When you're traveling through the vertical
loop of a rollercoaster you actually don't need to be strapped in to make it
safely through. You definitely need it for other parts of the ride, but not for
the loop itself. In fact, when you're at the top of the loop, you don't feel
pulled down, you "feel" pushed up, right into your seat. Why does that
happen?

Ablock of mass m = 2.5 kg is attached to a spring with spring constant k = 740 n/m. it is initially at rest on an inclined plane that is at an angle of theta= 26 with respect to the horizontal, and the coefficient of kinetic friction between the block and the plane is uk = 0.17. in the initial position, where the spring is compressed by a distance of d = 0.16 m, the mass is at its lowest position and the spring is compressed the maximum amount. take the initial gravitational energy of the block as zero. the block's initial mechanical energy is 9.472 j.b. if the spring pushes the block up the incline, what distance l in meters will the block travel before coming to rest? the spring remains attached to both the block and the fixed wall throughout its motion.

The first law of thermodynamics is as follows: ∆u=q-w , which means in a system is equal to added, minus done by the system. the units for these variables are in .

How is an electron dot structure used to represent a covalent bond?