According to general relativity, mass and energy cause the curvature of spacetime. To have perfectly flat spacetime, there must be a completely empty vacuum state with no mass or energy. Does this mean that perfectly flat spacetime cannot exist if mass and energy are present?
Let's assume that...
I'm just an ordinary person who's very interested in physics. I'm posting a question because I'm curious about quantum mechanics.
The wavelength of the material wave that can be obtained when a baseball with a mass of 150 g is thrown at 40 m/s is 1.1×10^-34m by the h/mv formula. As you can see...
I'm just wondering if the same resistance from the pedals, whether they're on a road bike or stationary bike, and if the speed of the pedal is the same, the energy that a cyclist consumes would be the same.
I think it will be similar to the situation below.
There's a person A in outer space. A...
Usually, I like to take a physical approach to phenomena that occur in everyday life. But I feel difficult to solve problems because I don't have higher education
My question stems from this question (What's the difference between running up a hill and running up an inclined treadmill?), which...