You are on a train that is traveling at 3.0 m/s along a level straight track. very near and parallel to the track is a wall that slopes upward at a 12° angle with the horizontal. as you face the window ( 0.830 m high, 2.34 m wide) in your compartment, the train is moving to the left, as the drawing indicates. the top edge of the wall first appears at window corner a and eventually disappears at window corner b. how much time passes between appearance and disappearance of the upper edge of the wall?

We want to calculate the total metabolic heat generated by a singing canary taking into account heat transfer by radiation, convection and exhaling air. the air temperature is 20 oc, canary’s body internal and surface temperature is 33oc, external body surface convective heat transfer coefficient is 25.2 w/m2 .k, temperature difference between the inhaled and exhaled air is 4.3 oc, the ventilation rate is 0.74 cc of air per second, specific heat of air is 1.0066 kj/kg.k and density of air is 1.16 kg/m3 . assume the canary’s body to be a cylinder with 7 cm diameter and 9 cm length, and heat exchange is from the side as well as the top and bottom of cylinder. calculate 1) the net rate of heat lost by radiation, assuming heat gained by the bird through radiation from the surroundings is 11.5 w; 2) rate of heat transferred by convection to the surrounding air; 3) rate of heat transferred in the exhaling air without considering any internal evaporation; 4) total metabolic power.

Because light travels in a straight line and casts a shadow, isaac newton hypothesized that light is

Can you match these to the correct definition