The acceleration of a ball as it rolls down a ramp is 4 m/s2 . The ball is referred to 2 s after it starts to roll. A racecar goes around a 200 m radius curve at a constant speed of 40 m/s. Its acceleration is 8 m/s2
Indicate whether the statement is true or false
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Our solar system consists of ________
A) the Sun and the planets, and nothing else B) the Sun and all the objects that orbit it C) a few hundred billion stars, bound together by gravity D) the Sun and several nearby stars, as well as the planets and other objects that orbit these stars
Energy and Momentum: A firecracker explodes in midair and breaks up into many fragments. Which of the following statements are true regarding conditions immediately before and immediately after the explosion?I. The total momentum of the fragments is equal to the original momentum of the firecracker.II. The total kinetic energy of the fragments is equal to the original kinetic energy of the firecracker.
A. Statement I only B. Statement II only C. Both Statement I and Statement II D. Neither statement is true.
The Bohr model pictures a hydrogen atom in its ground state as a proton and an electron separated by the distance a0 = 0.529 × 10^-10 m. The electric potential created by the electron at the position of the proton is
a. -13.6 V. b. +13.6 V. c. -27.2 V. d. +27.2 V. e. +5.12 × 10^9 V.
This person developed his own model in which the Sun and Moon orbited Earth and the planets circled the Sun
a. Galileo b. Newton c. Kepler d. Tycho