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 did the discovery of radioactivity do to change the geological time scale?

Cora got a $1200 loan for 2 years. She paid $90 in interest. What was her interest rate?

What was the "healing act" that MOST likely inspired "The Blue and the Gray"?

You arrive in my class 50 seconds after leaving math which is 90 meters away. How fast did you travel?

Write the first 10 numbers in the pattern. The first term is 6. The rule is add 5.

the perimeter of a rectangle pool is 74 feet. if the length is one more than twice the width, find the dimensions of the pool

Given the nuclear equation: 19Ne → X + 19F What particle is represented by X? alpha beta neutron positron

MIA PLAYED A VIDEO GAME. SHE STARTED WITH 10 1/2 POINTS. IN THE FIRST ROUND, SHE EARNED 5 1/4 POINTS. SHE LOST 2 1/2 POINTS IN ROUND 2 AND SHE LOST ANOTHER 3 3/

Describe the role self-esteem plays in bullying?

how did jesus his ministry catch the attention of the public and attract his own adherents?