A bimetallic strip is made by bonding together a 1.0-mm thick and 15.0-cm long steel strip to a similar strip made of aluminum
The strip is straight when the temperature is 20.0°C. What will the radius of curvature of the strip be when the temperature is 40.0°C? The coefficient of thermal expansion of steel is 10.5 × 10-6K-1 and that of aluminum is 23.0 × 10-6K-1.
A)
4.0 m
B)
3.6 m
C)
4.8 m
D)
5.2 m
E)
4.4 m
A
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When two or more capacitors are connected in parallel across a potential difference
A) each capacitor carries the same amount of charge. B) the equivalent capacitance of the combination is less than the capacitance of any of the capacitors. C) the potential difference across each capacitor is the same. D) All of the above choices are correct. E) None of the above choices are correct.
A rectangular plate in plane stress is subjected to normal stresses ?x 5 35 MPa, ?y 5 26 MPa, and shear stress ?xy 5 14 MPa. The ratio of the magnitudes of the principal stresses (?1/?2) is approximately:
(A) 0.8
(B) 1.5
(C) 2.1
(D) 2.9
An iron-80 atom %
A 4.0-kg mass, initially at rest on a horizontal frictionless surface, is struck by a 2.0-kg mass moving along the x axis with a speed of 8.0 m/s. After the collision, the 2.0-kg mass has a speed of 4.0 m/s at an angle of 37° from the positive x axis. What is the speed of the 4.0-kg mass after the collision?
a. 2.0 m/s b. 2.7 m/s c. 4.9 m/s d. 2.4 m/s e. 3.6 m/s