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I. A body of mass 20 kg moves initially with a velocity of 50 km/hr
and then after 2 minute, it changes its velocity to 60 m/s. Find the
force required to change its velocity.
Classify the following into scalars and vectors.
Velocity, distance, pressure, buoyancy, electricity, momentum,
frequency, amplitude, resistance,
A longitudinal wave travels with a frequency of 500 Hz. Find its
time and velocity with which it travels.
A sound wave has 40 troughs and 40 crests passing a point in 4
seconds. Find its wavelength.
5. A longitudinal wave produced by a flute has a frequency of 200 Hz
and has 2 cm wavelength.
After some time the frequency changes producing sound of
wavelength 4cm. Find the value of second frequency.
If a charge of 40 C flows through a conductor in 2.5 S, find the
number of charges passing through the wire.