We have an initially uncharged hollow metallic sphere with radius of 5.0 cm. I place a small object with a charge of +40 µC at the center of the sphere through a hole in the surface. Find the electric field present at a point 10 cm from the sphere's center. (ke = 8.99 × 10^9 N×m2/C2)
a. 9.0 × 10^6 N/C
c. 2.3 × 10^6 N/C
b. 1.1 × 10^6 N/C
d. 36 × 10^6 N/C
D
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A metal sphere of radius 80. mm is charged to a potential of -0.50 kV. With what velocity must an electron be fired toward the sphere if it is to just barely reach the sphere when started from a position 15. cm from the center of the sphere?
What will be an ideal response?
Nova explosions involve a binary system of a white dwarf and a companion star and can occur in the same system repeatedly.
Answer the following statement true (T) or false (F)
A 14-mm tall postage stamp is 4.0 mm from a converging lens. If the image of the stamp is 4.0 mm tall, how far is it from the lens?
A) 14 mm B) 8.7 mm C) 1.4 mm D) 1.1 mm
Four identical particles (mass of each = 0.24 kg) are placed at the vertices of a rectangle (2.0 m × 3.0 m) and held in those positions by four light rods which form the sides of the rectangle. What is the moment of inertia of this rigid body about an axis that passes through the center of mass of the body and is parallel to the shorter sides of the rectangle?
a. 2.4 kg×m2 b. 2.2 kg×m2 c. 1.9 kg×m2 d. 2.7 kg×m2 e. 8.6 kg×m2