How did people measure speed before speedometers and radar guns were invented

An air compressor compresses 6 L of air at 120 kPa and 22°C to 1000 kPa and 400°C. Determine the flow work, in kJ/kg, required by the compressor. The gas constant of air is R = 0.287 kPa·m3/kg·K. The flow work required by the compressor is

What is velocity-time graph?

Which element has two or more protons than iron (FE) ? A) Chromium (Cr) B) Osmium (Os) C) Nickel (Ni)

Suppose that the centripetal force acting on an object in circular motion were doubled to a new value, and the object remained in a circular path with the same radius. How would the motion be affected?

All of the following statements about electromagnetic radiation are true except: 1) All electromagnetic radiation travels at the speed of light. 2) All electromagnetic radiation can be considered a form of light.

In pea plants Round (R) is a dominant trait and wrinkled nose (r) is a recessive trait. Which combination would result in wrinkled seeds? 1. RR 2. Rr 3. rr 4. ww

According to the article, data from scientific observations fulfill what three functions

What are the three ways that an object can accelerate

What do you notice about earths axis during the winter solstice

IS IT right to the left a b c d