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How far from a 51.4 mm focal-length lens must an object be placed if its image is to be magnified 2.50 and be real?
If you pass current through a standard coiled spring, what happens to the spring? Will it expand as if pulled, contract as if compressed, or remain in its given state?
What fraction of the power radiated by the sun is intercepted by the planet Mercury? The radius of Mercury is 2.44 x 106 m, and its distance from the sun at the moment is 5.80 x 1010 m. Assume that th
Assume the density of air is 1.29 kg/m3 and the density of helium is 0.179 kg/m3. Draw a force diagram for the balloon.
A 1.60 kg mass is attached to a light cord that is wrapped around a pulley of radius 6.80 cm, which turns with negligible friction. The mass falls at a constant acceleration of 2.25 m/s2. Find the m
A proton is released from rest in a uniform electric field of magnitude 385 N/C. Find (a) the electric force on the proton, (b) the acceleration of the proton, and (c) the distance it travels in
A 2.1 kg body oscillates in SHM on a spring that, when extended 2.3 mm from its equilibrium position, has an 10 N restoring force. What are (a) the angular frequency of oscillation, (b) the period o
What are (a) the angular frequency of oscillation, (b) the period of oscillation (in ms), and (c) the capacitance of an LC circuit with the same period if L is 7.5 H?
The block swings ina n arc, rising 8 mm above its lowest point. What is the kinetic energy of the bullet just before it hits the block?
The secondary voltage of an ignition transformer in a furnace is 14.5 kV. When the primary operates at an rms voltage of 100 V, the primary impedance is 23.3 O and the transformer is 91.9% efficient
If it is traveling north at 34 m/s through a magnetic field with vertical component of 30 µT, what magnitude emf is induced between the driver and passenger sides of the truck?
A 150 ohm combination of resistors draws 2 mA of current when connected across a battery. If you now add a 1 ohm resistor in series with this combination, there will be hardly any change in the curr
A wire has a current density of 17 A/mm2. If the drift velocity is 4.8×10-8 m/s, how many free electrons does the wire have in a 1.0 m length? The radius of the wire is 1.0 mm.
A wire 2.0mm in diameter and 4cmlong is connected to a 12V battery. If the resistivity of the wire is 3.5 x 10^-5 ohm-m; calculate the resistance of wire and its current?
An electron moving with a velocity of 2.7 x10^6 m/s in the positive x direction enters a region where there is a uniform 4.3 T magnetic eld at angle of 45 with the x-axis.
Suppose you have two positive point charges and want to move them closer together. To do the least amount of work, you should move them directly toward each other; any other path will require more w
What is the angular seperation between adjacent maxima? At what distance from the midline does the first minima fall on the screen?
Find the resulting change in length of this composite wire if an object with a mass of 5.00 kg is hung vertically from one of its ends.
Suppose a rocket ship in deep space moves with constant acceleration equal to 9.80 m/s2, which gives the illusion of normal gravity during the flight.
A uniform meter stick is in static rotational equilibrium when a mass of 220g is suspended from the 5.0-cm mark, a mass of 120g is suspended from the 90-cm mark, and the support stand is placed at t
A pot containing 1.07 liter of water, initially at 23°C, is placed on a 1071 W electric heating element. How much heat must be supplied to the water to bring it to a boil?
Eight 5 µC charges are located at the vertices of a unit cube centered about the origin with 1.0 mm edges. How much work does it take to bring a 2 µC charge from infinity to the origin?
A small bar magnet experiences a 2.1 x 10^-2N*m torque when the axs of the magnet is at 45 degree to a 6.00 *10^-2 T magnetic field. What is the magnitude of its magnetic dipole moment?
A 6.5-µF capacitor is connected in series with 4.2 MO resistor, and this combination is connected across an ideal 20-V DC battery. What is the current in the circuit when the capacitor has reac
Calculate the energy difference between the ("spin up") and ("spin down") levels of a hydrogen atom in the 1 state when it is placed in a 1.60 magnetic field in the negative z-direction.