Which statement is true about black dwarfs?

A. None currently exist in the universe.

B. They are very hot and massive.

C. They burn brightly for only a few weeks or months.

D. They form after supernova explosions ...?

What environmental factors affect kinetic energy and diffusion?

A spring (k = 790 N/m) has a length of 48 cm when zero net force is applied to it. What will its length be when 230 N of force is applied to stretch it? Question 3 options: 3.4 m 0.77 m 3.9 m 0.29 m

If the water in a lake is everywhere at rest, what is the pressure as a function of distance from the surface? The air above the surface of the water is at standard sea-level atmospheric conditions.

Why is wood a renewable resource? A) We use it over and over again. B) It takes millions of years to replace. C) Trees grow everywhere, so we always have some. D) It can be replaced in a reasonable amount of time.

Mom bought me a new skateboard. Which word is the indirect object in this sentence? of text is a memoir?

A bicycle racer sprints near the end of a race to clinch a victory. The racer has an initial velocity of 12.1 m/s and accelerates at the rate of 0.350 m/s2 for 6.07 s. What is his final velocity?

The current in a wire increases from 5 A to 10 A, what happens to its magnetic field? The field is twice as strong the distance of a charged particle from a wire changes from 10 cm to 20 cm, what happens to its magnetic field?

At a constant pressure and a temperature of 280 K, the gas in a cylinder has a volume of 10.0 liters. If the volume of the gas is increased to 20.0 liters, what is the new temperature? 2800 K 28 K 140 K 560 K

what must be the distance between source of sound and mountain to give an echo in 5 seconds?, (speed of sound at 0°c=33m/sec

What is the speed of a 50 g rock if its de Broglie wavelength is 3.32 x 10?