An open freight car rolls friction free along a horizontal track in a pouring rain that falls vertically. As water accumulates in the car, the car's speed

A) increases.
B) decreases.
C) doesn't change.
D) need more information


Answer: B

Physics & Space Science

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Speed and velocity are the same thing

Indicate whether the statement is true or false

Physics & Space Science

Number 10 copper wire (radius = 1.5 mm) is commonly used for electrical installations in homes. What is the voltage drop in 20 m of #10 copper wire if it carries a current of 12 A? (The resistivity of copper is 1.7 × 10^?8 ??m.)

a. 0.58 V b. 0.48 V c. 2.7 V d. 2.4 V e. 0.34 V

Physics & Space Science

Through what potential difference must an electron (starting from rest) be accelerated if it is to reach a speed of 3.0 × 10^7 m/s?

a. 5.8 kV b. 2.6 kV c. 7.1 kV d. 8.6 kV e. 5.1 kV

Physics & Space Science

The entanglement experiment described in the textbook demonstrates that

A) any reduction of a particle's position uncertainty is accompanied by an increase in its velocity uncertainty, as predicted by quantum theory. B) a particle's energy is not continuous but is instead quantized in specific, discrete "bundles." C) any attempt to observe which slit a particle goes through, in the electron double-slit experiment, causes the interference pattern to switch to a non-interference pattern. D) two separated particles can exhibit instantaneous non-local connections, as predicted by quantum theory. E) quantum theory's prediction of instantaneous non-local connections between separated particles is incorrect.

Physics & Space Science