The isotope 14C cannot be used in dating old samples of which of the following?
a. charcoal from a fire
b. a bronze implement from a cave
c. a bone buried in mud
d. All of the above can be dated using 14C.
b
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Physical Pendulum: A simple pendulum that consists of a small ball of mass m and a massless wire of length L swings with a period T. Suppose now that the mass is rearranged so that mass of the ball was reduced but the mass of the wire was increased, with the total mass remaining m and the length being L. What is true about the new period of swing? (There could be more than one correct choice.)
A. The new period is T because the total mass m has not changed. B. The new period is T because the length L has not changed. C. The new period is greater than T. D. The new period is less than T. E. The new period is T because neither L nor m have changed.
A parallel-plate capacitor consists of a set of two parallel plates of area A separated by a distance d. This capacitor is connected to a battery that maintains a constant potential difference across the plates
A slab of a dielectric material is inserted in the region between the plates and completely fills it. What changes would you observe as the dielectric is inserted? (There could be more than one correct choice.) A) Both the charge on the plates of the capacitor and its capacitance would change. B) The potential difference across the plates would increase. C) Only the charge on the plates of the capacitor would change. D) Nothing would change. E) Only the capacitance would change.
When a collision is completely inelastic, then:
a. all the kinetic energy is conserved. c. the participants stick together. b. all the kinetic energy is gone. d. the total momentum is zero.
The circuit below shows three resistors in series. R3 > R2 > R1. The resistors are all made of the same wire with the same diameter but have different lengths. Rank the magnitudes of the electric fields in the resistors from least to greatest
a.
E3 < E2 < E1.
b.
E2 < E1 = E3.
c.
E1 = E2 = E3.
d.
E1 = E3 < E2.
e.
E1 < E2 < E3.