Select the correct answer.

Which part of an atom has most of its mass?

OA

electrons

OB

neutrons

OC

nucleus

OD. protons

Why might scientists make a measurement more than one time?

A 50g mass of metal (c=0.20 cal/g°C) at 90°c is dropped into water at 30°c and the temperatures stabilized at 40°c. 100g 50g 2.0g 70g

The atmospheric pressure is due to the (a) sky above our head (b) air mass surrounding the earth (c) gravitational force of sun and other planets. (d) mass of the earth

When the temperature of the air is 25 degrees Celsius the velocity of a sound wave traveling through the air is approximately

In forced convection, the fluid is forced to move by external means such as a fan, pump, or the wind. You must provide an answer before moving to the next part. True / False.

What type of wave is a sound wave A. transverse wave B. longitudinal wave C. light wave D. elctromatic wave

Na+/k+-atpase is considered to be an electrogenic pump because

If the period of a wave is 0.05 s, then what is its frequency?

Which of the following descibes the refraction of a wave?

A 590-kg rocket is at rest on the launch pad. what upward thrust force is needed to accelerate the rocket uniformly to an upward speed of 28 m/s in 3.3 s?