A sphere of diameter 7.9 cm is completely submerged in water and seems to weigh 32.0% less in the water than out of it
(a) What is the density of the sphere?
(b) If the sphere had been twice as dense, it would have weighed what % less in water than out?
(a) 3.13 × 103 kg/m3
(b) 16.0% less
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An ion engine provides a small but constant force on a spacecraft as it moves from Earth to Pluto. Compare the acceleration of the spacecraft near the beginning of its journey with its acceleration as it flies past Pluto.
A. The spacecraft's acceleration at Pluto is slower than its acceleration near Earth. B. The spacecraft's acceleration at Pluto is the same as its acceleration near Earth. C. The spacecraft's acceleration at Pluto is faster than its acceleration near Earth. D. The relative acceleration cannot be determined with the information given.
A definite method for losing weight is
A) exercise. B) reduce Calorie intake. C) maintain a low body temperature. D) none of the above
In a single-slit experiment, the width of the slit is slowly decreased. The diffraction pattern
A. remains unchanged. B. spreads out. C. shrinks together. D. fades away.
Measurements show that it takes 0.30 mJ of work to move 5.0-?C of charge from one plate to another of a certain air-filled capacitor while the potential difference between these plates is kept constant
What is the potential difference between the plates of this capacitor? A) 60 V B) 81 V C) 55 V D) 23 V E) 0 V