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Q. A light spring with a spring constant of 87.0 N/m rests vertically on the table, as shown in (a) below. A 1.75 g balloon is filled with helium (0°C and 1 atm pressure) to a volume of 4.44 m3 and connected to the spring, causing the spring to stretch, in (b) below. How much does the spring stretch when the system is in equilibrium. (The density of helium is 0.179 kg/m3. The magnitude of the spring force equals kΔx.)
Q. Two identical piano wires have a fundamental frequency of 550 Hz when kept under the same tension. What fractional increase in the tension of one wire will lead to the occurrence of 2 beats/s when both wires oscillate simultaneously?
Cold fusion theory.
What is amplitude of the subsequent oscillations
Heather and Jerry are standing on a bridge 46 above a river. Heather throws the rock straight down with a speed of 20. Jerry, at accurately the same instant of time, throws a rock straight up with the same speed. Overlook air resistance.
Find an expression for the electric potential at the center. A proton is released from rest in a uniform electric field of magnitude 1.20×10^5 N/C. Find the speed of the proton after it has traveled.
Consider the 642 N weights held by two cables shown. The left-hand cable had tension T2 and makes an angle of thelta2 with ceiling. The right-hand cable had tension 460 N and makes an angle of 47 degrees with the ceiling.
What is the cross-sectional area of the wire. Nichrome wire of cross-sectional radius 0.786 mm is to be used in winding a heating coil. If the coil must carry a current of 8.00 A when a voltage of 3.00 x 10^2 V is applied across its ends.
A 1.5 {rm kg} block rests on top of a 7.5 {rm kg} block. The cord and pulley have negligible mass, and there is no significant friction anywhere. What force F should be applied to bottom block so the top block accelerates to the right at 2.60 m/s^..
What is the speed of each ball as it strikes the ground? How far apart are the balls 0.700 s after they are thrown.
A 220 g block on a 50 cm long string swings in a circle on a horizontal, frictionless table at 95.0 rpm. what is the tension on the string.
Find out the angular velocity
Find the gage pressure at the center of pipe A in pounds per square inch and in kilopascals.
How does the solar nebula theory describe the dramatic density difference between the terrestrial and Jovian planets.
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