A helium-filled weather balloon has a 0.50-m radius at liftoff where air pressure is 1.00 atm and the temperature is 290 K. When airborne, the temperature is 200 K, and its radius expands to 2.00 m. What is the pressure at the airborne location?
a. 0.0227 atm
b. 0.172 atm
c. 0.0108 atm
d. 44.1 atm
c
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The visible star nearest the Sun,__________, has a parallax of only 0.76 arc seconds
A) Procyon B) Epsilon Indi C) Sirius D) Alpha Centauri
The coefficient of linear expansion of steel is 12 × 10-6 K-1. What is the change in length of a 25-m steel bridge span when it undergoes a temperature change of 40 K?
A) 1.2 cm B) 1.4 cm C) 1.6 cm D) 1.8 cm E) 2.0 cm
Which of the following is not a capacitance?
A.
B.
C.
D.
E.
A ball is thrown straight up. It reaches its highest point and then falls back. Which of the following is the correct statement?
A. Throughout its motion, the ball's acceleration is zero B. At the highest point in its motion, the ball's acceleration is zero C. At the highest point in its motion, the ball's velocity and acceleration are zero D. At the highest point in its motion, the ball's velocity is zero E. Throughout its motion, the ball's velocity is zero