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A 15 kg loudspeaker is suspended 2.5 m below the ceiling by two cables that are each 20 degrees from vertical. What is the tension in the cables?
After removing one string while restringing his acoustic guitar, a student is distracted by a video game. Find the frequency of the emf induced between the ends of the string.
A demented scientist creates a new temperature scale, the "Z scale. He decides to call the boiling point of nitrogen 0 and the melting point of steel 1000 . What is the boiling point of water on th
Assuming that ABC Firm has an optimal capital structure; comprised of debt, preferred stock and common equity. In this scenario, Firm currently has 45 percent debt, 2 percent preferred stock and 53
A 300 g block on a 56 cm -long string swings in a circle on a horizontal, frictionless table at 70 rpm. What is the speed of the block?
The vertical component of the Earth's magnetic field at this location has a magnitude of 48.0 µT. What is the magnitude of the induced emf between the ends of the beam?
A motorist is traveling at 18 m/s when he sees a deer in the road 38 m ahead. (a) If the maximum negative acceleration of the vehicle is -4.5 m⁄s^2 , what is the maximum reaction time ?t of t
When the magnetic field is increased uniformly from 200 µT to 600 µT in 0.400 s, an emf of magnitude 80.0 mV is induced in the coil. What is the total length of the wire?
A cannon tilted upward at 28 degrees fires a cannonball with a speed of 90 m/s calculate: Total time of travel before the cannon ball strikes the ground? Max height the cannon ball reaches? The ran
A 70.0 kg circus performer slides 4.90 m down a pole to the circus floor, starting from rest. What is the kinetic energy of the performer as she reaches the floor if the frictional force on her fro
An airplane is flying in a horizontal circle at a speed of 540 km/h. If the wings of the plane are tilted 33.0° to the horizontal, what is the radius of the circle in which the plane is flying?
The longest "string" (a thick metal wire) on a particular piano is 3.0 m long and has a tension of 300.0 N. It vibrates with a fundamental frequency of 27.5 Hz. What is the total mass of the wire?
A 4.00-kg model rocket is launched, expelling 57 g of burned fuel from its exhaust at a speed of 580 m/s. What is the velocity of the rocket after the fuel has burned?
A bug crawls outward from the center of a compact disc spinning at 180 revolutions per minute. The coefficient of static friction between the bug's sticky feet and the disc surface is 1.1. How far
On a dry road, a car with good tires may be able to brake with a constant deceleration of 4.28 m/s2. (a) How long does such a car, initially traveling at 23.4 m/s, take to stop? (b) How far does it
A motorcycle has a constant speed of 23.0 m/s as it passes over the top of a hill whose radius of curvature is 100 m. The mass of the motorcycle and driver is 346 kg. Find the magnitude of the norm
A monochromatic X-ray beam shows a first-order diffraction maximum when the grazing angle is 7.8°. Calculate the X-ray wavelength λ.
An inductor used in a dc power supply has an inductance of 13.0 H and a resistance of 230 Omega. It carries a current of 0.250 A.What is the energy stored in the magnetic field? At what rate is the
What mass (in grams) of steam at 100C must be mixed with 175 g of ice at its melting point, in a thermally insulated container, to produce liquid water at 50.0C?
What is the greatest distance at which these headlights can be resolved as separate points of light on a photograph taken with a camera whose aperture has a diameter of 11.5?
Julie drives 100 to Grandmother's house. On the way to Grandmother's, Julie drives half the distance at 25 and half the distance at 75 . On her return trip, she drives half the time at 25 and half
A 40.0 cm-diameter cylinder of helium gas is 50.0 cm long and at 30.0 ^circC. The pressure gauge reads 120 psi. How many helium atoms are in the cylinder?
If the 2 kg mass slides on a horizontal frictionless surface, what is the speed of the mass 4 kg when it has fallen a distance 0.4 m downward from its rest poisiton?
A golf ball strikes a hard, smooth floor at an angle of θ = 31.6° and, as the drawing shows, rebounds at the same angle. The mass of the ball is 0.043 kg, and its speed is 45 m/s just bef
How far (in km) and (b) in what direction (as an angle from due east, where north of east is a positive angle) must it now sail to reach its original destination?