Which is is not an effective way to gain fitness

A child on roller skates pushes off against the wall with a force of 40N. How far must the child push themselves away from the wall (starting from rest), so that his final kinetic energy is 275J?

If 0.600 mol of a nonvolatile nonelectrolyte are dissolved in 3.70 mol of water, what is the vapor pressure ph2o of the resulting solution? the vapor pressure of pure water is 23.8 torr at 25? c.

A wave has a wavelength of 3.3 m and a speed of 5.6 m/s. What is the frequency of this wave? 0.59 Hz 1.7 Hz 3.4 Hz 18 Hz

If the value of the electric field in an electromagnetic wave were doubled then

What are some ways in which body fat can be measured

Water is poured into a container that has a leak. The mass 'm' of the water is given as a function of time 't' by, m=5t^0.8 - 3t + 20, with t>=0, mass in grams and t in seconds a. at what time is the water mass greatest, and b.

Determine the mechanical energy of this object: a 1-kg ball sits on a 10-meter high cliff. A. The ball isn't moving, so the mechanical energy is zero B. 10 J C. 98 J D.

A proton that has a mass m and is moving at + 164 m/s undergoes a head-on elastic collision with a stationary carbon nucleus of mass 12m. the velocity of the proton after the collision is answer

what is the mass number in atomic mass units of an atom with 14 protons, 14 electrons, and 16 neutrons

How much work does an elephant do while moving a circus wagon 20 meters with a pulling force of 200n