A Geiger counter is like an electroscope that discharges whenever ions formed by a radioactive particle produce a conducting path. A typical Geiger counter consists of a thin conducting wire of radius 0.002 cm stretched along the axis of a conducting cylinder of radius 2.0 cm. The wire and the cylinder carry equal and opposites charges of 8.0 × 10?10 C all along their length of 10.0 cm. What is the magnitude of the electric field at the surface of the wire?
What will be an ideal response?
7.2 × 106 N/C
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A block, moving on a frictionless horizontal surface on Earth, requires a force if it is to be stopped. Now suppose that the same block, moving with the same speed on a frictionless horizontal surface on the Moon, where gravity is less, is to be stopped in the same time. We can say that, compared to the Earth,
A. the block could not be stopped. B. the force required would be the same. C. less force is required to stop the block on the Moon. D. greater force is required to stop the block on the Moon.
A group of 10 to 100 stars that formed at the same time but are so widely scattered in space their mutual gravity cannot hold them together is called
a. a globular cluster. b. an open cluster. c. an association. d. a spherical component e. an accretion disk.
A rock is thrown straight down with an initial velocity of 14.3 m/s from a cliff. What is the rock's displacement after 2.0 s? (Acceleration due to gravity is 9.80 m/s2.)
a. 81 m b. 48 m c. 38 m d. 22 m e. 31 m
Consider a situation where you carry a 20 N box up a flight of stairs, raising its elevation by 5 m. The work you do is
a. 0 c. 100 J b. 4 J d. none of the above