A 5.0-kg object is suspended by a string from the ceiling of an elevator that is accelerating downward at a rate of 2.6 m/s2 . What is the tension in the string?
a. 49 N
b. 36 N
c. 62 N
d. 13 N
e. 52 N
B
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Estimate the observed wavelength for the 656 nm line in the spectrum of a star which is 100 million light-years from us
A) 653 nm B) 659 nm C) 661 nm D) 677 nm E) 692 nm
Identify the TRUE statement.
The composition of the Jovian planets is mainly gas and "ice." The terrestrial planets consist mainly of "ice." The Sun accounts for almost 50% of the Solar System's mass. The only two planets with moons are Earth and Jupiter. Our Sun is the only star we know of that has planets associated with it.
In a series RLC ac circuit, a second resistor is connected in parallel with the resistor previously in the circuit. As a result of this change, what happens to the impedance of the circuit?
A) It does not change. B) It decreases. C) It decreases for frequencies below resonance and increases for frequencies above resonance. D) It increases. E) It increases for frequencies below resonance and decreases for frequencies above resonance.
Two forces are the only forces acting on a 3.0-kg object which moves with an acceleration of 3.0 m/s2 in the positive y direction. If one of the forces acts in the positive x direction and has a magnitude of 8.0 N, what is the magnitude of the other force?
a. 12 N b. 14 N c. 16 N d. 18 N e. 22 N