A device used since the 1940s to measure the kick or recoil of the body due to heart beats is the
“ballistocardiograph.” What physics principle(s) are
involved here to measure the force of cardiac contraction? How might we construct such a device?

What is created when solids, liquids, an gases mix with one another

Charge is distributed along the entire x-axis with uniform density λ. how much work does the electric field of this charge distribution do on an electron that moves along the y-axis from y = a to y = b? (use the following as necessary: a, b, ε0, λ, and q for the charge on an electron.)

Both speed and velocity measure how fast something is moving. however, since speed is not a it does not require a(n question 6 options: a) quantity , unit b) magnitude, unit c) scalar, direction d) vector, direction