55.
a)
From the earths frame of reference, the ball will appear to move in the same direction as the
plane at speed of 300 m/s [forward] 20 m/s [backward] = 280 m/s [forward]. As for the beam
of light, according to the second postulate that Einstein expla
Unit 2 Energy and Momentum
Lesson 5 Work and Energy
17. Energy transformations involved in generating electricity using nuclear power:
The process begins with U-235 decaying into a big pool of coolant, which is potential energy the decaying is kinetic ene
Key questions answers
Lesson 1
1-
Horizontally:
v x =40 cos 50+ 10=35.7 mm /s
Vertically:
v y =40 sin 50=30.6 mm /s
Resultant :
v = 35.7 2+ 30.62=47
=tan 1
2-
mm
s
30.6
=40.6 N of W
35.7
The plane must head in the northwest direction to cancel the effect
Unit 3 Gravitational, Electric, and Magnetic Fields
Lesson 9 Universal Gravitation and Gravitational Fields
29. The earth has a mass of 5.98 x 1024 kg and the moon has a mass of 7.35 x 1022 kg. The distance from the
centre of the moon to the centre of the