When stress exceeds a rock's elastic limit, the rock
A) permanently loses its original form.
B) can either break or flow.
C) becomes plastic.
D) can lose its original form and either break or flow.
Answer: D
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Work-Energy Theorem: A sled having a certain initial speed on a horizontal surface comes to rest after traveling 10 m. If the coefficient of kinetic friction between the object and the surface is 0.20, what was the initial speed of the object?
A. 9.8 m/s B. 6.3 m/s C. 3.6 m/s D. 7.2 m/s E. 8.9 m/s
A spring scale typically indicates the magnitude of the tension force exerted on its bottom hook. What will the scale read in each of the cases shown in the diagram?
A. 49 N
B. 98 N
C. 196 N
D. Other (specify
Conservation of angular momentum explains why the contracting solar nebula's rotation rate increased as it contracted
Indicate whether the statement is true or false
An 8 000-kg aluminum flagpole 100-m high is heated by the sun from a temperature of 10°C to 20°C. Find the increase in internal energy (in J) of the aluminum. (The coefficient of linear expansion is 24 × 10^-6 (°C)-1, the density is 2.7 × 10^3 kg/m3, and the specific heat of aluminum is 0.215 cal/g×°C.)
a. 7.2 × 10^5 b. 7.2 × 10^7 c. 7.2 × 10^3 d. 7.2 × 10^1 e. 7.2 × 10^2