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Q1. A school yard teeter totter with a total length of 6.0 m and a mass of 36 kg is pivoted at its center. A 19 kg child sits on one end of the teeter totter.
(a) Where must a parent push with a force of 189 N in order to hold teeter totter level?
(b) Where have to the parent push with a force of 350 N to keep teeter totter level?
Q2. A string of 22 identical Christmas tree lights are connected in series to a 125 V source. The string dissipates 52 W.
What is the comparable resistance of the light string?
A circular saw blade rotating at 15 rev/sec is brought to a stop in 125 revolutions. what is the size of the angular acceleration experienced
If a student with relaxed "normal" eye finds a magnifying glass with a focal length of 78 mm, What is the magnification of this magnifying glass
In a 45° - 90° - 45° prism with a ray of light entering and exiting on the long side of the prism after undergoing two total internal reflections. Determine the minimum index of refraction of the prism in order for this to occur
If unpolarized light of intensity l0 passes through an ideal polarizer, what is the intensity of the emering light
What is the change in internal energy of a system that takes in 2.80 ? 106 J of heat, and does 4.50 ? 105 J of work while dissipating 9.00 ? 106 J of heat
A mass-spring system oscillates on a horizontal frictionless surface with an amplitude of 3.41 cm. If the spring constant is 264 N/m, Determine the maximum speed of the mass
To finance her community college education, Joanna takes out a Stafford loan for $4500. How much will she pay
Consider the Hydrogen atom with its electron in the 1s ground state. What is the probability of finding the electron between 1.1 a0 and 2.7 a0 distances from the proton
The attractive electrostatic force between the point charges 7.14×10?6 and has a magnitude of 0.825, find the sign and magnitude of the charge Q
A 0.120 kg block on a horizontal frictionless surface is attached to the spring whose force constant is 572 N/m. The block is pulled from its equilibrium position at x = 0 m to a displacement x = +0.080 m and is released from rest. The block after th..
An LC circuit is built with a 20 mH inductor and an 8.0 microF capacitor. After what time is the capacitor fully charged
define the magnitude of the torque on the dipole.
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