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Mechanical Advantage The pulley system shown in the figure is used to lift a 52- crate. Note that one chain connects the upper pulley to the ceiling and a second chain connects the lower pulley to the crate. Assume the masses of the chains, pulleys, and ropes are negligible.(Figure 1). Determine the force required to lift the crate with constant speed.Determine the tension in the upper chain. Determine the tension in the lower chain.
Suppose we hang a heavy ball with a mass m = 17 kg (so the weight is mg) from a steel wire 2.5 m long that is 2 mm in diameter (radius = 1e-3 m). Calculate the stretch L of the steel wire
An automobile has a vertical antenna 1.30 m long. The automobile travels eastward at 65 km/h on a horizontal road, Calculate the maximum magnitude of the induced emf in the antenna
A bullet with mass 4.88 g is fired horizontally into a 2.106-kg block attached to a horizontal spring. Find the initial speed of the bullet-block system
Three boxes are being accelerated on a horizontal table with a 60-N force applied to box 1 at an angle 35o below the horizontal. What is the acceleration of the three boxes
A dentist uses a small mirror of radius 45 mm to locate a cavity in a patient's tooth. If the mirror is concave and is held 14 mm from the tooth, what is the magnification of the resulting image.
The parallel metal plate of a capacitor is seperated by a distance of 0.5cm and is connected to a 90v battery. Find an electric field between them and the surface charge density.
The mass of the Earth is 5.98 ? 1024 kg, and the mass of the Moon is 7.36 ? 1022 kg. Locate the center of mass of the Earth-Moon system as measured from the center of the Earth
A hand grenade is thrown with a speed of v0 30 m/s, and a 60 degree angle with x-axis, just prior to exploding. It breaks into two pieces of equal mass after the explosion. One piece has a final velocity of 40 m/s along x. Find the velocity of t..
The efficiency of a particular Carnot engine is 0.310, Find the temperature of the low-temperature reservoir
Assuming the Earth's magnetic field averages about 0.50*10^-4 T near the surface of the Earth, estimate the total energy stored in this field
A copper cable needs to carry a current of 200 A with a power loss of only 3.0 W/m. What is the required radius of the copper cable
A 5 cm by 5 cm square loop of wire is rotating at 30 rpm in a uniform magnetic field of strength 3.0T. The direction of the field is perpendicular to the axis of rotation of the loop.
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