The period of revolution (t) of a planet moving round the sun in a circular orbit depends upon the radius (r) of the orbit, mass of

the sun (M) and gravitational constant (G). Show

dimensionally that t² x R³, hence find the numerical value of t

if r= 6.4 μm, M=2000km, G= 6.67 x 10-11Nm²kg ²,

constant of proportionality = 0.5​

Copper has free electrons per cubic meter. a 71.0-cm length of 12-gauge copper wire that is 2.05 mm in diameter carries 4.85 a of current. (a) how much time does it take for an electron to travel the length of the wire? (b) repeat part (a) for 6-gauge copper wire (diameter 4.12 mm) of the same length that carries the same current. (c) generally speaking, how does changing the diameter of a wire that carries a given amount of current affect the drift velocity of the electrons in the wire?

Which type of wave can travel without a medium

What is the measure of how much matter is in an object and that can be measured using a balance? a. height b. volume c. weight d. mass