In a practical experiment to determine a physical quantity (L) by adding two physical quantities L, and L2 given that L = (5.2 +0.1) cm and L2 = (5.8 30.2) cm.
Find the value of (L) and the relative error in measuring it.
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Which features on mars point to the possibility of liquid water on the planet? impact craters with sharp rims volcanic cones with craters gullies and stream-like channels mountain ranges with faults

Is there a point between a 10 nc charge and a 20 nc charge at which the electric field is zero?

Aparticle's position is given by x = 3.00 - 9.00t + 3t2, in which x is in meters and t is in seconds. (a) what is its velocity at t = 1 s? (b) is it moving in the positive or negative direction of x just then? (c) what is its speed just then? (d) is the speed increasing or decreasing just then? (try answering the next two questions without further calculation.) (e) is there ever an instant when the velocity is zero? if so, give the time t; if not, answer "0". (f) is there a time after t = 3 s when the particle is moving in the negative direction of x? if so, give the time t; if not, answer "0".