Fig. 3.1 shows the speed/time graph for a journey travelled by a tractor Q
R
6
spood
m/s
4
2.
P
O
S
200
0
50
100
170
time/s
Fig. 3.1
(a) Use the graph to describe the motion of the tractor during each of the marked sections,
OP
РО
QR
RS
[4)

The bar of prob. 5/82 is repeated here. the ends of the 0.4-m bar remain in contact with their re- spective support surfaces. end b has a velocity of 0.5 m/s and an acceleration of 0.3 m/s2 in the di- rections shown. determine the angular accelera- tion of the bar and the acceleration of end a.

Which compound is held together by the electrostatic force between two ions? a. co2 b. cci4 c. h2s d. mgf2

Amajor difference radio waves, visible light, and gamma rays is the of the photons, which results in different photon frequencies and wavelengths