Which of the following statements are true of the horizontal motion of projectiles? List all that apply. *
.
A projectile does not have a horizontal velocity.
A projectile with a horizontal velocity will have a horizontal component of
acceleration
The horizontal velocity of a projectile changes by 9.8 m/s each second.
A projectile with a horizontal component of motion will have a constant horizontal
velocity
The horizontal velocity of a projectile is 0 m/s at the peak of its trajectory.
The horizontal velocity of a projectile is unaffected by the vertical velocity; these two
components of motion are independent of each other.
The horizontal displacement(range) of a projectile is dependent upon the initial
horizontal velocity
As a projectile rises towards the peak of its trajectory, the horizontal velocity will
decrease; as it falls from the peak of its trajectory, its horizontal velocity will
decrease

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.

Asuppose a suitcase has a mass of (m) 30 kg and a net force (n) of 10 kg*m/s. what is the acceleration rate of the suitcasein m/s? show your work to support your answer.

You throw a small rock straight up from the edge of a highway bridge that crosses a river. the rock passes you on its way down, 7.00 s after it was thrown. what is the speed of the rock just before it reaches the water 28.0 m below the point where the rock left your hand? ignore air resistance.