A 2.0-kg projectile moves from its initial position to a point that is displaced 20 m horizontally and 15 m above its initial position. How much work is done by the gravitational force on the projectile?
a. +0.29 kJ
b. ?0.29 kJ
c. +30 J
d. ?30 J
e. ?50 J
b
Physics & Space Science
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When a cannonball is fired from a cannon, which undergoes the greater acceleration?
A) the cannonball B) the recoiling cannon C) both the same
Physics & Space Science
The heat of fusion for gold at 1,063
is 66.6 kJ/kg and the specific heat of gold is 0.128 kJ/kg 
What is the energy needed to melt 100 grams of gold starting at 0
A. 20.3 kJ B. 17.8 kJ C. 12.3 kJ D. 9.50 kJ E. 7.50 kJ
Physics & Space Science
A sidereal day is ______________ than a solar day
Fill in the blank(s) with correct word
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