Author Question: A car starting from rest accelerates at a constant 2.0 m/s2 for 10 s. It then travels with constant ... (Read 144 times)

Medesa · **on:** Jul 29, 2018

A car starting from rest accelerates at a constant 2.0 m/s2 for 10 s. It then travels with constant speed it has achieved for another 10 s. Then it finally slows to a stop with constant acceleration of magnitude 2.0 m/s2.

How far does it travel after starting?
A) 200 m B) 400 m C) 500 m D) 300 m

Question 2

The first evidence for electromagnetic waves came from

A) Marconi's experiment in which sound waves were sent from a vibrating membrane in one city and received by a similar device in another city.
B) Heinrich Hertz's experiments in which electrons jumped back and forth across a gap in an electric circuit and EM waves were detected at some distance from the gap.
C) Marconi's experiment in which radio waves were sent from a piece of vibrating crystal in one city and received by a similar device in another city.
D) Heinrich Hertz's experiments in which electric charge was placed on small wooden rod and set into rapid vibration; EM waves were detected by a second wooden rod at some distance from the first rod.
E) Maxwell's experiments in which magnetic effects were demonstrated to result from the current in electrical circuits.