A body is oscillating up and down at the end of a spring. Let's consider when the body is at the top of its up and down motion. The displacement vector from the equilibrium position
a. is zero c. points up
b. has its largest magnitude d. points down
B, C
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A parallel-plate capacitor with plate area A and plate separation d has a capacitance of 4 ?F with the gap between the plates unfilled. The gap is then filled with two dielectric materials, one with dielectric constant 2 and the other one with dielectric constant 6 . Each slab of dielectric has area A and thickness d/2, the layering of the dielectrics resulting in the gap being completely
filled. Which of the following combinations of capacitors will have the same capacitance as the newly filled parallel-plate one? a. two capacitors in parallel, one with capacitance of 8 ?F and the other with capacitance of 24 ?F b. two capacitors in series, one with capacitance of 8 ?F and the other with capacitance of 24 ?F c. two capacitors in parallel, one with capacitance of 16 ?F and the other with capacitance of 48 ?F d. two capacitors in series, one with capacitance of 16 ?F and the other with capacitance of 48 ?F e. two capacitors in parallel, one with capacitance of 8 ?F and the other with capacitance of 48 ?F
Who first calibrated the Cepheid variable stars for use in determining distance?
a. Henrietta Leavitt b. Edwin Hubble c. John Glenn d. Carl Sagan e. Harlow Shapley
A single conservative force Fx = (6.0x - 12) N (x is in m) acts on a particle moving along the x axis. The potential energy associated with this force is assigned a value of +20 J at x = 0 . What is the potential energy at x = 3.0 m?
a. +11 J b. +29 J c. +9.0 J d. -9.0 J e. +20 J
This photograph shows x-ray emission from a supernova remnant. What is the source of the x-rays?
A) hot gas expanding outward from the site of a supernova B) cold gas that will soon give birth to new stars C) accretion disk around a black hole near the center of the supernova remnant D) spots within the remnant where hot gas is crashing into and destroying planets