the resistance, Ro of a platinum varies with temperature theta °C as measured by a constant-volume gas thermometer according to the equation R theta= Ro(1+ 800 a theta - a theta²) The resistance ,Ro of platinum varies with temperature theta°C as measured by a constant volume gas thermometer according to the equation Rtheta=Ro(1+800atheta-atheta²) where a is a constant. Calculate the temperature on the platinum scale corresponding to 400°C on the gas scale?

The free body diagram shows a box being pulled to the left up a 25-degree incline. the magnitude of the normal force is

Aphoton is absorbed by an electron that is in the n = 3 state of a hydrogen atom, causing the hydrogen atom to become ionized. very far away from the nucleus, the released electron has a velocity of 750,000 m/s. what was the wavelength of the absorbed photon?

Aparticle's position is given by x = 3.00 - 9.00t + 3t2, in which x is in meters and t is in seconds. (a) what is its velocity at t = 1 s? (b) is it moving in the positive or negative direction of x just then? (c) what is its speed just then? (d) is the speed increasing or decreasing just then? (try answering the next two questions without further calculation.) (e) is there ever an instant when the velocity is zero? if so, give the time t; if not, answer "0". (f) is there a time after t = 3 s when the particle is moving in the negative direction of x? if so, give the time t; if not, answer "0".