A toy train is traveling along a circular track

at a constant speed of 1.0 m/s. The acceleration of the train is found to be 4.0 m/s2

.

What is the radius of the track?

How can you tell when an object changes direction on a displacement vs. time graph

Consider an electron and a proton separated by a distance of 4.5 nm. (a) what is the magnitude of the gravitational force between them? 5.1128e-20 incorrect: your answer is incorrect. n (b) what is the magnitude of the electric force between them?

Add these measurements, using significant digit rules: 1.0090 cm + 0.02 cm = cm

If the electric charge on the object is tripled while its mass remains the same, find the direction and magnitude of its acceleration. direction

What will happen to this current if a magnet is brought near the cord?

Steam moves into a cylinder of a steam engine at a constant pressure and does 2.34 J of work on a piston. The diameter of the piston is 3.4 cm and the piston travels 4.6cm. What is the pressure of the steam?

Identify each type of simple machine.

A car's speedometer reads 20 m/s after accelerating, from a standing start, for 25s. What was the magnitude of its acceleration?

What happens to the period of a pendulum and the period of a spring as the amplitude of the oscillation increases? Briefly give an explanation for this relationship.

The element that is most abundant in earth is