A disk of radius R=7.52 cmR=7.52 cm is centered at the origin and lies in the y-zy-z plane. The disk has a surface charge density σ=5.88×10−6 C/m2.σ=5.88×10−6 C/m2. Evaluate the electric field E(x)E(x) produced by this disk along the x-x- axis at point P=(1.19 cm,0.00 cm).P=(1.19 cm,0.00 cm). The Coulomb force constant k=1/(4π0)=8.99×109 N·m2/C2.

What is the relationship between the wavelength of a wave and it's energy?

You carry a 7.0-kg bag of groceries 1.2 m above the ground at constant speed across a 2.7m room. how much work do you do on the bag in the process? (a) 157j (b) 0.00j (c) 185j (d) 82j

Amerry-go-round of radius r, shown in the figure, is rotating at constant angular speed. the friction in its bearings is so small that it can be ignored. a sandbag of mass m is dropped onto the merry-go-round, at a position designated by r. the sandbag does not slip or roll upon contact with the merry-go-round. how would you rank the following different combinations of m and r on the basis of the angular speed of the merry-go-round after the sandbag "sticks" to the merry-go-round from largest to smallest. a) m = 10kg, r = 0.25r b) m = 20kg, r = 0.25r c) m = 10kg, r = 0.50r d) m = 10kg, r = 1.0r e) m = 15kg, r = 0.75r f) m = 40kg, r = 0.25r