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- a) What is the rate of energy loss in watts per square meter through a glass window 1.8 mm thick if the outside temperature is -16°F and the inside temperature is +76°F? (b) A storm window having the same thickness of glass is installed parallel to the first window, with an air gap of 5.3 cm between the two windows. What now is the rate of energy loss if conduction is the only important energy-loss mechanism? (The thermal conductivity of window glass is 1.0 W/m·K, and of air is 0.026 W/m·K.)
- Consider a slab of face area A and thickness L. Suppose that L = 34 cm, A = 63 cm2, and the material is copper. If the faces of the slab are maintained at temperatures TH = 199°C and TC = 21°C, and a steady state is reached, find the conduction rate through the slab. The thermal conductivity of copper is 401 W/m·K.
a baseball is thrown to a distance of 890 m at an angle of 30 degree above horizontal. what is the initial speed of the baseball
A thermodynamic process follows this relation: P = kV⁻². If the initial pressure is P₁ and the final pressure is P₂, then what is the work done on the gas? Heat can flow through the container.
Need to figure out the ground reaction forces on a horse standing still, walking
The horse in question would be 500kg and what I need to is to determine the force on the front legs. The horse distribute their weight with 52% on the front legs and 48% on the back legs. Assuming the foot/hoof is circular with a diameter of 150mm. What force occurs on the front feet?
Standing still ? And walking, around 2m/s?
Thanks
Determine the image distance for a 10.00-cm tall object placed 30.5 cm from a convex lens having a focal length of 16.0 cm.
To reach a final destination a pilot is plotting a course that will result in a velocity of 450 mph in a direction N 60 ° W. There is a wind blowing at 50 mph from due south. Find the direction and speed of the plane.
A cigarette labeled 100’s means that each stick is 100mm long. What will be the total length in inches of all the sticks in a pack if they are placed end to end in a column. Assume that one pack contains 20 sticks.
Directions: Answer the following questions. Show your solutions.
1. If static force is144 N, what is the distance between both charges given that charge 1 is 10μC and charge 2 is 4μC?
2. Two charges separated by a distance of r. if the static force is 3.6N, what is the distance between q1=9μC and q2=4μC.
3. How much force is experienced by the 5nC charge due to the other charges, if there are 3 charges; q1=5nC, q2=-9nC, q3=4nC are placed at the vertices of an equiangular triangle with a side measuring 15cm.
An automobile with an initial speed of 3.40 m/s accelerates uniformly at the rate of 6.0 m/s2. Find the final speed after 5s.
A ball traveling in the +x direction hits the wall at 30m/s and rebounds at 25m/s. If the ball is in contact with the wall for 4ms, determine the average acceleration of the ball during this time interval.
