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A 1.25 kg mass is suspended from a string which is pulled upward. The mass accelerates upwards with an acceleration of 3.50 m/s2. What is the tension in the string?
The mass of the rotor is 0.20 kg, the radii of the cylinder are 0.020 meter and 0.025 meter, and the radius of the shaft is 0.0020 meter. The angular momentum of the shaft and spokes is negligible.
Determine the current in the wire. (b) If the wire is heated to 30.0°C while the 9.0-V potential difference is maintained, what is the resulting current in the wire.
At one time, television sets used "rabbit-ears" antennas. Such an antenna consists of a pair of metal rods. The length of each rod can be adjusted to be one-quarter of a wavelength of an electromagn
A compact disk (CD) recording system samples each of two stereo signals with a 16-bit analog-to-digital converter. Determine the output signal-to-quantizing ratio for a full-scale sinusoid.
A 23 kg piece of zinc at 71 degrees Celsius is placed in a container of water. The water has a mass of 36 kg and has a temperature of 21 degrees Celsius before the zinc is added. What is the final t
A 5.20 kg block hangs from a spring with spring constant 2100 N/m. The block is pulled down 5.30 cm from the equilibrium position and given an initial velocity of 1.60m/s back toward equilibrium. W
The angle of elevation of the sun is 28'20' degrees and the shadow of a flagpole on horizontal ground is 29.48 cm. How tall is the flagpole?
A 0.105-kg hockey puck moving at 22 m/s is caught and held by a 73-kg goalie at rest. With what speed does the goalie slide on the ice?
Suppose that after a centrifuge in a medical laboratory is turned off, it continues to rotate with a constant angular deceleration for 10.4 s before coming to rest. How many revolutions did the cen
Identify the orientation of the needle that represent the minimum potential energy. Identify the orientation of the needle that represent the maximum potential energy of the needle-field system.
Speedboat A negotiates a curve whose radius is 124 m. Speedboat B negotiates a curve whose radius is 230 m. Each boat experiences the same centripetal acceleration. What is the ratio vA/vB of the s
Water flows into a swimming pool at the rate of 8.0 gal/min. The pool is 16 ft wide, 32 ft long and 8.0 ft deep. How long does it take to fill? (1 U.S. gallon = 231 cubic inches)
A Toyota Prius driving north at 59.0 {rm mph} and a VW Passat driving south at 41.0 {rm mph} are on the same road heading toward each other (but in different lanes). (We take the positive direction
a place kicker must kick a football from a point 33.0m from the goal. As a result of the kick, the ball must clear the crossbar which is 3.05m high. When kicked the ball leaves the ground with a spe
A 4.0 kg block is released from rest 2.0m high at the top of a 30 degree frictionless incline. The block makes a head-on elastic collision with another 3.0 kg block intially at rest on a horizontal
The study of personality is concerned mainly with
Both masses start from rest at point A in the position shown; point B is just as m2 hits the floor. The total mechanical energyin the system is 13.1. what is the kinetic energy of the system at poin
A 41 kg crate, starting from rest, is pulled across a floor with a constant horizontal force of 250 N. For the first 10 m the floor is frictionless, and for the next 11 m the coefficient of frictio
A force of 15.0N is applied to an object of mass 5.0kg. It accelerates at 2.5m/s^2. Determine the force of friction that is acting on object.
An object of mass 95.0kg rests on the surfacee of a planet with a mass of 3.5 x 10^15kg and a radius of 7.8 x 10^8m. Calculate the foce of gravity acting on the object on the surface of the plant
A 3.0 kg block is attached to a string that is wrapped around a 2.0 kg, 4.0-cm-diameter hollow cylinder that is free to rotate. The block is released 1.0 m above the ground. Use Newton's second law
Two identical objects are placed in a room at 20. Object 1 has a temperature of 91 and object 2 has a temperature of 26. What is the ratio of the net power emitted by object 1 to that radiated by ob
The thickness of the probe in the direction of B is 1.60 mm. Find the density of the charge carriers, each of which has charge of magnitude e).
A 4-kg ball traveling to the right with a speed of 4 m/s collides with a 5-kg ball traveling to the left with a speed of 2 m/s. What is the total momentum of the two balls after they collide?