Suppose you left five 100-W light bulbs burning in the basement for two weeks. If electricity costs 10
0¢/kW?h, (a) how much did the electricity cost (to the nearest dollar) to leave those bulbs on, and (b) how many joules of electrical energy did they consume?
(a) $17 (b) 6.05 × 108 J
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Process of Science: A prediction based on Newton's theory of gravity led to the discovery of Neptune
Indicate whether the statement is true or false
Equilibrium: A very light wire is used to hang a series of 8.0-kg bricks. This wire will break if the tension in it exceeds 450 N. The bricks are hung one below the other from a hook in the ceiling using this wire, as shown in the figure.(a) How many whole bricks can be hung without breaking the wire?(b) If you add one more brick to the number found in part (a), which string will break?
What will be an ideal response?
Most astronomers now regard Pluto as the largest ________, and NOT a planet
Fill in the blank(s) with correct word
The value of the momentum of a system is the same at a later time as at an earlier time if there are no
a. collisions between particles within the system. b. inelastic collisions between particles within the system. c. changes of momentum of individual particles within the system. d. internal forces acting between particles within the system. e. external forces acting on particles of the system.