Thursday
May 23, 2013

# Posts by Brianna

Total # Posts: 479

physics
How much would it cost to watch a football game on the television with a power rating of 300 W for 3.0 h if electrical energy costs \$0.10/kW·h? 0.108 wasent right

physics
How much current is drawn by a television with a resistance of 21 that is connected across a potential difference of 120 V? 5.45A wasnt right

physics
A net charge of 47 mC passes through the cross-sectional area of a wire in 19.0 s. (a) What is the current in the wire? 1 A (b) How many electrons pass the cross-sectional area in 1.0 min? 2 . electrons I got 9.3e+22 for B but its wrong

trig
2sin(4x)[(cos(3/2)x)(cos(5x/2)-sin((15/4)x)]+x can someone simplify this using trig identities?

to bobpursely: i need to simplify the expression using trig identities. and no i meant for there to only be x

2sin(4t)[(cos(3/2)x)(cos(5x/2)-sin((15/4)x)]+x

physics
A 20.0-kg model plane flies horizontally at a constant speed of 12.2 m/s. (a) Calculate its kinetic energy. . J (b) The plane goes into a dive and levels off 20.0 m closer to Earth. How much potential energy does it lose during the dive? Assume no additional drag. J (c) How mu...

physics
An archer puts a 0.26-kg arrow to the bow-string. An average force of 200 N is exerted to draw the string back 1.4 m. (a) Assuming no frictional loss, with what speed does the arrow leave the bow? m/s (b) If the arrow is shot straight up, how high does it rise? m

physics
we dont have textbooks, and my teacher dosent teach, he just gives us really hard homework:(

physics
A 17-kg rock is on the edge of a 103-m cliff. (a) What potential energy does the rock possess relative to the base of the cliff? . J (b) The rock falls from the cliff. What is its kinetic energy just before it strikes the ground? J

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