The surface area of a sphere (any sphere) is 4 steradians. this means that the celestial sphere covers 41253 square degrees (3602/t) of the sky. the hudf image is a square of side length 2.4 arc-minutes, and 10,000 galaxies are estimated within the image. assuming the cosmological principle, how many billions of galaxies are there in the known universe?

Thomas his older brothers, who own a junk yard, on the weekends to earn extra money. he likes to them push broken-down cars to the back of the junk yard because it makes him feel strong. last saturday, they pushed three cars with different weights, and he noticed he used different amounts of force for each one. the cars were the following weights: white car: 2,700 kg red car: 1,500 kg blue car: 2,100 kg think about how much force is needed to move each car. which correctly lists the cars in order from the most to least amount of force needed to move them? a) white, blue, red b) blue, red, white c) red, white, blue d) white, red, blue

A2.00-m long piano wire with a mass per unit length of 12.0 g/m is under a tension of 8.00 kn. what is the frequency of the fundamental mode of vibration of this wire?

The force it would take to accelerate an 900-kg car at the rate of 6m/s2