This is a true story: a few years ago i had a dead tree removed from the front lawn. and as the operator was grinding down the stump, he severed the natural gas line that led to my house. the operator abandoned the site without informing the gas company for me- i was still at work. natural gas has is denser than air and had flowed into the ground and basement, where any small spark would have ignited the gas. the gas line was open for 4 hours before the gas company turned off the supply.
a) how much natural gas had flowed into the ground and basement on the day the line was cut? the gas line is 0.5" diameter pressurized to 0.5 psig
b) natural gas has an energy content of 39 mj/m^3 compare this to a stick of dynamite that has 2.1 mj how many sticks of dynamite were essentially in my basement? (equivalent)

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.

According to newton's second law, when the same force is applied to two objects of different masses, a the object with greater mass will experience a great acceleration, and the object with less mass will experience an even greater acceleration, b. the object with greater mass will experience a smaller acceleration, and the object with less mass will experience a greater acceleration, c. the object with greater mass will experience a greater acceleration, and the object with less mass will experience a smaller acceleration, d. the object with greater mass will experience a small acceleration, and the object with less mass will experience an even smaller acceleration.

Lin yao looks at the back of a spoon. how should she describe her reflection? upside down and smaller upside down and larger right-side up and smaller right-side up and larger