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Problem 1: A current of 22 ?A was passing through a wire.
Part (a) Express charge Q passing through the wire in terms of the current I and the time interval Delta t.
Part (b) In a time interval of Delta t = 54 s, how much charge has passed through the wire in ?C?
Problem 2: The filament of an incandescent light bulb is made of tungsten which has a thermal coefficient of resistivity of ? = 4.4 x 10-3K-1. The filament is initially at room temperature, To = 293 K. When it is connected across a V = 80 volt power supply the filament quickly heats up to T = 2700 K at which time the current flowing through the filament is I = 0.65 Amps.
Part (a) Write an equation for the initial current, I0, that flows through the filament when it is initially turned on. (e.g., when it is still at room temperature).
Part (b) Find the numerical value of the current in amps when the filament is at room temperature.
A violinist is trying to tune her instrument to 512 Hz, but it is at 491. By what percent does she have to change the tension to tune the violin? Answer A) 1.2% B) 4.1% D) 8.7% E) 12.1% F) 14.5%
Gas is confined in a tank at a pressure of 11.9 atm and a temperature of 23.0°C. If two-thirds of the gas is withdrawn and the temperature is raised to 76.0°C
A particle of mass m moves next to the x axis. Its position varies with time according to x=(3m/s^3)t^3-(4m/s^2)t^2.
The average density of the planet uranus is 1.27 x 10^3 kg/m^3. The ratio of the mass of neptune to that of Uranus is 1.19. The ratio of the radius of Neptune to that of Uranus is 0.969. Find the average density of Neptune.
Two blocks are connected by a lightweight, flexible cord that passes over a frictionless pulley. If m1 is 3.7 kg and m2 is 9.0 kg, and block 2 is initially at rest 140 cm above the floor, how long does it take block 2 to reach the floor.
In order to manufacture these coffee tables, the company would need to incur $525,000 in fixed costs for new equipment. Calculate the break-even point of the coffee tables in units sold. Illustrate what would be the total revenue at the break-even po..
You push with a 20N horizontal force on a 2 kg mass resting on the horizontal surface against a horizontal friction force of 12N. What is the acceleration.
A uniform flat rectangular sheet of mass m and side lengths a and b rotates with angular speed ? around a diagonal, What is the upper bound on the torque
what most height above the ground will the rocket achieve.
How does the decrease in gravitational potential energy of a falling ball compare to its increase in kinetic energy.
A mortar crew is positioned near the top of a steep hill. Enemy forces are charging up the hill and it is necessary for the crew to spring into action.
A 3.2 kg block of wood sits on a table. A 3g bullet, fired horizontally at a speed of 490 m/s, goes completely through the block, emerging at a speed of 250m/s. What is the speed of the block immediately after the bullet exits.
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