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.
c
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Which of the following statements is correct?
a. Because for an object in relative motion is always less than 1, a proper time interval ?tp is always shorter than the time interval ?t and a proper length Lp is always longer than the length L. b. Because for an object in relative motion is always greater than 1, a proper time interval ?tp is always longer than the time interval ?t and a proper length Lp is always shorter than the length L. c. Because for an object in relative motion is always less than 1, a proper time interval ?tp is always longer than the time interval ?t and a proper length Lp is always shorter than the length L. d. Because for an object in relative motion is always greater than 1, a proper time interval ?tp is always shorter than the time interval ?t and a proper length Lp is always longer than the length L.
The celestial equator is
a. a line around the sky directly above Earth's equator. b. the dividing line between the north and south celestial hemispheres. c. the path that the sun appears to follow on the celestial sphere as Earth orbits the sun. d. a and b. e. a and c.
A "supermoon" is when the Moon is larger in the sky because it is closer to Earth in its elliptical orbit. This point is called ________________?
a. aphelion b. perihelion c. apogee d. perigee
A stress of 210 MPa is applied to a low-carbon steel with an elastic modulus of 211 GPa. After the stress is applied and then removed, we note that the permanent strain at 0 stress is 0.1. What was the total strain when the stress was equal to 210 MPa?
What will be an ideal response?