A net force of 125 N is applied to a certain object. As a result, the object accelerates with an acceleration of 24.0 m/s2. The mass of the object is
A) 3000 kg.
B) 2880 kg.
C) 144 kg.
D) 0.200 kg.
E) 5.20 kg.
E
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All the following statements about Mars are true. Which one might have led to a significant loss of atmospheric gas to space?
A) Mars lost any global magnetic field that it may once have had. B) The axis tilt of Mars is thought to change significantly with time. C) Outgassed water molecules are split apart, and the oxygen then reacts chemically with surface rock on Mars. D) Mars probably once had a much higher density of greenhouse gases in its atmosphere than it does today.
At its current rate of consuming hydrogen, the Sun can stably shine for ________
Fill in the blank(s) with correct word
A hobbyist launches a projectile from ground level on a horizontal plain. It reaches a maximum height of 72.3 m and lands 111 m from the launch point. Assume no air. What was the angle of launch if g = 9.80 m/s2?
A) 69.0° B) 67.4° C) 22.6° D) 44.8°
The half-life of 131I is 8.04 days. Three days after it was prepared, its activity was 0.50 ?Ci. How many curies (in ?Ci) were initially prepared?
a. .60 b. .70 c. .65 d. .55 e. .39