YASH CLASSES
WORK ,
ENERGY AND POWER
1.Write the formula for kinetic energy and
drive it ?
2.Write the formula for potential energy and drive it ?
3. Define 1 joule ? define power ?
4.An object of mass 10 kg is
moving with velocity
5 m/s
calculate ?
5.A girl of a weighing 400 N is climbing up to a
rope . If she goes to a height of
8 m in 20 s
calculate the power spent by the girl.
6.What is the full name of SONAR
?
7.which wave called pressure wave ?
8. what is wave ? difference between transverse
and
longitudinal waves ?
9.Calculate the time period
of wave of
frequency
20 Hz .
10.If the echo is
heard 4 s after the
sound ;
calculate the distance between source and
the
reflecting surface of speed sound is 344 m/s .
11. What are canal rays ?What was
the model of
an atom proposed
by Thomson ?
12. Who discover neutron, proton and electron ?
13.State the suggestion BOHR and BURY model
atoms of elements ?