Question
Why is a force needed to keep a block of cork inside water?
✓
Answer
When a block of cork is immersed in water buoyant force acts on it in an upward direction so to overcome this force we have to apply an equal force in a downward direction to keep a block of cork inside water.
Need a full question paper?
Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.
Explore more
Similar questions
State the principle on which a hydraulic press works. Write one use of the hydraulic press.
Explain the following :
Several soft iron pins can cling, one below the other, from the pole of a magnet.
Several soft iron pins can cling, one below the other, from the pole of a magnet.
A pendulum 100 cm and another pendulum 4 cm long are oscillating at the same time. Calculate the ratio of their time periods.
Give an example of the motion of a body moving with a constant speed but with a variable velocity. Draw a diagram to represent such a motion.
Figure. shows a bar magnet placed on the table top with its north pole pointing towards south. The arrow shows the north-south direction. There are no other magnets or magnetic materials nearby.
What is the magnitude of the magnetic field at each neutral point? Give a reason for your answer.
What is the magnitude of the magnetic field at each neutral point? Give a reason for your answer.
How is a voltameter different from a voltmeter?
A charge of 5000 C flows through an electric circuit in 2 hours and 30 minutes. Calculate the magnitude of current in circuit.
Why is soft iron used as the core of the electromagnet in an electric bell?
Define a fundamental unit.
The word PLATE written on a paper is held in front of a plane mirror. Write down the letters as seen in the following case.
The paper is held parallel to the mirror.
The paper is held parallel to the mirror.