A 320-g air track cart is traveling at 1.25 m/s and a 270-g cart traveling in the opposite direction at 1.33 m/s. What is the speed of the center of mass of the two carts?
A)
2.80 m/s
B)
0.0693 m/s
C)
0.131 m/s
D)
1.47 m/s
E)
1.29 m/s
B
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A fossil is found in a layer of strata above one layer dated at 2 million years. From this we can deduce the age of the fossil to be
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A 0.120-pF parallel-plate capacitor is charged to a potential difference of 10.0 V and then disconnected from the battery. A cosmic ray burst creates 1.00 × 10^6 electrons and 1.00 × 10^6 positive charges between the plates. If the charges do not recombine, but reach the oppositely charged plates, by how much is the potential difference between the capacitor plates reduced?
a. 1.33 V b. 7.34 V c. 8.67 V d. 1,330 V e. 8,670 V