False, friction, air resistance and gravity will be acting on it
Answer:
See the explanation.
Explanation:
The speeds of sound depend upon the temperature of the medium. As the temperature increased in the afternoon, the speed of sound increases. Then the time taken by reflected sound will be less than 0.1 sec in the afternoon. And to hear an echo the time gap between an original sound and reflected sound must be at least 0.1 sec. That is why the student could not hear the echo at all in the afternoon.
The continent of Antartica is located at the bottom of the world. the South Pole is at its center. Antarctica is the coldest and windiest place on earth. It is covered with ice up to 3 miles thick. Very few plants and animals can survive here, but penguins, fish, and seals live on the coast and in the seas. No people live on Antarctica permanently, but scientists and tourists visit.
Answer:
See the explanation below.
Explanation:
- Water cycle is also known as hydro-logical cycle. In the water cycle water from streams, lakes and rivers enters into the atmosphere through Evaporation. The heat energy from sun transforms the liquid into gases phase which then moves from the ground to overlying atmosphere.
- In carbon cycle, water exit from the pores of leaves through the process of evapotranspiration.
- In nitrogen cycle, under marine ecosystem nitrogen through precipitation enters into water, but this nitrogen can not be directly utilized by the plankton hence nitrogen fixation takes place and then the synthesis of organic matter by plankton, whereas, in terrestrial ecosystem nitrogen through precipitation enters into soil from the atmosphere.
Answer:
The answer to your question is below
Explanation:
Kinetic energy is the energy that a body or molecule has due to movement or velocity.
Temperature increases the movement of molecules so in a hot cup of coffee, molecules have a high kinetic energy.
In an ice cream, due to temperature, molecules do not move as fast as in a hot cup of coffee so the kinetic energy will be lower in this substance.