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A wire of length L and resistance R is cut in half, and the two halves are connected in parallel. What is the resistance of the parallel combination?
A 12-V car battery is rated at 120 Ah. Assuming that the terminal voltage remains 12 V, for how long can this battery supply power at 29 W? How much charge flows through this battery in this time? H
If the field is always perpendicular to the proton's velocity, what is the field's magnitude if exiting protons have a kinetic energy of 12 ?
Take the mass of the sun to be = 1.99×1030 , the gravitational constant to be = 6.67×10-11 , and the acceleration due to gravity at the earth's surface to be = 9.810
A man in a maze makes three consecutive displacements. His first displacement is 5.50 m westward, and the second is 21.0 m northward. At the end of his third displacement he is back to where he star
Imagine that you are observing a spacecraft moving in a circular orbit of radius 500000 around a distant planet. You happen to be located in the plane of the spacecraft's orbit. You find that the sp
12.0 N force with a fixed orientation does work on a particle as the particle moves through displacement d= (2.00i - 4.00j + 3.00k) m. What is the angle between the force and the displacement if the
During the first putt, the ball rolls 5.8 m due east. For the second putt, the ball travels 1.7 m at an angle 20° north of east. The third putt is 0.50 m due north. What displacement (magnitude
The distance between two telephone poles is d = 53.5 m. When a 0.550-kg bird lands on the telephone wire midway between the poles, the wire sags h = 0.195 m. (a) How much tension does the bird produ
How long would it take an identical panel that is also oriented perpendicular to the incoming radiation to absorb the same amount of energy, if it were on an interplanetary exploration vehicle 1.75
The reflected wave, when combined with the outgoing wave, produces beats at a rate of 1432 s-1. How fast is the speeder going?
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 7.0 and t
A student makes a simple generator by using a single square loop 10 cm on each side. The loop is then rotated at a frequency of 60 Hz in a magnetic field of 0.015 T. (a) What is the maximum emf outp
A square loop of wire with sides of length 40 cm experiences a uniform magnetic field perpendicular to its area. (a) If the field's strength is initially 100 mT and it decays to zero in 0.010 s, wha
In moving a 38.0 desk from one side of a classroom to the other, a professor finds that a horizontal force of 285 is necessary to set the desk in motion, and a force of 190 is necessary to keep it i
The velocity of propagation of a transverse wave on a 2-m long fixed at both ends is 200 m/s. Which one of the following is not a resonant frequency of this string?
A mass attached to the free end of an ideal spring excutes SHM according to the equation x = 0.5 Sin 20t where x is in meters and t is in seconds. What is the magnitude of maximum acceleration for t
What is the smallest amount of work that must be done on the electron to move it from its circular orbit, with a radius of , to an infinite distance from the proton? This value is referred to as the
A wire carries a current of 10 A in the +x direction in a uniform magnetic field of 0.40 T. Find the magnitude of the force per unit length and the direction of the force on the wire if the magneti
(a) Find an expression for the position of the particle as a function of time. (Use the following as necessary: t, and p.) (b) Determine the maximum speed of the particle.
We define its position as x = 0. The object is pulled down an additional 16.5 cm and released from rest to oscillate without friction. What is its position x at a moment 84.4 s later? (b) Find the
A wood block, after being given a starting push, slides down a wood ramp at a constant speed. What is the angle of the ramp above horizontal? Also wood -on-wook kinetic friction coefficient µk=
An airplane propeller is 2.20 in length (from tip to tip) with mass 124 and is rotating at 2300 () about an axis through its center. You can model the propeller as a slender rod. What is its rotatio
A charge of 0.050 C moves vertically in a field of 0.080 T that is oriented 45° from the vertical. What speed must the charge have such that the force acting on it is 10 N? Please show work.
When a current of I = 41 A exists in the wire, the wire swings upward and, at equilibrium, makes an angle φ with respect to the vertical, as the drawing shows. Find (a) the angle and (b) the ten