A3.0 kg puck slides due east on a horizontal frictionless sur-face at a constant speed of 4.5 m/s. then a force of magnitude 6.0 n, directed due north, is applied for 1.5 s. afterward, a. what is the northward component of the puck’s velocity? a. 0.50 m/s d. 4.0 m/s b. 2.0 m/s e. 4.5 m/s b. what is the speed of the puck? a. 4.9 m/s d. 7.5 m/s b. 5.4 m/s e. 11 m/s c. 3.0 m/s c. 6.2 m/s

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.

Which is not an example of how an object gains elastic potential energy by stretching? a. jumping on a pogo stick b. pulling on a rubber band c. jumping on a trampoline

Each neuron shown in this figure innervates a group of muscle fibers. what is the term for a group of muscle fibers innervated by a single neuron?