A freely falling object has a constant acceleration of 9.8 m/s2 . This means that
a. the object's displacement changes by 9.8 m every second squared.
b. the object's speed increases by 9.8 m/s each second.
c. the object's acceleration increases by 9.8 m/s2 each second.
d. the object travels 9.8 m each second.
b
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An object 15 cm high is placed 15 cm in front of a convex mirror with a focal length of ?10 cm. What is the image height (in cm)?
a. 2 b. 4 c. 6 d. 8 e. 30
A U-238 nucleus (mass = 238 units) decays, transforming into an alpha particle (mass = 4.00 units) and a residual thorium nucleus (mass = 234 units). If the uranium nucleus was at rest, and the alpha particle has a speed of 1.50 × 10^7 m/s, determine the recoil speed of the thorium nucleus
___________ is absorbed by ozone in Earth's atmosphere that is located between 20 km and 40 km above Earth's surface. Therefore, telescopes to observe this radiation must be placed in space
a. Infrared radiation b. Ultraviolet radiation c. Radio wave radiation d. X-ray radiation e. Visible light
Your hand is warmed when you blow on it with your mouth open, but when your lips are puckered so that air expands as you blow, your hand is
A) warmer still. B) cooler. C) neither warmer nor cooler.