4. Charge may be measured in the
following units except
(a) Coulomb (b) atomic unit of charge (c)
farad (d) Electromagnetic unit of charge
5. Color depends on what characteristic
of light?
(a) its frequency (b) its wavelength (c)
both of these (d) neither of these
6. A concave mirror of radius of curvature
40 cm forms a real image twice as large
as the object. What is the object distance?
(a) 80 cm (b) 60 cm (c) 30 cm (d) 40 cm
7. The driving mirror of a car has a radius
of curvature of 1 m. A vehicle behind the
car is 4 m from the mirror. Find the image
distance behind the mirror.
(a) 7/8 (b) 4/9 (c) 4/7 (d) 9/2

What is the length x of the side of the triangle below? (hint: use the cosine function)

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.

Asmall 21 kilogram canoe is floating downriver at a speed of 1 m/s. what is the canoe's kinetic energy?