
An air tight box, having a lid of area 80 cm^2, is partially evacuated. Atmospheric pressure is 1.01 * 10^5 Pa. A force of 108 lb is required to pull the lid off the box. The pressure in the box was:

Now assume that the particle "chooses" a different way of traveling. Calculate the total amount of work done by the electrostatic force on the charged particle as it moves from A to D to C.

Find the voltage increase when 12 J of work is done to push a 0.0014 C charge into an electric field.

A majorleague pitcher can throw a ball in excess of 43.0 m/s. If a ball is thrown horizontally at this speed, how much will it drop by the time it reaches a catcher who is 17.0 m away from the point of release?

A simple harmonic oscillator consists of a block of mass 4.30 kg attached to a spring of spring constant 230 N/m. When t = 2.00 s, the position and velocity of the block are x = +0.129 m and v = +3.415 m/s. (a) What is the amplitude of the oscillations? 1 m (b) What was the position of the...

a dentist uses a curved mirror to view the back side of teeth on the upper jaw. suppose she wants an erect image with a manification of 2.0 when the mirror is 1.2 cm from a tooth. Treat this problem as though the object and image lie along a straight line. Use ray tracing to decide whether a...

A potential difference of 96 mV exists between the inner and outer surfaces of a cell membrane. The inner surface is negative relative to the outer surface. How much work is required to eject a positive sodium ion (Na+) from the interior of the cell?

A 1.5mlong massless rod is pivoted at one end and swings around in a circle on a frictionless table. A block with a hole through the center can slide in and out along the rod. Initially, a small piece of wax holds the block 30 cm from the pivot. The block is spun at 30 rpm, then the temperature...

Three point charges are located on the xaxis. The 1st charge, q1 = 10 C, is at x= 1.0m; the second charge, q2 = 20 C, is located at the orgin; and the third, q3 = 30 C, is located at x = 2.0 m. Which charge is subjected to the net force of greatest magnitude? a) q1 b) q2 c) q3 d) q1...

A jogger jogs around a circular track with a diameter of 225 m in 15 minutes. What was the jogger's average speed in m/s?
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Sample Questions
 The Earth’s rate of rotation is constantly decreasing, causing the day to increase in duration. In the year 2000 the Earth takes about 0.548 s longer to complete 365 revolutions than it did in the year 1900.
 (a) What is the average angular acceleration of the Earth?
 (b) If this average acceleration remains constant, in what year will the Earths rotation come to rest?
1. Can you show me step by step how to solve this problem?:
 A spherical balloon is made from a material whose mass is 3.00kg. The thickness of the material is negligible compared to the 1.5m radius of the balloon. The balloon is filled with helium (He) at a temperature of 305degrees K and just floats in the air, neither rising nor falling. The density of the surrounding air is 1.19kg/m^3. Find the absolute pressure of the helium gas
2. I do not understand this Ideal Gas Law and Kinetic Theory question. Can you help me set it up?