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

Which of the following statements about insulating materials is correct? a. Insulators can be used to increase the amount of current that can flow through a resistor without increasing its temperature. b.

When 1 carbon atom combines with 2 oxygen atoms, the resulting substance is called?

Why is light-year not related to time? (I just need scientific evidence why it isn't related to time)

Energy can be used to do which of the following things? Select one: Make something hotter Make something move Lift something up All of these are correct

A train departs from its station at a constant acceleration of 5m/s2. What is the speed of the train at the end of 20 seconds

A baseball player was hit by a baseball in the left eye and complains of double vision. What should you do? A. Restrict spinal movement B. Assess pupillary response C. Perform a detailed exam D. Apply ice to orbit

An approaching storm is moving at 15 km an hour what do you need to know to determine its velocity

How did astronomers precisely determine the length of an Astronomical Unit in the 1960s?

If a 1.50 kg mass revolves at the end of a string 0.50 m long, and its tangential speed is 6.0 m/s, calculate the centripetal force.

Balanced forces can change an object's direction. A. True B. False