Calculate the refractive index of the substance if the speed of light in the medium is 210,000 km/s.

2.43

1.43

0.7

1.89

What two factors cause change in seasons

The enthalpy of fusion of ice is 330,000 J/kg. If I have a 1 kg sample, how much energy is needed to melt all of it? A. 33,000 J B. 3,300 J C. 330,000 J D. 330 J

What differentiates baseline actives from health enhancing activities? A. The intensity of the activity B. The cost of the activity C. The participant in the activity D. The frequency of the activity

Which does the big bang theory describe? a cool, dark singularity the origin of the universe the contraction of the universe an explosion at the beginning of time

A cart with an initial velocity of 5.0 m/s to the right experiences a constant acceleration of 2.0 m/s2 to the right. What is the cart's displacement during the first 6.0 s of this motion

Suppose you place a ball in the middle of a wagon, and then accelerate the wagon forward. Describe the motion of the ball relative to the ground. - Describe its motion relative to the wagon.

Water is poured into a container that has a leak. The mass 'm' of the water is given as a function of time 't' by, m=5t^0.8 - 3t + 20, with t>=0, mass in grams and t in seconds a. at what time is the water mass greatest, and b.

Determine the mechanical energy of this object: a 1-kg ball sits on a 10-meter high cliff. A. The ball isn't moving, so the mechanical energy is zero B. 10 J C. 98 J D.

A proton that has a mass m and is moving at + 164 m/s undergoes a head-on elastic collision with a stationary carbon nucleus of mass 12m. the velocity of the proton after the collision is answer

what is the mass number in atomic mass units of an atom with 14 protons, 14 electrons, and 16 neutrons