A 1.83 m-long aluminum "singing" rod is held in the center by one hand and is stroked along the direction
of the rod by the other. The Young's modulus for Al is
7.00 × 1010 N/m7 and the diameter of the rod is 1.27
cm. If the rod is subjected to a force of 10.5 N, what
is the tensile stress on the rod?

According to newton's second law, when the same force is applied to two objects of different masses, a the object with greater mass will experience a great acceleration, and the object with less mass will experience an even greater acceleration, b. the object with greater mass will experience a smaller acceleration, and the object with less mass will experience a greater acceleration, c. the object with greater mass will experience a greater acceleration, and the object with less mass will experience a smaller acceleration, d. the object with greater mass will experience a small acceleration, and the object with less mass will experience an even smaller acceleration.

World class speed skaters can skate a 3,000-m course in about 4 minutes. what is their average speed for this course? a. 12.5 m/sb. 1.33 m/sc. 1.25 m/sd. 13.3 m/s

Atomic nuclei of almost all elements consist of