HP

an escalator carries you from one level to the next in the airport terminal. the upper level is 4.5 m above the lower level, and the length of the escalator is 7 m. your mass is 60 kg. how much work does the up escalator do on you when you ride it from th...

A puck of mass m = 1.10 kg slides in a circle of radius r = 16.9 cm on a frictionless table while attached to a hanging cylinder of mass M = 2.20 kg by means of a cord that extends through a hole in the table. What speed keeps the cylinder at rest?

Calculate the magnitude of the gravitational force between the Earth and an m = 6.00 kg mass on the surface of the Earth. The distance to the center of the Earth from the surface is 6.37×103 km and the mass of the Earth is 5.98×1024 kg.

A mass and spring are arranged on a horizontal, frictionless table. The spring constant is k = 450 N/m, and the mass is 5.4 kg. The block is pushed against the spring so that the spring is compressed an amount 0.35 m, and then it is released. Find the vel...

What is your average power if you lift a 33.8 kg box at a constant speed to a height of 3.27 m in 6.10 s?

One of corner risers is shown at the right. Find the length of the shortest side of this riser. A right triangle with legs x and x+2. With a hypotenuse of x+4.

An unknown amount of helium (He) gas occupies 10.5 L at 1.47 atm pressure and 321 K. What is the mass of helium gas in the container? Use R = 0.0821 L.atm/(mol.K). ____________ g He. Do NOT enter unit. Report your final answer with 3 SFs.

the answer for the first is 2600 J and the second is -2600 J. i just don't know how to get there!

thanks so much!!!!!

I'm sooo stuck.

x=27

KE = h(nu_i - nu_f) but for maximum transfer of energy nu_f = 0.5*nu_i. So answer will be 100 keV.