If the value of g suddenly becomes twice its value,it will become two time more difficult to pull a heavy object along the floor.Why?

Answer the following questions : If the value of g suddenly becomes twice its value , it will become two times more difficult to pull a heavy object along the floor. why ?

Answer the following questions: Read the following sequence of events and answer the questions based on the same. Ranjit saw that the dog sitting by his side had suddenly become alert. In a short time, Ranjit heard footsteps of a man and the stranger approached Ranjit. Rajit now understood why the dog had suddenly become alert. What is the difference between the audible range of sound for Ranjit and the dog?

If we add 8 kg load to the hanger of sonometer, the fundamental frequency becomes 3 times of its initial value. The initial load in the hanger was

The denominator of a fraction is 4 more than twice the numerator. Denominator becomes 12 times the numerator,if both the numerator and denominator are reduced by 6. Find the fraction.

If the length of a pendulum is made 9 times and mass of the bob is made 4 times then the value of time period becomes

Fill in the blanks with appropriate words and write the completed sentences: If the earth shrinks to half of its radius, its mass remaining the same, the weight of an object on the earth will become........ times.

Answer the following questions: Read the following sequence of events and answer the questions based on the same. Ranjit saw that the dog sitting by his side had suddenly become alert. In a short time, Ranjit heard footsteps of a man and the stranger approached Ranjit. Rajit now understood why the dog had suddenly become alert. Name some other animals that can hear sound of frequency not audible to human beings.

Read the following paragraph and answer the questions given below it: The resistance of a metal falls when cooled below room temperature. Many scientists believed that the value of the resistance would become constant at some very low temperature, allowing the current to flow with little or no resistance. H. K. Onnes successfully liquefied helium in 1908 by cooling it to about 4 K. In 1911, while investigating the electrical property of very pure mercury. Onnes discovered that at a temperature of 4.2 kelvin, its resistance practically vanished. This new state, on account of its extraordinary property, is now called the superconducting state and the phenomenon is called superconductivity. A superconductor, below a certain critical temperature, offers almost zero resistance to a flow of current through it. Onnes also discovered that a superconductor exhibits persistent current: once set up, the current continues to flow for a very long time without an electric potential difference driving it and without significant loss. Superconductivity is used in many diverse areas, such as magnetically levitated trains, transmission of electricity, increasing speed of computers, in MRI (magnetic resonance imaging). At what temperature does the resistance of very pure mercury become almost zero?

Read the following paragraph and answer the questions given below it: The resistance of a metal falls when cooled below room temperature. Many scientists believed that the value of the resistance would become constant at some very low temperature, allowing the current to flow with little or no resistance. H. K. Onnes successfully liquefied helium in 1908 by cooling it to about 4 K. In 1911, while investigating the electrical property of very pure mercury. Onnes discovered that at a temperature of 4.2 kelvin, its resistance practically vanished. This new state, on account of its extraordinary property, is now called the superconducting state and the phenomenon is called superconductivity. A superconductor, below a certain critical temperature, offers almost zero resistance to a flow of current through it. Onnes also discovered that a superconductor exhibits persistent current: once set up, the current continues to flow for a very long time without an electric potential difference driving it and without significant loss. Superconductivity is used in many diverse areas, such as magnetically levitated trains, transmission of electricity, increasing speed of computers, in MRI (magnetic resonance imaging). Name any two applications of super-conductivity.

Read the following paragraph and answer the questions given below it: The resistance of a metal falls when cooled below room temperature. Many scientists believed that the value of the resistance would become constant at some very low temperature, allowing the current to flow with little or no resistance. H. K. Onnes successfully liquefied helium in 1908 by cooling it to about 4 K. In 1911, while investigating the electrical property of very pure mercury. Onnes discovered that at a temperature of 4.2 kelvin, its resistance practically vanished. This new state, on account of its extraordinary property, is now called the superconducting state and the phenomenon is called superconductivity. A superconductor, below a certain critical temperature, offers almost zero resistance to a flow of current through it. Onnes also discovered that a superconductor exhibits persistent current: once set up, the current continues to flow for a very long time without an electric potential difference driving it and without significant loss. Superconductivity is used in many diverse areas, such as magnetically levitated trains, transmission of electricity, increasing speed of computers, in MRI (magnetic resonance imaging). Name the scientist who discovered superconductivity.