Physics

A 1.20 kg copper rod resting on two horizontal rails 0.90 m apart carries acurrent I = 55.0 A from one rail to the other. The coefficient of static frictionbetween the rod and rails is s= 0.60.(a) What is the smallest vertical magnetic field B that would cause the rod toslide?(b) Suppose a B field is directed at some angle to the vertical , with the currentalong the rod directed into the page, as shown. Find an expression for B as afunction of for the case when the rod is just on the verge of beginning to slide.(c) Find the value of which yields the smallest value of B that would causethe rod to slide, together with the corresponding value of B.
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the pebble is 3.81 m from the center of the tornado and has a tangential speed equal to that of the surrounding wind: 124 m/s. what is the magnitude of the centripetal acceleration of the pebble? answers
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the wavelength of an electromagnetic wave is measured to be 600 m.(a)what is the frequency of the wave?(b)what type of em wave is it?
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A crate of mass m = 26 kg rides on the bed of a truck attached by a cord to the back of the cab as in the figure below. The cord can withstand a maximum tension of 69 N before breaking. Neglecting friction between the crate and truck bed, find the maximum acceleration the truck can have before the cord breaks. (Enter the magnitude of the maximum acceleration in the forward direction.) m/s2
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hich device involves the use of plasma in technology?arc welderdiesel enginea car radiobattery-operated flashlight
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an object is located in water 30 cm from the vertex of a convex surface made of plexiglas with a radius of curvature of 80 cm. where does the image form by refraction and what is its magnification? nwater
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engineers at the university of texas at austin are developing an advanced locomotive propulsion system that uses a gas turbine and perhaps the largest highspeed flywheel in the world in terms of the energy it can store. the flywheel can store 4.8 * 108 j of energy when operating at its maximum rotational speed of 15,000 rpm. at that rate, the perimeter of the rotor moves at approximately 1,000 m/s. determine the radius of the flywheel and its rotational inertia.
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Which factor has the least impact on the potential energy or kinetic energy of an object? Mass Speed Time Height from the ground
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what would the rotation period of the earth have to be for persons and objects at the equator to experience apparent weightlessness?
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when a student shines a 480 nm laser through this grating, how many bright spots could be seen on a screen behind the grating?
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a block of mass 5.0 kg is acted upon by a single force, producing an acceleration of 2.0 m/s2. the force has a value of
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a boat moves at 10.8 m/s relative to the water. if the boat is in a river where the current is 2.00 m/s, how long does it take the boat to make a complete round trip of 1 100 m upstream followed by a 1 100-m trip downstream?
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a galvanometer can be converted to an ammeter by the addition of a select one: a. large resistance in series. b. small resistance in parallel. c. small resistance in series. d. large resistance in parallel.
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the mass of the planet mars is only about 11% of the earth's mass. but the average density of mars is over 70% of the density of earth. the explanation for this is that
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how would the escape velocity of earth change if the earth suddenly became more dense and became 25 times more massive (but kept its size)?
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a force applied to an object of mass m1 produces an acceleration of 3.60 m/s2 . the same force applied to a second object of mass m2 produces an acceleration of 1.60 m/s2 . what is the value of the ratio m1/m2?
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the current supplied by a battery in a portable device is typically about 0.127 a. find the number of electrons passing through the device in two hours.
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the terminal velocity of an object depends primarily upon the terminal velocity of an object depends primarily upon its shape. its composition. its size. the temperature.
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a 60 kg dancer applies a horizontal force of -800 n on the dance floor. the dancer's acceleration will be
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mercury's average density is about 1.5 times greater than that of earth's moon, even though the two bodies have similar radii. what does this suggest about mercury's composition?
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a wire 0.50 m long carrying a current of 8.0 a is at right angles to a uniform magnetic field. the force on the wire is 0.40 n. what is the strength of the magnetic field?
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a free electron and free proton are released from rest in the same electric field.what is true for the electrical forces experienced by these two particle?
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a ball of mass 0.600 kg is carefully balanced on a shelf that is 2.10 m above the ground. what is its gravitational potential energy?
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A string is stretched to a length of 238 cm and both ends are fixed. If the density of the string is 0.014 g/cm, and its tension is 1610 N, what is the fundamental frequency? Answer in units of Hz.
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