The boundary between cold and warm air masses is called

What is an example of an average main squence star?

The kind of wave that has compressions and rarefactions is a/an ___ wave

The ball rolling along a straight and level path. The ball is rolling at a constant speed of 2.0 m/s. The mass of the ball is 3.0 kg. What is the kinetic energy of the ball? (KE=0.5*m*v)

Which of the following microscope parts should routinely be adjusted to control the light source and provide optimal illumination of the specimen?

A hot-air balloon is accelerating upward under the influence of two forces, its weight and the buoyant force. for simplicity, consider the weight to be only that of the hot air within the balloon, thus ignoring the balloon fabric and the basket.

Which of the following determine an object's velocity? A. speed and direction B. direction and acceleration C. speed and mass D. speed, direction, and acceleration

The following statements regarding the exhaust gas recirculation (EGR) valve are all correct except: Low restriction exhaust systems will have no effect on EGR system operation. B.

A 10.0 V battery is connected to a 120-ohm resistor. Ignoring the internal resistance of the battery Calculate the power delivered to the resistor.

Hemoglobin (Hb) is the O2-carrying protein in our blood. Unlike myoglobin, it has four sites allowing it to bind up to four O2 molecules.

Why does the moon appear to change shape? A: It rotates and makes it own light B: It moves closer and farther away from the earth in a yearly pattern. C: It reflects sunlight as it revolves around the earth.