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In this case, the ski boat is traveling at 15.3 m/s and the tension in the rope is 76.5 N. If the boat does 3390 J of work on the skier in 51.0 m, what is the angle between the tow rope and the cent
The other half is supported by the vertical forces of the ground on his feet. Assuming the person is moving with constant velocity and the force exerted by the ground on the crutches acts along the
In an Atwood machine m1= 2 kg and m2= 7 kg. The masses of the pulley and string are negligible by comparison. The pulley turns without friction and the string does not stretch. The lighter object is
The maximum torque experienced by a coil in a 0.50 T magnetic field is 8.4 x 10-4 N · m. The coil is circular and consists of only one turn. The current in the coil is 3.1 A. What is the lengt
A singly charged positive ion has a mass of 2.50*10^-26 kg. After being accelerated through a potential difference of 250V, the ion enters a magnetic field of 0.500 T, in a direction perpendicular t
The "power cube" transformer for a portable CD player has an output of 4.6V and 600mA (both rms) when plugged into a 120V/60Hz outlet. If the primary coil has 1250 turns of wire, how many turns are
The string on side B is retied and now has only half the length of the string on side A. Find the magnitude of the initial acceleration of the end B when the string is cut.
A wheel of diameter 38.0 cm is constrained to rotate in the xy plane, about the z axis, which passes through its center. A force = (-30.0 + 40.0 ) N acts at a point on the edge of the wheel that lie
If you have a bar 42 cm long and pinned (an axis) at one end, and you have to exert a force of 9.7 N upward in the middle to keep it in equilibrium, what is the necessary mass hanging on the far end
What are the magnitude and direction of the electric field 12.5 cm directly above an isolated 38.5 10-6 C charge?
A 0.460- block is attached to a horizontal spring that is at its equilibrium length, and whose force constant is 21.0 . The block rests on a frictionless surface. A 5.90×10-2- wad of putty is
The suspension (four springs) of a mass 2,958 kg car sags a distance of 27.6cm when the entire weight of the car is placed on it The effective amplitude decays to 55.5% of its initial value in 3 osc
An amusement park ride consists of a large vertical cylinder that spins about its axis fast enough such that any person inside is held up against the wall whenthe floor drops away. The coefficient o
A television set draws an rms current of 2.75 A from a 60-Hz power line. (a) What is the average current? (b) What is the average of the square of the current?
If the resistivity of a wire is measured to be 2.91 x 10-8 Ωm at a temp. of 20 degrees Celsius and the temp coefficient of resistivity is 0.0057 1/C, (a.) What would be the resistivity of the wi
A very long wire carrying a conventional current of 3.9 amperes is straight except for a circular loop of radius 5.8 cm. Calculate the approximate magnitude and the direction of the magnetic field a
A 0.405-µF capacitor is connected across the terminals of a variable frequency oscillator. (a) What is the frequency when the reactance is 5.88 kO?
If you removed the original magnet, and replaced it with a magnet made of the same material, but with a mass of 30 g (magnet B), approximately what would be the magnetic field at a location 0.18 m f
If 70g of a substance at 84 degrees celsius is dropped into a container with 100 g of water at 13 degrees C, what is the specific heat capacity of the substance if the temperature of the water incre
During an aerobics class, a person gives off 1200 kJ of heat energy in 45 minutes. Assuming all this energy is used to evaporate water from the skin, how much water is lost? The latent heat of evapo
If the charge is moving at a speed of 3.7 x 104 m/s perpendicular to the magnetic field of the electromagnetic wave, find the magnitudes of the (c) electric and (d) magnetic forces exerted on the p
A source moving with a speed 34 m/s, emits a sound wave with a frequency f = 351 Hz. Determine the frequency detected by a stationary observer if the speed of sound is v = 334 m/s and the source is
A variable capacitor with negligible resistance is connected to an ac voltage source. By what factor does the current in the circuit increase if the capacitance is increased by a factor of 6.0 and t
A 12-V car battery is rated at 120 A h. Assuming that the terminal voltage remains 12 V, for how long can this battery supply power at 29 W? How much charge flows through the battery in this time? H
Suppose 200g of a substance at 90 degrees celsius is dropped into a container with 100g of water at 15 degrees celsius. What is the specific heat capacity of the substance if the temperature of the