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 major-league 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 1.5-m-long 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 x-axis. 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?