Oxygen makes up the largest part of living cells at 65%. What is the percentage of the second-most

abundant element in living cells?

Harry is reading an online summary of the law of reflection. The site states that after light hits a mirror, the angle of reflection is the angle between the reflected ray and the normal, which is the surface of the mirror.

Suppose an X-ray binary is found in which the visible star is a 12 M⦿ red giant, the orbital period is 3.65 days, and the semimajor axis is 0.12 AU. Show whether the companion likely to be a neutron star or a black hole.

A stone has a mass of 100 grams and a volume of 10 mL. Water has a density of 1 g/mL. Will the stone float or sink? Explain.

Cell phones do not work everywhere. There are places where your cell phone cannot get a signal

Suppose you see two stars: a blue star and a red star. Which of the following can you conclude about the two stars? A) The blue star has a hotter surface temperature than the red star. B) The blue star is more massive than the red star.

How are magnetic stripes near mid-ocean ridges evidence for sea-floor spreading?

If a truck has a mass of 2 x 106 grams and a velocity of 35m/s, what is its momentum? kgm/s a. 2 million b. 70 c. 57.14 d. 70,000 e. 57,100

A scientist heats a piece of iron until it is glowing white-hot. he places the metal inside a metal box. he removes all of the air from the inside of the box.

Johanna is studying what happens to the energy as a ball rolls down a ramp. What is she studying? Check all that apply. 1. gravitational potential energy 2. electrical energy 3. kinetic energy 4. mechanical energy 5. elastic potential energy

The density of sugar is 1.59 g/cm3. the mass of a sample is 4.0 g. find the volume of the sample