jiangtinanyp2wyu0 jiangtinanyp2wyu0

22-03-2020
Mathematics

contestada

A sphere has a radius of r. What is the area of a cross section taken at a distance of 1/2r from the center of the sphere?

A. 1/4r^2
B. 1/2r^2
C. 1/2pie(r)^2
D. 3/4pie(r)^2

Respuesta :

MathPhys MathPhys

22-03-2020

Answer:

D. ¾ πr²

Step-by-step explanation:

If r is the radius of the sphere, and R is the radius of circular cross section, then:

r² = (½ r)² + R²

r² = ¼ r² + R²

¾ r² = R²

So the area of the circular cross section is:

A = πR²

A = ¾ πr²

Ver imagen MathPhys

Answer Link

Otras preguntas

What is the Greek name for each of the spheres?

Identify one of the adjectives in this sentence: He looked pale and weak. He looked pale and weak

which element in story can the reader use to understand the storys theme?

cual es el numero que aumentado en 16 da 46

Pleaaassseeeee heeeellllpppp

Determine the molar solubility for Cr(OH)3 Ksp = 6.3x10^-31 ....a) Set up the ICE table Cr(OH)3 (s) <-> Cr^3+ (aq) + 3OH^- (aq) b) Ksp expression c) Deter

You paid $375 in simple interest on an 8 year loan at 1.5% interest. How much did you borrow?

Let p and q represent the following simple statements:

there are two numbers tat multiply to -36 and combine to 0. Find the two numbers,then the SMALLER number is your answer for this question

Why was Darwin's theory controversial in the 1800s?