The primary method by which the water in a pot is heated is by ________
a. conduction b. convection c. radiation d. evaporation e. condensation
b
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Based on current understanding, the minimum mass of a black hole that forms during a massive star supernova is roughly
A) 0.5 solar masses. B) 1.4 solar masses. C) 3 solar masses. D) 10 solar masses.
Angie says that an object is in equilibrium if the net torques about the center of mass is zero. Robbie says that an object is in equilibrium if the sum of external forces is zero. Which one, if either, is correct?
A. Both are correct: an object is in equilibrium if either condition holds. B. Neither is correct: both conditions must hold simultaneously. C. Neither is correct: the net external force and the net external torque about any axis must be zero. D. Neither is correct: an object is in equilibrium only if its velocity is zero in all coordinate systems. E. Both are correct: if the sum of the external forces is zero, the net torque about any axis is automatically zero, and vice versa.
Before beach sand becomes rock it must be _______.
What will be an ideal response?
What is the formula of a compound formed from the ions M2+ and X2-?
a. M2X b. MX c. M2X2 d. MX2