An electron has been accelerated by a potential difference of 100 V. If its position is known to have an uncertainty of 1 nm, what is the percent uncertainty (Dp/p × 10^0) of the electron?
a. 1%
b. 2%
c. 10%
d. >>10%
e. 5%
A
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A person makes ice tea by adding ice to 1.8 kg of hot tea, initially at 80°C
How many kilograms of ice, initially at 0.00°C, are required to bring the mixture to 10°C? The heat of fusion of ice is 334 kJ/kg, and we can assume that tea has essentially the same thermal properties as water, so its specific heat is 4190 J/(kg?K). A) 1.0 kg B) 1.2 kg C) 1.4 kg D) 1.5 kg E) 1.7 kg
An astronaut who weighs 800 N on the surface of the Earth lifts off from planet Zuton in a space ship. The free-fall acceleration on Zuton is 3.0 m/s2 (down). At the moment of liftoff the acceleration of the space ship is 0.50 m/s2 (up). What is the magnitude of the force of the space ship on the astronaut?
a. 41 N b. 0.29 kN c. 0.24 kN d. 0.20 kN e. 0.37 kN
Between the orbits of the planets Mars and Jupiter we find
A) the Oort cloud B) Orion's belt C) the Kuiper belt D) the asteroid belt
The "guest star" observed by the Chinese in 1054 is now known to have been a(n) ________
Fill in the blank(s) with correct word