Five boys are pushing on a snowball, and each is pushing with a force of 20.0 N. However, each boy is pushing in a different direction. They are pushing north, northeast, east, southeast, and south. (Each boy is pushing at an angle of 45.0° relative to his neighbor.) What is the magnitude of the total force on the ball?
a. 54.2 N
c. 24.1 N
b. 48.3 N
d. 0 N
B
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Three identical resistors can be connected in any combination. It's not necessary to include all three in any given combination. The number of distinct values of resistance that can be made is
A. three. B. six or more. C. four. D. two or fewer. E. five.
Neptune has a single, broad ring that is extremely thin
Indicate whether the statement is true or false
What can contribute to a planet losing its atmosphere?
A) thermal escape B) large impacts C) solar wind stripping D) all of these
A 0.200-kg aluminum plate, initially at 20°C, slides down a 13.0-m-long surface, inclined at a 25.0° angle to the horizontal. The force of kinetic friction exactly balances the component of gravity down the plane so that the plate, once started, glides down at constant velocity. If 90% of the mechanical energy of the system is absorbed by the aluminum, what is its temperature increase at the
bottom of the incline? (Specific heat for aluminum is 900 J/kg/°C.) a. 0.115 C° b. 0.0538 C° c. 0.269 C° d. 0.78 C° e. 48.5 C°