Astronomers are comparing two stars that are known to have the

same luminosity. Star A is observed to be 4 times brighter than star B.

How far away is Star A compared to Star B?

2 times closer

4 times closer

2 times farther

16 times closer

What is the temperature change of 1.0 mol of a monotomic gas if its thermal energy is increased by 1.0 J? Express your answer in kelvins.

Jenny runs on the cross-country team for school. She is working on her 10 mile race time. On Day 1, she runs 10 miles over 120 minutes. Find Jenny's average speed on Day 1! Hint: 120 minutes = 2 hours Average speed = miles per hour

A car is moving at 12 m/s and has a mass of 600 kg. What is the kinetic energy of the car

What do you need to know to describe the velocity of an object?

How does bacteria effect cells

A water heater is operated by solar power. If the solar collector has an area of 6.39 m2, and the intensity delivered by sunlight is 550 W/m2, how long does it take to increase the temperature of 1.00 m3 of water from 19.4∘C to 72.1 ∘C?

Which of the following factors will negatively impact the rate of diffusion of a molecule? A short distance between two concentrations of the molecule A low difference in the concentration of the molecule across the media A warm environment

A sound wave has a frequency of 1,395 Hertz. All sound waves in air travel at 343 m/s. Find the wavelength of the sound wave. what's the answer?

Which factor will affect the light-gathering power of a telescope? A. change in the focal length B. change in the diameter of the objective C. change in the angle of the objective D. change in the elevation of the telescope E.

What is the acceleration of a 30.0-kg go kart if the thrust of its engine is 300.0 N?