You have a machine which can accelerate pucks on frictionless ice. Starting from rest, the puck travels a distance x in time t when force F is applied. If force 3F is applied, the distance the puck travels in time t is
A. x.
B. (3/2)x.
C. 3x.
D. (9/2)x.
E. 9x.
Answer: C
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A composite beam of aluminum (Ea 5 72 GPa) and steel (Es 5 190 GPa) has a width b 5 25 mm and heights ha 5 42 mm and hs 5 68 mm, respectively. A bending moment is applied about the z axis resulting in a maximum stress in the aluminum of 55 MPa. The maximum stress in the steel is approximately:
(A) 86 MPa
(B) 90 MPa
(C) 94 MPa
(D) 98 MPa
Mt. Everest is more than 8 000 m high. How fast would an object be moving if it could free fall to sea level after being released from an 8 000-m elevation? (Ignore air resistance.)
a. 396 m/s b. 120 m/s c. 1 200 m/s d. 12 000 m/s
Three identical resistors are connected in series to a battery. If the current of 12 A flows from the battery, how much current flows through any one of the resistors?
A) 12 A B) 4 A C) 36 A D) 24 A E) zero
Which of the following statements about Mars is not true?
A) We have landed spacecraft on its surface. B) It is considered part of our inner solar system. C) We could survive on Mars without spacesuits, as long as we brought oxygen in scuba tanks. D) It has some liquid water today, but used to have large amounts of flowing water.