Does the spring force increase or decrease and by how much

Reference no: EM13309903

Batteries in a flashlight must be held in electrical contact even though the outer plastic housing expands differently than the battery and terminals. This is accomplished by having a compliant spring compressed as the cover is screwed on the flashlight. When the cover is screwed on at room temperature (70^oF), the spring, with constant 5lb/in., compresses by 0.25in. The plastic casing has a thermal expansion coefficient of 85(10'6)(^oF)1. Let the battery and spring have a single thermal expansion coefficient like that of steel, 6.6(10?6)(?F)?1, and neglect the elastic deformation of the battery.

If the temperature of the flashlight increases to 120^oF, does the spring force increase or decrease and by how much? Take the casing wall to have an outer diameter of 1.5 in., thickness 0.125in.,length L = 3 in., and elastic modulus of 300ksi.

Reference no: EM13309903

Questions Cloud

A central issue for its senior managers : The strategic positioning of your chosen organisation is a central issue for its senior managers. As you know from your readings, strategic positioning has two important themes: strategic potential and organisational ambitions (page 46 of your text -..

What will he get for the potential energy : For someone who chooses y=0 to be 5 meteres above the ground and up as positive, what will he get for the potential energy

Determine what will be the residence time of the tank : A water treatment plant treats a continuous flow rate of 50,000 m^3/day and plans to build a 10,000 m^3 tank to house an additional treatment process. What will be the steady-state effluent concentration of an ideal CSTR

What is the velocity at the bottom of the slope : A block of mass M is at point A on the slope (the slope is just a %u201Cregular roller coaster ride %u201D, What is the velocity at the bottom of the slope at point B which is 5 meters below point A

Does the spring force increase or decrease and by how much : If the temperature of the flashlight increases to 120oF, does the spring force increase or decrease and by how much. Take the casing wall to have an outer diameter of 1.5 in., thickness 0.125in.,length L = 3 in., and elastic modulus of 300ksi.

What is the quantum number of the level : When an electron in a hydrogen atom falls from a higher energy state down to the ground state, What is the quantum number of the level from which the electron fell

Explain what molar ratio of acetic acid to sodium acetate : What molar ratio of acetic acid to sodium acetate is required to create a buffer solution having a pH of 4.84 at 25°C

Find where is this persons near point and far point : A person's eyeball has a diameter D (measured from lens to retina). find Where is this person's near point and far point

Financial statements for proposed acquisition of scissor : Paper Incs Board of Directors has requested a set of pro-forma financial statements for the proposed acquisition of Scissor Company.

User Account

All Pages