Listena bicycle and its rider have a combined mass of 80. kilograms and a speed of 6.0 meters per second. what is the magnitude of the average force needed to bring the bicycle and its rider to a stop in 4.0 seconds?
a.1.2 × 102 n
b.3.2 × 102 n
c.4.8 × 102 n
d.1.9 × 103 n

Aboxcar traveling at 12 m/s approaches a string of 5 identical boxcars sitting stationary on the track. the moving boxcar collides and links with the stationary cars and they all move off together along the track. what is the final speed of the cars immediately after the collision? (you may take the mass of each boxcar to be 18,537 kg.)

The plum pudding model of the atom states that ?

Nacidified solution was electrolyzed using copper electrodes. a constant current of 1.18 a caused the anode to lose 0.584 g after 1.52 ✕ 103 s. given that the charge of an electron is 1.6022 ✕ 10−19 c, calculate avogadro's number. assume that copper is oxidized to cu2+ ions.