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A simple pendulum is used to measure g, using the relation T=2piesqrt(l/g), where T is the period, l is the length, and g is the acceleration due to gravity. Twenty measurements of T give a mean of barT=1.82 sec and a standard deviation of .06 sec. Ten measurements of l give a mean of barl=.823 m and a standard deviation of 0.014. What is the standard deviation of the mean, barg, for the calculated value of g?
A thundercloud similar to the one described in Example 24.3 produces a lightning bolt that strikes a radio tower. find the effective resistance of the air during the lightning strike
In extremely cold weather conditions where the inside thermostat is set to 27 C and the outside temperature is -20 C, your 1200 square ft house might lose heat through the walls at a rate of 4000 W.
A string with a length of 3.0 m has two adjacent resonances at frequencies 112 Hz and 140 Hz. What is the wavelength of the first harmonic
A 1442 kg car is traveling south, and a 2028 kg van is traveling west. what is the speed of each vehicle
Two soccer players start from rest, 47 m apart. They run directly toward each other, both players accelerating. How much time passes before the players collide
A sanding disk with rotational inertia I is attached to an electric drill whose motor delivers a torque of magnitude? calculate the angular velocity of the disk
A 5-lbm toy car is at the end of a spring compressed 2 inches. The linear spring has a force constant of k = 3 lbf/in. How much energy is stored in the compressed spring
A 5 kg mass attached to a horizontal spring is pulled from its equilibrium position by 3 m and let go. what is the maximum velocity of the mass
The air inside a bicycle tire pump has 193 joules of work done on it as 77.3 joules of heat is conducted away from it. What is the change in internal energy of the air
Three point charges, Q1, Q2, and Q3, are located in the xy- plane. Q1 is -5.580E-6 C and is located at the origin; Q2 is 4.230E-6 C, Calculate the total electrostatic potential energy
A magnetic dipole consisting of a 10-turn current loop of area of .1m^2, with a current of 1.0A flowing through each turn, What is the magnitude of torque acting on the loop
The spring constant for the tendon is the same for both groups, 32 {rm {N}/{mm}} . What is the difference in maximum stored energy between sprinters and nonathletes.
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