An auto accelerates from 7.0 m/s at 0.71 m/s2. It travels a distance of 1.033 km while accelerating
(a) What is the final speed at the end of that displacement?
(b) How many seconds did it take to accelerate from 7.0 m/s?
(a) 39. m/s
(b) 45. s
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A ping-pong ball covered with a conducting graphite coating has a mass of 2.5 × 10^-3 kg and a charge of 4.0 µC. What electric field directed upward will exactly balance the weight of the ball? (g = 9.8 m/s2)
a. 6.1 × 10^3 N/C c. 5.1 × 10^6 N/C b. 2.0 × 10^-7 N/C d. 1.2 × 10^4 N/C
What was one obstacle Newton encountered in developing his theory of universal gravitation from his observation of heavenly bodies?
a. He had to prove that Earth was nearly spherical. b. He had to figure out why the Moon doesn't fall down. c. He had to spend many years observing the movement of the planets. d. He had to prove that the mass of the Earth acts as if it was concentrated at the planet's center. e. He had to prove the inverse-square law.
Convection in the mantle is caused primarily by
A) heat moving from the crust to the core. B) conduction. C) gravity and temperature differences. D) friction of overlying lithosphere.
A wheel rotates about a fixed axis with a constant angular acceleration of 4.0 rad/s2 . The diameter of the wheel is 40 cm. What is the linear speed of a point on the rim of this wheel at an instant when that point has a total linear acceleration with a magnitude of 1.2 m/s2?
a. 39 cm/s b. 42 cm/s c. 45 cm/s d. 35 cm/s e. 53 cm/s