5. State the number of significant digits in each measurement and

express the value in scientific notation.

a. 110 m

f. 20.40 m/s

b. 0.2°C

g0.71 ns

c. 0.090 11 kg

h. 0.06 kg

d. 52.5 X 10 - 3

7040 m

600.0 N

וורן

e.

True or false: the cycle of seasons on the earth is caused by the tilt of the earth on its axis toward and away from the sun.

Explain why electric current cannot exist if a current doesn't have a voltage source.

Consider each of the electric- and magnetic-field orientations given next. in each case, what is the direction of propagation of the wave? a)\vec ein the +xdirection,\vec bin the +ydirection. choose+ x direction- x direction+ y direction- y direction+ z direction- z direction b)\vec ein the -y direction,\vec bin the +x choose+ x direction- x direction+ y direction- y direction+ z direction- z direction c)\vec ein the +z direction,\vec bin the -x direction. choose+ x direction- x direction+ y direction- y direction+ z direction- z direction d)\vec ein the +y direction,\vec bin the -z direction. choose+ x direction- x direction+ y direction- y direction+ z direction- z direction