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.
c
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What is hot dark matter?
A) a type of electron that moves more rapidly than ordinary electrons do. B) hypothetical heavy fundamental particles that interact with baryons only through gravity and the weak force. C) hypothetical low mass particles that travel close to the speed of light but do not emit radiation. D) a type of proton that moves more rapidly than ordinary protons do. E) a type of neutron that moves more rapidly than ordinary neutrons do.
Beings on spherical asteroid ? have observed that a large rock is approaching their asteroid in a collision course. At 7514 km from the center of the asteroid, the rock has a speed of 136.0 m/s and later at 2823 km it has a speed of 392.0 m/s
Use energy conservation to find the mass of asteroid ?. You can neglect any effects due to the parent star of the asteroid. (G = 6.67 × 10-11 N ? m2/kg2) A) 4.582 × 1021 kg B) 9.164 × 1027 kg C) 6.112 × 1028 kg D) 4.582 × 1020 kg
It is generally easier to push an object once it is moving than when you are getting it started. This is because
a. sliding friction is zero. b. sliding friction is less than static friction. c. static friction is less than sliding friction. d. static friction is zero.
A car travels in a flat circle of radius R. At a certain instant the velocity of the car is 24 m/s west, and the total acceleration of the car is 2.5 m/s2 53° north of west. Which of the following is correct?
a. R = 0.29 km, and the car's speed is increasing. b. R = 0.23 km, and the car's speed is decreasing. c. R = 0.23 km, and the car's speed is increasing. d. R = 0.29 km, and the car's speed is decreasing. e. R = 0.29 km, and the car's speed is constant.