3. Two metal spheres are mounted on Insulating stands. Sphere X is initially uncharged and sphere Y is initially positively charged.
A motal road, held by an insulating handle, is placed in contact with X and Y as shown.
Insulating handle

What are the charges on X and Y after the rod is placed in contact with them?
Charge on X Charge on Y
A
positive
positive
B
positive
uncharged
C
uncharged
positive
D
uncharged
uncharged

Amira pulls a 3 pound wagon 4 feet. how much work has she done?

Beryl states that insulation with the smallest possible thermal conductivity is best to keep a house warm in winter, but worst for keeping a house cool in summer. sapphire insists the reverse is true: low thermal conductivity is good in the summer, but bad in the winter. which one, if either is correct? a. beryl, because low thermal conductivity results in low heat transfer. b. beryl, because low thermal conductivity results in high heat transfer. d. sapphire, because low thermal conductivity results in high heat transfer. e. neither, because low heat transfer is desirable both in summer and in winter.

Asmall grinding wheel has a moment of inertia of 4.0×10−5 kg⋅m2 . what net torque must be applied to the wheel for its angular acceleration to be 150 rad/s2 ?