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Question1
A uniform bar of length 46 m and mass 3 kg is attached to a wall with a hinge that exerts a horizontal force Hx and a vertical force Hy on the bar. The bar is held by a cord that makes a 90 angle with respect to the bar and 44 with respect to the wall. What is the magnitude of the horizontal force Hx on the pivot? The acceleration of gravity is 9.8 m/s2.
Answer in units of N
Question2
A 39.0-kg child swings in a swing supported by two chains, each 2.98m long. The tension in each chain at the lowest point is 440 N.
(a) Find out the child's speed at the lowest point.
(b) Find out the force exerted by the seat on the child at the lowest point.
Question3
A spring with a force constant of 135 N/m is used to push a 0.27-kg block of wood against a wall. Find out the least compression of the spring needed to keep the block from falling, given that the coefficient of static friction between block and wall is 0.39.
A car takes 9 s to go from v = 0 to v = 75 m/s at approximately constant acceleration. If you wish to find the distance travelled using the equation d = 1/2 at2, what value should you use for a.
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A 2.30-kg object attached to a spring moves without friction (b = 0) and is driven by an external force given by the expression F = 3.40sin (2pi*t), where F is in newtons and t is in seconds. The force constant of the spring is 35.0 N/m.
A 90.0 ohms resistor, a 0.110 H inductor, and a 16.0 uF capacitor are connected in series to a 60.0 Hz source. Find the rms voltage across the resistor
Your friend recently purchased a musical instrument that generates sound waves using several strings. Determine the length of the strings of this instrument
One of the wavelengths of light emitted by hydrogen atoms under normal laboratory conditions is at ?0 = 656.3nm in the red portion of the electromagnetic spectrum, How fast are the emitting atoms moving relative to the earth
Two masses are connected by a cord passing over a pulley of radius R and moment of inertia I. Mass A slides on a frictionless surface, Derive a formula for the acceleration of the masses
A steel beam 10m long is installed in a structure at 15?C, What is the beam's change in length when the temperature reaches 50?C
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