A 3.0-kg mass is released from rest at point A of a circular frictionless track of radius 0.40 m as shown in the figure. The mass slides down the track and collides with a 1.4-kg mass that is initially at rest on a horizontal frictionless surface. If the masses stick together, what is their speed after the collision?
a.
2.1 m/s
b.
1.7 m/s
c.
1.9 m/s
d.
1.5 m/s
e.
2.3 m/s
c
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The presence of a Mercurian magnetic field surprised the planetary scientists on the Mariner 10 team because:
A) Mercury is low in iron. B) Mercury spins to rapidly to produce a stable dynamo. C) It's still too hot for its core to have differentiated. D) The dynamo theory predicted that Mercury was spinning too slowly for one. E) Mercury lacks an iron core.
A plane convex lens is made of glass (n = 1.5) with one flat surface and the other having a radius of 20 cm. What is the focal length (in cm) of the lens?
a. 20 b. 30 c. 40 d. 10 e. 50
In addition to revolving around the Sun counterclockwise, most planets also rotate on their axis counterclockwise
Indicate whether the statement is true or false
Electric shielding within a conductor is a consequence of
A) the balancing of opposing forces. B) both the attraction and repelling nature of electricity. C) cancellation of electric field lines. D) all of the above E) none of the above