Physics Answers

(a)

A certain parallel plate capacitor has plates of area 3.60 m2, separated by 0.0200 mm of nylon, and stores 0.175 C of charge. What is the applied voltage (in V)?

0.175

Incorrect: Your answer is incorrect.

V

(b)

What is unreasonable about this result?

(c)

Which assumptions are responsible or inconsistent?

1.      The velocity of a train changes from 0 to 60 in 20 seconds. Assuming that it is uniformly accelerated, what is the acceleration in m/s squared? 

A hollow metal sphere of outside diameter of 10 cm weighing 5gm/cm3 in air floats half submerged in fresh water. Determine the radius of the cavity

1. A 120cm long uniform rod is balanced at point P with a mass of 125g at one of its ends as shown. Find the mass of the rod

Illustrate the equations that describe the physical quantities of motion:

distance, displacement, velocity and acceleration.

Mary and Sally are in a foot race (see figure (Figure 1)). When Mary is 22 m

m from the finish line, she has a speed of 4.0 m/s

m/s and is 5.0 m

m behind Sally, who has a speed of 5.0 m/s

m/s. Sally thinks she has an easy win and so, during the remaining portion of the race, decelerates at a constant rate of 0.43 m/s

2

m/s2 to the finish line.

Part A

What constant acceleration does Mary now need during the remaining portion of the race, if she wishes to cross the finish line side-by-side with Sally?

You place an object 22 cm in front of a concave lens with a focal length of -35 cm. Find the image distance and magnification that results from this arrangement.

Light is reflected from a glass coffee table. When the angle of incidence is 60.2⁰, the reflected light is completely polarized parallel to the surface of the glass. What is the index of refraction of the glass?

Calculate the ratio of the critical angle of diamond to the critical angle of crown glass if both are surrounded by a vacuum.

A ray of light impinges from air onto a block of ice (n = 1.309) at a 50.0⁰ angle of incidence. Assuming that this angle remains the same, find the radio of the angles of refraction (Ѳ_{2, ice} = Ѳ_{2, water}) when the ice turns to water (n = 1.333).