A 1380-kg block of granite is dragged up an incline at a constant speed of 1.34 m/s by a steam winch (Fig. 11-32). The coefficient of kinetic friction between the block and the incline is0.41. How ...

I find here: video 1 and video 2 that say that for acceleration is only important power not torque.Internal combustion engines have power and torque that vary with RPM. Power and torque are connected ...

We say 1 meter per second to express 1 meter covered in 1 second. Why can't we say 1 watt per second when 1 watt is used in 1 sec?

There are energy storage solution on earth that can take effect of surplus energy from energy production by combusting fossil fuels and storing the energy from an excess of renewable energy solutions ...

This Guardian article describes an "osmotic power plant" being built in Japan that apparently uses osmotic pressure to drive a turbine:Osmosis is the natural process where water moves ...

Many industry professionals claim that high altitude has a worsening effect on compressor performance. As you know, air density decreases as altitude increases and compressor has to work longer to ...

Suppose you have some electric source configuration $(\rho_1({\bf x}, t), {\bf J}_1({\bf x}, t))$ (satisfying the continuity equation) that produces a total (time-averaged and angle-summed) radiated ...

How is a strain wave related to the mechanical wave power?Say you have a strain wave consisting of an axial and flexural wave that travels through an alumin beam.If the axial wave power is $10 \,\...

I have a question regarding strain waves and wave power. I am looking at a system with two piezoelectric active sensors connected to different sides of an aluminium beam, like in this paper: https://...

I used to think the energy potential of lightning was determined by how many electrons combined with electron deficient matter so I asked on reddit https://www.reddit.com/r/Physics/comments/1fw5xod/...

A battery stores energy, not power. It would not make any sense for something to "store power", because power is not a conserved quantity.Therefore, the energy storage capacity of an ...

In Ohm's law, physical conditions like temperature of the conductor, must stay constant. But does that mean we cannot use it for a bulb or a heater(in general)?We are being taught questions based on ...

In our homes we have parallel connection. So $V$ is same. Hence for power we must use $P = V^2/R$ but this means that increasing resistance will cause less power and so less energy per unit time is ...

In the chapter on Radiation by Moving charges by Jackson, it is stated that Larmor's formula $$P = \frac{2}{3} \frac{q^2}{4\pi \epsilon_0}\frac{\dot{v}^2}{c^3}$$can be generalized to a relativistic ...

I am currently reading a text on laser space communications. It refers to a common equation used to relate the optical power received to the power transmitted.$P_R = P_T \cdot \frac{\Omega_R}{\...