• QUESTIONS BEFORE LECTURE 26

now be sure you can answer these

• Say how mass causes the curvature of spacetime, stating it as an extension of the statement last lecture that Dynamics is Kinematics is Mathematics.
• Describe the bending of starlight as it was observed during a solar eclipse.
• Give two examples of gravitational lensing.
• Write Einstein's tensor equation relating curvature to energy density. Carefully define each term.
• Define scalar, vector, and tensor, with an example to illustate each.
• Give the argument that a clock nearing a mass slows down.
• How much does a clock on our airplane flying from Chicago to Los Angeles gain in about three hours?