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A heart pacemaker is designed to operate at 72 beats per minute using a 7.5*10^-6 F capacitor in a smiple RC circut. what value of resistance should be used if the pacemaker is to fire (capacitor di
An electron is released from rest at a distance of 9 cm from a proton. How fast will the electron be moving when it is 3 cm from the proton?
Consider a rectangular loop of wire 6.9 cm by 8.0 cm in a uniform magnetic field of magnitude 2.0 T. The loop is rotated from a position of zero magnetic flux to a position of maximum flux in 17 ms
What is the deflection caused by the vertical component of the Earth's magnetic field or strength 4 × 10^-5 T, assuming that any change in the horizontal component of the beam velocity is negl
A 25-Ω resistance is connected in series with a 30-mH inductance and a 12-µF capacitor and are connected to a 90-V (rms) ac. If the frequency of the ac source is 500 Hz, calculate: (i) t
When the coil of a motor is rotating at maximum speed, the current in the windings is 9.0 A. When the motor is first turned on, the current in the windings is 16 A.
A capacitor when fully charged holds 5.0 J of energy. When it is connected across a 10-kΩ resistor, 2.0 J of energy is dissipated in 8.5 ms. What is the capacitance of the capacitor?
A 2.20m high rectangular door is closed by a force of 200.0N acting through the door knob. The door knob is at a perpendicular distance of 80.0cm from the hinged edge of the door and 1.1m from the b
A 70.0kg diver stands on the free end of a diving board that is in equilibrium. The length of the diving board is 3.50m. The fixed end of the diving board is 1.50m from the fulcrum. Determine the ma
Two identical diverging lenses are separated by 17 cm. The focal length of each lens is -8.0 cm. An object is located 4.0 cm to the left of the lens that is on the left. Determine the final image di
A NASA satellite has just observed an asteroid that is on a collision course with the Earth. The asteroid has an estimated mass, based on its size, of 5 X 10^9kg. It is approaching the Earth on a he
What is the torque produced about the fulcrum by a 100.0kg mass resting on a see-saw of length 2.00m at a distance of 0.500m from the center of mass? The mass of the see-saw is 25.0kg and the center
An object is placed in front of a converging lens in such a position that the lens (f = 14.0 cm) creates a real image located 24.0 cm from the lens. Then, with the object remaining in place, the len
A meter stick is suspended at its center of gravity by a cord. If a mass is hung on the right side of the meter stick, what quantities are needed to determine the torque on the meter stick? Would th
A meter stick is 1.000m in length. The meter stick is attached to a fulcrum at the 0.500m position on the meter stick. if a mass is placed at the 0.350m position on the meter stick, how far away is
Roller coasters work on principle of conservation of mechanical energy (with allowances for energy losses to friction, heat, sound). Using what you know about conservation of energy, explain how a r
What is the subsequent speed of the boat? (Consider the speed of the water in the bucket given above to be measured with respect to the initial speed of the boat.)
A 55 kg woman on a 425 kg boat hooks a 150 kg fish on the end of a nearly horizontal line 38 m long. If fish and boat are originally at rest on a frictionless sea, how far does the boat move as she
A solenoid has n turns per unit length and carries a current I = I0 sin(ωt). For small frequencies, find the displacement current and the electric and magnetic fields everywhere. The radius of
A 900 kg airplane touches down on an icy runway, heading northward at 150 km/h. It collides with a 1600 kg plane taxiing eastward at 100 km/h. Find the speed and direction of the combined wreckage.
The electrodes are in the shape of circular discs and the distance between them is d. If a voltage V = V0 cos(ωt) is applied find the magnetic field at a distance r from the axis. Ignore edge
(a) What is the velocity of the wedge after the block reaches the horizontal surface? (b) What is the height of the wedge?
In a Broadway performance, and 80.0 kg actor swings from a 3.75 m long cable that is horizontal when he starts. At the bottom of his arc, he picks up his 55.0 kg costar in an inelastic collision. Wh
Two ice skaters are holding hands at the center of a frozen pond when an argument ensues. Skater A shoves skater B along a horizontal direction. Identify (a) the horizontal forces acting on A and (b