A race car starts from rest on a circular track of radius 400 m. Its speed increases at the constant rate of 0.500 m/s2 . At the point where the magnitudes of the radial and tangential accelerations are equal, determine (a) the speed of the race car, and (b) the elapsed time
14.1 m/s, 28.3 s
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Which of the following is true of Claudius Ptolemy?
A) He was interested in philosophical rather than practical questions about the Universe. B) For him, first principles took second place to accuracy. C) He believed that Earth was at the exact center of the Universe. D) He disagreed completely with Aristotle's ideas of the Universe.
A proton (+1.6 × 10^?19 C) moves 20 cm on a path in the direction of a uniform electric field of strength 2.4 N/C. How much work is done on the proton by the electrical field?
a. 7.7E–20 J b. ?7.7E–20 J c. 1.8E–19 J d. ?8.6E–20 J e. zero
The relationship between mass and weight is given by the equation
a. m = wg. b. w = m/g. c. g = mw. d. w = mg.
The atomic number of an atom is equal to the number of what particles in the nucleus?
A) protons B) neutrons C) nucleons D) electrons E) positrons.