Two balls a and b have the same mass and diameter but are made from differenttypes of ribber the ballare dropped from the same height above the floor after collidong with the floor ball a bounches higher than ball bbounches. Which of the following quantities must necessarily be larger for ball a than ball b? a. The momentum just before colliding with the floor.
b. The amount of time in contact with the floor.
c. The kinetic energy just before colliding with the floor.
d. The average force exerted by the floor
e. The impulse exerted by the floor

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.

If an electric circuit is not grounded it is best to reach out and touch it to provide the ground a.true or b.false

On average 8 bananas make up one pound. the price is four pounds for 5.00. you must buy 25 bananas.what is your cost?