What is the line, just before something disappears into a black hole, called?

How many neutrons are present in atoms of argon-39?

From laboratory measurements, we know that a particular spectral line formed by hydrogen appears at a wavelength of 486.1 nanometers (nm). The spectrum of a particular star shows the same hydrogen line appearing at a wavelength of 485.9 nm.

Imagine that Earth were in a stable orbit at its current distance from the Sun, but around a different star that had twice the mass of the Sun. Which of the following would have to be true? A. Earth's year would be shorter. B.

A skater goes into a spin with her arms pulled in (close to her body). When she stretches her arms out: A) her angular speed ω decreases due to her moment of inertia decreasing;

Which characteristic is a physical property of wood? A. Wood can burn. B. Wood can rot. C. Wood does not rust. D. Wood is softer than coal.

What change occurs to the mass of an object when an unbalanced force is applied to it? A. The mass increases. B. The mass decreases. C. The mass remains the same. D. The mass reduces to zero. E. The mass changes by an indeterminate amount.

The equilibrium price will rise, but equilibrium quantity may increase, decrease, or stay the same if a. demand increases and supply decreases. b. demand increases and supply increases. c. demand decreases and supply increases. d.

The nearest large galaxy to our own is about 2.5 million light-years away. how many meters is that

An automobile travels on a straight road for 25 km at 32 km/h. it then continues in the same direction for another 25 km at 64 km/h.

Why is it important for engineers to design bumper cars safely