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

Physics & Space Science

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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

Physics & Space Science

Of all the planets known in antiquity, ________ is the hardest to observe visually

Fill in the blank(s) with correct word

Physics & Space Science

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.

Physics & Space Science

In the formula Balmer found that for the visible lines in hydrogen that nf=_______.

A. 1 B. 2 C. 3 D. 4 E. 5

Physics & Space Science