In the figure, one end of a bar is in contact with a circular rail and the other end is pivoted at P. A steady, uniform, magnetic field B is present. The bar rotates about P. The induced current through the resistor R is:
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Which has the higher resistance, a piece of wire with diameter d or a piece of wire the same length, composed of the same material, but having a diameter
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The Bernoulli effect is responsible for the lift force on an airplane wing. Wings must therefore be designed so as to insure that
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A glass flask has a volume of 500 ml at a temperature of 20°C. The flask contains 492 ml of mercury at an equilibrium temperature of 20°C. The temperature is raised until the mercury reaches the 500 ml reference mark. The coefficients of volume expansion of mercury and glass are 18 × 10-5 K-1 and 2.0 × 10-5 K-1, respectively. The temperature at which this occurs, in °C, is closest to:
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If an astronaut were exactly half way between Earth and the Moon, the net gravitational force exerted on the astronaut by these two objects would be
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A brick initially has its largest-area face in contact with a rough surface, as shown on the left in the figure. A force F is required to pull the brick along the surface at constant speed. The brick is now flipped so that a face of smaller area is in contact, as on the right in the figure. The material of the brick is uniform on all faces. What force is now required to pull the brick along at constant speed as before?
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If a 5.0 kg box is pulled simultaneously by a 10.0 N force and a 5.0 N force, then its acceleration must be 3.0 m/s2.
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