A sewing machine needle moves up and down in simple harmonic motion with an amplitude of 1.27 cm and a frequency of 2.55 Hz. (a) What is the maximum speed of the needle? (b) What is the maximum acceleration of the needle?
What will be an ideal response?
(a) 20.3 cm/s (b) 326 cm/s2
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The current in an electron beam in a cathode-ray tube is measured to be 50 µA. How many electrons hit the screen in 7.0 s? (e = 1.6 × 10^?19 C)
a. 4.4 × 10^11 electrons b. 3.5 × 10^13 electrons c. 2.2 × 10^15 electrons d. 3.1 × 10^18 electrons e. 2.7 × 10^17 electrons
In a system with two moving objects, when a collision occurs between the objects:
a. the total kinetic energy is always conserved. b. the total momentum is always conserved. c. the total kinetic energy and total momentum are always conserved. d. neither the kinetic energy nor the momentum is conserved.
A. +x direction B. -x direction C. +y direction D. -y direction E. +z direction F. -z direction T. The field is zero.
Earth's mantle is
a. metallic. b. very dense gas. c. solid. d. liquid.