2009年4月24日 · In summary, the formula for calculating work from force, acceleration, and mass is W = F * a * d. If only given force and acceleration, work can still be calculated by assuming a distance of 1 meter. Work can be negative when the applied force and resulting displacement are in opposite directions.

2011年9月26日 · In summary, the question asks for the amount of work required to lift a 4.0 kg concrete block to a height of 2.0 m. Using the formula W = Fd, where F is the force and d is the distance, and F = mg, where m is the mass and g is the acceleration due to gravity, the work is calculated to be 78.4 J.

2012年7月17日 · This increase in the potential energy occurs because of the work done, which means, the increase in the potential energy is equivalent to the work done, this is: [itex]W=\Delta E=E_f-E_i=mgh_f-mgh_i=mg\Delta h[/itex] In this way, you can relate the work done, with the energy difference. As you can see time plays no role in this whole thing.

2008年12月1日 · Find the work done by the spring force if the block moves (a) from the equilibrium position till the spring is stretched by 10.0 cm, (b) from this last position till the sring is compressed by 3.00 cm. Homework Equations Work = Integral from initial position to final position of the Force of the spring? The Attempt at a Solution

2009年7月30日 · The final velocity is 0 and given constants are the electron charge, mass, distance between capacitor ends, and electric field strength. The solution involves using the Work-Energy theorem or conservation of energy to relate the work done by the field to the change in kinetic energy of the electron.

2010年3月2日 · In summary, the question is asking for the minimum work needed to push a 800 kg car 930 m up a 9.0^\circ incline. One way to approach this is by calculating the component of force (gravity) along the incline and multiplying it by the distance.

2007年8月1日 · When the wavelength is changed to 300 nm, the stopping potential is 1.90 V. To find the work function of potassium and compute a value for Planck's constant, use the equation (phi) = hf - eV_o and set it equal to itself for both cases. This allows you to solve for h and then plug it into one of the equations to find phi.

2014年1月27日 · Homework Statement a worker who carries blocks of cement from a flight of stairs to an apparatus that is 8 meters high. Every block weighs 1.50 x 10 to the second power Newtons and the worker carries 2 blocks every minute. How much work will he realize in 10 minutes and in 60 minutes...

2010年2月2日 · Anyway, the work done by you (against gravity) is simply the increase in (gravitational) potential energy of your body, without having to re-derive and consider forces and direction and whatnot (which may not be very intuitive in such a scenario of climbing stairs).

2009年10月16日 · I self-teach physics to myself, but I don't have a complete book (I only have "Volume 2: Gravity, Waves and Thermodynamics" of "Physics" by Paul Tipler). Volume 1 discusses work and energy, but I don't have it. So, it becomes much more difficult to understand little details that would otherwise simply be read in a book.