Saturday
December 7, 2013

# Posts by jessi

Total # Posts: 113

Physics
A 120-V motor has mechanical power output of 2.00 hp. It is 82.0% efficient in converting power that it takes in by electrical transmission into mechanical power. (a) Find the current in the motor (b) Find the energy delivered to the motor by electrical transmission in 3.30 h ...

physics
In the design of a control mechanism, the vertical slotted guide is moving with a constant velocity x'= 15in/s during the interval of motion from x= -8in to x= +8in. For the instant when x= 6in calculate teh n- and t-components of acceleration of the pin P, which is confin...

geometry
How are the radii of 2 two concentric circles related to the distance between them? I tried making an equation using their cirmcumferences but I was way off. All I did was subtract the inner circle's circumference from the outer circle's circumference and set it equal ...

physics
wait it would be different. wouldn't you just subtract 15 since it's starting from an angle with 15 less degrees?

physics
would beta be different for part b?

physics
A meteor P is tracked by a radar observatory on the earth at O. When the meteor is directly overhead (theta = 90), the following observations are recorded: r = 80km, r'= -20km/s, and theta'= 0.4rad/s. (a) Determine the speed of hte meteor and the angle, beta, which it&...

physics
thank you so much! this really helped me see where i went wrong

physics
A test car starts out from rest on a horizontal circular track of 80m radius and increases it's speed at a uniform rate to reach 27.78 m/s in 10s. Find the magnitude of the total acceleration of the car 8s after the start. Ok so I know that the total acceleration is the sq...

Physics
I see how this would be correct but the book says the answer is 11.81ft/s and the vertical rise is 2.16 ft

physics
yes i measured s0 from point A so it's 0

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