72 In the two-dimensional collision in Fig. 9-21, the projectile particle has mass m = m, initial speed v1 = 3vo, and final speed v
= V5vo. The initially stationary target particle has mass m = 2m
and final speed vze=v2. The projectile is scattered at an angle given
by tan 6 = 2.0.(a) Find angle Oz. (b) Find vz in terms of vo- Is the
collision elastic?
be some

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.

Adding more pulleys to a system of pulleys needed to lift an object. a. increases the force b. decreases the force c. increases the amount of work d. decreases the amount of work

When the force acting on an object points at least partially in the direction of the motion the work done is considered to be negative