Physics, 23.04.2020 18:22 bravooyessenia
Try to find out about 'Fresnel' lens on an overhead projector, or stage light. What shape is its surface? Make a drawing to show how it can focus light? What could a concave Fresnel be used for?
Answers: 3
Physics, 22.06.2019 08:30
A40.0 l tank of ammonia has a pressure of 12.7 kpa. calculate the. volume of the ammonia if it’s pressure is changed to 8.4 kpa while its temperature remains constant.
Answers: 3
Physics, 22.06.2019 12:00
Asolid round steel rod 6.25 mm in diameter and 375 mm long is rigidly bonded to the end of solid square brass rod 25 mm on a side and 300 mm long. the geometric axes of the bare are along the same line. an axial tensile force of 5.4 kn is applied at the extreme ends of the assembly. for steel e = 200 gpa and for brass e = 90 gpa. determine the total elongation for the assembly.
Answers: 1
Physics, 22.06.2019 22:20
The starship enterprise is caught in a time warp and spock is forced to use the primitive techniques of the 20th century to determine the specific heat capacity of an unknown mineral. the 125-g sample was heated to 96.3°c and placed into a calorimeter containing 85.9 g of water at 20.0°c. the heat capacity of the calorimeter was 14.2 j/k. the final temperature in the calorimeter was 24.5°c. what is the specific heat capacity (in j/g°c) of the mineral? enter to 4 decimal places.
Answers: 1
Try to find out about 'Fresnel' lens on an overhead projector, or stage light. What shape is its sur...
Mathematics, 03.04.2020 20:00
Mathematics, 03.04.2020 20:00
Computers and Technology, 03.04.2020 20:00
Mathematics, 03.04.2020 20:01
Computers and Technology, 03.04.2020 20:01