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A light bulb is rated at 60 W when used with a 120 V power line. If multiple 60 W light bulbs are to be connected together in parallel, what is the maximum number that can be in parallel without exceeding the 13 A limit of their circuit breaker? Hint: the total current through the parallel circuit is equal to the sum of the currents through each bulb.
Two different simple harmonic oscillators have the same natural frequency (f=7.10 Hz) when they are on the surface of the Earth. Calculate the new frequency of the pendulum
the uniform beam below is 4.0meters long and has mass 30.0kg. Find the tension in the rope and the force exerted by the building on the beam by the building
A 2540-kg test rocket is launched vertically from the launch pad. Its fuel (of negligible mass) provides a thrust force so that its vertical velocity as a function of time is given by v(t)=At+Bt2, What was the initial thrust due to the fuel
The coldest and hottest temperatures ever recorded in Switzerland are -43.2 F (231 K) and 106.7 F(315K) respectively. What is the speed of sound in air at each temperature
a uniform electric field of magnitude 390 nc pointing in the positive x-direction acts on an electron which is
a proton in the upper atmosphere moves at 8.8times105 ms perpendicular to earths magnetic field which at that point
A dog running in an open field has components of velocity v_x = 3.2 m/s and v_y = -2.1 m/s at time t_1 = 11.6 s. For a time interval from t_1 = 11.6 s to t_2 = 19.7 s, the average acceleration of the dog has magnitude 0.30 m/s^2 and direction 35.0..
A spring constant 400N/m is hung from a hook. A fish is hung from the spring and is pulled down 6.5 cm past its equilibrium position, then released to oscillate in simple harmonic motion. If the mass of the fish is 1760 g, what is the period of it..
Another student bumps the field-producing device so that the electric field is now (23.7 N/C)i + (15.5 N/C)k, What is the new electric flux through the hoop
The third-order fringe of 650 nm light is observed at an angle of 17° when the light falls on two narrow slits. How far apart are the slits
Two horizontal forces, 249 N and 165 N, are exerted in opposite directions on a crate. What is the net horizontal force on the create? Be sure to point to the direction of the net force.
Laboratory in your city accidentally released some radioactive gas
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