NEET (NTA)-National Eligibility cum Entrance Test (Medical) Physics: Questions 109 - 113 of 2320

Passage

Three of the fundamental constants of physics are the universal gravitational constant, G = 6.7 x 10 ^-11 m ³ kg ^-1 s ^-2, the speed of light, c = 3.0 x 10 ⁸ m/s, and Planck’s constant,

h = 6.6 x 10 ^-34 kg m ² s ^-1.

Passage

When an airplane flies, its total velocity with respect to the ground is v _total = v _plane + v _wind’ where v _plane denotes the plane’s velocity through motionless air,

And v _wind denotes the wind’s velocity. Crucially, all the quantities in this equation are vectors. The magnitude of a velocity vector is often called the “speed. ”

Consider an airplane whose speed through motionless air is 100 meters per second (m/s). To reach its destination, the plane must fly east.

The “heading” of a plane is in the direction in which the nose of the plane points. So, it is the direction in which the engines propel the plane.