Recent content by rainstom07

Is the magnetic field purely a mathematical abstraction or is there actually something there? In other words, if a proton floating in deep space, is there actually something that shoots out in all directions from the proton that will interact with another charge particle?

Hello. I need help clearing up who's gaining potential energy and who's losing potential energy from an particular object perspective. And, from that object perspective, whether the object doing positive work or negative work. W = \int \vec F \cdot d\vec x \Delta U = -W Question 1...

Forward? :confused: I suppose the wheels would just spin faster and faster, but it's linear velocity would not change. I still don't understand why the force of friction is in the +x direction. Is it because the wheel is in a clockwise motion? If so, then --- in the figure...

In the figure http://i.imgur.com/LjFDg.gif, a wheel rolls horizontally without sliding while accelerating with linear acceleration \vec a_{com}. A static frictional force \vec f_s acts on the while at P, opposing its tendency to slide. This is more of an coursework question. When the...

Homework Statement In the figure http://i.imgur.com/Y5Vc7.gif shows a uniform disk (M = 2.5kg, R = 0.20 m) mounted on a fixed horizontal axle. A block (m = 1.2kg) hangs from a massless cord that is wrapped around the rim of the disk. The cord does not slip and there is no friction. Find the...

In a lab, i used a micro-caliper to measure the diameter of an indicator; I got 3.681 mm \pm 0.005 mm. However, i need the measurement to be in meters and i need to divide the measurement by 2 (as i need the radius, not diameter) for easy calculations. I know how to convert the 3.681 mm to...

My professor asked the cost of running a hair dryer of 1500 W for 15.0 minutes for 5 days a week for 4 weeks. The utility company charged $0.60 per kWh. Instinctively, i thought to combine 1500 W with the 15.0 minutes into my version of "kilowatt per hour". 1500 W * \frac{1 KW}{1000 W} =...

:confused::confused::confused::confused::confused: so there's no physical manifestation of the d in the equation for a non-constant velocity? huh?

So let me get this straight. If you consider the distance as the Δd, then you cannot consider the distance as d for a non-constant velocity (i.e. there is acceleration)? I guess this leads to a very interesting question (and probably the source of my confusion). In the equation v = d/t...

The height (the distance between the ramp and the floor).

Can you explain why a non-constant velocity doesn't work? For instance, if the ball goes down the slanted ramp, i start the timer when it goes airborne and then stopped the timer when it hits the floor; thus, i obtain t seconds. I then measure the distance between the ramp and the floor; thus, i...

I just need some clarification. In a lab that i did, a metal ball goes down a slanted ramp, onto a horizontal ramp of d distance, and then goes airborne (off the table). The instant the ball enters the horizontal ramp a timer is started, and - when it goes airborne - the timer is stopped. Thus...

In the figure, at the point where the orange car is at, what is preventing the car from falling down to the earth? Where does the force \vec{F}_u comes from? From the car's velocity? If so, how could it? Isn't the velocity at the point completely in the x direction? Thus, there is no y...

Thank you! i knew there was some sort of condition attached to the simpler version of average velocity. ^^ yup

I'm doing a homework problem (i already know the answer) and i came across an error in my logic/application of the formula Vavg = (v + v0)/2. Hopefully you can help me understand why it's incorrect to use the formula. x = 12t2-2t3 describes a particle position. the derivative of x = 24t-6t2...