A 0.2-kg aluminum plate, initially at 20°C, slides down a 10-m long surface, inclined at a 30° 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. 0.16°C
c. 0.05°C
b. 0.07°C
d. 0.03°C
C
You might also like to view...
A galaxy's spectrum has a redshift of 30,000 kilometers per second. If the Hubble constant is 75 kilometers per second per megaparsec, how far away from Earth is the galaxy?
A. 1,000 megaparsecs B. 106 megaparsecs C. 400 megaparsecs D. 20 megaparsecs E. 50 megaparsecs
Although mass transfer can occur in binary stars, the small mass change does not impact the evolution of either companion
Indicate whether the statement is true or false
Geosynchronous satellites orbit the Earth at a distance of 42 000 km from the Earth's center. Their angular speed at this height is the same as the rotation rate of the Earth, so they appear stationary at certain locations in the sky. What is the force acting on a 1 500-kg satellite at this height?
a. 85.0 N b. 333 N c. 404 N d. 457 N
Any flow of water occurring between well-defined banks is defined by geologists as
a. a stream. b. a meander. c. a lake. d. none of these.