A 0.30 kg mass is suspended on a string. In equilibrium the mass stretches the spring 2.0 cm downward. The mass is then pulled an additional distance of 1.0 cm down and released from rest
(a) Write down its equation of motion.
(b) Calculate the velocity of the mass at T/3 s.
(a) y = -0.01 cos(22.1 t) meters
(b) 0.19 m/s
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A 500-W device is connected to a 100-V power source. What current flows through this source?
A) 50,000 A B) 200. mA C) 5.00 A D) 20.0 A E) 1.60 × 1018 electrons/s
Of all the planets known in antiquity, ________ is the hardest to observe visually
Fill in the blank(s) with correct word
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.
In the formula
Balmer found that for the visible lines in hydrogen that nf=_______.
A. 1 B. 2 C. 3 D. 4 E. 5