An object in the sky brightens suddenly, but shows no hydrogen lines in its spectrum. it is most likely a (n) :

What is a tool that measures the size of a force

Discuss the dual nature of electromagnetic waves and how they travel in a vacuum and through a medium.

An engineer is investigating ways to improve gas mileage. His initial hypothesis is, "If we use higher octane gasoline, then the gas mileage will increase.

The SI unit for pressure is pascal (Pa). One hectopascal would equal how many pascals? 0.1 Pa 10 Pa 100 Pa 1000 Pa

Television sets. What does it mean to refer to a 20-in TV set or a 25-in TV set? Such units refer to the diagonal of the screen. A 35 -in TV set also has a width of 28 inches. What is its height?

if light travels in a vacuum at 3.00 x 10^8m/s and its frequency is 7.44 x 10^7 what is its wavelength

the half-life of carbon - 14 is 5730 years. What fraction of carbon-14 would remain after 11,460 years?

An object with a mass of 10.9 kg experiences a force of 18.53 N. What is the acceleration of the object? A. 2.2 m/s2 B. 1.7 m/s2 C. 16.83 m/s2 D. 1.3 m/s2

A proton, starting from rest, accelerates through a potential difference of 1.0 kV and then moves into a magnetic field of 0.040 T at a right angle to the field. What is the radius of the proton's resulting orbit

Which of the following terms are needed to completely describe speed? Check all that apply. A. Units B. Direction C. Number D. Mass