A 3.50 kg block is pulled along a moving conveyor belt at a constant speed of 0.500 m/s relative to a stationary observer while the belt moves at a constant speed of 0.200 m/s in the same direction. If the coefficient of kinetic friction is 0.400, the magnitude of the mechanical energy dissipated, in J, caused by the force of friction on the block in 8.00 s is
a. 5.6.
b. 22.0.
c. 32.9.
d. 54.8.
e. 76.8.
c
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The king's chamber of the great pyramid is 10.43 meters long, 5.21 meters wide, and 5.82 meters high. What is the volume of the chamber in cubic feet?
A) 316 cubic feet B) 3,720 cubic feet C) 6,530 cubic feet D) 11,200 cubic feet E) 13,200 cubic feet
A spaceship approaches Earth with a speed 0.50c. A passenger in the spaceship measures his heartbeat as 70 beats per minute. What is his heartbeat rate according to an observer that is at rest relative to Earth?
A) 73 beats per minute B) 61 beats per minute C) 75 beats per minute D) 65 beats per minute E) 69 beats per minute
A negative mechanical property of ceramics is that they are ______________.
Fill in the blank(s) with the appropriate word(s).
What was the last geological period in Earth's history during which the dinosaurs lived?
A) The Cretaceous Period B) The Tertiary Period C) The Triassic Period D) The Carboniferous Period