A very light cart holding a 300-N box is moved at constant velocity across a 15-m level surface. What is the total work done in the process?
a. 4500 J
c. 20 J
b. 1/20 J
d. zero
D
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The two most important processes in heating the interiors of the terrestrial worlds are ________
A) (1 ) volcanism; (2 ) tectonics B) (1 ) heat from convection; (2 ) heat from thermal radiation C) (1 ) heat deposited by the process of formation; (2 ) heat that came from the gravitational potential energy of incoming planetesimals D) (1 ) heat deposited by the process of formation; (2 ) heat released by radioactive decay
The ____________ are places in the orbital plane of a binary star system where a bit of matter can reach stability. The one located directly between the two stars is the point where the Roche lobes meet
a. turnoff points b. horizontal branch c. Lagrangian points d. synchrotron points e. radiation belts
Vector = 4.0 m points eastward and vector = 3.0 m points westward. The resultant vector + is given by
A) 7.0 m east. B) 7.0 m west. C) 1.0 m east. D) 1.0 m west. E) 3.5 m west.
An object is being acted upon by three forces and moves with a constant velocity. One force is 60 N along the x-axis, the second is 75 N along the y-axis. What is the direction of the third force, measured counterclockwise from the x-axis?
A) 128° B) 182° C) 213° D) 225° E) 231°