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 driver steps on the gas, and his racecar travels 20 meters in 2 seconds starting from rest. The acceleration of the racecar is
a. 0 d. 10 m/s2
b. 5 m/s2 e. 20 m/s2
c. 9.8 m/s2
D
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Current evidence suggests that the universe is
a. flat, infinite, and neither expanding nor contracting. b. closed, finite, and slowing its expansion. c. open, infinite, and slowing in its expansion. d. static with no expansion. e. flat, infinite, and accelerating in its expansion.
What is the escape velocity from the Moon for a lunar landing module sitting on the Moon's surface? Hints: ; The mass of the Moon is 7.2 × 10^22 kg; its radius is 1738 km; G = 6.67 10^-11 m3/s2/kg
a. 2.3 m/s b. 23 m/s c. 2.3 km/s d. 11 km/s e. 23 km/s
If a cup of tea at room temperature, 24°C is heated until it has twice the internal energy, unlike a piece of metal, its temperature will be
A) 48°C. B) 100°C. C) 321°C. D) 594°C. E) none of the above
The energy level diagram for hydrogen
The energy of a photon emitted in a transition from the n = 3 state to the n = 2 state is __________.