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At a distance of 3.7 m from a siren, the sound intensity is 2.80 10-2 W/m2. Assuming that the siren radiates sound uniformly in all directions, find the total power radiated.
A sled weighs 10 kg. It is held in place on a frictionless 20 degrees slope by a rope attached to a stake at the top, the rope is parallel to the slope. Find the tension in the rope?
To keep a room at a comfortable 21.0°C a Carnot heat pump does 345 J of work and supplies it with 3240 J of heat.
If the electron follows a circular path with a radius of 16 cm, what is the magnitude of the magnetic field?
Imagine a frictionless pulley (a solid cylinder) of unknown mass M and radius r = 0.200 m which is used to draw water from a well. A bucket of mass m = 1.50 kg is attached to a massless cord wrapped
A 5.00uF capacitor is initially charged to a potential of 16.0V. It is then connected in series with a 3.75 mH inductor. What is the total energy stored in this circuit?
An airplane needs to reach a velocity of 203 km/h to take off. On a 2000 m runway, what is the minimum acceleration necessary for the plane to take flight?
A car of mass M = 1200 kg traveling at 45.0 km/hour enters a banked turn covered with ice. The road is banked at an angle theta, and there is no friction between the road and the car's tires.
A pitcher throws a curveball that reaches the catcher in 0.63 s. The ball curves because it is spinning at an average angular velocity of 270 rev/min (assumed constant) on its way to the catcher's
A bullet is fired straight up from a gun with a muzzle velocity of 133 m/s. Neglecting air resistance, what will be itsdisplacement after 3.8 s? The acceleration of gravity is 9.8 m/s2.
Describe thinking, intelligence, and creativity in your own words. How are thinking, intelligence, and creativity related?
A ball rolls horizontally off the edge of a tabletop that is 1.05 m high. It strikes the floor 2.80 m away from the edge of the table. What is the initial (horizontal) velocity of the ball? Ignore a
What resistive force (assumed to be constant) does the wood exert on the bullet? How long does it take the bullet to come to rest?
The Sun is a low mass star and so will never have the core fusion reactions of massive stars. Yet, the Sun has iron in its atmosphere, as well as gold, silver and other elements much heavier than i
The balances read 385 and 115 as shown. Both are 20 cm from each end of the meterstick. Assume the meterstick has zweo mass and use torques to calculate the position of the 500g weight on the stick
A 10.80 cm diameter wire coil is initially oriented so that its plane is perpendicular to a magnetic field of 0.680 T pointing up. During the course of 0.160 s, the field is changed to one of 0.250
A proud deep-sea fisherman hangs a fish of mass m from an ideal spring having negligible mass. What is the period of oscillation of the fish if it is pulled down and released?
When it flows perpendicularly with respect to a magnetic field, as in the drawing, electrodes can be used to measure the small voltage that develops accross the vessel. Suppose the speed of the bloo
An inverted image of an object is viewed on a screen from the side facing a converging lens. An opaque card is then introduced covering only the upper half of the lens. What happens to the image on
The dielectric plate is now slowly pulled out of the capacitor, which remains connected to the battery. Find the energy of the capacitor at the moment when the capacitor is half-filled with the diel
A charge of +3.5 microC is placed on the x axis at x = +0.55 m, while a charge of -15 microC is placed at the origin. Calculate the magnitude and direction of the net electric field on the x-axis at
Traveling at an initial speed of 1.5x10^6 m/s a proton enters a region of constant magnetic field of magnitude 1.5 T. If it protons initial velocity vector makes an angle of 30 degrees with the mag
A 1.20 102 g sample of water at 90.0°C is mixed with 1.20 102 g of water at 10.0°C. Assume no heat loss to the surroundings. What is the final temperature of the mixture?
A double slit is illuminated with monochromatic light of wavelenght 6.00 X 10^-2 nm. The m=0 and m=1 bright fringes are separated by 3.0 cm on a screen which is located 4.0 m from the slits. What is
An object has a kinetic energy of 303 J and a momentum of magnitude 22.9 kg·m/s. Find the speed and the mass of the object.