Mechanics | Relativity Answers

The compass of an aircraft indicates that it is headed due north, and its airspeed indicator shows that it is moving through the air At 120 mi.hr- 1. a) If there is a wind of velocity 50 mi.hr-1from west to East , what is the velocity of the aircraft relative to earth?(b) in what direction should the pilot head in order to travel due north?(c) what will then be his velocity relative to the earth?

A light flexible rope is wrapped several times around a solid cylinder of mass 50 kg and diameter 0.12m, which rotates without friction about fixed horizontal axis. The free the end of the rope is pulled with a constant force of magnitude 9N for a distance of 2m. If the cylinder was initially at rest, find its final angular velocity and the final speed of the rope.

What is the force of friction?

a bullet strikes a plank of thickness 5cm with velocity 1000m/s and emerges out with velocity of 400m/s. Calculate the average retardation of bullet.

Skier is going downhill starting from rest and accelerating at a constant 2.0m/s squared. If it takes her 15 seconds to reach the bottom, what is the length of the slope?

A body thrown 2s falls under gravity.what is the velocity of the body when it reaches ground?

If the specific heat capacity of water initially is
4.2×103
per kg per K and
g=10m/s2
, the difference in temperature of water between the top and bottom of a 210 m high water fall is ------

A gas occupies a certain volume at 27 degree celcius.If it is heated at constant pressure, its volume is exactly doubled at a temperature of ----------------------

A platinum resistance thermometer has resistance of 52.5 ohms and 9.75 ohms at 0 degrees Celsius and 100 degrees Celsius respectively. When the resistance is 8.25 ohms, find the temperature

a bus start from rest with an acceleration of 1m/s^2.a man who is 48 meter behind the bus is moving with a uniform velocity of 10m/s.then the minimum time after which the man will catch the bus?