth that gravity is so small. This is why NASA calls it microgravity.
Explanation: