A short train (engine with four cars) is accelerating at 1.1 m/s2. If the mass of each car is 38,000 kg, and if each car has negligible frictional forces acting on it, what is the force of the engine on the first car? 0.84 × 105 N

3.34 × 105 N

1.67 × 105 N

4.05 × 105 N

Positrons are spontaneously emitted from the nuclei of

You have a resistor and a capacitor of unknown values. first, you charge the capacitor and discharge it through the resistor. by monitoring the capacitor voltage on an oscilloscope, you see that the voltage decays to half its initial value in 2.70 miss . you then use the resistor and capacitor to make a low-pass filter. what is the crossover frequency fc?

The mass of a bowling ball is 10 kg and the mass of a ping pong ball is 0.015 kg. if the two objects are 5 meters apart, what is the gravitational force ?