A circular disk is rotating about a central axis with an angular velocity which is increasing at a constant rate. Point 1 on the disk is located at a distance r1 from the center of the disk and point 2 on the disk is located at a distance r2 from the center of the disk. If r2 = 2r1, which of the following ratios is the largest? 1 and 2 refer to being at points 1 and 2 in the subscripts below, all
values occurring at the same time.
a. ?2/?1 b. ?2/?1
c. ac2/ac1 d. All the ratios are 1 so none is larger.
c
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A star has a parallax of 0.04 arc seconds. What is its distance?
A. 25 light-years B. 4 parsecs C. 4 light-years D. 25 parsecs
An 18.0 pm wavelength photon is scattered by a stationary electron through an angle of 120°
What is the wavelength of the scattered photon? (melectron = 9.11 × 10-31 kg, c = 3.00 × 108 m/s, h = 6.626 × 10-34 J ? s) A) 22.9 pm B) 21.6 pm C) 20.4 pm D) 19.2 pm E) 24.1 pm
A parallel plate capacitor of capacitance C0 has plates of area A with separation d between them. When it is connected to a battery of voltage V0, it has charge of magnitude Q0 on its plates. The plates are pulled apart to a separation 2d while the capacitor remains connected to the battery. After the plates are 2d apart, the magnitude of the charge on the plates and the potential difference between them are what?
A.
Q0, 
V0B.
Q0, V0C.
D.
E.
A projectile is fired from ground level with an initial speed of 55.6 m/s at an angle of 41.2° above the horizontal
(a) Determine the time necessary for the projectile to reach its maximum height. (b) Determine the maximum height reached by the projectile. (c) Determine the horizontal and vertical components of the velocity vector at the maximum height. (d) Determine the horizontal and vertical components of the acceleration vector at the maximum height.