Why is the spectrum of a star called an absorption spectrum?

a force of 20 N acted on a ball thereby imparting an impulse of 70 Ns to the ball. For how long did the force act on the ball?

A 10 kg bowling ball would require what force to accelerate down an alleyway at a rate of 3 m/s2? F= M= A=

A temperature of 20°C is equal to °F.

Julie is making a capacitor with an area of 2.5 * 10-5 m2. The capacitance is 5.5 pF. What is the distance between the plates?

Compounds are only formed and broken apart by blank?

A glass window is a clear object that light passes through as it travels in a straight line. This is a good example of A. refraction of light. B. transmission of light. C. absorption of light. D. reflection of light.

Why is net force a vector sum A. All forces have direction and magnitude B. Forces can only be attractive C. All forces are contact forces D. There are four fundamental forces

Does the elf owl's small size allow it to live in cacti

If grapefruit juice has a ph of 3.0 and egg white have a ph of 8.0, which contains more h + ions? how many more?

Consider a single photon with a wavelength of λ, a frequency of ν, and an energy of e. What is the wavelength,? Consider a single photon with a wavelength of λ, a frequency of ν, and an energy of e.