Mechanics | Relativity Answers

Give scientific reasons:(1)Viscosity decreases by increasing temperature.(2)The boiling point of liquid remain constant although heat is continuously supplied to the liquid.(3) Pressure cooker is used for rapid cooking.

It is observed that all bodies sliding down a frictionless inclined plane have the same acceleration.How does it happen?Explain.

A truck of mass 2000 kg moving on a highway experiences an average frictional force of 800 N. If its speed increases from 25 ms−1 to 35 ms−1 over a distance of 500 m, what is the force generated by the truck.

A proton undergoes a head on elastic collision with a particle of unknown mass which
is initially at rest and rebounds with 16/25 of its initial kinetic energy. Calculate the
ratio of the unknown mass with respect to the mass of the proton.

a piece of chalk is dropped by a teacher walking at a speed of 1.5 m/s. from the teacher perspective, the chalk appears to fall

An automobile travelling at 80 km hr−1
has tyres of radius 80 cm. On applying brakes,
the car is brought to a stop in 30 complete turns of the tyres. What is the magnitude of
the angular acceleration of the wheels? How far does the car move while the brakes are
applied?

A simple harmonic motion is represented by tatxw=cos)( Obtain expressions for velocity and acceleration of the oscillator. Also, plot the time variation of displacement, velocity and acceleration of the oscillator.

What should be the radius of a space station spinning with an angular speed of 2 rpm such that an astronaut inside the station experiences artificial gravity with g = 10 ms-2?

A pendulum bob of mass 50 g is suspended on a string from the ceiling of an elevator which is moving downwards with an acceleration 1.5 ms-2. Draw the free body diagram using the non-inertial frame of reference and determine the tension in the string. (Take g = 10 ms-2)

A satellite going around Earth in an elliptic orbit has a speed of 10 km s-1 at the perigee which is at a distance of 227 km from the surface of the earth. Calculate the apogee distance and its speed at that point.