What will the temperature of the cosmic microwave background be when the average distances between galaxies are twice as large as they are today?
A. 1.365
B. 4.860
C. 5.250
D. 3.375
Answer: A. 1.365
You might also like to view...
An inventor claims to have designed a perpetual motion machine, a device that creates its own power. Which of the following laws best explains why a perpetual motion machine cannot work?
A) Law of conservation of energy B) Law of conservation of matter C) Newton's second law D) Newton's third law
Does red light have higher or lower frequency than blue light? Does red light have longer or shorter wavelengths than blue light?
What will be an ideal response?
The wheelbase on a 50,000-kg truck is 2.40 m wide and the truck's center of mass is located along the vertical centerline of the truck and 2.00 m above the bottom of the tires. The truck is going around a horizontal turn with a radius of 180 m
What is the maximum speed at which the truck can go around the curve without some of its tires lifting off the road? A) 44.3 m/s B) 38.2 m/s C) 32.5 m/s D) 28.2 m/s E) 25.0 m/s
When you remove electrons from a metal cup, the cup becomes
A) negatively charged. B) positively charged. C) ionized.