The locking mechanism for the seatbelt of a car makes use of the fact that the apparent vertical direction (i.e. the direction in which a plumb bob hangs) changes with the car's deceleration
In a certain collision, the deceleration of a car is 5.00 g. What angle does the apparent vertical make with the true vertical?
78.7°
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The potential energy of a pendulum is least
a. when its potential energy is greatest. b. at the top of its swing. c. at the bottom of its swing. d. when its total energy is greatest.
A 2.0-kg mass is projected from the edge of the top of a 20-m tall building with a velocity of 24 m/s at some unknown angle above the horizontal. Disregard air resistance and assume the ground is level. What is the kinetic energy of the mass just before it strikes the ground?
a. 0.18 kJ b. 0.97 kJ c. 0.89 kJ d. 0.26 kJ e. 0.40 kJ
The graphs below show the phasors ?Vmax and Imax for five RLC series circuits. The solid arrows represent the voltage phasors, ?V, and the dashed arrows represent the current phasors, Imax. Which graph represents a circuit where the inductive reactance is greater than the capacitive reactance?
a.
b.
c.
Which of these was NOT true about the limitations of Bohr's model?
a. The Bohr model failed to explain why electrons do not radiate. b. The Bohr model could not predict spectral lines for elements which have more than one electron in the outer shell. c. The Bohr model could not account for splitting of spectral lines. d. The Bohr model could not account for the basic periodic nature of the elements. e. The Bohr model could not explain why each shell held the number of electrons that it did.